public class ReportBaseAction extends BaseAction {

 /**

  * serialVersionUID   */  private static final long serialVersionUID = 2610690086910318859L;

 /**

  * excel output stream   */  protected InputStream csvStream;

 public String downloadReport() {

  try {    csvStream = new FileInputStream(getFilePath());    getResponse().setHeader("Content-Disposition",      "p_w_upload;filename=" + "REPORT.ZIP");

  } catch (Exception e) {

   e.printStackTrace();   }

  return SUCCESS;

 }    public InputStream getCsvStream() {   return csvStream;  }

 public void setCsvStream(InputStream csvStream) {

  this.csvStream = csvStream;  } }

 struts配置

  <action name="downloadReport" method="downloadReport" class="reportBaseAction">    <result name="success" type="stream">             <param name="contentType">application/zip</param>    <param name="inputName">csvStream</param>    <param name="contentDisposition">p_w_upload;filename="REPORT.ZIP"</param>    <param name="bufferSize">4096</param></result>   </action>  jsp配置   <s:form id="reportForm" action="downloadReport.html"    enctype="multipart/form-data" namespace="/report" method="post">