下载功能中，struts两次调用acton里的execute（）方法，第二次调用就会报异常，但不影响功能的实现。求不报异常的解决办法

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下载功能中，struts两次调用acton里的execute（）方法，第二次调用就会报异常，但不影响功能的实现。求不报异常的解决办法5

异常如下-----
严重: Servlet.service() for servlet default threw exception
java.lang.IllegalStateException
at org.apache.catalina.connector.ResponseFacade.sendError(ResponseFacade.java:407)
at org.apache.struts2.dispatcher.Dispatcher.sendError(Dispatcher.java:770)
at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:505)
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:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)

java 代码如下----
package com.longtop.sysnet.controler.struts2;

import java.io.InputStream;

import java.io.UnsupportedEncodingException;

import java.net.URLDecoder;
import org.apache.struts2.ServletActionContext;

public class DownloadAction3 extends BaseAction {

private String fileName;// 初始的通过param指定的文件名属性

private String inputPath;// 指定要被下载的文件路径

public InputStream getInputStream() throws Exception {

// System.out.println(getRequest().getParameter("fileName"));
// 通过 ServletContext，也就是application 来读取数据
System.out.println();
System.out.println();
System.out.println(fileName);
System.out.println(URLDecoder.decode(fileName));
return ServletActionContext.getServletContext().getResourceAsStream(
inputPath + "\\" + fileName);

}

public String execute() throws Exception {

return SUCCESS;

}

public void setInputPath(String value) {

inputPath = value;

}

public void setFileName(String fileName) {

this.fileName = fileName;

}

/** 提供转换编码后的供下载用的文件名 */

public String getDownloadFileName() {

String downFileName = fileName;

try {

downFileName = new String(downFileName.getBytes(), "ISO8859-1");

} catch (UnsupportedEncodingException e) {

e.printStackTrace();

}

return downFileName;

}

}

struts.xml配置如下--

<action name="download3" class="com.longtop.sysnet.controler.struts2.DownloadAction3">

<param name="fileName">财务导入指标模板.xls</param>
      <param name="inputPath">/WEB-INF/download/</param>
      <result name="success" type="stream">
      <param name="contentType">
      application/octet-stream;charset=ISO8859-1
      </param>
      <param name="inputName">inputStream</param>
      
      <param name="contentDisposition">
      attachment;filename="${downloadFileName}"
      </param>
      <param name="bufferSize">4096</param>
      </result>
</action>