应用编程接口平台- DataTransformer中的DTO验证

import javax.validation.constraints.NotBlank;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Positive;

public class UserDTO {

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

    @NotNull(message = "Age is mandatory")
    @Positive(message = "Age must be a positive number")
    private Integer age;

    // Getters and Setters

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }
}

import org.springframework.validation.annotation.Validated;
import javax.validation.Valid;

@RestController
@Validated
public class UserController {

    @PostMapping("/users")
    public ResponseEntity<String> createUser(@Valid @RequestBody UserDTO userDTO) {
        // 处理用户创建逻辑
        return ResponseEntity.ok("User created successfully");
    }
}

import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.MethodArgumentNotValidException;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;

@ControllerAdvice
public class GlobalExceptionHandler {

    @ExceptionHandler(MethodArgumentNotValidException.class)
    public ResponseEntity<String> handleValidationExceptions(MethodArgumentNotValidException ex) {
        StringBuilder errors = new StringBuilder();
        ex.getBindingResult().getAllErrors().forEach((error) -> {
            String errorMessage = error.getDefaultMessage();
            errors.append(errorMessage).append("; ");
        });
        return new ResponseEntity<>(errors.toString(), HttpStatus.BAD_REQUEST);
    }
}