**JavaWeb 综合案例 **
黑马程序员视频链接: 01-综合案例-环境搭建_哔哩哔哩_bilibili
1.功能介绍
- 用户登录（账号密码登录）
- 用户注册（新用户注册账号）
- 查询所有（查询所有品牌数据）
- 新增品牌（增加新的品牌数据）
- 修改品牌（修改品牌数据）
- 删除品牌（删除品牌数据）
- 批量删除（删除多条品牌数据）
- 分页查询（分页展示品牌数据）
- 条件查询（通过条件精确查询品牌数据)
所用技术及工具：Mybatis+Maven+Filter+Ajax+JSON+JavaScript+HTML+CSS+Element+VUE
2.工程准备
注：该项目的Tomcat启动地址应设为下图所示：
**Maven配置： **
2.1pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.example</groupId>
<artifactId>brand-case</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>war</packaging>
<properties>
<maven.compiler.source>8</maven.compiler.source>
<maven.compiler.target>8</maven.compiler.target>
</properties>
<dependencies>
<!--Servlet-->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<scope>provided</scope>
</dependency>
<!--MyBatis-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.5</version>
</dependency>
<!--MySQL-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.34</version>
</dependency>
<!--fastjson-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.62</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.tomcat.maven</groupId>
<artifactId>tomcat7-maven-plugin</artifactId>
<version>2.2</version>
</plugin>
</plugins>
</build>
</project>
**Mybatis配置： **
2.2mybatis-config.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<typeAliases>
<package name="com.pojo"/>
</typeAliases>
<environments default="development">
<environment id="development">
<transactionManager type="JDBC"/>
<dataSource type="POOLED">
<property name="driver" value="com.mysql.jdbc.Driver"/>
<!-- 连接数据库-->
<property name="url" value="jdbc:mysql://localhost:13306/db1"/>
<property name="username" value="root"/>
<property name="password" value="1234"/>
</dataSource>
</environment>
</environments>
<mappers>
<!--扫描mapper-->
<package name="com.mapper"/>
</mappers>
</configuration>
2.3SqlSessionFactoryUtils
package com.util;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import java.io.IOException;
import java.io.InputStream;
//通过mybatis操作数据库的工具类，里面封装了对数据库的操作
//只能使用一次，一旦创建后可以重复使用
public class SqlSessionFactoryUtils {
private static SqlSessionFactory sqlSessionFactory;
static {
//静态代码块会随着类的加载而自动执行，且只执行一次
try {
String resource = "mybatis-config.xml";
InputStream inputStream = Resources.getResourceAsStream(resource);
sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
} catch (IOException e) {
e.printStackTrace();
}
}
public static SqlSessionFactory getSqlSessionFactory(){
return sqlSessionFactory;
}
}
**验证码生成工具类： **
2.4CheckCodeUtil
package com.util;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.io.*;
import java.util.Arrays;
import java.util.Random;
/**
* 生成验证码工具类
*/
public class CheckCodeUtil {
public static final String VERIFY_CODES = "123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
private static Random random = new Random();
public static void main(String[] args) throws Exception {
//调用主方法，在D盘产生名为a的验证码图片，并在服务端打印验证码内容
OutputStream fos=new FileOutputStream("d://a.jpg");
String s = CheckCodeUtil.outputVerifyImage(100, 50, fos, 4);
System.out.println(s);
//此为CheckCodeServlet写入，在jsp中可直接调用
// 如：“<img id="checkCodeImg" src="/brand-demo/CheckCodeServlet">”
//ServletOutputStream os = response.getOutputStream();
//String s = CheckCodeUtil.outputVerifyImage(100, 50, os, 4);
}
/**
* 输出随机验证码图片流,并返回验证码值（一般传入输出流，响应response页面端，Web项目用的较多）
*
* @param width 图片宽度
* @param height 图片高度
* @param os 输出流
* @param verifySize 数据长度
* @return 验证码数据
* @throws IOException
*/
public static String outputVerifyImage(int width, int height, OutputStream os, int verifySize) throws IOException {
String verifyCode = generateVerifyCode(verifySize);
outputImage(width, height, os, verifyCode);
return verifyCode;
}
/**
* 使用系统默认字符源生成验证码
*
* @param verifySize 验证码长度
* @return
*/
public static String generateVerifyCode(int verifySize) {
return generateVerifyCode(verifySize, VERIFY_CODES);
}
/**
* 使用指定源生成验证码
*
* @param verifySize 验证码长度
* @param sources 验证码字符源
* @return
*/
public static String generateVerifyCode(int verifySize, String sources) {
// 未设定展示源的字码，赋默认值大写字母+数字
if (sources == null || sources.length() == 0) {
sources = VERIFY_CODES;
}
int codesLen = sources.length();
Random rand = new Random(System.currentTimeMillis());
StringBuilder verifyCode = new StringBuilder(verifySize);
for (int i = 0; i < verifySize; i++) {
verifyCode.append(sources.charAt(rand.nextInt(codesLen - 1)));
}
return verifyCode.toString();
}
/**
* 生成随机验证码文件,并返回验证码值 (生成图片形式，用的较少)
*
* @param w
* @param h
* @param outputFile
* @param verifySize
* @return
* @throws IOException
*/
public static String outputVerifyImage(int w, int h, File outputFile, int verifySize) throws IOException {
String verifyCode = generateVerifyCode(verifySize);
outputImage(w, h, outputFile, verifyCode);
return verifyCode;
}
/**
* 生成指定验证码图像文件
*
* @param w
* @param h
* @param outputFile
* @param code
* @throws IOException
*/
public static void outputImage(int w, int h, File outputFile, String code) throws IOException {
if (outputFile == null) {
return;
}
File dir = outputFile.getParentFile();
//文件不存在
if (!dir.exists()) {
//创建
dir.mkdirs();
}
try {
outputFile.createNewFile();
FileOutputStream fos = new FileOutputStream(outputFile);
outputImage(w, h, fos, code);
fos.close();
} catch (IOException e) {
throw e;
}
}
/**
* 输出指定验证码图片流
*
* @param w
* @param h
* @param os
* @param code
* @throws IOException
*/
public static void outputImage(int w, int h, OutputStream os, String code) throws IOException {
int verifySize = code.length();
BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
Random rand = new Random();
Graphics2D g2 = image.createGraphics();
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
// 创建颜色集合，使用java.awt包下的类
Color[] colors = new Color[5];
Color[] colorSpaces = new Color[]{Color.WHITE, Color.CYAN,
Color.GRAY, Color.LIGHT_GRAY, Color.MAGENTA, Color.ORANGE,
Color.PINK, Color.YELLOW};
float[] fractions = new float[colors.length];
for (int i = 0; i < colors.length; i++) {
colors[i] = colorSpaces[rand.nextInt(colorSpaces.length)];
fractions[i] = rand.nextFloat();
}
Arrays.sort(fractions);
// 设置边框色
g2.setColor(Color.GRAY);
g2.fillRect(0, 0, w, h);
Color c = getRandColor(200, 250);
// 设置背景色
g2.setColor(c);
g2.fillRect(0, 2, w, h - 4);
// 绘制干扰线
Random random = new Random();
// 设置线条的颜色
g2.setColor(getRandColor(160, 200));
for (int i = 0; i < 20; i++) {
int x = random.nextInt(w - 1);
int y = random.nextInt(h - 1);
int xl = random.nextInt(6) + 1;
int yl = random.nextInt(12) + 1;
g2.drawLine(x, y, x + xl + 40, y + yl + 20);
}
// 添加噪点
// 噪声率
float yawpRate = 0.05f;
int area = (int) (yawpRate * w * h);
for (int i = 0; i < area; i++) {
int x = random.nextInt(w);
int y = random.nextInt(h);
// 获取随机颜色
int rgb = getRandomIntColor();
image.setRGB(x, y, rgb);
}
// 添加图片扭曲
shear(g2, w, h, c);
g2.setColor(getRandColor(100, 160));
int fontSize = h - 4;
Font font = new Font("Algerian", Font.ITALIC, fontSize);
g2.setFont(font);
char[] chars = code.toCharArray();
for (int i = 0; i < verifySize; i++) {
AffineTransform affine = new AffineTransform();
affine.setToRotation(Math.PI / 4 * rand.nextDouble() * (rand.nextBoolean() ? 1 : -1), (w / verifySize) * i + fontSize / 2, h / 2);
g2.setTransform(affine);
g2.drawChars(chars, i, 1, ((w - 10) / verifySize) * i + 5, h / 2 + fontSize / 2 - 10);
}
g2.dispose();
ImageIO.write(image, "jpg", os);
}
/**
* 随机颜色
*
* @param fc
* @param bc
* @return
*/
private static Color getRandColor(int fc, int bc) {
if (fc > 255) {
fc = 255;
}
if (bc > 255) {
bc = 255;
}
int r = fc + random.nextInt(bc - fc);
int g = fc + random.nextInt(bc - fc);
int b = fc + random.nextInt(bc - fc);
return new Color(r, g, b);
}
private static int getRandomIntColor() {
int[] rgb = getRandomRgb();
int color = 0;
for (int c : rgb) {
color = color << 8;
color = color | c;
}
return color;
}
private static int[] getRandomRgb() {
int[] rgb = new int[3];
for (int i = 0; i < 3; i++) {
rgb[i] = random.nextInt(255);
}
return rgb;
}
private static void shear(Graphics g, int w1, int h1, Color color) {
shearX(g, w1, h1, color);
shearY(g, w1, h1, color);
}
private static void shearX(Graphics g, int w1, int h1, Color color) {
int period = random.nextInt(2);
boolean borderGap = true;
int frames = 1;
int phase = random.nextInt(2);
for (int i = 0; i < h1; i++) {
double d = (double) (period >> 1)
* Math.sin((double) i / (double) period
+ (6.2831853071795862D * (double) phase)
/ (double) frames);
g.copyArea(0, i, w1, 1, (int) d, 0);
if (borderGap) {
g.setColor(color);
g.drawLine((int) d, i, 0, i);
g.drawLine((int) d + w1, i, w1, i);
}
}
}
private static void shearY(Graphics g, int w1, int h1, Color color) {
int period = random.nextInt(40) + 10; // 50;
boolean borderGap = true;
int frames = 20;
int phase = 7;
for (int i = 0; i < w1; i++) {
double d = (double) (period >> 1)
* Math.sin((double) i / (double) period
+ (6.2831853071795862D * (double) phase)
/ (double) frames);
g.copyArea(i, 0, 1, h1, 0, (int) d);
if (borderGap) {
g.setColor(color);
g.drawLine(i, (int) d, i, 0);
g.drawLine(i, (int) d + h1, i, h1);
}
}
}
}
3.注册页面
3.1User
package com.pojo;
public class User {
private Integer id;
private String username;
private String password;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
@Override
public String toString() {
return "User{" +
"id=" + id +
", username='" + username + '\'' +
", password='" + password + '\'' +
'}';
}
}
3.2UserMapper.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.mapper.UserMapper">
</mapper>
3.3UserMapper
package com.mapper;
import com.pojo.User;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;
public interface UserMapper {
/**
* 根据用户名和密码查询用户对象
* @param username
* @param password
* @return
*/
@Select("select * from tb_user where username = #{username} and password = #{password}")
User select(@Param("username") String username, @Param("password") String password);
/**
* 根据用户名查询用户对象
* @param username
* @return
*/
@Select("select * from tb_user where username = #{username}")
User selectByUsername(String username);
/**
* 添加用户
* @param user
*/
@Insert("insert into tb_user values(null,#{username},#{password})")
void add(User user);
}
3.4UserService
package com.service;
import com.mapper.UserMapper;
import com.pojo.User;
import com.util.SqlSessionFactoryUtils;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
public class UserService {
SqlSessionFactory factory = SqlSessionFactoryUtils.getSqlSessionFactory();
/**
* 登录方法
* @param username
* @param password
* @return
*/
public User login(String username, String password) {
// 2.获取SqlSession
SqlSession sqlSession = factory.openSession();
// 3.获取UserMapper
UserMapper mapper = sqlSession.getMapper(UserMapper.class);
User user = mapper.select(username, password);
// 释放资源
sqlSession.close();
return user;
}
/**
* 注册方法
* @param user
* @return
*/
public boolean register(User user) {
// 2.获取SqlSession
SqlSession sqlSession = factory.openSession();
// 3.获取UserMapper
UserMapper mapper = sqlSession.getMapper(UserMapper.class);
// 4.判断用户名是否存在
User u = mapper.selectByUsername(user.getUsername());
if(u == null){
// 用户名不存在
mapper.add(user);
// 提交事务
sqlSession.commit();
}
sqlSession.close();
return u == null;
}
}
3.5register.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>欢迎注册</title>
<link href="css/register.css" rel="stylesheet">
<script src="js/vue.js"></script>
<script src="js/axios-0.18.0.js"></script>
</head>
<body>
<div id="app">
<div class="form-div">
<div class="reg-content">
<h1>欢迎注册</h1>
<span>已有帐号？</span> <a href="login.html">登录</a>
</div>
<form id="reg-form" action="#" method="get">
<table>
<tr>
<td>用户名</td>
<td class="inputs">
<input v-model="username" type="text" id="username" >
<br>
<span id="username_err" class="err_msg" ref="unerr" style="display: none">用户名已被注册</span>
</td>
</tr>
<tr>
<td>密码</td>
<td class="inputs">
<input v-model="password" type="password" id="password">
<br>
<span id="password_err" class="err_msg" style="display: none">密码格式有误</span>
</td>
</tr>
<tr>
<td>验证码</td>
<td class="inputs">
<input v-model="checkCode" type="text" id="checkCode">
<img :src="url" id="checkCodeImg">
<a @click="switchPic" id="changeImg">看不清？</a>
<br>
<span class="err_msg">{{message}}</span>
</td>
</tr>
</table>
<div class="buttons">
<input value="注 册" type="button" id="reg_btn" @click="submit">
</div>
<br class="clear">
</form>
</div>
</div>
<script>
new Vue({
el: "#app",
data: {
username:'',
password:'',
message:'',
checkCode:'',
url:''
},
mounted(){
this.url = "http://localhost:8080/brand-case/checkCodeServlet"
},
methods:{
switchPic(){
//如果网址一样，浏览器可能会有缓存导致验证码换不了，增加时间函数，每次网址唯一
this.url = "http://localhost:8080/brand-case/checkCodeServlet?"+new Date().getMilliseconds()
},
submit(){
if(!this.username.trim()){
this.message = "账号不能为空"
return
}
if(!this.password.trim()){
this.message = "密码不能为空"
return
}
axios.get("http://localhost:8080/brand-case/registerServlet?username=" + this.username + "&password=" + this.password+ "&checkCode=" + this.checkCode).then((res)=>{
//console.log(res)
if(res.data==="success"){
location.href = 'http://localhost:8080/brand-case/login.html'
}else if(res.data === 1){
this.message = "验证码错误"
/*
在vue2中，我们可以直接使用ref获取元素，也就是直接在元素上绑定ref属性，
在直接使用this.$refs[‘自定义属性名’] 就能直接获取。
*/
this.$refs.unerr.style.display = 'none'
}else {
this.$refs.unerr.style.display = ''
this.message = ""
}
})
}
}
})
</script>
<script>
//点击图片更换验证码
document.getElementById("checkCodeImg").onclick=function (){
//如果src地址与上次相同，验证码会缓存，为保证每次不一样，src后加?和时间
document.getElementById("checkCodeImg").src="http://localhost:8080/brand-case/checkCodeServlet?"+new Date().getMilliseconds();
}
</script>
</body>
</html>
3.6RegisterServlet
package com.web.servlet;
import com.pojo.User;
import com.service.UserService;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
@WebServlet("/registerServlet")
public class RegisterServlet extends HttpServlet {
/**
* 注册验证
*/
private UserService service = new UserService();
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// 1.获取用户名和密码数据
String username = request.getParameter("username");
String password = request.getParameter("password");
User user = new User();
user.setUsername(username);
user.setPassword(password);
// 获取用户输入验证码
String checkCode = request.getParameter("checkCode");
// 程序生成的验证码
HttpSession session = request.getSession();
String checkCodeGen = (String) session.getAttribute("checkCodeGen");
// 比对
if(!checkCodeGen.equalsIgnoreCase(checkCode)){
response.getWriter().write("1");
// 不允许注册
return;
}
// 2.调用service 注册
boolean flag = service.register(user);
// 3.判断注册成功与否
if(flag){
// 注册成功 跳转登陆页面
response.getWriter().write("success");
}else {
// 注册失败 跳转到注册页面
response.getWriter().write("error");
}
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doGet(request, response);
}
}
3.7CheckCodeServlet
package com.web.servlet;
import com.util.CheckCodeUtil;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
@WebServlet("/checkCodeServlet")
public class CheckCodeServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
HttpSession session = request.getSession();
// 生成验证码
ServletOutputStream os = response.getOutputStream();
String checkCode = CheckCodeUtil.outputVerifyImage(100, 50, os, 4);
// 存入Session
session.setAttribute("checkCodeGen",checkCode);
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doGet(request, response);
}
}
4.登录页面
4.1login.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>login</title>
<link href="css/login.css" rel="stylesheet">
<script src="js/vue.js"></script>
<script src="js/axios-0.18.0.js"></script>
</head>
<body>
<div id="app">
<div id="loginDiv" style="height: 350px">
<form action="" id="form">
<h1 id="loginMsg">品牌后台管理系统</h1>
<div id="errorMsg">{{ message }}</div>
<p>账号:<input id="username" v-model="username" type="text"></p>
<p>密码:<input id="password" v-model="password" type="password"></p>
<p>记住我:<input id="remember" v-model="remember" type="checkbox"></p>
<div id="subDiv">
<input type="button" class="button" value="登录" @click="submit">
<input type="reset" class="button" value="重置">
<a href="register.html">没有账号？</a>
</div>
</form>
</div>
</div>
<script>
new Vue({
el: "#app",
data: {
username:'',
password:'',
remember:'',
message:'',
},
mounted(){
//记住账号密码操作，username和password为Cookie名称
//console.log(location.search)
//console.log(document.cookie);
let strCookie = document.cookie;//获取Cookie
let arrCookie = strCookie.split(";");//多个cookie值是以;分隔的，用split把cookie分割开并赋值给数组arrCookie
for (let i = 0; i < arrCookie.length; i++) {//历遍数组
/*
原来割好的数组是：username=zhangsan，再用split('=')分割成：
username zhangsan 这样可以通过arr[0] arr[1]来分别获取username和zhangsan
*/
let arr = arrCookie[i].split("=");
//console.log(arr)
if(arr[0]==='username'){
//如果有相应的Cookie，运用v-model赋值
this.username = arr[1];
// trim() 函数移除字符串两侧的空白字符或其他预定义字符。
}else if(arr[0].trim()==='password'){
this.password = arr[1]
}
}
},
methods:{
submit(){
axios.get("http://localhost:8080/brand-case/loginServlet?username=" + this.username + "&password=" + this.password + "&remember=" + this.remember).then((res)=>{
if(res.data==="success"){
location.href = 'http://localhost:8080/brand-case/brand.html?'+new Date().getMilliseconds()
}else {
this.message = "账号或密码错误"
}
})
}
}
})
</script>
</body>
</html>
4.2LoginServlet
package com.web.servlet;
import com.pojo.User;
import com.service.UserService;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.IOException;
@WebServlet("/loginServlet")
public class LoginServlet extends HttpServlet {
/**
* 登录验证
*/
private UserService service = new UserService();
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// 1.获取用户名密码
String username = request.getParameter("username");
String password = request.getParameter("password");
// 获取复选框数据
String remember = request.getParameter("remember");
// 2.调用service查询
User user = service.login(username,password);
// 3.判断
if(user != null){
// 登陆成功 跳转到查询所有的BrandServlet
// 判断用户是否勾选记住我 空指针异常
if("true".equals(remember)){
// 勾选了 发送Cookie
// 1.创建Cookie对象
Cookie c_username = new Cookie("username",username);
Cookie c_password = new Cookie("password",password);
// 设置Cookie存活时间
c_username.setMaxAge(60 * 60 * 24 * 7);
c_password.setMaxAge(60 * 60 * 24 * 7);
// 2.发送
response.addCookie(c_username);
response.addCookie(c_password);
}
// 将登陆成功后的User对象 存储到session
HttpSession session = request.getSession();
session.setAttribute("user",user);
response.getWriter().write("success");
}else {
// 登陆失败
response.getWriter().write("error");
}
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doGet(request, response);
}
}
4.3LoginFilter
package com.web.filter;
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import java.io.IOException;
/**
* 登陆验证的过滤器
*/
@WebFilter("/*")
public class LoginFilter implements Filter {
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws ServletException, IOException {
HttpServletRequest req = (HttpServletRequest) request;
// 判断访问路径资源是否和登陆注册相关
String[] urls = {"login.html","/element-ui/","/imgs/","/css/","/js/","/loginServlet","register.html","/registerServlet","/checkCodeServlet"};
// 获取当前访问的资源路径
String url = req.getRequestURL().toString();
// 循环判断
for (String u : urls) {
if(url.contains(u)){
// 找到了
// 放行
chain.doFilter(request, response);
return;
}
}
// 1.判断session中是否有user
HttpSession session = req.getSession();
Object user = session.getAttribute("user");
// 2.判断user是否为null
if(user !=null){
// 登陆过了
// 放行
chain.doFilter(request, response);
}else {
// 没有登陆 存储提示信息 跳转到登陆页面
//req.getRequestDispatcher("/login.html").forward(req,response);
req.getRequestDispatcher("/login.html?"+System.currentTimeMillis()).forward(req,response);
}
}
public void init(FilterConfig config) throws ServletException {
}
public void destroy() {
}
}
5.后台主页面
5.1Brand
package com.pojo;
public class Brand {
// id 主键
private Integer id;
// 品牌名称
private String brandName;
// 企业名称
private String companyName;
// 排序字段
private Integer ordered;
// 描述信息
private String description;
// 状态：0：禁用 1：启用
private Integer status;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getBrandName() {
return brandName;
}
public void setBrandName(String brandName) {
this.brandName = brandName;
}
public String getCompanyName() {
return companyName;
}
public void setCompanyName(String companyName) {
this.companyName = companyName;
}
public Integer getOrdered() {
return ordered;
}
public void setOrdered(Integer ordered) {
this.ordered = ordered;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public Integer getStatus() {
return status;
}
//逻辑视图
public String getStatusStr(){
if (status == null){
return "未知";
}
return status == 0 ? "禁用":"启用";
}
public void setStatus(Integer status) {
this.status = status;
}
@Override
public String toString() {
return "Brand{" +
"id=" + id +
", brandName='" + brandName + '\'' +
", companyName='" + companyName + '\'' +
", ordered=" + ordered +
", description='" + description + '\'' +
", status=" + status +
'}';
}
}
5.2BrandMapper
package com.mapper;
import com.pojo.Brand;
import org.apache.ibatis.annotations.Param;
import java.util.List;
public interface BrandMapper {
//查询所有
List<Brand> SelectAll();
//添加数据
void add(Brand brand);
//修改数据
void update(Brand brand);
//删除单个数据，通过id
void deleteById(Brand brand);
//批量删除数据
void deleteByIds(@Param("ids") int[] ids);
//分页查询
List<Brand> selectByPage(@Param("begin") int begin,@Param("size") int size);
//查询数据总数
int selectTotalCount();
//在条件查询的基础上进行分页查询
List<Brand> selectByPageAndCondition(@Param("begin") int begin,@Param("size") int size,@Param("brand") Brand brand);
//通过条件查询符合的数据总数
int selectTotalCountByCondition(Brand brand);
}
5.3BrandMapper.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.mapper.BrandMapper">
<resultMap id="brandResultMap" type="brand">
<result property="brandName" column="brand_name" />
<result property="companyName" column="company_name" />
</resultMap>
<insert id="add">
insert into tb_brand values(null,#{brandName},#{companyName},#{ordered},#{description},#{status});
</insert>
<update id="update">
update tb_brand set brand_name=#{brandName},company_name=#{companyName},ordered=#{ordered},
description=#{description},status=#{status} where id=#{id};
</update>
<delete id="deleteById">
delete from tb_brand where id=#{id};
</delete>
<!--批量删除-->
<delete id="deleteByIds">
delete from tb_brand where id in
<foreach collection="ids" item="id" separator="," open="(" close=")">
#{id}
</foreach>
<!--第二种方法：不过ids必须为字符串，如：String ids="1,2,3,4"
delete from tb_brand where id in (${ids})
-->
</delete>
<select id="SelectAll" resultMap="brandResultMap">
select * from tb_brand;
</select>
<select id="selectByPage" resultMap="brandResultMap">
select * from tb_brand limit #{begin},#{size};
</select>
<select id="selectTotalCount" resultType="java.lang.Integer">
select count(*) from tb_brand;
</select>
<!--查询满足条件的数据并进行分页-->
<!--${}的本质就是字符串拼接，需要手动加单引号；#{}的本质就是占位符赋值，自动添加单引号-->
<select id="selectByPageAndCondition" resultMap="brandResultMap">
select *
from tb_brand
<where>
<if test="brand.brandName != null and brand.brandName != '' ">
and brand_name like #{brand.brandName}
<!--
模糊查询1： 例子所示使用原始方法，因此输入的brand.brandName字符串必须包括%%，
所以由于该例子的brandName包含%%字符串，不能直接替换下面的方法
模糊查询2： and brand_name like concat('%',#{brand.brandName},'%')
模糊查询3： and brand_name like '%${brand.brandName}%'
模糊查询4： and brand_name like "%"#{brand.brandName}"%"
-->
</if>
<if test="brand.companyName != null and brand.companyName != '' ">
and company_name like #{brand.companyName}
</if>
<if test="brand.status != null">
and status = #{brand.status}
</if>
</where>
limit #{begin} , #{size}
</select>
<!--查询满足条件的数据条目数-->
<select id="selectTotalCountByCondition" resultType="java.lang.Integer">
select count(*)
from tb_brand
<where>
<if test="brandName != null and brandName != '' ">
and brand_name like #{brandName}
</if>
<if test="companyName != null and companyName != '' ">
and company_name like #{companyName}
</if>
<if test="status != null">
and status = #{status}
</if>
</where>
</select>
</mapper>
5.4BrandService
package com.service;
import com.pojo.Brand;
import com.pojo.PageBean;
import java.util.List;
//原本方法可在BrandService直接实现，现在为了方便管理和动态处理，在接口实现类BrandServiceImpl实现
public interface BrandService {
//查询所有
/*这个建立的不是接口，是类
public class BrandService {
SqlSessionFactory sqlSessionFactory = SqlSessionFactoryUtils.getSqlSessionFactory();
public List<Brand> selectAll(){
SqlSession sqlSession = sqlSessionFactory.openSession();
BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
List<Brand> brands = mapper.SelectAll();
sqlSession.close();
return brands;
}
}*/
List<Brand> SelectAll();
//添加数据
void add(Brand brand);
//修改数据
void update(Brand brand);
//删除单个数据，通过id
void deleteById(Brand brand);
//批量删除数据
void deleteByIds(int[] ids);
//分页查询，(当前页码，每页展示数据数)
PageBean<Brand> selectByPage(int currentPage,int pageSize);
//分页条件查询，(当前页码，每页展示数据数，条件)
PageBean<Brand> selectByPageAndCondition(int currentPage,int pageSize,Brand brand);
}
5.5BrandServiceImpl
package com.service.impl;
import com.mapper.BrandMapper;
import com.pojo.Brand;
import com.pojo.PageBean;
import com.service.BrandService;
import com.util.SqlSessionFactoryUtils;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import java.util.List;
public class BrandServiceImpl implements BrandService {
//1. 创建SqlSessionFactory 工厂对象
SqlSessionFactory factory = SqlSessionFactoryUtils.getSqlSessionFactory();
@Override
public List<Brand> SelectAll() {
//2. 获取SqlSession对象
SqlSession sqlSession = factory.openSession();
//3. 获取BrandMapper
BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
//4. 调用方法
List<Brand> brands = mapper.SelectAll();
//5. 释放资源
sqlSession.close();
return brands;
}
@Override
public void add(Brand brand) {
//2. 获取SqlSession对象
SqlSession sqlSession = factory.openSession();
//3. 获取BrandMapper
BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
//4. 调用方法
mapper.add(brand);
//5. 执行操作，提交事务
sqlSession.commit();
//6. 释放资源
sqlSession.close();
}
@Override
public void update(Brand brand) {
//2. 获取SqlSession对象
SqlSession sqlSession = factory.openSession();
//3. 获取BrandMapper
BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
//4. 调用方法
mapper.update(brand);
//5. 执行操作，提交事务
sqlSession.commit();
//6. 释放资源
sqlSession.close();
}
@Override
public void deleteById(Brand brand) {
//2. 获取SqlSession对象
SqlSession sqlSession = factory.openSession();
//3. 获取BrandMapper
BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
//4. 调用方法
mapper.deleteById(brand);
//5. 执行操作，提交事务
sqlSession.commit();
//6. 释放资源
sqlSession.close();
}
@Override
public void deleteByIds(int[] ids) {
//2. 获取SqlSession对象
SqlSession sqlSession = factory.openSession();
//3. 获取BrandMapper
BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
//4. 调用方法
mapper.deleteByIds(ids);
//5. 执行操作，提交事务
sqlSession.commit();
//6. 释放资源
sqlSession.close();
}
@Override
public PageBean<Brand> selectByPage(int currentPage, int pageSize) {
//2. 获取SqlSession对象
SqlSession sqlSession = factory.openSession();
//3. 获取BrandMapper
BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
//4.1 计算开始索引
int begin=(currentPage-1)*pageSize;
//4.2. 计算查询条目数
int size=pageSize;
//5. 查询当前页数据
List<Brand> brands = mapper.selectByPage(begin, size);
//6. 查询总记录数
int totalCount = mapper.selectTotalCount();
//补充：如果最后一页没有数据不够导致没有显示完，自动补充空白行，美观
Brand brand1 = null;
int number1=totalCount-(currentPage-1)*pageSize;
if(number1<pageSize){
int number2=pageSize-number1;
for (int i = 1; i <=number2 ; i++) {
brands.add(brand1);
}
}
//7. 封装pageBean对象
PageBean<Brand> pageBean=new PageBean<>();
pageBean.setRows(brands);
pageBean.setTotalCount(totalCount);
//8. 释放资源
sqlSession.close();
return pageBean;
}
@Override
public PageBean<Brand> selectByPageAndCondition(int currentPage, int pageSize, Brand brand) {
//2. 获取SqlSession对象
SqlSession sqlSession = factory.openSession();
//3. 获取BrandMapper
BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
//4. 计算开始索引
int begin = (currentPage - 1) * pageSize;
// 计算查询条目数
int size = pageSize;
// 处理brand条件，模糊表达式
String brandName = brand.getBrandName();
if (brandName != null && brandName.length() > 0) {
brand.setBrandName("%" + brandName + "%");
}
String companyName = brand.getCompanyName();
if (companyName != null && companyName.length() > 0) {
brand.setCompanyName("%" + companyName + "%");
}
//5. 查询当前页数据
List<Brand> rows = mapper.selectByPageAndCondition(begin, size, brand);
//6. 查询总记录数
int totalCount = mapper.selectTotalCountByCondition(brand);
//补充：如果最后一页没有数据不够导致没有显示完，自动补充空白行，美观
Brand brand1 = null;
int number1=totalCount-(currentPage-1)*pageSize;
if(number1<pageSize){
int number2=pageSize-number1;
for (int i = 1; i <=number2 ; i++) {
rows.add(brand1);
}
}
//7. 封装PageBean对象
PageBean<Brand> pageBean = new PageBean<>();
pageBean.setRows(rows);
pageBean.setTotalCount(totalCount);
//8. 释放资源
sqlSession.close();
return pageBean;
}
}
5.6BaseServlet
package com.web.servlet;
/*
替换HttpServlet，根据请求的最后一段路径来进行方法分发
* */
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
public class BaseServlet extends HttpServlet {
//根据请求的最后一段路径进行方法的分发
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//1.获取请求的路径
String uri = req.getRequestURI(); // 例如路径为：/brand-case/brand/selectAll
//2. 获取最后一段路径，方法名
//从路径的后面找到第一个“/”所处位置，然后最后的路径截下来，不携带“/”字符，如“selectAll”
int index = uri.lastIndexOf('/');
//将index位置开始进行索引，返回字符串(方法名)
String methodName = uri.substring(index + 1); // 获取到资源的二级路径 selectAll
//3. 执行方法
//3.1 获取BrandServlet /UserServlet 字节码对象 Class
/*
this为谁调用用它(this所在的方法，如service方法)，它(this)代表谁
如：service方法被BrandServlet调用，this代表BrandServlet
*/
//System.out.println(this);
//下面是通过this获得字节码对象
Class<? extends BaseServlet> cls =this.getClass();
//3.2 获取方法 Method对象
try {
Method method = cls.getMethod(methodName, HttpServletRequest.class, HttpServletResponse.class);
//3.3 执行方法
method.invoke(this,req,resp);
} catch (NoSuchMethodException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
}
}
}
5.7BrandServlet
package com.web.servlet;
import com.alibaba.fastjson.JSON;
import com.pojo.Brand;
import com.pojo.PageBean;
import com.service.BrandService;
import com.service.impl.BrandServiceImpl;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.BufferedReader;
import java.io.IOException;
import java.util.List;
@WebServlet("/brand/*")
public class BrandServlet extends BaseServlet{
//提供impl接口，减小耦合性，可以后进行动态获取实现类，只需要改变BrandServiceImpl
private BrandService brandService = new BrandServiceImpl();
public void SelectAll(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{
//System.out.println("selectAll.....");
//1. 调用service查询
List<Brand> brands = brandService.SelectAll();
//2. 转为JSON(用的Fastjson)
String jsonString = JSON.toJSONString(brands);
//3. 写数据
//告知浏览器响应的数据是什么， 告知浏览器使用什么字符集进行解码
response.setContentType("text/json;charset=utf-8");
response.getWriter().write(jsonString);
}
public void add(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{
//System.out.println("Add.....");
request.setCharacterEncoding("UTF-8");
//1. 接收品牌数据
BufferedReader br = request.getReader();
String params = br.readLine();//json字符串
//转为Brand对象
Brand brand = JSON.parseObject(params, Brand.class);
//2. 调用service添加
brandService.add(brand);
//3. 响应成功的标识
response.getWriter().write("success");
}
public void update(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{
request.setCharacterEncoding("UTF-8");
//1. 接收品牌数据
BufferedReader br = request.getReader();
String params = br.readLine();//json字符串
//转为Brand对象
Brand brand = JSON.parseObject(params, Brand.class);
//2. 调用service修改
brandService.update(brand);
//3. 响应成功的标识
response.getWriter().write("success");
}
public void deleteById(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{
//1. 接收品牌数据
BufferedReader br = request.getReader();
String params = br.readLine();//json字符串
//转为Brand对象
Brand brand = JSON.parseObject(params, Brand.class);
//2. 调用service修改
brandService.deleteById(brand);
//3. 响应成功的标识
response.getWriter().write("success");
}
public void deleteByIds(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{
//1. 接收品牌数据，像这样的[1,2,3,4]，所以还用JSON
BufferedReader br = request.getReader();
String params = br.readLine();//json字符串
//转为 int[]数组
int[] ids = JSON.parseObject(params, int[].class);
//2. 调用service修改
brandService.deleteByIds(ids);
//3. 响应成功的标识
response.getWriter().write("success");
}
//分页查询
public void selectByPage(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{
//1. 接收参数，(当前页码，每页展示条数) 如：url?currentPage=1&pageSize=20
String currentPageX = request.getParameter("currentPage");
String pageSizeX = request.getParameter("pageSize");
int currentPage = Integer.parseInt(currentPageX);
int pageSize = Integer.parseInt(pageSizeX);
//2. 调用service
PageBean<Brand> pageBean = brandService.selectByPage(currentPage, pageSize);
//2. 转为JSON(用的Fastjson)
String jsonString = JSON.toJSONString(pageBean);
//3. 写数据
//告知浏览器响应的数据是什么， 告知浏览器使用什么字符集进行解码
response.setContentType("text/json;charset=utf-8");
response.getWriter().write(jsonString);
}
//条件分页查询
public void selectByPageAndCondition(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//1. 接收 当前页码 和 每页展示条数 url?currentPage=1&pageSize=5
String _currentPage = request.getParameter("currentPage");
String _pageSize = request.getParameter("pageSize");
int currentPage = Integer.parseInt(_currentPage);
int pageSize = Integer.parseInt(_pageSize);
// 获取查询条件对象
BufferedReader br = request.getReader();
String params = br.readLine();//json字符串
//转为 Brand
Brand brand = JSON.parseObject(params, Brand.class);
//2. 调用service查询
PageBean<Brand> pageBean = brandService.selectByPageAndCondition(currentPage,pageSize,brand);
//2. 转为JSON
String jsonString = JSON.toJSONString(pageBean);
//3. 写数据
response.setContentType("text/json;charset=utf-8");
response.getWriter().write(jsonString);
}
}
5.8PageBean
package com.pojo;
import java.util.List;
//分页查询的javabean
/*为可以应用其他数据，创造一个泛型T
可在创建PageBean对象时进行指定，提高数据通用性*/
public class PageBean<T> {
//总记录数
private int totalCount;
//当前页数据
private List<T> rows;
public int getTotalCount() {
return totalCount;
}
public void setTotalCount(int totalCount) {
this.totalCount = totalCount;
}
public List<T> getRows() {
return rows;
}
public void setRows(List<T> rows) {
this.rows = rows;
}
@Override
public String toString() {
return "PageBean{" +
"totalCount=" + totalCount +
", rows=" + rows +
'}';
}
}
5.9brand.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>主页面</title>
<style>
.el-table .warning-row {
background: white;
}
.el-table .success-row {
background: #f0f9eb;
}
</style>
</head>
<body>
<!--elementUI 页面如果需要加载很多东西的时候,
自己定义的按钮或者弹出框dialog的文字就会显示在页面上, 一闪而过, 因此需要优化一下-->
<!--在页面完成加载前先显示loddingg，加载完成后，将appLoading设为none，将app显示-->
<div id="appLoading">
<span><h1>Loading...</h1></span>
</div>
<div id="app" style="display: none">
<!--搜索表单-->
<el-form :inline="true" :model="brand" class="demo-form-inline">
<el-form-item label="当前状态">
<el-select v-model="brand.status" placeholder="当前状态" clearable>
<!-- clearable使表格点击后可清空选择 -->
<el-option label="启用" value="1"></el-option>
<el-option label="禁用" value="0"></el-option>
</el-select>
</el-form-item>
<el-form-item label="企业名称">
<el-input v-model="brand.companyName" placeholder="企业名称" clearable></el-input>
</el-form-item>
<el-form-item label="品牌名称">
<el-input v-model="brand.brandName" placeholder="品牌名称" clearable></el-input>
</el-form-item>
<el-form-item>
<el-button type="primary" @click="onSubmit">查询</el-button>
</el-form-item>
</el-form>
<!--按钮-->
<el-row>
<el-button type="danger" plain @click="deleteByIds">批量删除</el-button>
<el-button type="primary" plain @click="AddData">新增</el-button>
</el-row>
<!--添加数据对话框表单-->
<el-dialog
title="添加品牌"
:visible.sync="AddDialogVisible"
width="30%"
@close="close"
>
<el-form ref="form" :model="brand" label-width="80px">
<el-form-item label="品牌名称">
<el-input v-model="brand.brandName"></el-input>
</el-form-item>
<el-form-item label="企业名称">
<el-input v-model="brand.companyName"></el-input>
</el-form-item>
<el-form-item label="排序">
<el-input v-model="brand.ordered"></el-input>
</el-form-item>
<el-form-item label="备注">
<el-input type="textarea" v-model="brand.description"></el-input>
</el-form-item>
<el-form-item label="状态">
<el-switch v-model="brand.status"
active-text="启用"
inactive-text="禁用"
active-value="1"
inactive-value="0"
></el-switch>
</el-form-item>
<el-form-item>
<el-button type="primary" @click="addBrand">提交</el-button>
<el-button @click="AddDialogVisible = false">取消</el-button>
</el-form-item>
</el-form>
</el-dialog>
<!--修改数据对话框表单-->
<el-dialog
title="修改品牌"
:visible.sync="UpdateDialogVisible"
width="30%"
@close="close"
>
<el-form ref="form" :model="brand" label-width="80px">
<el-form-item label="品牌名称">
<el-input v-model="brand.brandName"></el-input>
</el-form-item>
<el-form-item label="企业名称">
<el-input v-model="brand.companyName"></el-input>
</el-form-item>
<el-form-item label="排序">
<el-input v-model="brand.ordered"></el-input>
</el-form-item>
<el-form-item label="备注">
<el-input type="textarea" v-model="brand.description"></el-input>
</el-form-item>
<el-form-item label="状态">
<el-switch v-model="brand.status"
active-text="启用"
inactive-text="禁用"
active-value="1"
inactive-value="0"
></el-switch>
</el-form-item>
<el-form-item>
<el-button type="primary" @click="updateBrand">修改</el-button>
<el-button @click="Updatecancel">取消</el-button>
</el-form-item>
</el-form>
</el-dialog>
<!--表格-->
<template>
<el-table
:data="tableData"
style="width: 100%"
:row-class-name="tableRowClassName"
@selection-change="handleSelectionChange"
>
<el-table-column
type="selection"
width="55">
</el-table-column>
<el-table-column
prop="id"
label="ID"
width="50"
align="center"
>
</el-table-column>
<el-table-column
prop="brandName"
label="品牌名称"
align="center"
>
</el-table-column>
<el-table-column
prop="companyName"
label="企业名称"
align="center"
>
</el-table-column>
<el-table-column
prop="ordered"
align="center"
label="排序">
</el-table-column>
<el-table-column
prop="statusStr"
align="center"
label="当前状态">
</el-table-column>
<el-table-column
align="center"
label="操作">
<template slot-scope="scope">
<el-row>
<!-- scope.row获取某一行数据，scope.row.id获取此行id -->
<el-button type="primary" @click="beforeUpdate(scope.row)">修改</el-button>
<el-button type="danger" @click="deleteById(scope.row)">删除</el-button>
</el-row>
</template>
</el-table-column>
</el-table>
</template>
<!--分页工具条-->
<el-pagination
@size-change="handleSizeChange"
@current-change="handleCurrentChange"
:current-page="currentPage"
:page-sizes="[8, 10, 15, 20]"
:page-size="8"
layout="total, sizes, prev, pager, next, jumper"
:total="totalCount">
</el-pagination>
</div>
<script src="js/vue.js"></script>
<script src="element-ui/lib/index.js"></script>
<script src="js/axios-0.18.0.js"></script>
<link rel="stylesheet" href="element-ui/lib/theme-chalk/index.css">
<script>
new Vue({
el: "#app",
//页面加载完毕后发送 ajax 请求，要用mounted
mounted(){
//加载完成后，div加载页面变为none，主页面显示
document.getElementById('app').style.display = 'block';
document.getElementById('appLoading').style.display = 'none';
//将查询所有操作封装为了一个方法，以便以后调用
this.selectAll();
/*var _this = this;
axios({
method:"get",
url:"http://localhost:8080/brand-case/SelectAllServlet"
}).then(function (resp) {
//将表格的值tableData赋值响应得到的集合
_this.tableData = resp.data;
})*/
},
methods: {
//查询所有数据的方法
selectAll(){
/*var _this = this;
axios({
method:"get",
// url:"http://localhost:8080/brand-case/SelectAllServlet"
url:"http://localhost:8080/brand-case/brand/SelectAll",
}).then(function (resp) {
//将表格的值tableData赋值响应得到的集合
_this.tableData = resp.data;
})*/
//分页查询
//页面挂载完成后及添加后修改后正在使用此方法
var _this = this;
axios({
method:"get",
//分页查询：
url:"http://localhost:8080/brand-case/brand/selectByPage?currentPage="+ _this.currentPage+"&pageSize="+_this.pageSize,
}).then(function (resp) {
//此时返回的数据为pageBean对象，具有一个brand数据集合，一个数据总数
//将表格的值tableData赋值响应得到的集合
_this.tableData = resp.data.rows;// {rows:[],totalCount:100}
//设置总记录数
_this.totalCount = resp.data.totalCount;
})
},
//分页条件查询，大范围：全部分页和条件分页均可用，不过全部分页默认data为空
//搜索框查询和分页后查询正在使用
selectByPageAndCondition(){
//分页条件查询
axios({
method:"post",
url:"http://localhost:8080/brand-case/brand/selectByPageAndCondition?currentPage="+this.currentPage+"&pageSize="+this.pageSize,
data:this.brand
/*
then里匿名函数的this特点：需要在成功的回调函数（也就是then 函数中的匿名函数）中使用this，
都需要在外边使用 _this 记录一下 this 所指向的对象；
因为在外边的 this 表示的是 Vue 对象，而回调函数中的 this 表示的是window对象。
*/
/*箭头函数的作用：
替换（简化）匿名函数。then(箭头函数)里面的this是vue不是window。*/
//所有的function (resp){}均可替换为resp =>{}，且不再需要this的转化
}).then(resp =>{
//补充：如果分页查询最后一页没有数据不够导致没有显示完，
// BrandServiceImpl里的分页查询方法会自动补充空白行，美观
//设置表格数据
this.tableData = resp.data.rows; // {rows:[],totalCount:100}
//设置总记录数
this.totalCount = resp.data.totalCount;
})
},
//Element自带表格方法，表格颜色
tableRowClassName({row, rowIndex}) {
if (rowIndex%2===1) {
return 'warning-row';
} else{
return 'success-row';
}
return '';
},
// 复选框选中后执行的方法
handleSelectionChange(val) {
console.log(this.multipleSelection);
//返回brand集合
this.multipleSelection = val;
},
// 搜索框查询方法
onSubmit() {
console.log(this.brand);
//点击查询后，自动回到数据第一页
this.currentPage=1;
this.selectByPageAndCondition();
},
// 添加数据
addBrand(){
//console.log(this.brand);
var _this=this;
//发送ajax异步请求，添加数据
axios({
method: "post",
// url:"http://localhost:8080/brand-case/AddServlet",
url:"http://localhost:8080/brand-case/brand/add",
data:_this.brand
}).then(function (resp) {
if(resp.data=="success"){
//添加成功
//1.关闭窗口
_this.AddDialogVisible = false;
//2.重新查询数据
//该操作结束后，回到第一页，查询全部，清除brand数据，防止干扰下次操作
_this.currentPage=1;
_this.selectAll();
_this.clear();
//3.弹出消息提示
_this.$message({
message: '恭喜你，添加成功',
type: 'success'
});
}else {
_this.$message.error('添加数据失败');
}
})
},
//修改绑定数据
beforeUpdate(row){
/*注意：
问题：一旦表单的数据被改变，表格中相对应的数据也会直接跟着改变，
且无论是点击确定还是点击取消按钮，表格的数据依旧会被修改。
原因：因为row是Object对象类型，如果直接赋值的话，就变成了浅拷贝，复制的是地址，
导致在表单中改变值的时候表格中的数据也跟着改变，所以要进行深拷贝。
解决方法：JSON.parse(JSON.stringify(obj)) 这行代码的意思就是利用 JSON.stringify 将 js 对象序列化（JSON字符串），
再使用 JSON.parse 来反序列化（还原） js 对象。序列化的作用是存储和传输。
*/
//this.brand=row;
this.brand = JSON.parse(JSON.stringify(row));
this.UpdateDialogVisible=true;
//控制修改页面表单按钮
if(row.status=="1"){
this.brand.status="1";
}else{
this.brand.status="0";
}
},
//修改数据
updateBrand(){
var _this=this;
axios({
method:"post",
url:"http://localhost:8080/brand-case/brand/update",
data:this.brand
}).then(function (resp){
if (resp.data=="success"){
//修改成功
_this.UpdateDialogVisible = false;
//该操作结束后，回到第一页，查询全部，清除brand数据，防止干扰下次操作
//修改操作，既没有添加数据，又没有删除数据，不需要回到第一页的操作
_this.selectByPageAndCondition();
_this.clear();
_this.$message({
message: '恭喜你，修改完成',
type: 'success'
});
}else {
_this.$message.error('修改数据失败');
}
})
},
//修改表单点击取消后触发
Updatecancel(){
this.UpdateDialogVisible = false;
//清除brand数据，防止干扰下次操作
this.clear();
},
//关闭添加和修改表单时，点击×号
close(){
//清除brand数据，防止干扰下次操作
this.clear();
},
//删除单个数据
deleteById(row){
this.brand = JSON.parse(JSON.stringify(row));
this.$confirm('是否删除该品牌, 请继续?', '提示', {
confirmButtonText: '确定',
cancelButtonText: '取消',
type: 'warning'
}).then(() => {
//用户点击确定删除
var _this=this;
axios({
method:"post",
url:"http://localhost:8080/brand-case/brand/deleteById",
data:_this.brand
}).then(function (resp){
if (resp.data=="success"){
//删除成功
//该操作结束后，回到第一页，查询全部，清除brand数据，防止干扰下次操作
_this.currentPage=1;
_this.selectAll();
_this.clear();
_this.$message({
type: 'success',
message: '删除成功!'
});
}else {
_this.$message.error('删除数据失败');
}
})
}).catch(() => {
_this.$message({
type: 'info',
message: '已取消删除'
});
});
},
//复选框批量删除
deleteByIds(){
//这是批量选中后的数据模型，可以从 `multipleSelection` 数据模型中获取所选数据的id值
//console.log(this.multipleSelection);
//如果复选框选中则可进行批量删除，否则弹出未选中提示框
if(this.multipleSelection.length==0){
this.$alert('请先进行多选，然后点击批量删除', '消息提示', {
confirmButtonText: '确定'
});
}else{
//弹出确认框
this.$confirm('正在批量删除数据, 是否继续?', '提示', {
confirmButtonText: '确定',
cancelButtonText: '取消',
type: 'warning'
}).then(() => {
//用户点击确定删除
//1.创建id数组 [1,2,3,4],从this.multipleSelection获取
for (let i = 0; i < this.multipleSelection.length; i++) {
let selectionElement = this.multipleSelection[i];
this.selectedIds[i]=selectionElement.id;
}
//2.发送ajax请求
var _this=this;
axios({
method: "post",
url:"http://localhost:8080/brand-case/brand/deleteByIds",
data:_this.selectedIds
}).then(function (resp) {
if(resp.data=="success"){
//批量删除成功
//1.重新查询数据
_this.currentPage=1;
_this.selectAll();
_this.clear();
//2.弹出消息提示
_this.$message({
message: '恭喜你，批量删除成功',
type: 'success'
});
}else {
_this.$message.error('批量删除失败');
}
})
}).catch(() => {
this.$message({
type: 'info',
message: '已取消删除'
});
});
}
},
//模型清空操作，防止新增操作时，新增页面具有默认数据
clear(){
this.brand.brandName="";
this.brand.companyName="";
this.brand.ordered="";
this.brand.description="";
this.brand.status="";
},
//点击新增按钮操作
AddData(){
this.clear();
this.AddDialogVisible = true;
},
//分页
handleSizeChange(val) {
//console.log(`每页 ${val} 条`);
//重新设置每页显示条数
this.pageSize=val;
this.selectByPageAndCondition();
},
handleCurrentChange(val) {
//console.log(`当前页: ${val}`);
//重新设置当前页码
this.currentPage=val;
this.selectByPageAndCondition();
}
},
data() {
return {
//每页显示的条数
pageSize:8,
//总记录数
totalCount:100,
// 当前页码
currentPage: 1,
// 添加数据对话框是否展示的标记
AddDialogVisible: false,
// 修改数据对话框是否展示的标记
UpdateDialogVisible: false,
// 品牌模型数据
brand: {
status: '',
brandName: '',
companyName: '',
id:"",
ordered:"",
description:""
},
//被选中的id数组
selectedIds:[],
// 复选框选中数据集合
multipleSelection: [],
// 表格数据
//初始设置8个初数据，防止进入主页面时产生闪烁干扰，影响体验
tableData: [{
id:"",
brandName: '',
companyName: '',
ordered:"",
status: ''
}, {
id:"",
brandName: '',
companyName: '',
ordered:"",
status: ''
}, {
id:"",
brandName: '',
companyName: '',
ordered:"",
status: ''
}, {
id:"",
brandName: '',
companyName: '',
ordered:"",
status: ''
},{
id:"",
brandName: '',
companyName: '',
ordered:"",
status: ''
}, {
id:"",
brandName: '',
companyName: '',
ordered:"",
status: ''
}, {
id:"",
brandName: '',
companyName: '',
ordered:"",
status: ''
}, {
id:"",
brandName: '',
companyName: '',
ordered:"",
status: ''
}]
}
}
})
</script>
</body>
</html>
6.工程结构
7.代码下载
** Gitte：**品牌后台管理系统: JavaWeb综合案例——品牌后台管理系统 mybatis+maven+filter+ajax+json+js+html+css+element+VUE (gitee.com)
CSDN：黑马程序员最新版JavaWeb综合案例——品牌后台管理系统-Java文档类资源-CSDN文库https://download.csdn.net/download/weixin_59798969/86399430
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本文转载自: https://blog.csdn.net/weixin_59798969/article/details/126310282
版权归原作者 不知迷踪 所有， 如有侵权，请联系我们删除。
版权归原作者 不知迷踪 所有， 如有侵权，请联系我们删除。