Maven单模块SSM整合

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

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

2 单独搭建Spring环境

2.1 创建Web项目

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

 

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

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

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

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

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:

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

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。

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:

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

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

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。

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

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

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>
<table border="1">
    <tr>
        <td>编号</td>
        <td>用户名</td>
        <td>生日</td>
        <td>性别</td>
        <td>地址</td>
    </tr>
    <!--
    items: 需要需要遍历的集合
    var: 每个对象的变量名称
    -->
    <c:forEach items="${list}" var="user">
        <tr>
            <td>${user.id}</td>
            <td>${user.username}</td>
            <td>${user.birthday}</td>
            <td>${user.sex}</td>
            <td>${user.address}</td>
        </tr>
    </c:forEach>
</table>
</body>
</html>

6.7 最终显示效果如下

 

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

一点教程,一个分享编程知识的公众号。跟着站长一起学习和进步。

通俗易懂,深入浅出,一篇文章只讲一个知识点。

在公交、在地铁、在厕所都可以阅读,随时随地涨姿势。

文章不涉及代码,不烧脑细胞,人人都可以学习。

当你决定关注「一点教程」,你已然超越了90%的程序员!

一点教程二维码