註釋驗證

Question

好吧，首先我可以驗證用戶，如果我使用@Valid並且傳入的是User實例而不是json字符串。這工作正常e.g：

@RequestMapping(value = "/add", method = RequestMethod.POST) 
public String addUser(@Valid @ModelAttribute("user") User user, BindingResult result) { 
    userRep.save(user); 
    return "redirect:/"; 
} 

所以，問題是我如何可以自動創建某種API和傳入的JSON字符串，並驗證了註釋，例如，@Email，@NotEmpty？最佳做法是什麼？

@RequestMapping(method = RequestMethod.POST, headers = "Accept=application/json") 
public ResponseEntity<String> createFromJson(@RequestBody String json) {  
    User user = User.fromJsonToUser(json); 
    return new ResponseEntity<String>(user.toJson(),header,HttpStatus.CREATED); 
} 

User.class

public class User { 

    @Id 
    @GeneratedValue(strategy = GenerationType.AUTO) 
    private Long id; 

    @NotEmpty 
    @Length(max = 30) 
    private String firstName; 

    @Email   
    @NotEmpty 
    @Length(min = 3 , max = 50) 
    private String primaryEmail; 

} 

Answer 1

簡單地讓Spring解析字符串給用戶，並且具有相同@Valid註釋標註爲：

@RequestMapping(method = RequestMethod.POST, headers = "Accept=application/json") 
public ResponseEntity<String> createFromJson(@RequestBody @Valid User user) {  
    return new ResponseEntity<String>(user.toJson(), header, HttpStatus.CREATED); 
} 

甚至

@RequestMapping(method = RequestMethod.POST, headers = "Accept=application/json") 
public ResponseEntity<User> createFromJson(@RequestBody @Valid User user) {  
    return new ResponseEntity<User>(user, header, HttpStatus.CREATED); 
}