一、背景

基于SpringBoot 构建了一个http文件下载服务，检查tomcat access 发现偶尔出现500 状态码的请求，检查抛出的异常堆栈

  1. 2019-03-20 10:03:14,273 ERROR [http-bio-8080-exec-3] o.s.b.w.s.s.ErrorPageFilter - Forwarding to error page from request [/demo.xls] due to exception [org.springframewo
  2. rk.web.util.NestedServletException: Request processing failed; nested exception is java.lang.IllegalStateException: InputStream has already been read - do not use InputStreamResource if a stream needs to be
  3. read multiple times]
  4. javax.servlet.ServletException: org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.IllegalStateException: InputStream has already been read - do not
  5.  use InputStreamResource if a stream needs to be read multiple times
  6.         at com.vdian.vtrace.VtraceFilter.doFilter(VtraceFilter.java:65)
  7.         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
  8.         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
  9.         at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)
  10.         at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
  11.         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
  12.         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
  13.         at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:109)
  14.         at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
  15.         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
  16.         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
  17.         at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81)
  18.         at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
  19.         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
  20.         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
  21.         at org.springframework.boot.web.servlet.support.ErrorPageFilter.doFilter(ErrorPageFilter.java:115)
  22.         at org.springframework.boot.web.servlet.support.ErrorPageFilter.access$000(ErrorPageFilter.java:59)
  23.         at org.springframework.boot.web.servlet.support.ErrorPageFilter$1.doFilterInternal(ErrorPageFilter.java:90)
  24.         at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
  25.         at org.springframework.boot.web.servlet.support.ErrorPageFilter.doFilter(ErrorPageFilter.java:108)
  26.         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
  27.         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
  28.         at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200)
  29.         at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
  30.         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
  31.         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
  32.         at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
  33.         at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
  34.         at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
  35.         at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)
  36.         at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
  37.         at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956)
  38.         at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
  39.         at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:436)
  40.         at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1078)
  41.         at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625)
  42.         at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
  43.         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
  44.         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
  45.         at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
  46.         at java.lang.Thread.run(Thread.java:745)
  47. Caused by: org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.IllegalStateException: InputStream has already been read - do not use InputStreamResource if a stream needs to be read multiple times
  48.         at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:986)
  49.         at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:870)
  50.         at javax.servlet.http.HttpServlet.service(HttpServlet.java:624)
  51.         at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:855)
  52.         at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
  53.         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
  54.         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
  55.         at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
  56.         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
  57.         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
  58.         at com.vdian.vtrace.VtraceFilter.doFilter(VtraceFilter.java:50)
  59.         ... 40 common frames omitted
  60. Caused by: java.lang.IllegalStateException: InputStream has already been read - do not use InputStreamResource if a stream needs to be read multiple times
  61.         at org.springframework.core.io.InputStreamResource.getInputStream(InputStreamResource.java:97)
  62.         at org.springframework.http.converter.ResourceHttpMessageConverter.writeContent(ResourceHttpMessageConverter.java:130)
  63.         at org.springframework.http.converter.ResourceHttpMessageConverter.writeInternal(ResourceHttpMessageConverter.java:124)
  64.         at org.springframework.http.converter.ResourceHttpMessageConverter.writeInternal(ResourceHttpMessageConverter.java:45)
  65.         at org.springframework.http.converter.AbstractHttpMessageConverter.write(AbstractHttpMessageConverter.java:230)
  66.         at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:274)
  67.         at org.springframework.web.servlet.mvc.method.annotation.HttpEntityMethodProcessor.handleReturnValue(HttpEntityMethodProcessor.java:218)
  68.         at org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:82)
  69.         at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:119)
  70.         at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:870)
  71.         at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:776)
  72.         at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
  73.         at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:991)
  74.         at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:925)
  75.         at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:978)
  76.         ... 50 common frames omitted

二、问题排查

从exception message 看，是

  1. java.lang.IllegalStateException: InputStream has already been read - do not use InputStreamResource if a stream needs to be read multiple times

StackOverflow 查一下发现有解决方案，就是把Resonse body 由InputStreamResource 类型改为ByteArrayResource即可，

但想八一八什么原因

（一）初步尝试

取异常请求的 URL，在chrome 浏览器上重试，并没有复现问题

（二）抓包查看

发现 500的请求中有Range Header

（三）问题复现

  1. curl -v -o test.amr -H "Range:bytes=0-" "http://aud.idcheihei.com/se1-sellerexpt-31e9000001698f06b9370a216239.amr"

　使用curl 命令带上Range header 请求后端，请求返回500，复现问题

（四）根据堆栈查看代码

org.springframework.core.io.InputStreamResource#getInputStream

inputstream 只能读取一次内容，所以这里有一个read 成员变量，控制resource 的读取

当resource 被读取一次后，第二次读取就会抛异常

那为什么会读取两次呢？

（五）本地debug

根据堆栈，打断点，org.springframework.core.io.InputStreamResource#getInputStream

逐步调试发现发起第一次getInputStream 调用的地方是：

org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor#writeWithMessageConverters(T, org.springframework.core.MethodParameter, org.springframework.http.server.ServletServerHttpRequest, org.springframework.http.server.ServletServerHttpResponse)

由 outputValue = HttpRange.toResourceRegions(httpRanges, resource);抛异常，进入catch 逻辑

org.springframework.http.HttpRange#toResourceRegion 实现体

  1.     public ResourceRegion toResourceRegion(Resource resource) {
  2.         Assert.isTrue(resource.getClass() != InputStreamResource.class, "Cannot convert an InputStreamResource to a ResourceRegion");
  3.  
  4.         try {
  5.             long contentLength = resource.contentLength();
  6.             Assert.isTrue(contentLength > 0L, "Resource content length should be > 0");
  7.             long start = this.getRangeStart(contentLength);
  8.             long end = this.getRangeEnd(contentLength);
  9.             return new ResourceRegion(resource, start, end - start + 1L);
  10.         } catch (IOException var8) {
  11.             throw new IllegalArgumentException("Failed to convert Resource to ResourceRegion", var8);
  12.         }
  13.     }

org.springframework.core.io.AbstractResource#contentLength的实现体：

  1.  public long contentLength() throws IOException {
  2.         InputStream is = this.getInputStream();
  3.  
  4.         try {
  5.             long size = 0L;
  6.  
  7.             int read;
  8.             for(byte[] buf = new byte[255]; (read = is.read(buf)) != -1; size += (long)read) {
  9.             }
  10.  
  11.             long var6 = size;
  12.             return var6;
  13.         } finally {
  14.             try {
  15.                 is.close();
  16.             } catch (IOException var14) {
  17.             }
  18.         }
  19.     }

　第二次getInputStream 调用的地方是输出内容的地方，/org/springframework/web/servlet/mvc/method/annotation/AbstractMessageConverterMethodProcessor.class:214

debug 到这里，已定位问题

（六）结论

1、文件下载 http 请求使用range header 时，response 需要设置一个Content-Range header，设置这个header 需要获取response body 的contentlength，对于InputStreamResource这种resource，需要读取整个inputstream的内容后才能得到body 的长度
2、resonse 填充文件内容的时候，由于 inputstream 读取完成后不能再次读取，所以抛出了InputStream has already been read - do not use InputStreamResource if a stream needs to be read multiple times 异常

本文作者：Blyde
原文链接：https://www.cnblogs.com/gliu/p/10570687.html 
版权归作者所有，转载请注明出处

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