在SpringBoot中使用@Valid和@Requestbody验证JSON对象

import javax.validation.constraints.Email;
import javax.validation.constraints.NotBlank;
import javax.validation.constraints.Size;

public class User {

    @NotBlank(message = "Name is mandatory")
    private String name;

    @NotBlank(message = "Email is mandatory")
    @Email(message = "Email should be valid")
    private String email;

    @Size(min = 6, message = "Password should be at least 6 characters")
    private String password;

    // getters and setters
}

import org.springframework.http.ResponseEntity;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.*;

import javax.validation.Valid;

@RestController
@RequestMapping("/users")
public class UserController {

    @PostMapping
    public ResponseEntity<?> createUser(@Valid @RequestBody User user, BindingResult result) {
        if (result.hasErrors()) {
            return ResponseEntity.badRequest().body(result.getAllErrors());
        }
        // save user to database and return success response
        return ResponseEntity.ok("User is valid");
    }
}

@PostMapping
public ResponseEntity<?> createUser(@Valid @RequestBody User user, BindingResult result) {
    if (result.hasErrors()) {
        return ResponseEntity.badRequest().body(result.getAllErrors());
    }
    // proceed with user creation
}