HttpMediaTypeNotAcceptableException:在exceptionhandler

时间:2015-09-02 10:49:36

标签: java spring spring-mvc junit

我的控制器(Spring 4.1)中有以下图像下载方法:

@RequestMapping(value = "/get/image/{id}/{fileName}", method=RequestMethod.GET)
public @ResponseBody byte[] showImageOnId(@PathVariable("id") String id, @PathVariable("fileName") String fileName) {
    setContentType(fileName); //sets contenttype based on extention of file
    return getImage(id, fileName);
}

以下ControllerAdvice方法应处理不存在的文件并返回json错误响应:

@ExceptionHandler(ResourceNotFoundException.class)
@ResponseStatus(HttpStatus.NOT_FOUND)
public @ResponseBody Map<String, String> handleResourceNotFoundException(ResourceNotFoundException e) {
    Map<String, String> errorMap = new HashMap<String, String>();
    errorMap.put("error", e.getMessage());
    return errorMap;
}

我的JUnit测试完美无缺

编辑这是因为扩展.bla:这也适用于appserver):

@Test
public void testResourceNotFound() throws Exception {
    String fileName = "bla.bla";
      mvc.perform(MockMvcRequestBuilders.get("/get/image/bla/" + fileName)
            .with(httpBasic("test", "test")))
            .andDo(print())
            .andExpect(jsonPath("$error").value(Matchers.startsWith("Resource not found")))
            .andExpect(status().is(404));
}

并提供以下输出:

MockHttpServletResponse:
          Status = 404
   Error message = null
         Headers = {X-Content-Type-Options=[nosniff], X-XSS-Protection=[1; mode=block], Cache-Control=[no-cache, no-store, max-age=0, must-revalidate], Pragma=[no-cache], Expires=[0], X-Frame-Options=[DENY], Content-Type=[application/json]}
    Content type = application/json
            Body = {"error":"Resource not found: bla/bla.bla"}
   Forwarded URL = null
  Redirected URL = null
         Cookies = []

但是在我的appserver上,我在尝试下载非现有图像时收到以下错误消息:

编辑这是因为扩展.jpg:在使用.jpg扩展的JUnit测试中也失败了):

ERROR org.springframework.web.servlet.mvc.method.annotation.ExceptionHandlerExceptionResolver - Failed to invoke @ExceptionHandler method: public java.util.Map<java.lang.String, java.lang.String> nl.krocket.ocr.web.controller.ExceptionController.handleResourceNotFoundException(nl.krocket.ocr.web.backing.ResourceNotFoundException) org.springframework.web.HttpMediaTypeNotAcceptableException: Could not find acceptable representation

我已在mvc配置中配置了messageconverters,如下所示:

@Override
public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
    converters.add(mappingJackson2HttpMessageConverter());
    converters.add(byteArrayHttpMessageConverter());
}

@Bean
public MappingJackson2HttpMessageConverter mappingJackson2HttpMessageConverter() {
    ObjectMapper objectMapper = new ObjectMapper();
    objectMapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
    objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
    //objectMapper.registerModule(new JSR310Module());
    MappingJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter();
    converter.setObjectMapper(objectMapper);
    converter.setSupportedMediaTypes(getJsonMediaTypes());
    return converter;
}

@Bean
public ByteArrayHttpMessageConverter byteArrayHttpMessageConverter() {
    ByteArrayHttpMessageConverter arrayHttpMessageConverter = new ByteArrayHttpMessageConverter();
    arrayHttpMessageConverter.setSupportedMediaTypes(getImageMediaTypes());
    return arrayHttpMessageConverter;
}

我缺少什么?为什么JUnit测试有效?

2 个答案:

答案 0 :(得分:27)

您需要决定Spring应如何确定响应的媒体类型。这可以通过几种方式完成:

  • 路径扩展(例如/image.jpg)
  • 网址参数(例如?格式= jpg)
  • HTTP Accept标头(例如,Accept:image / jpg)

默认情况下,Spring会查看扩展名而不是Accept标头。如果您实现扩展@Configuration的{​​{1}}类,则可以更改此行为。在那里,您可以覆盖WebMvcConfigurerAdapter并根据您的需要配置配置器,例如。通过调用

configureContentNegotiation(ContentNegotiationConfigurer configurer)

如果将两者都设置为ContentNegotiationConfigurer#favorParameter ContentNegotiationConfigurer#favorPathExtension ,那么Spring将查看false标题。由于您的客户端可以说Accept并处理它们,因此Spring应该能够返回图像或错误JSON。

有关更多信息和示例,请参阅有关内容协商的this Spring tutorial

答案 1 :(得分:2)

注意您的HTTP Accept标头。 例如,如果您的控制器生成&#34; application / octet-stream&#34; (作为回应),你的Accept标题不应该是&#34; application / json&#34; (请求中):

@GetMapping(value = "/download", produces = MediaType.APPLICATION_OCTET_STREAM_VALUE)
public void download(HttpServletResponse response) {}