springboot restful jpa

1 实体类public class User { /** 编号 / private int id; /* 姓名 / private String name; /* 年龄 / private int age; public User(){ }// getter和 setter 略 }2 DAO层编写@Mapperpublic interface UserDao { /* * 用户数据新增 / @Insert(“insert into t_user(id,name,age) values (#{id},#{name},#{age})”) void addUser(User user); /* * 用户数据修改 / @Update(“update t_user set name=#{name},age=#{age} where id=#{id}”) void updateUser(User user); /* * 用户数据删除 / @Delete(“delete from t_user where id=#{id}”) void deleteUser(int id); /* * 根据用户名称查询用户信息 * / @Select(“SELECT id,name,age FROM t_user where name=#{userName}”) User findByName(@Param(“userName”) String userName); /* * 根据用户ID查询用户信息 * / @Select(“SELECT id,name,age FROM t_user where id=#{userId}”) User findById(@Param(“userId”) int userId); /* * 根据用户age查询用户信息 / @Select(“SELECT id,name,age FROM t_user where age = #{userAge}”) User findByAge(@Param(“userAge”) int userAge); }3 service业务层public interface UserService { /* * 新增用户 * @param user * @return / boolean addUser(User user); /* * 修改用户 * @param user * @return / boolean updateUser(User user); /* * 删除用户 * @param id * @return / boolean deleteUser(int id); /* * 根据用户名字查询用户信息 * @param userName / User findUserByName(String userName); /* * 根据用户ID查询用户信息 * @param userId / User findUserById(int userId); /* * 根据用户ID查询用户信息 * @param userAge */ User findUserByAge(int userAge);}4 serviceImpl实现层@Servicepublic class UserServiceImpl implements UserService { @Autowired private UserDao userDao; @Override public boolean addUser(User user) { boolean flag=false; try{ userDao.addUser(user); flag=true; }catch(Exception e){ e.printStackTrace(); } return flag; } @Override public boolean updateUser(User user) { boolean flag=false; try{ userDao.updateUser(user); flag=true; }catch(Exception e){ e.printStackTrace(); } return flag; } @Override public boolean deleteUser(int id) { boolean flag=false; try{ userDao.deleteUser(id); flag=true; }catch(Exception e){ e.printStackTrace(); } return flag; } @Override public User findUserByName(String userName) { return userDao.findByName(userName); } @Override public User findUserById(int userId) { return userDao.findById(userId); } @Override public User findUserByAge(int userAge) { return userDao.findByAge(userAge); }}4 controller层编写@RestController@RequestMapping(value = “/api/user”)public class UserRestController { @Autowired private UserService userService; @RequestMapping(value = “/addUser”, method = RequestMethod.POST) public boolean addUser( User user) { System.out.println(“开始新增…”); return userService.addUser(user); } @RequestMapping(value = “/updateUser”, method = RequestMethod.PUT) public boolean updateUser( User user) { System.out.println(“开始更新…”); return userService.updateUser(user); } @RequestMapping(value = “/deleteUser”, method = RequestMethod.DELETE) public boolean delete(@RequestParam(value = “userName”, required = true) int userId) { System.out.println(“开始删除…”); return userService.deleteUser(userId); } @RequestMapping(value = “/userName”, method = RequestMethod.GET) public User findByUserName(@RequestParam(value = “userName”, required = true) String userName) { System.out.println(“开始查询…”); return userService.findUserByName(userName); } @RequestMapping(value = “/userId”, method = RequestMethod.GET) public User findByUserId(@RequestParam(value = “userId”, required = true) int userId) { System.out.println(“开始查询…”); return userService.findUserById(userId); } @RequestMapping(value = “/userAge”, method = RequestMethod.GET) public User findByUserAge(@RequestParam(value = “userAge”, required = true) int userAge) { System.out.println(“开始查询…”); return userService.findUserByAge(userAge); }}