<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %>
<html:html>
<html:button property="button" onclick="printAll()">
DownLoad
</html:button>
</html:html>
<script language='javascript'>
function printAll(){ location.href="<%=request.getContextPath()%><%=request.getContextPath()%>/download.do"; }
</script>

DownloadAction.java

import org.apache.struts.action.*;
import javax.servlet.http.*;
import java.io.OutputStream;
import test.whw.upload.ExcelBean;
/**
 * <p>Title:DownloadAction </p>
 * <p>Description: QRRSMMS </p>
 * <p>Copyright: Copyright (c) 2004 jiahansoft</p>
 * <p>Company: jiahansoft</p>
 * @author wanghw
 * @version 1.0
 */

public class DownloadAction extends Action {
  public ActionForward execute(ActionMapping mapping,
                               ActionForm form,
                               HttpServletRequest request,
                               HttpServletResponse response)
      throws Exception {
    try{
      String fname = "test";//Excel文件名
      OutputStream os = response.getOutputStream();//取得输出流
      response.reset();//清空输出流
      response.setHeader("Content-disposition", "attachment; filename=" + fname + ".xls");//设定输出文件头
      response.setContentType("application/msexcel");//定义输出类型
      ExcelBean eb = new ExcelBean();
      eb.expordExcel(os);//调用生成excel文件bean
    }catch(Exception e){
      System.out.println(e);
    }

    return mapping.findForward("display");
  }
}

ExcelBean.java

package test.whw.upload;
import java.io.*;
import jxl.*;
import jxl.write.*;
import jxl.format.*;
import java.util.*;
import java.awt.Color;

public class ExcelBean {
  public ExcelBean(){}
  public String expordExcel(OutputStream os)throws Exception{
    jxl.write.WritableWorkbook wbook = Workbook.createWorkbook(os); //建立excel文件
    String tmptitle = "测试文件"; //标题
    jxl.write.WritableSheet wsheet = wbook.createSheet("第一页", 0); //sheet名称
    //设置excel标题
    jxl.write.WritableFont wfont = new jxl.write.WritableFont(
        WritableFont.ARIAL, 16,
        WritableFont.BOLD, false, jxl.format.UnderlineStyle.NO_UNDERLINE,
        jxl.format.Colour.BLACK);
    jxl.write.WritableCellFormat wcfFC = new jxl.write.WritableCellFormat(
        wfont);
    jxl.write.Label wlabel1;
    wlabel1 = new jxl.write.Label(5, 0, tmptitle, wcfFC);
    wsheet.addCell(wlabel1);
    wfont = new jxl.write.WritableFont(
        WritableFont.ARIAL, 14,
        WritableFont.BOLD, false, jxl.format.UnderlineStyle.NO_UNDERLINE,
        jxl.format.Colour.BLACK);
    wcfFC = new jxl.write.WritableCellFormat(
        wfont);
    jxl.write.Label wlabel;
    wlabel = new jxl.write.Label(0, 0, "写入内容");
    wsheet.addCell(wlabel); //
    wbook.write(); //写入文件
    wbook.close();
    os.close();
    return "success";
  }
}

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/**
 * <p>Title:UpLoadAction</p>
 * <p>Description: QRRSMMS </p>
 * <p>Copyright: Copyright (c) 2004 jiahansoft</p>
 * <p>Company: jiahansoft</p>
 * @author wanghw
 * @version 1.0
 */

public class UpLoadAction extends Action {
  public ActionForward execute(ActionMapping mapping,
                               ActionForm form,
                               HttpServletRequest request,
                               HttpServletResponse response)
      throws Exception {
    if (form instanceof uploadsForm) {//如果form是uploadsForm
        String encoding = request.getCharacterEncoding();
        if ((encoding != null) && (encoding.equalsIgnoreCase("utf-8")))
        {
            response.setContentType("text/html; charset=gb2312");//如果没有指定编码，编码格式为gb2312
        }
        UpLoadForm theForm = (UpLoadForm ) form;
        FormFile file = theForm.getTheFile();//取得上传的文件
        try {
          InputStream stream = file.getInputStream();//把文件读入
          String filePath = request.getRealPath("/");//取当前系统路径
          ByteArrayOutputStream baos = new ByteArrayOutputStream();
          OutputStream bos = new FileOutputStream(filePath + "/" +
                                                  file.getFileName());//建立一个上传文件的输出流
          //System.out.println(filePath+"/"+file.getFileName());
          int bytesRead = 0;
          byte[] buffer = new byte[8192];
          while ( (bytesRead = stream.read(buffer, 0, 8192)) != -1) {
            bos.write(buffer, 0, bytesRead);//将文件写入服务器
          }
          bos.close();
          stream.close();
        }catch(Exception e){
          System.err.print(e);
        }
        //request.setAttribute("dat",file.getFileName());
        return mapping.findForward("display");
    }
    return null;
  }
}

import javax.servlet.http.HttpServletRequest;
import org.apache.struts.action.*;
import org.apache.struts.upload.*;

/**
 * <p>Title:UpLoadForm</p>
 * <p>Description: QRRSMMS </p>
 * <p>Copyright: Copyright (c) 2004 jiahansoft</p>
 * <p>Company: jiahansoft</p>
 * @author wanghw
 * @version 1.0
 */

public class UpLoadForm extends ActionForm {
  public static final String ERROR_PROPERTY_MAX_LENGTH_EXCEEDED = "org.apache.struts.webapp.upload.MaxLengthExceeded";
  protected FormFile theFile;
  public FormFile getTheFile() {
      return theFile;
  }
  public void setTheFile(FormFile theFile) {
      this.theFile = theFile;
  }
  public ActionErrors validate(ActionMapping mapping, HttpServletRequest request)
  {
      ActionErrors errors = null;
      //has the maximum length been exceeded?
      Boolean maxLengthExceeded = (Boolean)
              request.getAttribute(MultipartRequestHandler.ATTRIBUTE_MAX_LENGTH_EXCEEDED);
      if ((maxLengthExceeded != null) && (maxLengthExceeded.booleanValue()))
      {
          errors = new ActionErrors();
          errors.add(ERROR_PROPERTY_MAX_LENGTH_EXCEEDED, new ActionError("maxLengthExceeded"));
      }
      return errors;

  }
}
//这是相对应的form，还有其他属性可以设置，具体可以参考struts的上传例子。

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