Java后台SSM框架的简单使用

悠悠 2022-07-15 07:27 213阅读 0赞

使用步骤：

Controller类 ---> Service接口（serviceImpl实现Service接口类）-->DAO接口（DaoImpl实现DAO接口类）-->Mapper接口（通过Mybatis实现接口方法）。

Controller类：

package com.cuboo.controller;
    import java.util.List;
    import javax.annotation.Resource;
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestParam;
    import org.springframework.web.bind.annotation.ResponseBody;
    import com.cuboo.entity.User;
    import com.cuboo.service.JsonService;
    
    /**
     * 
     * @author cuboo
     * 返回Json数据
     *
     */
    
    @Controller
    public class JsonController {
    	
    	@Resource
    	JsonService service;
    	
    	@ResponseBody
    	@RequestMapping("/getJson")
    	public User getUserInfo(){
    		User user = new User();
    		user.setPassword("123456789");
    		user.setUsername("jsondataset");
    		return user;
    	}
    	
    	
    	@RequestMapping("/getUserJson")
    	@ResponseBody
    	public User getUser(@RequestParam String getusername){
    		User user = new User();
    		try {
    			user = service.getInfoByName(getusername);
    		} catch (Exception e) {
    		   e.printStackTrace();
    		}
    		return user;
    	}
        
    	@RequestMapping("/getAllUserJson")
    	@ResponseBody
    	public List<User> getAllUser() {
    	
    		return service.getAllUser();
    	}
    	
    	@RequestMapping("/addUser")
    	@ResponseBody
    	public String addUsers(@RequestParam int id,@RequestParam String getusername
    			,@RequestParam String getpassword){
    		service.addoneUser(id,getusername,getpassword);
    		return "添加成功";
    	}
    	
    	@RequestMapping("/deleteUser")
    	@ResponseBody
    	public String delUserById(int id) {
    		service.delUserById(id);
    		return "删除成功";
    	}
    	
    	@RequestMapping("/updateUser")
    	@ResponseBody
    	public String updateById(@RequestParam int id,@RequestParam String getpassword) {
    		service.updateUserById(id,getpassword);
    		return "更新完成";
    	}
    }

Service接口（serviceImpl实现Service接口类）：

package com.cuboo.service;
    
    import java.util.List;
    
    import com.cuboo.entity.User;
    
    public interface JsonService {
    	
    	public User getInfoByName(String username) throws Exception;
    	public List<User> getAllUser();
    	public void addoneUser(int id,String getusername,String getpassword);
    	public void delUserById(int id); 
    	public void updateUserById(int id,String password); 
    }

package com.cuboo.service;
    
    import java.util.List;
    
    import javax.annotation.Resource;
    
    import org.springframework.stereotype.Service;
    import org.springframework.web.bind.annotation.RequestParam;
    
    import com.cuboo.dao.UserDao;
    import com.cuboo.entity.User;
    
    @Service
    public class JsonServiceImpl implements JsonService{
        @Resource
        UserDao dao;
        
        @Override
    	public User getInfoByName(String username) throws Exception {
    		User user = dao.getInfoByUserName(username);
    		if (user == null) {
    			throw new Exception("用户不存在！");
    		}
    		return user;
    	}
        @Override
    	public List<User> getAllUser() {
    		return dao.getAllUserinfo();
    	}
        @Override
    	public void addoneUser(int id,String getusername,String getpassword) {
    		User user = new User();
    		user.setId(id);
    		user.setUsername(getusername);
    		user.setPassword(getpassword);
    		dao.addUser(user);
    	}
        @Override
    	public void delUserById(int id) {
    		dao.deleteUserById(id);
    	}
        @Override
    	public void updateUserById(int id,String password) {
    		User user = new User();
    		user.setId(id);
    		user.setPassword(password);
    		dao.updateUserById(user);
    	}
    }

DAO接口（DaoImpl实现DAO接口类）：

package com.cuboo.dao;
    
    
    import java.util.List;
    
    import org.springframework.stereotype.Repository;
    
    import com.cuboo.entity.User;
    
    public interface UserDao {
    
    	public User getInfoByUserName(String username);
    	public List<User> getAllUserinfo();
    	public void addUser(User user);
    	public void deleteUserById(int id);
    	public void updateUserById(User user);
    	
    }

package com.cuboo.dao;
    
    import java.util.List;
    
    import javax.annotation.Resource;
    
    import org.springframework.stereotype.Repository;
    
    import com.cuboo.entity.User;
    import com.cuboo.mapper.UserMapper;
    
    @Repository
    public class UserDaoImpl implements UserDao{
    	@Resource
    	UserMapper mapper;
    
    	@Override
    	public User getInfoByUserName(String username) {
    		
    		return mapper.getInfoByUserName(username);
    	}
    
    	@Override
    	public List<User> getAllUserinfo() {
    		
    		return mapper.getAllUserinfo();
    	}
    
    	@Override
    	public void addUser(User user) {
    		mapper.addUser(user);
    		
    	}
    
    	@Override
    	public void deleteUserById(int id) {
    		
    		mapper.deleteUserById(id);
    	}
    
    	@Override
    	public void updateUserById(User user) {
    	
    		mapper.updateUserById(user);
    		
    	}
    
    }

Mapper接口（通过Mybatis实现接口方法）：

package com.cuboo.mapper;
    
    public interface BaseMapper {
    
    }

package com.cuboo.mapper;
    
    import java.util.List;
    
    import com.cuboo.entity.User;
    
    public interface UserMapper extends BaseMapper{
    	
    	public User getInfoByUserName(String username);
    	public List<User> getAllUserinfo();
    	public void addUser(User user);
    	public void deleteUserById(int id);
    	public void updateUserById(User user);
    }

其中用到的实体类：

package com.cuboo.entity;
    
    import java.io.Serializable;
    
    public class User implements Serializable  {
    	/**
    	 * 
    	 */
    	private static final long serialVersionUID = 8261353151151101737L;
    	private Integer id;
    	private String username;
    	private String password;
    	
    	public String getUsername() {
    		return username;
    	}
    	public void setUsername(String username) {
    		this.username = username;
    	}
    	public String getPassword() {
    		return password;
    	}
    	public void setPassword(String password) {
    		this.password = password;
    	}
    	public Integer getId() {
    		return id;
    	}
    	public void setId(Integer id) {
    		this.id = id;
    	}
    	
    
    }

Mybatis对mapper接口的实现

<?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.cuboo.mapper.UserMapper" >
         
          
        <resultMap id="UserResultMap" type="User">
            <id property="id" column="id"/>
            <result property="username" column="username"/>
            <result property="password" column="password"/>
        </resultMap>
        
          
        <select id="getInfoByUserName" parameterType="String" resultType="User">
            select * from t_user where username = #{username}
        </select>
        
        <select id="getAllUserinfo" resultType="UserResultMap">
            select * from t_user
        </select>
        
       <insert id="addUser" parameterType="User">
            insert into t_user(id,username,password)
            values (#{id},#{username},#{password})
        </insert> 
        
        <delete id="deleteUserById" parameterType="int" >
            delete from  t_user where id = #{id}
        </delete>
         <update id="updateUserById" parameterType="User">
            update t_user set password = #{password}
            where id = #{id}
        </update>
        
       
    </mapper>

具体的相关代码和配置文件及jar包详见下载链接：