struts2输出并下载excel文件

Action文件：

 package com.credit.stats.model;
 import com.opensymphony.xwork2.ActionSupport;
 import org.apache.poi.hssf.usermodel.HSSFCell;
 import org.apache.poi.hssf.usermodel.HSSFRow;
 import org.apache.poi.hssf.usermodel.HSSFSheet;
 import org.apache.poi.hssf.usermodel.HSSFWorkbook;
 import org.apache.struts2.interceptor.ServletRequestAware;
 import org.apache.struts2.interceptor.ServletResponseAware;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
 import java.io.InputStream;
 import java.util.ArrayList;
 import java.util.List;
 /**
  * Created by IntelliJ IDEA.
  * User: 晃同
  * Date: 2010-10-14
  * Time: 15:31:38
  * To change this template use File | Settings | File Templates.
  */
 public class OutputExcelAction extends ActionSupport implements ServletRequestAware, ServletResponseAware{
     protected HttpServletRequest request = null;
     protected HttpServletResponse response = null;
     public void setServletRequest(HttpServletRequest arg0) {
         this.request = arg0;
     }
     public void setServletResponse(HttpServletResponse arg0) {
         this.response = arg0;
     }
     //获取输出流
     public InputStream getInputExcel()
     {
         return (InputStream)request.getAttribute("excelStream");
     }
     @Override
     public String execute() throws Exception {
             List<String> list = new ArrayList<String>();
             list.add("张三");
             list.add("李四三");
             if(list != null){
                  int rows=0;
                  HSSFWorkbook wk = new HSSFWorkbook();
                  HSSFSheet sheet = wk.createSheet("FollowAgentStats");
                  HSSFRow row = sheet.createRow(rows++);
                  int column=0;
                  HSSFCell cell = row.createCell(column++,HSSFCell.CELL_TYPE_STRING);
                  cell.setCellValue("序号");
                  cell = row.createCell(column++,HSSFCell.CELL_TYPE_STRING);
                  cell.setCellValue("姓名");
                  for(String ls:list){
                      row = sheet.createRow(rows++);
                      column=0;
                      cell = row.createCell(column++,HSSFCell.CELL_TYPE_NUMERIC);
                      cell.setCellValue(rows - 1);
                      cell = row.createCell(column++,HSSFCell.CELL_TYPE_STRING);
                      cell.setCellValue(ls);
                  }
                  try{
                      ByteArrayOutputStream out=new ByteArrayOutputStream();
                      wk.write(out);
                      request.setAttribute("excelStream",new ByteArrayInputStream(out.toByteArray()));
                      request.setAttribute("filename", "myexcel");//设置文件名
                      return SUCCESS;
                  }catch(Throwable th){
                      th.printStackTrace();
                      System.out.println("无法输出Excel文件");
                      return ERROR;
                  }
             }else{
                 System.out.println("统计数据不存在");
                 return ERROR;
             }
     }
 }

 

struts文件:

 <action name="download" class="OutputExcelAction">
     <result name="success" type="stream">
         <param name="contentType">application/vnd.ms-excel</param>
         <param name="inputName">inputExcel</param>
         <param name="contentDisposition">attachment;filename="${#request['filename']}"</param>
         <param name="bufferSize">8192</param>
     </result>
 </action>