从Struts2-tiles2框架中的第三方下载管理器下载文件时，经常在Java中出现异常 [英] Frequently getting exceptions in java while downloading files from third party download managers in struts2-tiles2 framework

问题描述

在日志中，我发现我在tomcat日志&的堆栈跟踪中遇到以下异常log4j文件:

In logs, i have found that i am getting following exception in stacktrace of tomcat logs & log4j file :

org.apache.tiles.impl.BasicTilesContainer  - Error rendering tile
org.apache.tiles.util.TilesIOException: ServletException including path '/WEB-INF/jsp/layout.jsp'.
    at org.apache.tiles.servlet.context.ServletTilesRequestContext.wrapServletException(ServletTilesRequestContext.java:298)
    at org.apache.tiles.servlet.context.ServletTilesRequestContext.include(ServletTilesRequestContext.java:219)
    at org.apache.tiles.servlet.context.ServletTilesRequestContext.dispatch(ServletTilesRequestContext.java:177)
    at org.apache.tiles.context.TilesRequestContextWrapper.dispatch(TilesRequestContextWrapper.java:72)
    at org.apache.struts2.tiles.StrutsTilesRequestContext.dispatch(StrutsTilesRequestContext.java:88)
    at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:606)
    at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:246)
    at org.apache.struts2.views.tiles.TilesResult.doExecute(TilesResult.java:105)
    at org.apache.struts2.dispatcher.StrutsResultSupport.execute(StrutsResultSupport.java:186)
    at com.opensymphony.xwork2.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:362)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:266)
    at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52)
    at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:488)
    at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
    at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at cdac.gist.sipeit.filters.ClickjackFilter.doFilter(ClickjackFilter.java:35)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at cdac.gist.sipeit.filters.DisallowingAcceptRangeFilter.doFilter(DisallowingAcceptRangeFilter.java:58)
    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:501)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)
    at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2441)
    at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2430)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.IllegalStateException: getOutputStream() has already been called for this response
    at org.apache.catalina.connector.Response.getWriter(Response.java:636)
    at org.apache.catalina.connector.ResponseFacade.getWriter(ResponseFacade.java:213)
    at javax.servlet.ServletResponseWrapper.getWriter(ServletResponseWrapper.java:104)
    at org.apache.jasper.runtime.JspWriterImpl.initOut(JspWriterImpl.java:125)
    at org.apache.jasper.runtime.JspWriterImpl.flushBuffer(JspWriterImpl.java:118)
    at org.apache.jasper.runtime.PageContextImpl.release(PageContextImpl.java:186)
    at org.apache.jasper.runtime.JspFactoryImpl.internalReleasePageContext(JspFactoryImpl.java:126)
    at org.apache.jasper.runtime.JspFactoryImpl.releasePageContext(JspFactoryImpl.java:80)
    at org.apache.jsp.WEB_002dINF.jsp.layout_jsp._jspService(layout_jsp.java:104)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:748)
    at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:604)
    at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:543)
    at org.apache.tiles.servlet.context.ServletTilesRequestContext.include(ServletTilesRequestContext.java:217)
    ... 36 more

使用struts2文件下载流，我只是在html页面上提供链接，并且当用户单击链接时，如上所述在服务器端发生了异常.我不确定这是否与图块相关，因为我在图块body&中使用了html body标签.布局页面.

Using struts2 file download stream, i am just giving links on html page and when user clicks on the link an exception gets occured at server end, as mentioned above. I am not sure if this relates with tiles because i am using html body tag in tiles body & layout page as well.

这是我的struts2代码–

This is my struts2 code –

<action name="download" class="org.make.PDFDownload">
<param name="path">D:/DATA/PDFs/</param>
<result name="downloadFile" type="stream"> 
<param name="contentDisposition">attachment;filename="${fileName}"</param> <param name="contentType">application/pdf</param>
<param name="inputName">inputStream</param>
<param name="bufferSize">4096</param>
</result> 
</action>

这是我的Action类代码:

This is my Action class code:

public String execute() throws FileNotFoundException
 { 
LOGGER.info("File download execution in PDFDownload class execute method. Downloaded File Name is "+getFileName());
System.out.println("FileName : " + fileName);
System.out.println("Getter " + getFileName());
File fileToDownload = new File(path+fileName);
inputStream = new FileInputStream(fileToDownload);
contentLength = fileToDownload.length(); 
return "downloadedFile"; 
} 

我不在任何地方使用输出流.仍然在服务器端出现异常.

I am not using output stream anywhere. Still i am getting exception on server side.

推荐答案

使用过滤器阻止IDM多个请求.我也遇到同样的例外.

Use filter to block IDM multiple requests. I am also getting the same exception.

这篇关于从Struts2-tiles2框架中的第三方下载管理器下载文件时，经常在Java中出现异常的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！