restful

GET  http://127.0.0.1/user/{id}   获取用户数据
POST  http://127.0.0.1/user  form表单数据 新增用户数据
PUT  http://127.0.0.1/user	  更新用户数据
DELETE  http://127.0.0.1/user	  删除用户数据

@Autowired
    private UserService userService;

    /**
     * 根据ID查询用户数据
     * @param id
     * @return
     */
    @RequestMapping(value = "user/{id}", method = RequestMethod.GET)
    @ResponseBody
    public ResponseEntity<User> queryUserById(@PathVariable("id") Long id) {
        try {
            User user = this.userService.queryUserById(id);
            if (user != null) {
                return ResponseEntity.ok(user);
            }
            return ResponseEntity.status(HttpStatus.NOT_FOUND).body(user);
        } catch (Exception e) {
            e.printStackTrace();
            return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body(null);
        }
    }
    
    /**
     * 新增用户数据
     * @param user
     * @return
     */
    @RequestMapping(value = "user", method = RequestMethod.POST)
    public ResponseEntity<Void> saveUser(User user){
        try {
            this.userService.saveUser(user);
            //返回201状态
            return ResponseEntity.status(HttpStatus.CREATED).build();
        } catch (Exception e) {
            e.printStackTrace();
            return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).build();
        }
    }
    
    /**
     * 更新数据
     * @param user
     * @return
     */
    @RequestMapping(value = "user", method = RequestMethod.PUT)
    public ResponseEntity<Void> updateUser(User user){
        try {
            this.userService.updateUser(user);
            //返回201状态
            return ResponseEntity.ok(null);
        } catch (Exception e) {
            e.printStackTrace();
            //500
            return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).build();
        }
    }
    
    /**
     * 删除数据
     * @param user
     * @return
     */
    @RequestMapping(value = "user", method = RequestMethod.DELETE)
    public ResponseEntity<Void> updateUser(@RequestParam("ids")Long[] ids){
        try {
            this.userService.deleteUser(ids);
            //返回204状态
            return ResponseEntity.status(HttpStatus.NO_CONTENT).build();
        } catch (Exception e) {
            e.printStackTrace();
            //500
            return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).build();
        }
    }