2021-05-03 10:14  阅读(106)
文章分类:Spring MVC 教程 文章标签:SpringSpring MVC
©  原文作者:一点教程 原文地址:http://www.yiidian.com/springmvc/

本文讲解使用Maven单模块方式进行Spring MVC+Spring+MyBatis整合。为了把整合步骤体现地更加清晰,我们可以把步骤分为以下六个部分:

  1. 准备数据库环境
  2. 单独搭建Spring环境
  3. 单独搭建Spring MVC环境
  4. Spring整合Spring MVC
  5. 单独搭建MyBatis环境
  6. MyBatis整合Spring

1 准备数据库环境

1.1 创建ssm数据库

202105031014411231.png

1.2 建立测试表

    
    CREATE TABLE `user` (
       `id` int(11) NOT NULL AUTO_INCREMENT,
       `username` varchar(32) NOT NULL COMMENT '用户名称',
       `birthday` datetime DEFAULT NULL COMMENT '生日',
       `sex` char(1) DEFAULT NULL COMMENT '性别',
       `address` varchar(256) DEFAULT NULL COMMENT '地址',
       PRIMARY KEY (`id`)
     ) ENGINE=InnoDB AUTO_INCREMENT=49 DEFAULT CHARSET=utf8

1.3 插入测试数据

202105031014413802.png

2 单独搭建Spring环境

2.1 创建Web项目

202105031014415933.png

2.2 导入SSM相关依赖

    
    <?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.yiidian</groupId>  
      <artifactId>ch04_04_springmvc_ssm</artifactId>  
      <version>1.0-SNAPSHOT</version>  
      <packaging>war</packaging>
      <!--
         SSM整合的基础依赖
       -->
      <!-- 1.spring相关的依赖 -->
      <dependencies>
        <!-- 1.1 ioc -->
        <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-context</artifactId>
          <version>5.0.2.RELEASE</version>
        </dependency>
        <!--1.2 aop -->
        <dependency>
          <groupId>org.aspectj</groupId>
          <artifactId>aspectjweaver</artifactId>
          <version>1.8.7</version>
        </dependency>
        <!-- 1.3 声明式事务-->
        <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-tx</artifactId>
          <version>5.0.2.RELEASE</version>
        </dependency>
        <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-jdbc</artifactId>
          <version>5.0.2.RELEASE</version>
        </dependency>
        <!-- 1.4 test -->
        <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-test</artifactId>
          <version>5.0.2.RELEASE</version>
        </dependency>
        <dependency>
          <groupId>junit</groupId>
          <artifactId>junit</artifactId>
          <version>4.12</version>
        </dependency>
    
    
        <!-- 2. mybatis相关依赖 -->
        <!-- 2.1 mysql驱动-->
        <dependency>
          <groupId>mysql</groupId>
          <artifactId>mysql-connector-java</artifactId>
          <version>5.1.46</version>
        </dependency>
        <!-- 2.2 数据源 -->
        <dependency>
          <groupId>com.alibaba</groupId>
          <artifactId>druid</artifactId>
          <version>1.1.6</version>
        </dependency>
        <!-- 2.3 mybatis核心包 -->
        <dependency>
          <groupId>org.mybatis</groupId>
          <artifactId>mybatis</artifactId>
          <version>3.4.5</version>
        </dependency>
    
        <!-- 3. springmvc相关依赖-->
        <!-- 3.1 springmvc核心包 -->
        <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-webmvc</artifactId>
          <version>5.0.2.RELEASE</version>
        </dependency>
        <!--3.2 servlet依赖 -->
        <dependency>
          <groupId>javax.servlet</groupId>
          <artifactId>servlet-api</artifactId>
          <version>2.5</version>
        </dependency>
        <!--3.3 jstl标签库-->
        <dependency>
          <groupId>jstl</groupId>
          <artifactId>jstl</artifactId>
          <version>1.2</version>
        </dependency>
    
        <!-- 4. log4j日志 -->
        <dependency>
          <groupId>log4j</groupId>
          <artifactId>log4j</artifactId>
          <version>1.2.17</version>
        </dependency>
    
        <!-- 5. spring与mybatis整合包 *** -->
        <dependency>
          <groupId>org.mybatis</groupId>
          <artifactId>mybatis-spring</artifactId>
          <version>1.3.1</version>
        </dependency>
      </dependencies>
    </project>
    

2.3 设计Pojo

    
    package com.yiidian.domain;
    
    import java.util.Date;
    
    /**
     * 实体类
     * 一点教程网 - www.yiidian.com
     */
    public class User {
        private Integer id;
        private String username;
        private Date birthday;
        private String sex;
        private String address;
    
        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 Date getBirthday() {
            return birthday;
        }
    
        public void setBirthday(Date birthday) {
            this.birthday = birthday;
        }
    
        public String getSex() {
            return sex;
        }
    
        public void setSex(String sex) {
            this.sex = sex;
        }
    
        public String getAddress() {
            return address;
        }
    
        public void setAddress(String address) {
            this.address = address;
        }
    
        @Override
        public String toString() {
            return "User{" +
                    "id=" + id +
                    ", username='" + username + '\'' +
                    ", birthday=" + birthday +
                    ", sex='" + sex + '\'' +
                    ", address='" + address + '\'' +
                    '}';
        }
    }
    

2.3 编写业务接口和实现

UserService接口:

    
    package com.yiidian.service;
    import com.yiidian.domain.User;
    import java.util.List;
    /**
     * 业务层接口
     * 一点教程网 - www.yiidian.com
     */
    public interface UserService {
        /**
         * 查询所有用户
         */
        public List<User> findAll();
    }
    

UserService实现类:

    
    package com.yiidian.service.impl;
    import com.yiidian.domain.User;
    import com.yiidian.service.UserService;
    import org.springframework.stereotype.Service;
    
    import java.util.List;
    
    /**
     *业务层实现类
     * 一点教程网 - www.yiidian.com
     */
    @Service
    public class UserServiceImpl implements UserService{
        @Override
        public List<User> findAll() {
            System.out.println("查询所有用户...");
            return null;
        }
    }
    

这里给业务实现类加入@Service注解,目的是把该对象放入Spring IOC容器。

2.4 编写Spring配置

202105031014417594.png

内容如下:

    
    <?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">
    
        <!--扫描Service实现类-->
        <context:component-scan base-package="com.yiidian.service"/>
    </beans>

2.5 编写Spring环境测试类

202105031014419685.png

内容如下:

    
    package com.yiidian.test;
    
    import com.yiidian.service.UserService;
    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;
    /**
     * 单独测试Spring环境是否OK
     * 一点教程网 - www.yiidian.com
     */
    @RunWith(SpringJUnit4ClassRunner.class) // 加载Spring环境
    @ContextConfiguration("classpath:applicationContext.xml") //读取spring配置,创建IOC容器
    public class TestSpring {
        //注入service对象
        @Autowired
        private UserService userService;
    
        @Test
        public void testFindAll(){
            userService.findAll();
        }
    }
    

2.6 运行测试类

202105031014421446.png

3 单独搭建Spring MVC环境

3.1 Spring MVC核心控制器

    
    <?xml version="1.0" encoding="UTF-8"?>
    <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    	xmlns="http://java.sun.com/xml/ns/javaee"
    	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
    	version="2.5">
    	
    	<!-- 配置核心控制器 -->
    	<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:springmvc.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>

3.2 springmvc.xml配置

202105031014424007.png

内容如下:

    
    <?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.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">
       
        <!-- 1.扫描控制器 -->
        <context:component-scan base-package="com.yiidian.controller"/>
    
        <!-- 2.视图解析器 -->
        <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
            <property name="prefix" value="/pages/"/>
            <property name="suffix" value=".jsp"/>
        </bean>
    
        <!-- 3.创建处理器映射器和处理器适配器 -->
        <mvc:annotation-driven/>
    </beans>

3.3 编写UserController

    
    package com.yiidian.controller;
    
    import org.springframework.stereotype.Controller;
    import org.springframework.ui.Model;
    import org.springframework.web.bind.annotation.RequestMapping;
    
    /**
     * 控制器
     * 一点教程网 - www.yiidian.com
     */
    @Controller
    @RequestMapping("/user")
    public class UserController {
        /**
         * 查询所有用户
         */
        @RequestMapping("/list")
        public String list(Model model){
            //存入数据到request域
            model.addAttribute("list","用户数据");
            //返回list.jsp页面
            return "list";
        }
    }
    

3.4 编写list.jsp,显示数据

202105031014425728.png

内容如下:

    
    <%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <html>
    <head>
        <title>一点教程网-显示用户数据</title>
    </head>
    <body>
    ${list}
    </body>
    </html>
    

3.5 项目部署到Tomcat

访问Controller:http://localhost:8080/user/list,显示效果如下:

202105031014427469.png

4 Spring整合Spring MVC

4.1 配置Spring监听器

Spring和Spring MVC融合使用,非常简单,只要在web.xml配置监听器,在项目启动的时候,加载applicationContext.xml文件,把Spring环境启动即可。

    
    <!-- 配置spring监听器,用于加载applicationContext.xml(初始化SpringIOC容器) -->
    <context-param>
    	<param-name>contextConfigLocation</param-name>
    	<param-value>classpath:applicationContext.xml</param-value>
    </context-param>

4.2 在控制层调用业务层

    
    package com.yiidian.controller;
    
    import com.yiidian.service.UserService;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Controller;
    import org.springframework.ui.Model;
    import org.springframework.web.bind.annotation.RequestMapping;
    
    /**
     * 控制器
     * 一点教程网 - www.yiidian.com
     */
    @Controller
    @RequestMapping("/user")
    public class UserController {
        @Autowired
        private UserService userService;
        
        /**
         * 查询所有用户
         */
        @RequestMapping("/list")
        public String list(Model model){
            //调用业务层方法
            userService.findAll();
            
            //存入数据到request域
            model.addAttribute("list","用户数据");
            //返回list.jsp页面
            return "list";
        }
    }
    

如果Controller成功注入Service,代表Spring与Spring MVC整合成功!

4.3 测试

2021050310144295010.png

5 单独搭建MyBatis环境

5.1 编写UserDao接口

    
    package com.yiidian.dao;
    import com.yiidian.domain.User;
    import org.apache.ibatis.annotations.Select;
    
    import java.util.List;
    
    /**
     * Dao接口
     */
    public interface UserDao {
        /**
         * 查询所有账户
         */
        @Select("select * from user")
        public List<User> findAll();
    }
    

5.2 编写SqlMapConfig.xml

该文件是MyBatis核心配置,里面配置数据源及Dao接口映射等信息。

2021050310144321811.png

内容如下:

    
    <?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>
    
        <!-- 读取jdbc.properties -->
        <properties resource="jdbc.properties"/>
    
        <!--1.别名扫描 -->
        <typeAliases>
            <package name="com.yiidian.domain"/>
        </typeAliases>
    
        <!--2.数据库连接 -->
        <environments default="mysql">
            <environment id="mysql">
                <transactionManager type="jdbc"></transactionManager>
                <dataSource type="pooled">
                    <property name="url" value="${jdbc.url}"/>
                    <property name="driver" value="${jdbc.driver}"/>
                    <property name="username" value="${jdbc.username}"/>
                    <property name="password" value="${jdbc.password}"/>
                </dataSource>
            </environment>
        </environments>
    
        <!--3.映射关联 -->
        <mappers>
            <package name="com.yiidian.dao"/>
        </mappers>
    
    </configuration>
    

jdbc.properties:

2021050310144343712.png

内容如下:

    
    jdbc.driver=com.mysql.jdbc.Driver
    jdbc.url=jdbc:mysql://localhost:3306/ssm?characterEncoding=utf8
    jdbc.username=root
    jdbc.password=root
    jdbc.initialSize=3
    jdbc.maxActive=10

5.3 编写MyBatis测试类

2021050310144362313.png

内容如下:

    
    package com.yiidian.test;
    
    import com.yiidian.dao.UserDao;
    import com.yiidian.domain.User;
    import org.apache.ibatis.io.Resources;
    import org.apache.ibatis.session.SqlSession;
    import org.apache.ibatis.session.SqlSessionFactory;
    import org.apache.ibatis.session.SqlSessionFactoryBuilder;
    import org.junit.Test;
    
    import java.io.IOException;
    import java.io.InputStream;
    import java.util.List;
    
    /**
     * 单独测试MyBatis环境是否OK
     *一点教程网 - www.yiidian.com
     */
    public class TestMyBatis {
        @Test
        public void testFindAll() throws IOException {
    
            //1.加载SqlMapConfig.xml
            InputStream in = Resources.getResourceAsStream("SqlMapConfig.xml");
    
            //2.创建SqlSessionFactory
            SqlSessionFactoryBuilder builder = new SqlSessionFactoryBuilder();
            SqlSessionFactory factory = builder.build(in);
    
            //3.创建SqlSession
            SqlSession sqlSession = factory.openSession();
    
            //4.创建Dao代理对象
            UserDao accountDao = sqlSession.getMapper(UserDao.class);
    
            //5.执行方法
            List<User> list = accountDao.findAll();
            System.out.println(list);
    
            //6.释放资源
            sqlSession.close();
            in.close();
    
        }
    }
    

5.4 运行测试类

2021050310144379714.png

6 MyBatis整合Spring

MyBatis整合Spring是SSM整合最关键的一步!毕竟MyBatis和Spring是两个不同框架。整合的思路是:Spring依赖IOC容器创建MyBatis所需要的SqlSessionFactory,从利用SqlSessionFactory完成Dao层的操作。我们来具体步骤:

6.1 MyBatis整合Spring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">
    
        <!--扫描Service实现类-->
        <context:component-scan base-package="com.yiidian.service"/>
    
        <!-- 1. 创建数据源 -->
        <context:property-placeholder location="classpath:jdbc.properties"/>
        
        <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
            <property name="url" value="${jdbc.url}"/>
            <property name="driverClassName" value="${jdbc.driver}"/>
            <property name="username" value="${jdbc.username}"/>
            <property name="password" value="${jdbc.password}"/>
        </bean>
    
        <!-- 2. 为了创建Dao代理对象,先创建SqlSessionFactory对象 -->
        <!--  SqlSessionFactoryBean: 创建SqlSessionFactory对象的工具 -->
        <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
            <!-- 注入数据源 -->
            <property name="dataSource" ref="dataSource"/>
        </bean>
    
        <!-- 3. 扫描Dao接口所在包,扫描后用于创建Dao代理对象,把代理对象放入IOC容器 -->
        <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
            <!-- Dao扫描目录 -->
            <property name="basePackage" value="com.yiidian.dao"/>
        </bean>
    </beans>

因为Spring已经把之前MyBatis的数据源及Dao映射等信息都集成了,所以MyBatis的SqlMapConfig.xml已经不需要啦,可以删除。

2021050310144400715.png

6.2 业务层注入持久层对象

上面的配置已经成功地让MyBatis和Spring完成整合。接着,我们可以在Service层注入Dao对象,调用其方法:

    
    package com.yiidian.service.impl;
    import com.yiidian.dao.UserDao;
    import com.yiidian.domain.User;
    import com.yiidian.service.UserService;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Service;
    import java.util.List;
    
    /**
     *业务层实现类
     * 一点教程网 - www.yiidian.com
     */
    @Service
    public class UserServiceImpl implements UserService{
        //注入Dao对象
        @Autowired
        private UserDao userDao;
        @Override
        public List<User> findAll() {
            return userDao.findAll();
        }
    }
    

6.3 编写测试类

2021050310144423916.png

内容如下:

    
    package com.yiidian.test;
    
    import com.yiidian.service.UserService;
    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;
    
    /**
     * 测试Spring与MyBatis环境是否OK
     * 一点教程网 - www.yiidian.com
     */
    @RunWith(SpringJUnit4ClassRunner.class)
    @ContextConfiguration(value = "classpath:applicationContext.xml")
    public class TestSpringMyBatis {
    
        //从IOC容器中获取业务实现
        @Autowired
        private UserService userService;
    
        @Test
        public void testFindAll(){
            System.out.println( userService.findAll());
        }
    
    }
    

6.4 运行测试

2021050310144442317.png

至此,SSM框架已经整合完成。剩下就是把数据显示到JSP页面上。

6.5 修改UserController类

    
    package com.yiidian.controller;
    
    import com.yiidian.domain.User;
    import com.yiidian.service.UserService;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Controller;
    import org.springframework.ui.Model;
    import org.springframework.web.bind.annotation.RequestMapping;
    
    import java.util.List;
    
    /**
     * 控制器
     * 一点教程网 - www.yiidian.com
     */
    @Controller
    @RequestMapping("/user")
    public class UserController {
        @Autowired
        private UserService userService;
    
        /**
         * 查询所有用户
         */
        @RequestMapping("/list")
        public String list(Model model){
            //调用业务层方法
            List<User> list = userService.findAll();
    
            //存入数据到request域
            model.addAttribute("list",list);
            //返回list.jsp页面
            return "list";
        }
    }
    

6.6 修改JSP页面显示内容

    
    <%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
    <html>
    <head>
        <title>一点教程网-显示用户数据</title>
    </head>
    <body>
    <h3>用户列表</h3>
    | 编号|用户名|生日|性别|地址|
| :-----: | :-----: | :-----: | :-----: | :-----: | 
| 编号 | 用户名 | 生日 | 性别 | 地址 | 
| ${user.id} | ${user.username} | ${user.birthday} | ${user.sex} | ${user.address} | 

    </body>
    </html>
    

6.7 最终显示效果如下

2021050310144467618.png

源码下载:https://pan.baidu.com/s/1BB4_qVMpIiWzEm-aMleJ0Q

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