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简单易懂：SSM入门级项目整合实例教程+附项目源码

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一、前言

最快的提升自己的编程水平以及对某个方向的理解和运用，必然是需要动手实践，在不断的Debug中自我折磨，然后放弃！！！（玩笑）

本篇文章只是进行基础的SSM框架（Sping+SpringMVC+Mybatis）的整合的教程，以及其中可能遇到的问题的简单解决办法！因为刚开始起手一个项目，自然需要一个过渡阶段，否则前期将会异常艰难。

** 废话不多说，开始吧！**

全程干货不累赘，开始发车！！

Final Test Result：

二、推荐开发及运行环境

1、系统：Windows10

2、IDE：Interilj ideal 2021.3

3、服务器：Tomacat-8（用高版本对应的Severlet-4.0会启动报错，注意！！）

4、数据库：MySQL5.7

5、浏览器：FireFox

6、JavaKit：JDK18

三、项目基本结构

四、创建一个普通JAVAEE-WEB项目

1、点击File，new，project

2、创建一个JavaEnterpri项目，选择对应JDK，命名为SSM，选择JavaEE8，然后Finish

五、搭建数据库

1、创建SSM数据库和tb_book数据表

create database SSM;
create table tb_book(
id int(11) primary key,
name varchar(20) not null,
press varchar(20) not null,
author varchar(20) not null);

2、插入数据

insert into tb_book(id,name,press,author) values(1,"Moving Earth","人民出版社","刘慈欣");

六、pom.xml引入依赖

代码如下：（复制粘贴即可）

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.example</groupId>
    <artifactId>SSM</artifactId>
    <version>1.0-SNAPSHOT</version>
    <name>SSM</name>
    <packaging>war</packaging>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.target>1.8</maven.compiler.target>
        <maven.compiler.source>1.8</maven.compiler.source>
        <junit.version>5.8.1</junit.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.2.8.RELEASE</version>
        </dependency>
        <!--Spring事务管理-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>5.2.8.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.2.8.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>5.2.8.RELEASE</version>
        </dependency>
        <!--Spring MVC的相关依赖-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.2.8.RELEASE</version>
        </dependency>
        <!--MyBatis相关依赖-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.2</version>
        </dependency>
        <!--MyBatis与Spring整合相关依赖-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.1</version>
        </dependency>
        <!--数据源-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.20</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>4.0.1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.cxf</groupId>
            <artifactId>cxf-rt-frontend-jaxrs</artifactId>
            <version>3.4.5</version>
        </dependency>
        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter-api</artifactId>
            <version>${junit.version}</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter-engine</artifactId>
            <version>${junit.version}</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.2</version>
            <scope>provided</scope>
        </dependency>
        <!-- 数据库驱动相关依赖-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.11</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13</version>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <finalName>SSM</finalName>
        <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
            <plugins>
                <plugin>
                    <artifactId>maven-clean-plugin</artifactId>
                    <version>3.1.0</version>
                </plugin>
                <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->
                <plugin>
                    <artifactId>maven-resources-plugin</artifactId>
                    <version>3.0.2</version>
                </plugin>
                <plugin>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <version>3.8.0</version>
                </plugin>
                <plugin>
                    <artifactId>maven-surefire-plugin</artifactId>
                    <version>2.22.1</version>
                </plugin>
                <plugin>
                    <artifactId>maven-war-plugin</artifactId>
                    <version>3.2.2</version>
                </plugin>
                <plugin>
                    <artifactId>maven-install-plugin</artifactId>
                    <version>2.5.2</version>
                </plugin>
                <plugin>
                    <artifactId>maven-deploy-plugin</artifactId>
                    <version>2.8.2</version>
                </plugin>
            </plugins>
        </pluginManagement>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-war-plugin</artifactId>
                <version>3.3.2</version>
            </plugin>
        </plugins>
        <!-- 如果不添加此节点mybatis的mapper.xml文件都会被漏掉。 -->
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
        </resources>

    </build>

</project>

七、创建实体类

src/main/java下创建com.itheima.domain包，创建Book实体类

1-1Book.java

package com.itheima.domain;
public class Book {
    private Integer id;
    private String name;
    private  String press;
    private  String author;
    public Integer getId()
    {
        return id;
    }
    public void setId(Integer id){
        this.id=id;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getName() {
        return name;
    }
    public void setAuthor(String author) {
        this.author = author;
    }
    public String getAuthor() {
        return author;
    }
    public void setPress(String press) {
        this.press = press;
    }
    public String getPress() {
        return press;
    }
}

八、创建三层架构对应模块的类和接口

src/main/java下创建com.itheima.dao包，创建BookMapper接口

1-2 BookMapper.java

package com.itheima.dao;
import com.itheima.domain.Book;
public interface BookMapper {
         public Book findBookById(Integer id);
}

同目录下创建其映射文件

1-3BookMapper.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.itheima.dao.BookMapper">
    <!--根据id查询图书信息 -->
    <select id="findBookById" parameterType="int"
            resultType="com.itheima.domain.Book">
          select * from tb_book where id = #{id}
      </select>
</mapper>

 src/main/java下创建com.itheima.service包，创建BookService接口

** 1-4 BookService.java**

package com.itheima.service;
import com.itheima.domain.Book;
public interface BookService {
    Book findBookById(Integer id);
}

src/main/java下创建com.itheima.service.Impl包,创建实现类BookServiceImpl

1-5 BookServiceImpl.java

package com.itheima.service.impl;
import com.itheima.dao.BookMapper;
import com.itheima.domain.Book;
import com.itheima.service.BookService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
@Service
public class BookServiceImpl implements BookService {
    @Autowired
    private BookMapper bookMapper;
    public Book findBookById (Integer id)
    {
        return bookMapper.findBookById(id);
    }
}

src/main/java下创建com.itheima.controller包,创建BookController处理器类

1-5 BookController.java

package com.itheima.controller;
import com.itheima.domain.Book;
import com.itheima.service.BookService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
@Controller
public class BookController {
    @Autowired
    private BookService bookService;
    @RequestMapping("/book")
    public ModelAndView findBookById(Integer id)
    {
        Book book=bookService.findBookById(id);
        ModelAndView modelAndView=new ModelAndView();
        modelAndView.setViewName("book.jsp");
        modelAndView.addObject("book",book);
        return modelAndView;
    }
}

九、Spring和Mybatis的整合

1、spring的配置文件：

src/main/resources目录下创建application-service.xml配置文件

2-1 application-service.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: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
        ">
 <context:component-scan base-package="com.itheima.service"/>
</beans>

2、Spring和Mybatis的整合配置

src/main/resources目录下创建属性源文件jdbc.properties,用于配置MySQL数据库

2-2 jdbc.properties

jdbc.driverClassName=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/ssm?useUnicode=true\
  &characterEncoding=utf-8&serverTimezone=Asia/Shanghai
jdbc.username=root
jdbc.password=123456

src/main/resources目录下创建application-dao.xml配置信息

2-3 application-dao.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: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
     ">
    <context:property-placeholder location="classpath:jdbc.properties"/>
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="${jdbc.driverClassName}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
    </bean>
    <bean id="sqlSessionFactory"
          class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
    </bean>
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.itheima.dao"/>
    </bean>
</beans>

3、整合测试

src/test/java中创建BookServiceTest类

2-4BookServiceTest.java

import com.itheima.domain.Book;
import com.itheima.service.BookService;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = {"classpath:application-service.xml","classpath:application-dao.xml"})
public class BookServiceTest {
@Autowired
    private BookService bookService;
@Test
    public void findBookById()
{
    Book book=bookService.findBookById(2);
    System.out.println("id:"+book.getId());
    System.out.println("name:"+book.getName());
    System.out.println("author:"+book.getAuthor());
    System.out.println("press:"+book.getPress());
}
}

4、测试结果

测试成功：

九、Spring和SpringMVC整合

1、Spring的配置

在项目webapp/WEB-INF的web.xml中输入以下代码

3-1 web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">
      <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:application-*.xml</param-value>
      </context-param>
      <listener>
        <listener-class>
          org.springframework.web.context.ContextLoaderListener
        </listener-class>
      </listener>
      <servlet>
        <servlet-name>DispatcherServlet</servlet-name>
        <servlet-class>
          org.springframework.web.servlet.DispatcherServlet
        </servlet-class>
        <init-param>
          <param-name>contextConfigLocation</param-name>
          <param-value>classpath:spring-mvc.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
      </servlet>
      <servlet-mapping>
        <servlet-name>DispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
      </servlet-mapping>
</web-app>

2、SpringMVC的配置

src/main/resources目录下创建Spring-mvc.xml配置信息

3-2 spring-mvc.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       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.xsd
               http://www.springframework.org/schema/context
               http://www.springframework.org/schema/context/spring-context.xsd">
    <context:component-scan base-package="com.itheima.controller"/>
    <mvc:annotation-driven/>
</beans>

3、SSM框架整合测试

src/main/webapp下创建book.jsp文件

3-4 book.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>图书信息查询</title>
</head>
<body>
<table border="1">
<tr>
    <th>图书id</th>
    <th>图书名称</th>
    <th>出版社</th>
    <th>作者</th>
</tr>
<tr>
    <td>${book.id}</td>
    <td>${book.name}</td>
    <td>${book.press}</td>
    <td>${book.author}</td>
</tr>
</table>
</body>
</html>

启动Tomcat8，在浏览器输入

http://localhost:8082/SSM_war_exploded/book?id=1

其中8082为端口号，我的填的是8082，默认是8080，根据自己的配置改就行！

结果：

十、注意事项及其BUG反馈

1、控制台中文乱码解决办法：

Settings->Editor->File Encodings->三个部分如图都改为GBK即可

2、Mysql数据库中文乱码解决办法：

修改数据库字符集 :

alter database SSM default convert to character set utf8;

3、服务器日志中文乱码解决办法：

找到对应的Tomcat-8存储地址，在conf中找到

logging.properties文件，将全部GBk替换成UTF-8即可

4、出现no appropriate protocal 异常报错

找到对应位置jdk，把java.security中的

**dk.tls.disabledAlgorithms=后的SSLv3，TLSv1，TLSv1.1删除，**

如图大概在724行，删除后如图：

5、出现java.lang.NoClassDefFoundError：javax/severlet/报错

是由于Tomcat高版本不支持4.0版本的Sevrlet导致，更换低版本Tomcat即可

十一、总结

** 总体来说，当开始着手一个WEB项目时，总会由于各种原因导致各种BUG，需要花费大量的时间去排查和调试，才能一步步把最后的项目运行出来，因此需要考虑的方面有很多，重要的是必须看懂编译器报错的原因，从而分析出可行的解决办法。**

** 只有不断的鞭策自己去实践和学习，积累Debug的能力和经验，才能慢慢获得进步！**

发文不易，恳请大佬们高抬贵手！

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标签： java mysql SSM
本文转载自: https://blog.csdn.net/m0_55278347/article/details/129711245
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