Java Spring Validator批注不起作用

@seenukarthi实际上是正确的.您必须在端点上使用@Valid才能使请求正文有效.

Note:验证错误在错误响应中不可见.

错误将显示在控制台日志(log)中.例如:

2023-11-20T13:12:13.057+05:30  WARN 85261 --- [nio-8081-exec-1] .w.s.m.s.DefaultHandlerExceptionResolver : Resolved [org.springframework.web.bind.MethodArgumentNotValidException: Validation failed for argument [0] in public org.springframework.http.ResponseEntity<java.lang.Object> com.example.TestController.create(com.example.MyRequestResult) with 2 errors: [Field error in object 'myRequestResult' on field 'name': rejected value [[]]; codes [NotEmpty.model.name,NotEmpty.name,NotEmpty.java.util.List,NotEmpty]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [model.name,name]; arguments []; default message [name]]; default message [List of name must not be empty]] [Field error in object 'model' on field 'name': rejected value [[]]; codes [Size.model.name,Size.name,Size.java.util.List,Size]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [model.name,name]; arguments []; default message [name],2147483647,1]; default message [List of name must have at least one element]] ]

请仔细查看日志(log).它会在那里的.

现在，如果您想要捕获请求正文上发生的验证错误并将其包括到响应中，那么您必须使用org.springframework.validation.BindingResult.

让我举一个例子来说明:

如果可能，更新ExecutionResultDTO以列出错误:

@Data
public class ExecutionResultDTO {

    private List<String> name;

    private List<String> errors;

}

更新了我用于测试的控制器:

import jakarta.validation.Valid;
import org.springframework.context.support.DefaultMessageSourceResolvable;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.*;

@RestController
public class TestController {

    @PostMapping("create")
    public ResponseEntity<ExecutionResultDTO> create(@Valid @RequestBody MyRequestResult myRequestResult, BindingResult bindingResult) {
        ExecutionResultDTO dto = new ExecutionResultDTO();
        dto.setName(myRequestResult.getName());
        if (bindingResult.hasErrors()) {
            dto.setErrors(bindingResult.getFieldErrors().stream()
                    .map(DefaultMessageSourceResolvable::getDefaultMessage).collect(Collectors.toList()));
            return new ResponseEntity<>(dto, HttpStatus.BAD_REQUEST);
        }
        return new ResponseEntity<>(dto, HttpStatus.CREATED);
    }
}

postman :

对于不正确的数据:

对于正确的数据:

相应地更改逻辑.这只是一个例子.