Spring-data-rest-webmvc：为什么在处理异常时不能直接呈现ObjectError-MethodArgumentNotValidException？

时间：2019-05-08 20:34:10

标签： spring rest spring-mvc spring-validator exceptionhandler

鉴于DefaultErrorAttributes（其中ObjectError可用于表示错误详细信息），我打算在处理异常时利用ObjectError来表达错误详细信息-MethodArgumentNotValidException`用纯 Spring 5 实现 REST API的实现。

我通过MethodArgumentNotValidException处理了extends ResponseEntityExceptionHandler：

import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.MethodArgumentNotValidException;
import org.springframework.web.bind.annotation.RestControllerAdvice;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.WebRequest;
import org.springframework.web.servlet.mvc.method.annotation.ResponseEntityExceptionHandler;
import org.springframework.web.util.WebUtils;

@RestControllerAdvice
public class RestExceptionsHandler extends ResponseEntityExceptionHandler {

  @Override
  protected ResponseEntity<Object> handleMethodArgumentNotValid(MethodArgumentNotValidException ex, HttpHeaders headers, HttpStatus status, WebRequest request) {       request.setAttribute(WebUtils.ERROR_STATUS_CODE_ATTRIBUTE, status.value(), RequestAttributes.SCOPE_REQUEST);
    request.setAttribute(WebUtils.ERROR_EXCEPTION_ATTRIBUTE, ex, RequestAttributes.SCOPE_REQUEST);
    BindingResult re = ((MethodArgumentNotValidException) ex).getBindingResult();
    return new ResponseEntity<>(re.getAllErrors().get(0), headers, status);
  }
}

在上面的代码中，BindingResult实例最终被称为getAllErrors()到return个List中的ObjectError。我只是尝试从List的{​​{1}}中获取第一个元素，然后大概将ObjectError呈现为 JSON 格式以进行测试。但是，使用 Jetty 运行它时，即使ObjectError是在提到的异常处理程序-MethodArgumentNotValidException中进行了处理（通过调试器证明），该JSON也用于handleMethodArgumentNotValid无法以JSON格式呈现，而是显示了Jetty Web容器的默认html错误页面

从Jetty生成的错误html代码如下：

ObjectError

问题：为什么在处理异常时无法直接呈现<html> <head> <meta http-equiv="Content-Type" content="text/html;charset=utf-8"/> <title>Error 400 Bad Request</title> </head> <body> <h2>HTTP ERROR 400</h2> <p>Problem accessing /masterdata/cities. Reason: <pre> Bad Request</pre> </p> <h3>Caused by:</h3> <pre>org.springframework.web.bind.MethodArgumentNotValidException: Validation failed for argument [0] in public com.rx.entity.City com.rx.rest.controller.CityController.createCity(com.rx.entity.City): [Field error in object &apos;city&apos; on field &apos;city&apos;: rejected value [null]; codes [NotNull.city.city,NotNull.city,NotNull.java.lang.String,NotNull]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [city.city,city]; arguments []; default message [city]]; default message [city cannot be empty]] at org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.resolveArgument(RequestResponseBodyMethodProcessor.java:138) at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:126) at org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:166) at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:134) at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:102) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:895) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:800) at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1038) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1005) at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:908) at javax.servlet.http.HttpServlet.service(HttpServlet.java:707) at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:882) at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:859) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1623) at org.eclipse.jetty.websocket.server.WebSocketUpgradeFilter.doFilter(WebSocketUpgradeFilter.java:214) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1610) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:540) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:146) at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132) at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:257) at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1588) at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255) at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1345) at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:203) at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:480) at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1557) at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:201) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1247) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:144) at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:220) at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:126) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132) at org.eclipse.jetty.server.Server.handle(Server.java:502) at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:364) at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:260) at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:305) at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103) at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:118) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:765) at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:683) at java.lang.Thread.run(Thread.java:748) </pre> <hr> <a href="http://eclipse.org/jetty">Powered by Jetty:// 9.4.14.v20181114</a> <hr/> </body> </html> -ObjectError？

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