【原创】InputStream has already been read - do not use InputStreamResource if a stream needs to be read multiple times
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
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
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
read multiple times]
javax.servlet.ServletException: 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
at com.vdian.vtrace.VtraceFilter.doFilter(VtraceFilter.java:65)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
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:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
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:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
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:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.springframework.boot.web.servlet.support.ErrorPageFilter.doFilter(ErrorPageFilter.java:115)
at org.springframework.boot.web.servlet.support.ErrorPageFilter.access$000(ErrorPageFilter.java:59)
at org.springframework.boot.web.servlet.support.ErrorPageFilter$1.doFilterInternal(ErrorPageFilter.java:90)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.springframework.boot.web.servlet.support.ErrorPageFilter.doFilter(ErrorPageFilter.java:108)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:436)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1078)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
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
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:986)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:870)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:624)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:855)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at com.vdian.vtrace.VtraceFilter.doFilter(VtraceFilter.java:50)
... 40 common frames omitted
Caused by: java.lang.IllegalStateException: InputStream has already been read - do not use InputStreamResource if a stream needs to be read multiple times
at org.springframework.core.io.InputStreamResource.getInputStream(InputStreamResource.java:97)
at org.springframework.http.converter.ResourceHttpMessageConverter.writeContent(ResourceHttpMessageConverter.java:130)
at org.springframework.http.converter.ResourceHttpMessageConverter.writeInternal(ResourceHttpMessageConverter.java:124)
at org.springframework.http.converter.ResourceHttpMessageConverter.writeInternal(ResourceHttpMessageConverter.java:45)
at org.springframework.http.converter.AbstractHttpMessageConverter.write(AbstractHttpMessageConverter.java:230)
at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:274)
at org.springframework.web.servlet.mvc.method.annotation.HttpEntityMethodProcessor.handleReturnValue(HttpEntityMethodProcessor.java:218)
at org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:82)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:119)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:870)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:776)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:991)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:925)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:978)
... 50 common frames omitted
二、问题排查
从exception message 看,是
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
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
public ResourceRegion toResourceRegion(Resource resource) {
Assert.isTrue(resource.getClass() != InputStreamResource.class, "Cannot convert an InputStreamResource to a ResourceRegion"); try {
long contentLength = resource.contentLength();
Assert.isTrue(contentLength > 0L, "Resource content length should be > 0");
long start = this.getRangeStart(contentLength);
long end = this.getRangeEnd(contentLength);
return new ResourceRegion(resource, start, end - start + 1L);
} catch (IOException var8) {
throw new IllegalArgumentException("Failed to convert Resource to ResourceRegion", var8);
}
}
org.springframework.core.io.AbstractResource#contentLength的实现体:
public long contentLength() throws IOException {
InputStream is = this.getInputStream(); try {
long size = 0L; int read;
for(byte[] buf = new byte[255]; (read = is.read(buf)) != -1; size += (long)read) {
} long var6 = size;
return var6;
} finally {
try {
is.close();
} catch (IOException var14) {
}
}
}
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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