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SpringMVC学习：二、SSM整合_springmvc需要整合什么

作者：笔触狂放9 | 2024-03-29 11:28:02

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springmvc需要整合什么

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)]

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;

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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>
    <!--添加Spring-mvc的依赖-->
    <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>
    <!--log4j-->
    <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>

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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

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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

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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;

}

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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();
}

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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>

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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">
    <!--加载properties
        如果是多个properties文件, 文件路径与文件路径使用逗号分割   classpath:db.properties,classpath:log4j.properties
      -->
    <context:property-placeholder location="classpath:db.properties" file-encoding="UTF-8"/>
    <!--配置一个C3p0数据源-->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <!--数据库四大参数-->
        <property name="driverClass" value="${jdbc.driverClass}"/>
        <property name="jdbcUrl" value="${jdbc.url}"/>
        <property name="user" value="${jdbc.user}"/>
        <property name="password" value="${jdbc.password}"/>
        <!--连接池相关的参数-->
        <!--初始连接数-->
        <property name="initialPoolSize" value="${jdbc.initialPoolSize}"/>
        <!--增量, 每次创建几个连接-->
        <property name="acquireIncrement" value="${jdbc.acquireIncrement}"/>
        <!--最大连接数-->
        <property name="maxPoolSize" value="${jdbc.maxPoolSize}"/>
        <!--最小连接数 默认值等于初始连接数-->
        <property name="minPoolSize" value="${jdbc.minPoolSize}"/>
    </bean>

    <!--配置SqlSessionFactoryBean-->
    <bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!--注入数据源-->
        <property name="dataSource" ref="dataSource"/>
        <!--配置别名-->
        <property name="typeAliasesPackage" value="com.suke.pojo"/>
        <!--加载sql映射文件  * 任意  一定要注意: classpath*: 如果不写, 后面*无效-->
        <property name="mapperLocations" value="classpath*:mapper/*Mapper.xml"/>
    </bean>


    <!--配置mapper扫描器 扫描指定包下所有的Mapper接口
       创建Mapper接口代理对象, sqlSession.getMapper()并且保存到Spring容器-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!--扫描那个包下Mapper接口-->
        <property name="basePackage" value="com.suke.mapper"/>
        <!--注入SqlSessionFactory-->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactoryBean"/>
    </bean>
</beans>

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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);
    }
}

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测试结果:
在这里插入图片描述

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();
}

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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();
    }
}

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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">
 


    <!--开始扫描注解-->
    <context:component-scan base-package="com.suke.service"/>

    <!--配置声明式事务管理-->
    <!--配置一个事务管理器-->
    <bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <!--配置事务通知-->
    <tx:advice id="txAdvice" transaction-manager="txManager">
        <!--配置事务策略: 对业务层的方法进行怎么样事务管理-->
        <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>

    <!--把事务通知类txAdvice与业务层的类方法进行织入: AOP的技术-->
    <aop:config>
        <!--配置切入点-->
        <aop:pointcut id="mypointcut" expression="execution(* com.suke.service..*.*(..))"/>
        <aop:advisor advice-ref="txAdvice" pointcut-ref="mypointcut"/>
    </aop:config>
</beans>

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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;
    }

}

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springmvc.xml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:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="
			http://www.springframework.org/schema/beans
			http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
			http://www.springframework.org/schema/context
			http://www.springframework.org/schema/context/spring-context-4.3.xsd
        	http://www.springframework.org/schema/mvc
        	http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd">
      <!-- SpringMVC的配置 -->
      <!-- 扫描Controller的注解 -->
      <context:component-scan base-package="com.suke.controller"></context:component-scan>
        	
      <!-- 配置注解的处理器映射器和注解的处理器适配器 -->
      <mvc:annotation-driven/>
      
      <!-- 配置视图解析器 -->
      <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
      	<!-- 配置jsp视图的前缀 -->
      	<property name="prefix" value="/WEB-INF/jsp/" />
      	<!-- 配置jsp视图的后缀 -->
      	<property name="suffix" value=".jsp"/>
      </bean>
        	
</beans>

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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>
  <!-- 加载Spring的配置文件 -->
  <context-param>
  	<param-name>contextConfigLocation</param-name>
  	<param-value>classpath:applicationContext-*.xml</param-value>
  </context-param>
  <!-- 配置Spring的监听器 -->
  <listener>
  	<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  
  <!-- 配置post乱码处理 -->
  <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>

  <!-- 配置SpringMVC的前端控制器 -->
  <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>

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