@ExceptionHandler 不适用于 @EnableWebMvc，为 ResponseEntity 返回 HttpMediaTypeNotAcceptableException (406)

Question

我在 Spring Boot（版本 1.5.13）中有一些 REST Web 服务

我想使用@ControllerAdvice 来处理控制器抛出的异常。

对于下面的 API testA，如果 id=123，@ControllerAdvice 类能够捕获并处理异常，但是，如果 id 不等于 123，我的程序无法将 ResponseEntity 转换为 JSON 和“org .springframework.web.HttpMediaTypeNotAcceptableException: 找不到可接受的表示 (406)" 被抛出。

如果我取消注释下面的@EnableWebMvc，ResponseEntity 能够正确返回 JSON 结果，但是，@ControllerAdvice 将无法捕获异常。

@RestController("SpocController")
//@EnableWebMvc
@RequestMapping(value = { "/testing" })
public class TestController 
{   
    @GetMapping(value = "/testA", produces = MediaType.APPLICATION_JSON_VALUE)
    public @ResponseBody ResponseEntity<Object> testA(@RequestParam String id) throws IOException   
    {       
        if(id.equals("123"))
        {
            throw new IOException("customized exception");
        }

        Map<String,Object> body = new HashMap<String, Object>();
        body.put("hello", "hihi");

        return new ResponseEntity<Object>(body, HttpStatus.OK);     
    }

    @GetMapping(value = "/testB", produces = MediaType.APPLICATION_JSON_VALUE)
    public @ResponseBody String testB(@RequestParam String id) throws IOException 
    {
        if(id.equals("123"))
        {
            throw new IOException("customized exception");
        }

        return "{ \"ok\":\"test ok\" }";
    }
}

对于API testB，由于返回类型为String，所以可以返回JSON格式的字符串，@ControllerAdvice也可以捕获并处理异常。

这是我的 ControllerAdvice：

@ControllerAdvice
public class TestExceptionHandler
{
    @ResponseBody
    @ExceptionHandler(IOException.class)
    protected ResponseEntity<Object> handleIOException(IOException ex) 
    {   
        Map<String, Object> map = new HashMap<String, Object>();
        map.put("message", ex.getMessage());        

        return new ResponseEntity(map, HttpStatus.INTERNAL_SERVER_ERROR);       
    }   
}

这就是我上面提到的 HttpMediaTypeNotAcceptableException (406)。

org.springframework.web.HttpMediaTypeNotAcceptableException: Could not find acceptable representation
    at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:259)
    at org.springframework.web.servlet.mvc.method.annotation.HttpEntityMethodProcessor.handleReturnValue(HttpEntityMethodProcessor.java:208)
    at org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:81)
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:113)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738)
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:967)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:635)
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:109)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:496)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803)
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:790)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1468)
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:748)

1) 无论我将@EnableWebMvc 放在哪里（在@RestController、@ControllerAdvice 或其他类中），我的@ExceptionHandler 都无法捕获任何异常。知道为什么会这样吗？

2) 我想让我的 API testA 正常工作，因为我真的想返回一个 ResponseEntity 类型，并且它引发的异常可以被 @ControllerAdvice 捕获。欢迎任何建议。

提前致谢。

Answer 1

使用@RestController，

无需使用@ResponseBody，您可以查看文档了解更多详情。

-确保您的请求映射工作并记录一些内容。

-尝试将@RestControllerAdvice 用于@RestController

Answer 2

1.                     @RestController
                       @RequestMapping(value = { "/testing" })
                       public class ExceptionController {
                            @GetMapping(value = "/testA", produces = MediaType.APPLICATION_JSON_VALUE)
                               public  ResponseEntity<Object> testA(@RequestParam String id) throws IOException   
                               {       
                                   if(id.equals("123"))
                                   {
                                       throw new IOException("customized exception");
                                   }
   
                                   Map<String,Object> body = new HashMap<String, Object>();
                                   body.put("hello", "hihi");
   
                                   return new ResponseEntity<Object>(body, HttpStatus.OK);     
                               }
                            @GetMapping(value = "/testB", produces = MediaType.APPLICATION_JSON_VALUE)
                               public  String testB(@RequestParam String id) throws IOException 
                               {
                                   if(id.equals("123"))
                                   {
                                       throw new IOException("customized exception");
                                   }
   
                                   return "{ \"ok\":\"test ok\" }";
                               }
   
                       }
   
   

2.更改您的建议控制器-：

                    package com.ad.blog.controller;

                    import java.io.IOException;
                    import java.util.Optional;

                    import org.springframework.hateoas.VndErrors;
                    import org.springframework.http.HttpStatus;
                    import org.springframework.http.ResponseEntity;
                    import org.springframework.web.bind.annotation.ExceptionHandler;
                    import org.springframework.web.bind.annotation.RequestMapping;

                    @org.springframework.web.bind.annotation.ControllerAdvice
                    @RequestMapping(produces = "application/vnd.error+json")
                    public class ControllerAdvice {
                        @ExceptionHandler(IOException.class) public ResponseEntity < VndErrors > notFoundException(final IOException e) {
                            return error(e, HttpStatus.NOT_FOUND, e.getMessage());
                        }
                        private ResponseEntity < VndErrors > error(final Exception exception, final HttpStatus httpStatus, final String logRef) {
                            final String message = Optional.of(exception.getMessage()).orElse(exception.getClass().getSimpleName());
                            return new ResponseEntity < > (new VndErrors(logRef, message), httpStatus);
                        }
                    }

1. 您需要在 pom.xml 文件中添加 hateos 依赖项。

                    <dependency>
                                <groupId>org.springframework.boot</groupId>
                                <artifactId>spring-boot-starter-hateoas</artifactId>
                            </dependency>

4. @EnableWebMVc 注解用于启用覆盖 DispatcherServlet 默认配置的 MVC Java 配置。如果要覆盖默认配置，请创建一个类-：

        @Configuration
        @EnableWebMvc
        public class WebConfig extends WebMvcConfigurerAdapter {


        }

Answer 3

找到了罪魁祸首，在注释了以下代码后，一切都像魅力一样。不管怎样，谢谢大家！

public HandlerExceptionResolver handlerExceptionResolver()
{
    return new HandlerExceptionResolver()
    {
        @Override
        public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object handler, Exception exception)
        {
            return null;
        }
    };
}