我在Spring Boot（版本1.5.13）中有一些REST Web服务
我想使用@ControllerAdvice处理控制器抛出的异常。
对于下面的API testA，如果id = 123，则@ControllerAdvice类能够捕获并处理异常，但是，如果id不等于123，则我的程序无法将ResponseEntity转换为JSON和“ org .springframework.web.HttpMediaTypeNotAcceptableException：找不到可接受的表示形式（406）”。
如果我取消注释下面的@EnableWebMvc，则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，因此它能够以JSON返回字符串，而@ControllerAdvice也能够捕获和处理异常。
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放在何处（在@ RestController，@ ControllerAdvice或其他类中），我的@ExceptionHandler都将无法捕获任何异常。知道为什么会发生吗？
2）我想使我的API testA正常工作，因为我真的想返回ResponseEntity类型，并且@ControllerAdvice可以捕获它引发的异常。欢迎任何建议。
谢谢。
答案 0 :(得分：0)
使用@RestController
无需使用@ResponseBody，您可以查看文档以了解更多详细信息。
-确保您的请求映射正常工作并记录一些内容。
-尝试对@RestController使用@RestControllerAdvice
答案 1 :(得分：0)
@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);
}
}
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-hateoas</artifactId>
</dependency>
@Configuration
@EnableWebMvc
public class WebConfig extends WebMvcConfigurerAdapter {
}
答案 2 :(得分：0)
找到了罪魁祸首，在注释了以下代码部分之后，所有内容都像一个魅力。无论如何，谢谢大家！
public HandlerExceptionResolver handlerExceptionResolver()
{
return new HandlerExceptionResolver()
{
@Override
public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object handler, Exception exception)
{
return null;
}
};
}