springMVC框架开发笔记 lesson4 SSM实例

springMVC开发实例

 省去配置文件（见上一节）

dao层

IUserDao接口

public interface IUserDao {

public void save(User u);

public void delete(int id);

public List<User> findAll();

}

UserDaoImpl实现类

public class UserDaoImpl extends SqlSessionDaoSupport implements IUserDao {

public void save(User u) {

this.getSqlSession().insert("day01.insertOne", u); 

}

public void delete(int id) {

this.getSqlSession().delete("day01.deleteOne", id);

}

public List<User> findAll() {

List<User> users = this.getSqlSession().selectList("day01.selectAll");

return users;

}

}

entity

public class User implements Serializable{

private int id;

private String username;

private String email;

private int age;

省略无参构造和get，set方法

}

handler

@Controller

public class UserHandler {

@Autowired

private IUserService userService;

@RequestMapping(value="list.action")

public ModelAndView  list(){

ModelAndView mav = new ModelAndView();

List<User> list = userService.findAll();

mav.addObject("list", list);

mav.setViewName("list");

return mav;

}

@RequestMapping(value="add.action",method={RequestMethod.GET,RequestMethod.POST})

public String add(String username,String email,int age){

User u = new User(username,email,age);

userService.saveUser(u);

return "redirect:/list.action";

}

@RequestMapping(value="delete.action")

public String delete(int id){

userService.deleteUser(id);

return "forward:/list.action";

}

public void setUserService(IUserService userService) {

this.userService = userService;

}

}

mapper

Usermapper

<?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="day01">

<insert id="insertOne"  parameterType="User" useGeneratedKeys="true" keyProperty="id">

insert into user_myc(username,email,age) values(#{username},#{email},#{age})

</insert>

<select id="selectAll" resultType="User">

select * from user_myc

</select>

<delete id="deleteOne" parameterType="int">

delete from user_myc where id=#{value}

</delete>

</mapper>

service

IUserService接口

public interface IUserService {

public void saveUser(User u);

public void deleteUser(int id);

public List<User> findAll();

}

UserServiceImpl

public class UserServiceImpl implements IUserService {

private IUserDao userDao;

public void saveUser(User u) {

System.out.println("userDao="+userDao);

userDao.save(u);

}

public List<User> findAll() {

return userDao.findAll();

}

public void setUserDao(IUserDao userDao) {

this.userDao = userDao;

}

public UserServiceImpl() {

}

public UserServiceImpl( IUserDao userDao) {

this.userDao = userDao;

}

public void deleteUser(int id) {

userDao.delete(id);

}

}