[英]SpringBoot DTO Validation
我是 spring-boot 的新手,我正在嘗試向我的 DTO class 添加驗證,如下所示。
import javax.validation.constraints.NotBlank;
@Getter
@Setter
public class EmployeeDto {
private Long id;
@NotBlank(message = "Employee first name is required")
private String firstName;
private String lastName;
@NotBlank(message = "EmployeeNUM is required")
private String employeeNum;
}
下面是我的 REST 端點來保存員工。
import javax.validation.Valid;
@PostMapping("/employee")
public ResponseEntity<?> addEmployee(@Valid @RequestBody EmployeeDto employeeDto) throws ClassNotFoundException {
return ResponseEntity.ok(employeeService.saveEmployee(deptId,employeeDto));
}
我創建了一個如下所示的驗證 class 來驗證 DTO 字段。
@ControllerAdvice
@RestController
public class Validation {
@ResponseStatus(HttpStatus.BAD_REQUEST)
@ExceptionHandler(MethodArgumentNotValidException.class)
public Map<String, String> handleValidationExceptions(
MethodArgumentNotValidException ex) {
Map<String, String> errors = new HashMap<>();
ex.getBindingResult().getAllErrors().forEach((error) -> {
String fieldName = ((FieldError) error).getField();
String errorMessage = error.getDefaultMessage();
errors.put(fieldName, errorMessage);
});
return errors;
}
}
預計 output 是
{ "firstName":"員工名字是必填項", "employeeNum":"EmployeeNUM 是必填項" }
但是當通過 postman 到達端點時,我只收到 400 錯誤請求。 我的代碼有什么問題? 如上所述,如何修復並獲得預期的 output?
嘗試像這樣擴展ResponseEntityExceptionHandler
class:
import org.apache.commons.collections4.CollectionUtils;
import org.apache.commons.lang3.StringUtils;
import org.springframework.http.HttpHeaders;
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;
import org.springframework.web.context.request.WebRequest;
import org.springframework.web.servlet.mvc.method.annotation.ResponseEntityExceptionHandler;
import javax.validation.ConstraintViolationException;
import java.time.Instant;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
/**
* * Handle all exceptions and java bean validation errors for all endpoints income data that use the @Valid annotation
*
* @author Ehab Qadah
*/
@ControllerAdvice
public class GeneralExceptionHandler extends ResponseEntityExceptionHandler {
@Override
protected ResponseEntity<Object> handleMethodArgumentNotValid(MethodArgumentNotValidException exception, HttpHeaders headers,
HttpStatus status, WebRequest request) {
List<String> validationErrors = exception.getBindingResult()
.getFieldErrors()
.stream()
.map(error -> error.getField() + ": " + error.getDefaultMessage())
.collect(Collectors.toList());
return getExceptionResponseEntity(HttpStatus.BAD_REQUEST, request, validationErrors);
}
@ExceptionHandler({ConstraintViolationException.class})
public ResponseEntity<Object> handleConstraintViolation(
ConstraintViolationException exception, WebRequest request) {
List<String> validationErrors = exception.getConstraintViolations().stream().
map(violation -> violation.getPropertyPath() + ": " + violation.getMessage())
.collect(Collectors.toList());
return getExceptionResponseEntity(HttpStatus.BAD_REQUEST, request, validationErrors);
}
private ResponseEntity<Object> getExceptionResponseEntity(final HttpStatus status, WebRequest request, List<String> errors) {
final Map<String, Object> body = new LinkedHashMap<>();
final String errorsMessage = CollectionUtils.isNotEmpty(errors) ? errors.stream().filter(StringUtils::isNotEmpty).collect(Collectors.joining(",")):status.getReasonPhrase();
final String path = request.getDescription(false);
body.put("TIMESTAMP", Instant.now());
body.put("STATUS", status.value());
body.put("ERRORS", errorsMessage);
body.put("PATH", path);
body.put("MESSAGE", status.getReasonPhrase());
return new ResponseEntity<>(body, status);
}
}
@Ehab Qadah 的復制答案。
唯一的修改是在字符串的 map 中給出錯誤字段,而不是字符串
@ExceptionHandler({ConstraintViolationException.class})
public ResponseEntity<Object> handleConstraintViolation(
ConstraintViolationException exception, WebRequest request) {
Map<String, String> fieldErrors = ex.getConstraintViolations().stream()
.collect(Collectors.toMap(cv -> cv.getPropertyPath().toString(), ConstraintViolation::getMessage));
return getExceptionResponseEntity(HttpStatus.BAD_REQUEST, request, fieldErrors);
}
private ResponseEntity<Object> getExceptionResponseEntity(final HttpStatus status, WebRequest request, List<String> errors) {
final Map<String, Object> body = new LinkedHashMap<>();
final String errorsMessage = CollectionUtils.isNotEmpty(errors) ? errors.stream().filter(StringUtils::isNotEmpty).collect(Collectors.joining(",")):status.getReasonPhrase();
final String path = request.getDescription(false);
body.put("TIMESTAMP", Instant.now());
body.put("STATUS", status.value());
body.put("ERRORS", errorsMessage);
body.put("PATH", path);
body.put("MESSAGE", status.getReasonPhrase());
return new ResponseEntity<>(body, status);
}
我使用了下面的 class 現在它工作正常。
@Service
public class MapValidationErrorService {
public ResponseEntity<?> MapValidationService(BindingResult result){
if(result.hasErrors()){
Map<String, String> errorMap = new HashMap<>();
for(FieldError error: result.getFieldErrors()){
errorMap.put(error.getField(), error.getDefaultMessage());
}
return new ResponseEntity<Map<String, String>>(errorMap, HttpStatus.BAD_REQUEST);
}
return null;
}
}
在 COntroller
@Autowired
private MapValidationErrorService mapValidationErrorService;
@PostMapping("/employee/{deptId}")
public ResponseEntity<?> addEmployee(@PathVariable(name = "deptId") String deptId,@Valid @RequestBody EmployeeDto employeeDto, BindingResult result) throws ClassNotFoundException {
ResponseEntity<?> errorMap = mapValidationErrorService.MapValidationService(result);
if(errorMap != null)return errorMap;
return ResponseEntity.ok(employeeService.saveEmployee(deptId,employeeDto));
}
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