一、新建项目
1.新建maven项目
2.点击Next,填写GroupId、ArtifactId
groupId一般是域名的反写,也作为项目中类的包名,artifactId是工程名,也就是根文件夹名
3.点击Next,配置路径
Maven home directory选择maven本地安装路径;
勾上User setting file 的 Override前的√,选择本地maven安装的settings.xml配置文件路径
4.继续next,选择项目保存的位置
5.构建项目目录
- main 右击选择 Directory 创建 java 和 resources两个文件;
- 再后点击右上角(画箭头号)处,弹出该界面;
- 选择java点击Sources,选择resources点击Resources,之后Apply点击OK;
创建时可以直接选择提示的
如果新建的目录没有图标就需要设置目录源
成功后的图标:
二、配置文件
1.pom.xml配置
<?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>com.springmvc</groupId>
<artifactId>hellobeijing</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>war</packaging>
<name>hellobeijing Maven Webapp</name>
<!-- FIXME change it to the project's website -->
<url>http://maven.apache.org</url>
<properties>
<!-- spring版本号 -->
<spring.version>4.2.5.RELEASE</spring.version>
<!-- mybatis版本号 -->
<mybatis.version>3.2.4</mybatis.version>
<!-- log4j日志文件管理包版本 -->
<slf4j.version>1.6.6</slf4j.version>
<log4j.version>1.2.12</log4j.version>
</properties>
<dependencies>
<!-- spring核心包 -->
<!-- springframe start -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-oxm</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${spring.version}</version>
</dependency>
<!-- springframe end -->
<!-- mybatis核心包 -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>${mybatis.version}</version>
</dependency>
<!-- mybatis/spring包 -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.2.2</version>
</dependency>
<!-- mysql驱动包 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.29</version>
</dependency>
<!-- c3p0 -->
<dependency>
<groupId>com.mchange</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.5.2</version>
</dependency>
<!-- junit测试包 -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
<!-- jstl -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>2.2.1-b03</version>
<scope>provided</scope>
</dependency>
<!-- servlet -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
<scope>provided</scope>
</dependency>
<!-- json数据 -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.7.1</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>2.7.1</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.7.1</version>
</dependency>
<dependency>
<groupId>net.sf.json-lib</groupId>
<artifactId>json-lib</artifactId>
<version>2.4</version>
<classifier>jdk15</classifier>
</dependency>
<!-- commons -->
<dependency>
<groupId>commons-lang</groupId>
<artifactId>commons-lang</artifactId>
<version>2.4</version>
</dependency>
<dependency>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
<version>1.1</version>
</dependency>
<dependency>
<groupId>commons-pool</groupId>
<artifactId>commons-pool</artifactId>
<version>1.5.6</version>
</dependency>
<dependency>
<groupId>commons-dbcp</groupId>
<artifactId>commons-dbcp</artifactId>
<version>1.4</version>
</dependency>
<dependency>
<groupId>commons-beanutils</groupId>
<artifactId>commons-beanutils</artifactId>
<version>1.8.3</version>
</dependency>
<dependency>
<groupId>commons-httpclient</groupId>
<artifactId>commons-httpclient</artifactId>
<version>3.1</version>
</dependency>
<dependency>
<groupId>commons-collections</groupId>
<artifactId>commons-collections</artifactId>
<version>3.1</version>
</dependency>
<dependency>
<groupId>commons-codec</groupId>
<artifactId>commons-codec</artifactId>
<version>1.9</version>
</dependency>
<dependency>
<groupId>javax.annotation</groupId>
<artifactId>jsr250-api</artifactId>
<version>1.0</version>
</dependency>
<dependency>
<groupId>net.sf.ezmorph</groupId>
<artifactId>ezmorph</artifactId>
<version>1.0.6</version>
</dependency>
<dependency>
<groupId>javax.activation</groupId>
<artifactId>activation</artifactId>
<version>1.1</version>
</dependency>
<dependency>
<groupId>taglibs</groupId>
<artifactId>standard</artifactId>
<version>1.1.2</version>
</dependency>
<!-- 日志文件管理包 -->
<!-- log start -->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>${log4j.version}</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>${slf4j.version}</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>${slf4j.version}</version>
</dependency>
<!--上传-->
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3.1</version>
</dependency>
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.4</version>
</dependency>
<!-- log end -->
</dependencies>
<build>
<finalName>helloworld</finalName>
<plugins>
<plugin>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-maven-plugin</artifactId>
<version>1.3.2</version>
<configuration>
<!--允许移动生成的文件-->
<verbose>true</verbose>
<!--允许覆盖生成的文件-->
<overwrite>true</overwrite>
</configuration>
</plugin>
</plugins>
</build>
</project>
2.jdbc.properties配置
jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/17bang?useUnicode=true&characterEncoding=utf-8
jdbc.username=root
jdbc.password=1234
#最大连接数
maxPoolSize=20
#最小连接数
minPoolSize=10
#连接超时时间
checkoutTimeout=60000
#失败重连次数
acquireRetryAttempts=3
3.mybatis-config.xml配置
<?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>
<settings>
<setting name="mapUnderscoreToCamelCase" value="true"/>
<setting name="jdbcTypeForNull" value="NULL"/>
<!--显式的指定每个我们需要更改的配置的值,即使他是默认的。防止版本更新带来的问题 -->
<setting name="cacheEnabled" value="true"/>
<setting name="lazyLoadingEnabled" value="true"/>
<setting name="aggressiveLazyLoading" value="false"/>
<!-- 使⽤jdbc的getGeneratedKeys获取数据库⾃增主键值 -->
<setting name="useGeneratedKeys" value="true" />
<!-- 使⽤列别名替换列名 默认:true -->
<setting name="useColumnLabel" value="true" />
<setting name="cacheEnabled" value="true"/>
</settings>
</configuration>
4.applicationContext.xml配置
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/springtx.xsd">
<!--配合MyBatis-->
<!--配置数据库参数-->
<context:property-placeholder location="classpath:jdbc.properties"/>
<!--数据库连接池-->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<!--配置连接池属性-->
<property name="driverClass" value="${jdbc.driver}"/>
<property name="jdbcUrl" value="${jdbc.url}"/>
<property name="user" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
<!--c3p0连接池私有属性-->
<property name="maxPoolSize" value="${maxPoolSize}"/>
<property name="minPoolSize" value="${minPoolSize}"/>
<property name="autoCommitOnClose" value="false"/>
<property name="checkoutTimeout" value="${checkoutTimeout}"/>
<property name="acquireRetryAttempts" value="${acquireRetryAttempts}"/>
</bean>
<!-- 配置 SqlSessionFactory 对象,spring和MyBatis完美整合,不需要mybatis的配置映射文件-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<!--注入数据库连接池-->
<property name="dataSource" ref="dataSource"/>
<!-- 配置 MyBaties 全局配置⽂件:mybatis-config.xml -->
<property name="configLocation" value="classpath:mybatis-config.xml"/>
<!-- 扫描 model 包 使⽤别名 -->
<property name="typeAliasesPackage" value="com.springmvc.entity"/>
<!-- 扫描 sql 配置⽂件:mapper 需要的 xml ⽂件 -->
<property name="mapperLocations" value="classpath:mappers/*.xml"/>
</bean>
<!-- 配置扫描 dao 接⼝包, 动态实现 dao 接⼝, 注⼊到 Spring 容器中 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<!-- 注⼊ sqlSessionFactory -->
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
<!-- 给出需要扫描 dao 接⼝包 -->
<property name="basePackage" value="com.springmvc.dao"/>
</bean>
<!--spring-service-->
<!-- 扫描 service 包下所有使⽤注解的类型 -->
<context:component-scan base-package="com.springmvc.service"/>
<!-- 配置事务管理器 -->
<bean id="transactionManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<!-- 注⼊数据库连接池 -->
<property name="dataSource" ref="dataSource"/>
</bean>
</beans>
5. dispatcherServlet.xml配置
也可能叫 spring-mvc.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
<!-- controller扫描器 -->
<context:component-scan base-package="com.springmvc.controller"/>
<!-- 配置注解驱动 -->
<mvc:annotation-driven/>
<!-- 视图解析器 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<!--前缀-->
<property name="prefix" value="/WEB-INF/views/"/>
<!--后缀-->
<property name="suffix" value=".jsp"/>
</bean>
<!--静态资源默认servlet配置
(1)加⼊对静态资源的处理: js,gif,png
(2)允许使⽤"/"做整体映射
-->
<mvc:default-servlet-handler/>
</beans>
6.web.xml配置
<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd" >
<web-app>
<display-name>Archetype Created Web Application</display-name>
<!--Spring MVC 配置 并添加监听-->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring/applicationContext.xml</param-value>
</context-param>
<!-- 字符过滤器 传值乱码-->
<filter>
<filter-name>encodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>encodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!--配置前端控制器 进行请求分发 DispatcherServlet本质也是一个Servlet -->
<servlet>
<!--名字可以自定义-->
<servlet-name>SpringMVC</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:dispatcherServlet.xml</param-value>
</init-param>
<!--标记容器启动的时候就启动这个servlet-->
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>SpringMVC</servlet-name>
<!--拦截所有-->
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
三.配置log4j日志
1.pom.xml配置
上面 pom.xml 已经添加了
<properties>
<!-- log4j日志文件管理包版本 -->
<slf4j.version>1.6.6</slf4j.version>
<log4j.version>1.2.12</log4j.version>
</properties
<dependencies>
<!-- 日志文件管理包 -->
<!-- log start -->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>${log4j.version}</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>${slf4j.version}</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>${slf4j.version}</version>
</dependency>
</dependencies>
2.log4j.properties配置
### set log levels ###
log4j.rootLogger = INFO,D
###输出到控制台###
log4j.logger.toConsole=debug,stdout
log4j.appender.stdout = org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target = System.out
log4j.appender.stdout.layout = org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern =%d{yyyy-MM-dd HH\:mm\:ss} [%5p] - %c -%F(%L) -%m%n
### 输出到日志文件 ###
## 其中File 可以采用绝对路径 亦可以采用相对路径 catalina.home 是tomcat目录 如果没有logs文件夹 将会报错 ##
## 更加倾向于将日志文件放在 D:/database/log4j/log4jTest/logtest.log ##
## 绝对路径如:e:/logtest.log ##
log4j.logger.daily=INFO,D
log4j.appender.D = org.apache.log4j.DailyRollingFileAppender
log4j.appender.D.File = D:/database/log4j/log4jTest/logtest.log
log4j.appender.D.Append = true
log4j.appender.D.Threshold = INFO
log4j.appender.D.layout = org.apache.log4j.PatternLayout
log4j.appender.D.layout.ConversionPattern =%d{yyyy-MM-dd HH\:mm\:ss} [%5p] - %c -%F(%L) -%m%n
##log4j.logger.org.apache.ibatis=debug,stdout
##log4j.logger.java.sql=debug,stdout
四.mybatis逆向工程
Mybatis-Generator自动生成Dao、Model层相关代码
1.pom.xml配置
注意:mybatis-generator-maven-plugin 插件的plugins标签要与pluginManagement标签并列,不然在右边Maven中找不到该插件
<!-- https://mvnrepository.com/artifact/org.mybatis.generator/mybatis-generator-core -->
<dependency>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-core</artifactId>
<version>1.3.5</version>
</dependency>
<!--注意:mybatis-generator-maven-plugin 插件的plugins标签要与</pluginManagement>并列-->
<plugins>
<plugin>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-maven-plugin</artifactId>
<version>1.3.5</version>
<configuration>
<verbose>true</verbose>
<overwrite>true</overwrite>
</configuration>
</plugin>
</plugins>
2.generatorConfig.xml配置
classPathEntry 标签值根据本地位置修改
第一个(推荐)
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
"http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>
<!--导入属性配置 jdbc配置文件-->
<properties resource="jdbc.properties"></properties>
<!--
targetRuntime: 执行生成的逆向工程的版本
MyBatis3Simple: 生成基本的CRUD(清新简洁版)
MyBatis3: 生成带条件的CRUD(奢华尊享版)
-->
<context id="DB2Tables" targetRuntime="MyBatis3">
<!--jdbc的数据库连接 -->
<jdbcConnection driverClass="${jdbc.driver}" connectionURL="${jdbc.url}"
userId="${jdbc.username}" password="${jdbc.password}">
</jdbcConnection>
<!-- javaBean的生成策略-->
<javaModelGenerator targetPackage="com.springmvc.entity" targetProject="./src/main/java">
<property name="enableSubPackages" value="true" />
<property name="trimStrings" value="true" />
</javaModelGenerator>
<!-- SQL映射文件的生成策略 -->
<sqlMapGenerator targetPackage="mappers" targetProject="./src/main/resources">
<property name="enableSubPackages" value="true" />
</sqlMapGenerator>
<!-- Mapper接口的生成策略 -->
<javaClientGenerator type="XMLMAPPER" targetPackage="com.springmvc.dao" targetProject="./src/main/java">
<property name="enableSubPackages" value="true" />
</javaClientGenerator>
<!-- 逆向分析的表 -->
<!-- tableName设置为*号,可以对应所有表,此时不写domainObjectName -->
<!-- domainObjectName属性指定生成出来的实体类的类名 -->
<table tableName="user" domainObjectName="User" >
</table>
</context>
</generatorConfiguration>
第二个
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
"http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>
<!--导入属性配置 jdbc配置文件-->
<properties resource="jdbc.properties"></properties>
<!--指定特定数据库的jdbc驱动jar包的位置 此处需要指明mysql-connector-java-5.1.30.jar的绝对路径,否则会报错!-->
<classPathEntry location="D:\Application\IDEA\repository\mysql\mysql-connector-java\8.0.11\mysql-connector-java-8.0.11.jar"/>
<context id="default" targetRuntime="MyBatis3">
<!-- optional,旨在创建class时,对注释进行控制 -->
<commentGenerator>
<property name="suppressDate" value="true"/>
<!-- 是否去除自动生成的注释 true:是 : false:否 -->
<property name="suppressAllComments" value="true"/>
</commentGenerator>
<!--jdbc的数据库连接 -->
<jdbcConnection driverClass="${jdbc.driver}" connectionURL="${jdbc.url}"
userId="${jdbc.username}" password="${jdbc.password}">
</jdbcConnection>
<!-- 非必需,类型处理器,在数据库类型和java类型之间的转换控制-->
<javaTypeResolver>
<property name="forceBigDecimals" value="false"/>
</javaTypeResolver>
<!-- 生成模型model的包名和位置 此处需要根据自己项目做调整-->
<!-- Model模型生成器,用来生成含有主键key的类,记录类 以及查询Example类
targetPackage 指定生成的model生成所在的包名
targetProject 指定在该项目下所在的路径
-->
<!--<javaModelGenerator targetPackage="com.mmall.pojo" targetProject=".\src\main\java">-->
<javaModelGenerator targetPackage="com.springmvc.entity" targetProject="./src/main/java">
<!-- 是否允许子包,即targetPackage.schemaName.tableName -->
<property name="enableSubPackages" value="false"/>
<!-- 是否对model添加 构造函数 -->
<property name="constructorBased" value="true"/>
<!-- 是否对类CHAR类型的列的数据进行trim操作 (去空)-->
<property name="trimStrings" value="true"/>
<!-- 建立的Model对象是否 不可改变 即生成的Model对象不会有 setter方法,只有构造方法 -->
<property name="immutable" value="false"/>
</javaModelGenerator>
<!--mapper映射文件生成所在的目录 为每一个数据库的表生成对应的SqlMap文件 -->
<!--<sqlMapGenerator targetPackage="mappers" targetProject=".\src\main\resources">-->
<sqlMapGenerator targetPackage="mappers" targetProject="./src/main/resources">
<property name="enableSubPackages" value="false"/>
</sqlMapGenerator>
<!-- 客户端代码,生成易于使用的针对Model对象和XML配置文件 的代码
type="ANNOTATEDMAPPER",生成Java Model 和基于注解的Mapper对象
type="MIXEDMAPPER",生成基于注解的Java Model 和相应的Mapper对象
type="XMLMAPPER",生成SQLMap XML文件和独立的Mapper接口
-->
<!-- targetPackage:mapper接口dao生成的位置 -->
<!--<javaClientGenerator type="XMLMAPPER" targetPackage="com.mmall.dao" targetProject=".\src\main\java">-->
<javaClientGenerator type="XMLMAPPER" targetPackage="com.springmvc.dao" targetProject="./src/main/java">
<!-- enableSubPackages:是否让schema作为包的后缀 -->
<property name="enableSubPackages" value="false"/>
</javaClientGenerator>
<!-- 要生成的表 tableName是数据库中的表名或视图名 domainObjectName是实体类名 -->
<table tableName="user" domainObjectName="User" enableCountByExample="false"
enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false"
selectByExampleQueryId="false">
</table>
<!-- 数据库中该字段的类型是 txt ,不同版本生成对应字体类的属性类型可能不同,因此指定转换类型 -->
<!-- mybatis插件的搭建 -->
</context>
</generatorConfiguration>
3.找到 Maven ----> …Webapp -----> Plugins -----> mybatis-generator
(注!!!:这里有时候会发现没有该插件,这时是pom.xml中mybatis-generator-maven-plugin 插件的plugins标签要与pluginManagement标签并列)
-----> mybatis-generator:generate -----> 右击 选择 Run Maven Build
生成的文件:
五、开发
1.数据库
use 17bang;
create table `user`(
id INT(11),
`name` VARCHAR(25),
age INT(11)
) ENGINE=INNODB DEFAULT CHARSET=utf8;
select * from `user`;
insert into `user` (id,`name`,age) values(1,'张三',20),(2,'李四',18);
2.UserService.java
package com.springmvc.service;
import com.springmvc.dao.UserMapper;
import com.springmvc.entity.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import java.util.List;
@Service
@Transactional
public class UserService {
@Autowired
UserMapper userMapper;
public User getUserById(Integer id){
return userMapper.selectByPrimaryKey(id);
}
}
3.UserController.java
package com.springmvc.controller;
import com.springmvc.entity.User;
import com.springmvc.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import java.util.List;
@Controller
@RequestMapping("/user")
public class UserController {
@Autowired
private UserService userService;
@RequestMapping(value="/getUser",method = RequestMethod.GET)
@ResponseBody
public User getUser(Integer id){
User user = userService.getUserById(id);
return user;
}
}
可能报错:
有时候 private UserService userService 加上 @Autowired 会报编译错误,
解决方案:
找到该页面,将 Autowiring for Bean Class √去掉,Apply OK
六.配置Tomcat
1.添加tomcat
最好选择 tomcat7
2.配置Tomcat服务器页签
- Name:tomcat命名;
- Application server:选中本地安装目录;
- JRE:选中本地安装的jdk路径
3.部署页签
点击 Deployment (部署)进入该页面
点击 ‘+’
选中“…:war exploded”;
Application context 可以修改项目访问路径的项目名,如:http://localhost:8080/ssm
4.Apply OK 之后,Tomcat 配置成功;
七.测试
八、可能出现的问题
1.tomcat控制台乱码
解决方案:
1.新增一行
-Dfile.encoding=UTF-8
2.如果1没有解决
setting修改编码
3. 配置tomcat
2.启动 tomcat 出错 / 访问地址404 / 配置应用程序监听器[org.springframework.web.context.ContextLoaderListener]错误
将 tomcat10 换成 tomcat7
3.Mybatis异常“Cannot enable lazy loading because CGLIB is not available. Add CGLIB to your classpath.”
缺少CGLIB,添加依赖到工程中,打开Pom文件,添加依赖
<!-- cglib -->
<dependency>
<groupId>cglib</groupId>
<artifactId>cglib</artifactId>
<version>3.2.5</version>
</dependency>
4.mysql 连接错误 No suitable driver
### Cause: org.springframework.jdbc.CannotGetJdbcConnectionException:
Could not get JDBC Connection; nested exception is java.sql.SQLException:
Connections could not be acquired from the underlying database!] with root cause
java.sql.SQLException: No suitable driver
解决方案:
将 mysql-connector-java-8.0.16.jar包 添加到 jre
完成
将 mysql-connector-java-8.0.16.jar包移动到自己配置系统环境变量的jdk文件下的jre文件中
路径如下:jdk1.8.0_261——>jre——>lib——>ext
ps:下载 mysql 驱动
MySQL :: MySQL Community Downloads
选择平台无关
下载
5.配置了视图解析器之后,如何跳到初始的index.jsp
//方法一
@RequestMapping("/returnIndex")
public String returnIndex(){
return "redirect:/index.jsp";
}
//方法二
@RequestMapping("/returnIndex2")
public void returnIndex2(HttpServletResponse response) throws Exception{
response.sendRedirect("/index.jsp");
}
6.设置IDEA修改html、jsp后立即生效,不用重启项目
原文:设置IDEA修改html、jsp后立即生效,不用重启项目_idea里的项目如何不需要重新构建_技匠而已的博客-CSDN博客
7.前后端数据交互
菜鸟学SpringMVC之——SpringMVC执行原理、向前端返回数据的三种方式_springmvc返回数据给前端_菜鸟琪的博客-CSDN博客
版权归原作者 Show my bug 所有, 如有侵权,请联系我们删除。