Struts2下載檔案點取消、重複下載出現的異常解決
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在使用Struts2下載檔案時，如果重複下載，會丟擲如下異常：
java.lang.IllegalStateException: Cannot call sendError() after the response has been committed
at org.apache.catalina.connector.ResponseFacade.sendError(ResponseFacade.java:462)
at org.apache.struts2.dispatcher.Dispatcher.sendError(Dispatcher.java:771)
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:239)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:617)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:668)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2503)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2492)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)
解決方法：
1、下載struts2-sunspoter-stream-1.2.jar，複製到WEB-INF/lib下
2、在原有的struts.xml的基礎上進行相應的配置，如下：
<package name="action" namespace="/" extends="struts-default">
<!-- 此配置用來消除重複下載、取消下載導致的異常 -->
<result-types>
<result-type name="streamx" class="cc.fozone.struts2.StreamResultX"/>
</result-types>
<action name="download" class="com.DownloadAction">
<result name="success" type="streamx">
<param name="inputName">download</param>
<param name="bufferSize">4096</param>
<param name="contentDisposition">filename=""</param>
<param name="contentCharSet">UTF-8</param>
</result>
</action>
</package>
紅色部分為新增的部分，並在原有的result中type改為“streamx”
如果是使用註解方式同樣如下：
@Result(type="streamx", params= {"inputName","inputStream","bufferSize","4096", "contentDisposition", "attachment;filename=\"${downloadFileName}\""})