SSM框架集成.上（供自己练习查阅用）

Posted 2022-04-05 zhangxiong-tianxiadiyi

1.创建项目

2.准备相关依赖包

  2.1   spring相关jar包

        

   2.2   springMVC相关jar包

         

   2.3 mybatis 相关jar包

       

    2.4mybatis 和spring集成的桥梁包

  

    2.5数据库驱动包和连接池

   

   

    2.6 jstl 标签库依赖包

   

     2.7 mybatis支持的日志包

  

3.配置文件准备

  

4.mapper层（dao层代码）

public interface UserMapper 
    
    int insert(User user);
    
    User selectByPrimaryKey(Integer id);
    
    
    List<User> selectList();
    
    int delteByPrimaryKey(Integer id);    

   mapper.xml 配置文件代码

 

<?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="cn.zj.ssm.mapper.UserMapper">
    
    <insert id="insert" parameterType="cn.zj.ssm.pojo.User">
        insert into user (name,password,age)values(#name,#password,#age)
    </insert>
    
    <select id="selectByPrimaryKey" parameterType="Integer" resultType="cn.zj.ssm.pojo.User">
        select * from user where id = #id
    </select>
<select id="selectList"  resultType="cn.zj.ssm.pojo.User">
        select * from user
    </select>
      
      <delete id="delteByPrimaryKey" parameterType="int">
          delete from user where id = #id
      </delete>
      
</mapper>

5.service层代码

 

@Service
public class UserServiceImpl implements UserService 
    /*
     * 问题： UserMapper 代理对象如何创建？
     * 答 ：使用 SqlSession 操作对象创建 !
     * 
     * 问题 ： SqlSession 对象如何创建？
     *  
     * 答 : SqlSessionFactory 工厂对象创建？
     * 
     * 问题： SqlSessionFactory 对象如何创建
          * 1，和Spring框架集成之前
     *  MyBatis框架自己读取配置文件中的相关配置去创建
     * 2， 和Spring框架集成之后
     *  交个Spring容器来创建
     * 问题： 如何在Spring框架中配置，创建出来SqlSessionFactory对象？
     *  mybatis和spring集成的类查阅 桥梁包
     *  org.mybatis.spring.SqlSessionFactoryBean 创建 SqlSessionFactory
     * 
     */
    @Autowired
    private UserMapper mapper;
    
    @Override
    public int insert(User user) 
        return mapper.insert(user);
    

    @Override
    public User selectByPrimaryKey(Integer id) 
        System.out.println(mapper);
        return mapper.selectByPrimaryKey(id);
    

    @Override
    public List<User> selectList() 
        return mapper.selectList();
    

    @Override
    public int delteByPrimaryKey(Integer id) 
        return mapper.delteByPrimaryKey(id);
    

6.测试代码

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:spring.xml")
public class UserServiceTest 
    
    @Autowired
    private UserService service;

    @Test
    public void testInsert() 
        User user = new User(null, "乔峰", "qiaofeng", 30);
        int row = service.insert(user);
        System.out.println(row);
        
    
@Test
    public void testSelectByPrimaryKey() 
        User user = service.selectByPrimaryKey(8);
        System.out.println(user);
    
    
    @Test
    public void testSelectList() throws Exception 
        List<User> users = service.selectList();
        
        for (User user : users) 
            System.out.println(user);
        
    

7.applicationContext.xml配置文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:p="http://www.springframework.org/schema/p"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:tx="http://www.springframework.org/schema/tx"
    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/context
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd
        http://www.springframework.org/schema/tx
        http://www.springframework.org/schema/tx/spring-tx.xsd
        ">
    
    
    <!-- 设置注解配置包扫描位置 -->
    <context:component-scan base-package="cn.zj.mybatis"/>

</beans>