SpringBoot使用@NotEmpty、@NotBlank、@NotNull注解进行参数校验

xmlCopy code
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-validation</artifactId>
</dependency>

import javax.validation.Valid;
import javax.validation.constraints.NotBlank;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RestController;

@RestController
@Validated
public class UserController {

    @PostMapping("/register")
    public String registerUser(@Valid @RequestBody UserDTO userDTO) {
        // 处理用户注册逻辑
        return "User registered successfully!";
    }

    public static class UserDTO {
        @NotBlank(message = "用户名不能为空")
        private String username;

        @NotBlank(message = "密码不能为空")
        private String password;

        // 省略 getter 和 setter 方法
    }
}

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

@ControllerAdvice
public class GlobalExceptionHandler {

	@ExceptionHandler(MethodArgumentNotValidException.class)
	public ResponseEntity<String> handleValidationExceptions(MethodArgumentNotValidException ex) {
    return new ResponseEntity<>("Invalid request: " + ex.getMessage(), HttpStatus.BAD_REQUEST);
  }

// 可以添加其他异常处理方法
}