Question

我在Spring中有一个休息控制器 3.1 ，它允许使用GET和POST方法。

POST方法仅限于使用映射

生成输出

@RequestMapping（value =“projects”，method = RequestMethod.POST，produce = {“application / json”}）

如果我发出下一个请求，则返回405错误并显示“Allow：GET”标题。

POST /resources/projects
Content-Type: application/json
Accept: text/html

我发现Spring MVC Framework在handleNoMatch方法中优先考虑RequestMappingInfoHandlerMapping.java中的405 Error。

protected HandlerMethod handleNoMatch(Set<RequestMappingInfo> requestMappingInfos, String lookupPath, HttpServletRequest request) throws ServletException {
....
....
    if (!allowedMethods.isEmpty()) {
        throw new HttpRequestMethodNotSupportedException(request.getMethod(), allowedMethods);
    }
    else if (!consumableMediaTypes.isEmpty()) {
        MediaType contentType = null;
        if (StringUtils.hasLength(request.getContentType())) {
            contentType = MediaType.parseMediaType(request.getContentType());
        }
        throw new HttpMediaTypeNotSupportedException(contentType, new ArrayList<MediaType>(consumableMediaTypes));
    }
    else if (!producibleMediaTypes.isEmpty()) {
        throw new HttpMediaTypeNotAcceptableException(new ArrayList<MediaType>(producibleMediaTypes));
    }

但我希望我的REST API优先考虑406错误，因为它是有道理的，我对我的优先权是对的吗？我怎么能做到这一点？

我知道这个问题已在Spring 3.2中得到解决，但我无法升级到3.2。

我被建议扩展RequestMappingInfoHandlerMapping，但我不知道该怎么做。

Answer 1

我认为你的应用程序配置不正确。 @RequestMapping不是您所显示的，或者它是注释@Controller中未注册的方法。

以下是我DispatcherServlet

注册的唯一映射

@RequestMapping(value = "projects", method = RequestMethod.POST, produces = { "application/json" })
public String home() {
    System.out.println("HomeController: Passing through...");
    return "WEB-INF/views/home.jsp";
}

并使用

进行测试

CloseableHttpClient httpClient = HttpClientBuilder.create().build();
HttpPost post = new HttpPost("http://localhost:8080/resources/projects");
post.setHeader("Context-type", "application/json");
post.setHeader("Accept", "text/html");
HttpResponse httpResponse = httpClient.execute(post);
System.out.println(httpResponse);

我得到了

HTTP/1.1 406 Not Acceptable [Server: [...]]

正如所料。

您应该仔细检查日志，看看您想要的处理程序方法是否实际上已注册。日志将显示类似

的内容

2013-11-30 01:30:33,958 [localhost-startStop-1] INFO  o.s.w.s.m.m.a.RequestMappingHandlerMapping - Mapped "{[/projects],methods=[POST],params=[],headers=[],consumes=[],produces=[application/json],custom=[]}" onto public java.lang.String xyz.spring.mvc.HomeController.home()

在您的评论和建议的更改后

@RequestMapping(value = "projects", method = RequestMethod.POST, produces = { "application/json" })
public String home() {
    System.out.println("HomeController: Passing through...");
    return "WEB-INF/views/home.jsp";
}

@RequestMapping(value = "projects", method = RequestMethod.GET)
public String homeGet() {
    System.out.println("HomeControllerGet: Passing through...");
    return "WEB-INF/views/home.jsp";
}

这是启动日志

2013-12-02 08:33:57,233 [localhost-startStop-1] INFO  o.s.w.s.m.m.a.RequestMappingHandlerMapping - Mapped "{[/projects],methods=[POST],params=[],headers=[],consumes=[],produces=[application/json],custom=[]}" onto public java.lang.String xyz.sample.baremvc.HomeController.home() 
2013-12-02 08:33:57,234 [localhost-startStop-1] INFO  o.s.w.s.m.m.a.RequestMappingHandlerMapping - Mapped "{[/projects],methods=[GET],params=[],headers=[],consumes=[],produces=[],custom=[]}" onto public java.lang.String xyz.sample.baremvc.HomeController.homeGet()

Tomcat仍然给了我一个406

HTTP/1.1 406 Not Acceptable [[...]]

这是有道理的。请记住，produces属性的javadoc状态为

格式是单一媒体类型或媒体类型序列，带有请求仅在Accept与其中一种媒体类型匹配时映射。

由于您的请求的Accept标头与媒体类型不匹配，因此请求不可接受，并且会发生406。

Answer 2

你可以继承RequestMappingInfoHandlerMapping或RequestMappingHandlerMapping吗？

Answer 3

今天再次处理这个问题后，我对如何向Spring添加自定义处理程序映射以解决问题有一个正确的答案。

这个问题在Spring 3.2中没有发生，正如@Sotirios Delimanolis指出的那样。

如果你想在Spring 3.1中解决它，你可以：

将HandlerMapping子类化，如您所见：

{

public class CustomRequestMappingHandlerMapping extends RequestMappingHandlerMapping {

protected HandlerMethod handleNoMatch(
        Set<RequestMappingInfo> requestMappingInfos, String lookupPath,
        HttpServletRequest request) throws ServletException {
    Set<String> allowedMethods = new HashSet<String>(6);
    Set<MediaType> consumableMediaTypes = new HashSet<MediaType>();
    Set<MediaType> producibleMediaTypes = new HashSet<MediaType>();
    for (RequestMappingInfo info : requestMappingInfos) {
        if (info.getPatternsCondition().getMatchingCondition(request) != null) {
            if (info.getMethodsCondition().getMatchingCondition(request) == null) {
                for (RequestMethod method : info.getMethodsCondition()
                        .getMethods()) {
                    allowedMethods.add(method.name());
                }
            }
            if (info.getConsumesCondition().getMatchingCondition(request) == null) {
                consumableMediaTypes.addAll(info.getConsumesCondition()
                        .getConsumableMediaTypes());
            }
            if (info.getProducesCondition().getMatchingCondition(request) == null) {
                producibleMediaTypes.addAll(info.getProducesCondition()
                        .getProducibleMediaTypes());
            }
        }
    }
    if (!producibleMediaTypes.isEmpty()) {
        throw new HttpMediaTypeNotAcceptableException(
                new ArrayList<MediaType>(producibleMediaTypes));
    } else if (!consumableMediaTypes.isEmpty()) {
        MediaType contentType = null;
        if (StringUtils.hasLength(request.getContentType())) {
            contentType = MediaType
                    .parseMediaType(request.getContentType());
        }
        throw new HttpMediaTypeNotSupportedException(contentType,
                new ArrayList<MediaType>(consumableMediaTypes));
    } else if (!allowedMethods.isEmpty()) {
        throw new HttpRequestMethodNotSupportedException(
                request.getMethod(), allowedMethods);
    } else {
        return null;
    }
}

}

然后你有两个选择： 2.1将此bean添加到Spring XML配置中。

<bean name="handlerMapping" class="com.ncr.mobile.rest.handler.CustomRequestMappingHandlerMapping">
    <property name="order" value="-1" />
</bean>

2.2将此方法添加到WebConfig中。该命令可以为该类提供最高优先级。

@Configuration
public class WebConfig extends WebMvcConfigurationSupport {

  @Override
  @Bean
  public RequestMappingHandlerMapping requestMappingHandlerMapping() {
          RequestMappingHandlerMapping handlerMapping = new CustomRequestMappingHandlerMapping();
          handlerMapping.setOrder(-1);
          handlerMapping.setInterceptors(getInterceptors());
          return handlerMapping;
  }

}

我希望这可以帮助别人。

为什么Spring优先考虑405 Http Error over 406 Http Error

3 个答案: