SpringMVC学习：二、SSM整合

Bertha 。 2023-10-04 20:19 3阅读 0赞

### 3. SSM 整合 ###

#### 3.1 需求 ####

> 使用SpringMVC和MyBatis完成用户管理系统.

#### 3.2 整合思路 ####

spring+springmvc+mybaits的系统架构：

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-Do6pB16F-1670923037618)(assets/image-20220820104445840.png)\]][img-Do6pB16F-1670923037618_assets_image-20220820104445840.png]

> **步骤**:
> 
> 第一步：整合dao层
> 
> mybatis和spring整合，通过spring管理mapper接口。
> 
> 使用mapper的扫描器自动扫描mapper接口在spring中进行注册。
> 
> --------------------
> 
> 第二步：整合service层
> 
> 通过spring管理 service接口。
> 
> 使用配置方式将service接口配置在spring配置文件中。
> 
> 实现事务控制。
> 
> --------------------
> 
> 第三步：整合springmvc
> 
> 由于springmvc是spring的模块，不需要整合。

#### 3.3 环境准备 ####

表:

CREATE TABLE `tb_userinfo` (
      `id` INT(11) UNSIGNED NOT NULL AUTO_INCREMENT COMMENT '用户编号',
      `name` VARCHAR(50) COLLATE utf8mb4_bin NOT NULL COMMENT '用户名称',
      `gender` CHAR(2) COLLATE utf8mb4_bin NOT NULL DEFAULT '男' COMMENT '用户性别',
      `age` INT(10) UNSIGNED DEFAULT NULL COMMENT '用户年龄',
      `address` VARCHAR(20) COLLATE utf8mb4_bin NOT NULL COMMENT '用户籍贯',
      `email` VARCHAR(50) COLLATE utf8mb4_bin NOT NULL COMMENT '用户邮箱',
      `qq` VARCHAR(20) COLLATE utf8mb4_bin DEFAULT NULL COMMENT '用户QQ',
      `photo` VARCHAR(200) COLLATE utf8mb4_bin DEFAULT NULL COMMENT '用户头像',
      PRIMARY KEY (`id`)
    ) ENGINE=INNODB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin;

依赖:

<properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
        <spring.version>5.2.15.RELEASE</spring.version>
      </properties>
    
      <dependencies>
        
        <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-webmvc</artifactId>
          <version>${spring.version}</version>
        </dependency>
        <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-aspects</artifactId>
          <version>${spring.version}</version>
        </dependency>
        <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-orm</artifactId>
          <version>${spring.version}</version>
        </dependency>
    	<dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-test</artifactId>
          <version>${spring.version}</version>
        </dependency>
        <dependency>
          <groupId>org.mybatis</groupId>
          <artifactId>mybatis</artifactId>
          <version>3.5.7</version>
        </dependency>
        <dependency>
          <groupId>org.mybatis</groupId>
          <artifactId>mybatis-spring</artifactId>
          <version>2.0.6</version>
        </dependency>
    
        <dependency>
          <groupId>javax.servlet</groupId>
          <artifactId>javax.servlet-api</artifactId>
          <version>3.0.1</version>
          <scope>provided</scope>
        </dependency>
        <dependency>
          <groupId>mysql</groupId>
          <artifactId>mysql-connector-java</artifactId>
          <version>8.0.30</version>
        </dependency>
        <dependency>
          <groupId>com.mchange</groupId>
          <artifactId>c3p0</artifactId>
          <version>0.9.5.2</version>
        </dependency>
        <dependency>
          <groupId>junit</groupId>
          <artifactId>junit</artifactId>
          <version>4.12</version>
          <scope>test</scope>
        </dependency>
        
        <dependency>
          <groupId>org.slf4j</groupId>
          <artifactId>slf4j-log4j12</artifactId>
          <version>1.7.36</version>
        </dependency>
        <dependency>
          <groupId>com.fasterxml.jackson.core</groupId>
          <artifactId>jackson-databind</artifactId>
          <version>2.13.3</version>
        </dependency>
        <dependency>
          <groupId>org.projectlombok</groupId>
          <artifactId>lombok</artifactId>
          <version>1.18.4</version>
          <scope>compile</scope>
        </dependency>
        <dependency>
          <groupId>org.projectlombok</groupId>
          <artifactId>lombok</artifactId>
          <version>1.18.24</version>
        </dependency>
      </dependencies>

log4j.properties日志配置文件:

log4j.rootCategory=DEBUG, stdout
    
    log4j.appender.stdout=org.apache.log4j.ConsoleAppender
    log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
    log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %t %c{2}:%L - %m%n

数据库配置文件: db.properties

jdbc.driverClass=com.mysql.cj.jdbc.Driver
    jdbc.url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai
    jdbc.user=root
    jdbc.password=123
    
    #当连接池中的连接耗尽的时候c3p0一次同时获取的连接数。Default: 3
    jdbc.acquireIncrement=5
    #初始化时获取的连接数，取值应在minPoolSize与maxPoolSize之间。Default: 3
    jdbc.initialPoolSize=5
    #连接池中保留的最小连接数。
    jdbc.minPoolSize=3
    #连接池中保留的最大连接数。Default: 15
    jdbc.maxPoolSize=10

#### 3.4 整合Mybatis ####

编写Mapper接口

User.java

import lombok.Data;
    
    @Data
    public class User {
        
        private Integer id;
        private String name;
        private String gender;
        private Integer age;
        private String address;
        private String email;
        private String qq;
        private String photo;
    
    }

UserMapper.java

import org.springframework.stereotype.Repository;
    
    @Repository
    public interface UserMapper {
        
        public void insert(User user);
        public void delete(int id);
        public User selectById(int id);
        public List<User> selectAll();
    }

对应的UserMapper.xml文件:

<?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.suke.mapper.UserMapper">
        <select id="selectById" resultType="User">
            select * from tb_userinfo where id = #{id}
        </select>
        <select id="selectAll" resultType="User">
            select * from tb_userinfo
        </select>
        <insert id="insert" parameterType="User">
            <selectKey resultType="int" order="AFTER" keyProperty="id">
                SELECT LAST_INSERT_ID()
            </selectKey>
            insert into tb_userinfo(name,gender,age,address,email,qq,photo)
            values(#{name,jdbcType=VARCHAR},#{gender,jdbcType=VARCHAR},#{age,jdbcType=INTEGER},#{address,jdbcType=VARCHAR}
            ,#{email,jdbcType=VARCHAR},#{qq,jdbcType=VARCHAR},#{photo,jdbcType=VARCHAR})
        </insert>
    
        <delete id="delete">
            delete from tb_userinfo where id = #{id}
        </delete>
    
    </mapper>

> 注意:我们所有的Sql映射文件都放在 src/main/resources/mapper目录下

添加一个applicationContext-mapper.xml配置文件:

> **配置：**
> 
>  *  数据源
>  *  SqlSessionFactory
>  *  mapper扫描器

<?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
           https://www.springframework.org/schema/context/spring-context.xsd">
        
        <context:property-placeholder location="classpath:db.properties" file-encoding="UTF-8"/>
        
        <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
            
            <property name="driverClass" value="${jdbc.driverClass}"/>
            <property name="jdbcUrl" value="${jdbc.url}"/>
            <property name="user" value="${jdbc.user}"/>
            <property name="password" value="${jdbc.password}"/>
            
            
            <property name="initialPoolSize" value="${jdbc.initialPoolSize}"/>
            
            <property name="acquireIncrement" value="${jdbc.acquireIncrement}"/>
            
            <property name="maxPoolSize" value="${jdbc.maxPoolSize}"/>
            
            <property name="minPoolSize" value="${jdbc.minPoolSize}"/>
        </bean>
    
        
        <bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
            
            <property name="dataSource" ref="dataSource"/>
            
            <property name="typeAliasesPackage" value="com.suke.pojo"/>
            
            <property name="mapperLocations" value="classpath*:mapper/*Mapper.xml"/>
        </bean>
    
    
        
        <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
            
            <property name="basePackage" value="com.suke.mapper"/>
            
            <property name="sqlSessionFactoryBeanName" value="sqlSessionFactoryBean"/>
        </bean>
    </beans>

编写测试类:

UserMapperTest.java

import com.suke.pojo.User;
    import lombok.extern.slf4j.Slf4j;
    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;
    
    import static org.junit.Assert.*;
    
    @RunWith(SpringJUnit4ClassRunner.class)
    @ContextConfiguration("classpath:applicationContext-mapper.xml")
    @Slf4j
    public class UserMapperTest {
        
        @Autowired
        private  UserMapper userMapper;
    
        @Test
        public void selectById() {
        
            User user = userMapper.selectById(1);
            log.info("用户信息:{}",user);
        }
    }

测试结果:  
![在这里插入图片描述][4a60e7e5e0b242aca82cac1088cbbfc0.png]

#### 3.5 整合Service ####

编写UserService接口以及实现类

UserService.java

public interface UserService {
        
        public void addUser(User user);
    
        public void deleteUser(Integer uid);
    
        public User queryById(Integer uid);
        
        public List<User> queryAll();
    }

UserServiceImpl.java

@Service("userService")
    public class UserServiceImpl implements UserService {
        
        @Autowired
        private UserMapper userMapper;
    
        @Override
        public void addUser(User user) {
        
            userMapper.insert(user);
        }
    
        @Override
        public void deleteUser(Integer uid) {
        
            if(uid == null){
        
               throw new RuntimeException("id不能为空!");
            }
            userMapper.delete(uid);
        }
    
        @Override
        public User queryById(Integer uid) {
        
            if(uid == null){
        
                throw new RuntimeException("id不能为空!");
            }
            return userMapper.selectById(uid);
        }
        @Override
        public List<User> queryAll(){
        
            return userMapper.selectAll();
        }
    }

添加一个applicationContext-service.xml配置文件:

<?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" xmlns:tx="http://www.springframework.org/schema/tx"
           xmlns:aop="http://www.springframework.org/schema/aop"
           xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans.xsd
           http://www.springframework.org/schema/context
           https://www.springframework.org/schema/context/spring-context.xsd 		  http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/aop https://www.springframework.org/schema/aop/spring-aop.xsd">
     
    
    
        
        <context:component-scan base-package="com.suke.service"/>
    
        
        
        <bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
            <property name="dataSource" ref="dataSource"/>
        </bean>
    
        
        <tx:advice id="txAdvice" transaction-manager="txManager">
            
            <tx:attributes>
                <tx:method name="query*" read-only="true" propagation="SUPPORTS"/>
                <tx:method name="find*" read-only="true" propagation="SUPPORTS"/>
                <tx:method name="select*" read-only="true" propagation="SUPPORTS"/>
                <tx:method name="add*" rollback-for="java.lang.Exception"/>
                <tx:method name="update*" rollback-for="java.lang.Exception"/>
                <tx:method name="del*" rollback-for="java.lang.Exception"/>
                <tx:method name="*" rollback-for="java.lang.Exception"/>
            </tx:attributes>
        </tx:advice>
    
        
        <aop:config>
            
            <aop:pointcut id="mypointcut" expression="execution(* com.suke.service..*.*(..))"/>
            <aop:advisor advice-ref="txAdvice" pointcut-ref="mypointcut"/>
        </aop:config>
    </beans>

#### 3.6 整合SpringMVC ####

> SpringMVC是Spring框架的一个子模块,所以我们不需要进行任何整合,只需要把SpringMVC引入到项目即可

编写UserController.java

@RestController
    @RequestMapping("user")
    public class UserController {
        
        @Autowired
        private UserService userService;
    
        @RequestMapping("queryAll")
        public ModelAndView queryAll(){
        
            ModelAndView modelAndView = new ModelAndView();
            List<User> users = userService.queryAll();
            modelAndView.addObject("users",users);
            modelAndView.setViewName("list");
            return modelAndView;
        }
    
    }

**springmvc.xml文件**

#### 3.7 Spring与Web的整合 ####

加载spring容器，配置springmvc前置控制器。在web.xml文件中进行配置

<?xml version="1.0" encoding="UTF-8"?>
    <web-app version="3.0" 
    	xmlns="http://java.sun.com/xml/ns/javaee" 
    	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
    	http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
      <display-name></display-name>	
      <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
      </welcome-file-list>
      
      <context-param>
      	<param-name>contextConfigLocation</param-name>
      	<param-value>classpath:applicationContext-*.xml</param-value>
      </context-param>
      
      <listener>
      	<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
      </listener>
      
      
      <filter>
      	<filter-name>CharacterEncodingFilter</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>CharacterEncodingFilter</filter-name>
      	<url-pattern>/*</url-pattern>
      </filter-mapping>
    
      
      <servlet>
      	<servlet-name>springmvc</servlet-name>
      	<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
      	<init-param>
      		<param-name>contextConfigLocation</param-name>
      		<param-value>classpath:springmvc.xml</param-value>
      	</init-param>
      	<load-on-startup>1</load-on-startup>
      </servlet>
      
      <servlet-mapping>
      	<servlet-name>springmvc</servlet-name>
      	<url-pattern>/</url-pattern>
      </servlet-mapping>
      
    </web-app>

[img-Do6pB16F-1670923037618_assets_image-20220820104445840.png]: https://img-blog.csdnimg.cn/c35259001b2247d5a3e950919c3e0f26.png
[4a60e7e5e0b242aca82cac1088cbbfc0.png]: https://img-blog.csdnimg.cn/4a60e7e5e0b242aca82cac1088cbbfc0.png