Java後臺SSM框架的簡單使用
阿新 • • 發佈：2019-02-19
使用步驟：
Controller類 ---> Service介面（serviceImpl實現Service介面類）-->DAO介面（DaoImpl實現DAO介面類）-->Mapper介面（通過Mybatis實現介面方法）。
Controller類：
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資料 * */ @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 "新增成功"; } @RequestMapping("/deleteUser") @ResponseBody public String delUserById(int id) { service.delUserById(id); return "刪除成功"; } @RequestMapping("/updateUser") @ResponseBody public String updateById(@RequestParam int id,@RequestParam String getpassword) { service.updateUserById(id,getpassword); return "更新完成"; } }
Service介面（serviceImpl實現Service介面類）：
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); }
DAO介面（DaoImpl實現DAO介面類）：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("使用者不存在！"); } 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); } }
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介面（通過Mybatis實現介面方法）：
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);
}
其中用到的實體類：
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對mapper介面的實現
<?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">
<!-- 對映DAO/Mapper介面 -->
<mapper namespace="com.cuboo.mapper.UserMapper" >
<!-- List的返回型別設定 -->
<!-- mybatis的config.xim 配置實體類對映 的alias-->
<resultMap id="UserResultMap" type="User">
<id property="id" column="id"/>
<result property="username" column="username"/>
<result property="password" column="password"/>
</resultMap>
<!-- id dao介面的方法名 parameterType、resultType 分別為dao中介面方法的引數何返回型別-->
<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>
<!-- <update id="updateUserById" parameterType="User">
update t_user set username = #{username},password = #{password}
where id = #{id}
</update> -->
</mapper>