maven引入

<dependency>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-validation</artifactId>

</dependency>

在controller请求的参数前加上@Vaild注解

@PostMapping("/login")

public String login(@RequestBody @Valid UmsMemberLoginParamDTO umsMemberLoginParamDTO) {

String res ="error";

boolean result =umsMemberService.login(umsMemberLoginParamDTO);

if (result) {

res ="success";

}

return res;

}

在实体类或者传递的参数中增加要进行的验证

新增一个类，添加@ControllerAdvice注解

继承ResponseEntityExceptionHandler

并重写handleMethodArgumentNotValid方法

@ControllerAdvice

public class ValidateHandler extends ResponseEntityExceptionHandler {

@Override

    protected ResponseEntity handleMethodArgumentNotValid(MethodArgumentNotValidException ex, HttpHeaders headers, HttpStatus status, WebRequest request) {

StringBuilder sb=new StringBuilder();

for(FieldError fieldError:ex.getFieldErrors()){

String defaultError = fieldError.getDefaultMessage();

sb.append("" + defaultError);

break;

}

return new ResponseEntity<>(ResultWrapper.getFailBuilder().code(333).msg(sb.toString()).build(), HttpStatus.OK);

}

}

这时候当postman请求的时候，如果对应字段不输入则返回