gpt4 book ai didi

spring-boot - Spring Boot ExceptionHandler 抛出更多错误

转载 作者:行者123 更新时间:2023-12-04 17:54:09 26 4
gpt4 key购买 nike

我正在使用通过注释配置的 Spring Boot,我遇到了异常处理程序会抛出我无法捕获的错误的问题。我想出了如何阻止错误被抛出,但我不知道它为什么会起作用。

@ControllerAdvice
public class MyExceptionAdvice {
...snip...
@ResponseBody
@ExceptionHandler(HttpMediaTypeNotAcceptableException.class)
void mediaTypeExceptionHandler(HttpMediaTypeNotAcceptableException e) {
logger.info("exception: {}", e.getMessage());
}
}

使用 curl curl -v -H "Accept: application/xhtml xml"'http://localhost:8080/testEndpoint' 触发此异常导致记录以下内容:

2017-01-24 11:08:20 [http-nio-8080-exec-1] [INFO] MyExceptionAdvice - exception: Could not parse 'Accept' header [application/xhtml xml]: Invalid mime type "application/xhtml xml": Invalid token character ' ' in token "xhtml xml" - 

2017-01-24 11:08:20 [http-nio-8080-exec-1] [WARN] org.springframework.web.servlet.mvc.method.annotation.ExceptionHandlerExceptionResolver - Failed to invoke @ExceptionHandler method: void MyExceptionAdvice.mediaTypeExceptionHandler(javax.servlet.http.HttpServletRequest,org.springframework.web.HttpMediaTypeNotAcceptableException) - org.springframework.web.HttpMediaTypeNotAcceptableException: Could not parse 'Accept' header [application/xhtml xml]: Invalid mime type "application/xhtml xml": Invalid token character ' ' in token "xhtml xml"
at org.springframework.web.accept.HeaderContentNegotiationStrategy.resolveMediaTypes(HeaderContentNegotiationStrategy.java:59)
...snip...

2017-01-24 11:08:20 [http-nio-8080-exec-1] [WARN] org.springframework.web.servlet.mvc.support.DefaultHandlerExceptionResolver - Handling of [org.springframework.web.HttpMediaTypeNotAcceptableException] resulted in Exception - java.lang.IllegalStateException: Cannot call sendError() after the response has been committed
at org.apache.catalina.connector.ResponseFacade.sendError(ResponseFacade.java:472)
...snip...

2017-01-24 11:08:20 [http-nio-8080-exec-1] [ERROR] org.apache.catalina.core.ContainerBase.[Tomcat].[localhost].[/].[dispatcherServlet] - Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Could not parse 'Accept' header [application/xhtml xml]: Invalid mime type "application/xhtml xml": Invalid token character ' ' in token "xhtml xml"] with root cause - org.springframework.web.HttpMediaTypeNotAcceptableException: Could not parse 'Accept' header [application/xhtml xml]: Invalid mime type "application/xhtml xml": Invalid token character ' ' in token "xhtml xml"
at org.springframework.web.accept.HeaderContentNegotiationStrategy.resolveMediaTypes(HeaderContentNegotiationStrategy.java:59)
...snip...

对客户端的响应是一堆 HTML 和堆栈跟踪:

<!DOCTYPE html><html><head><title>Apache Tomcat/8.5.6 - Error report</title><style type="text/css">H1 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:22px;} H2 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:16px;} H3 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:14px;} BODY {font-family:Tahoma,Arial,sans-serif;color:black;background-color:white;} B {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;} P {font-family:Tahoma,Arial,sans-serif;background:white;color:black;font-size:12px;}A {color : black;}A.name {color : black;}.line {height: 1px; background-color: #525D76; border: none;}</style> </head><body><h1>HTTP Status 500 - Could not parse 'Accept' header [application/xhtml xml]: Invalid mime type &quot;application/xhtml xml&quot;: Invalid token character ' ' in token &quot;xhtml xml&quot;</h1><div class="line"></div><p><b>type</b> Exception report</p><p><b>message</b> <u>Could not parse 'Accept' header [application/xhtml xml]: Invalid mime type &quot;application/xhtml xml&quot;: Invalid token character ' ' in token &quot;xhtml xml&quot;</u></p><p><b>description</b> <u>The server encountered an internal error that prevented it from fulfilling this request.</u></p><p><b>exception</b></p><pre>org.springframework.web.HttpMediaTypeNotAcceptableException: Could not parse 'Accept' header [application/xhtml xml]: Invalid mime type &quot;application/xhtml xml&quot;: Invalid token character ' ' in token &quot;xhtml xml&quot;
org.springframework.web.accept.HeaderContentNegotiationStrategy.resolveMediaTypes(HeaderContentNegotiationStrategy.java:59)
...snip...

在尝试记录不同的值时,我修改了异常处理程序以将响应作为参数。

@ResponseBody
@ExceptionHandler(HttpMediaTypeNotAcceptableException.class)
void mediaTypeExceptionHandler(HttpServletResponse response, HttpMediaTypeNotAcceptableException e) {
logger.info("exception: {}", e.getMessage());
}

现在,相同的 curl 只会产生我最初期望的日志,而不会在下游触发更多​​错误。

2017-01-24 11:30:31 [http-nio-8080-exec-1] [INFO] com.example.MyExceptionAdvice - exception: Could not parse 'Accept' header [application/xhtml xml]: Invalid mime type "application/xhtml xml": Invalid token character ' ' in token "xhtml xml" - 

客户端得到的响应是正确的。

我的问题是为什么?在将响应对象传递给处理程序之前,是否将响应对象作为参数在上游对其执行某些操作?如果什么都没有发生,那为什么后续错误会发生在下游?谢谢。

最佳答案

当 spring 尝试返回错误消息时,它使用请求“接受” header 的媒体类型来找出如何格式化响应。Spring 解析失败的“接受” header ,因为该值的格式无效并且抛出另一个异常,这就是您所看到的。

解决方案您可以使用 Controller 类或方法上的 @Request 映射来限制 API 接受的媒体类型,例如:

import org.springframework.http.MediaType;
@RequestMapping( MediaType.APPLICATION_JSON_VALUE)

如果您这样做,则根本不应接受具有与指定媒体类型不同的媒体类型的请求,并且将返回 Http 406“ Not Acceptable ”。因为没有创建任何内容,所以描述的问题应该不会再发生。

关于spring-boot - Spring Boot ExceptionHandler 抛出更多错误,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/41837501/

26 4 0
Copyright 2021 - 2024 cfsdn All Rights Reserved 蜀ICP备2022000587号
广告合作:1813099741@qq.com 6ren.com