struts2导出excel

public String ExcelExport() throws Exception{ 
     
    HttpServletResponse response = ServletActionContext.getResponse(); 
    // 定义request ,response. 
 
    // 查询下载附件. 
    // 设置下载头信息.begin 
    response.setCharacterEncoding("UTF-8"); 
    response.setContentType("file"); 
    response.setHeader("Content-Disposition", "attachment; filename="+ new String("报表.xls".getBytes("GB2312"), "iso8859-1")); 
    // 这个地方一定要进行编码的转换要不然中文字符会出现乱码. 
    // 设置下载头信息.end, 
    HttpServletRequest request = ServletActionContext.getRequest(); 
 
    OutputStream output = null; 
    InputStream fis = null; 
    try { 
        output = response.getOutputStream(); 
        jxl.write.WritableWorkbook wwb = Workbook.createWorkbook(output); 
        jxl.write.WritableSheet ws = wwb.createSheet("各项产品月销售收入统计汇总表 ", 0); 
 
         
        WritableFont wf = new WritableFont(WritableFont.ARIAL, 10, 
                 WritableFont.BOLD, false, UnderlineStyle.NO_UNDERLINE, 
                 jxl.format.Colour.BLACK); // 定义格式 字体 下划线 斜体 粗体 颜色 
         
        //创建格式化对象实例     
        WritableCellFormat totalx2Format = new WritableCellFormat(wf);     
              
        //垂直居中     
        totalx2Format.setVerticalAlignment(VerticalAlignment.CENTRE);     
              
        //水平居中     
        totalx2Format.setAlignment(Alignment.CENTRE);  
         
         
 
         
        // 设置标题.ws.addCell(new jxl.write.Label(列, 行, 内容.)); 
         
        ws.addCell(new Label(0, 1, "单位名称",totalx2Format)); 
        ws.addCell(new Label(1, 1, "神州通(含邮政汇款)",totalx2Format)); 
        ws.addCell(new Label(7, 1, "充值卡",totalx2Format)); 
        ws.addCell(new Label(13, 1, "在线定卡",totalx2Format)); 
        ws.addCell(new Label(15, 1, "本月销售总金额(单位：元)",totalx2Format)); 
 
        ws.addCell(new Label(1, 2, "20元面值",totalx2Format)); 
        ws.addCell(new Label(3, 2, "25元面值",totalx2Format)); 
        ws.addCell(new Label(5, 2, "50元面值",totalx2Format)); 
        ws.addCell(new Label(7, 2, "30元面值",totalx2Format)); 
        ws.addCell(new Label(9, 2, "50元面值",totalx2Format)); 
        ws.addCell(new Label(11, 2, "100元面值",totalx2Format)); 
        ws.addCell(new Label(13, 2, "数量(张)",totalx2Format)); 
        ws.addCell(new Label(14, 2, "金额(元)",totalx2Format)); 
         
         
        ws.addCell(new Label(1, 3, "数量(张)",totalx2Format)); 
        ws.addCell(new Label(2, 3, "金额(元)",totalx2Format)); 
        ws.addCell(new Label(3, 3, "数量(张)",totalx2Format)); 
        ws.addCell(new Label(4, 3, "金额(元)",totalx2Format)); 
        ws.addCell(new Label(5, 3, "数量(张)",totalx2Format)); 
        ws.addCell(new Label(6, 3, "金额(元)",totalx2Format)); 
        ws.addCell(new Label(7, 3, "数量(张)",totalx2Format)); 
        ws.addCell(new Label(8, 3, "金额(元)",totalx2Format)); 
        ws.addCell(new Label(9, 3, "数量(张)",totalx2Format)); 
        ws.addCell(new Label(10, 3, "金额(元)",totalx2Format)); 
        ws.addCell(new Label(11, 3, "数量(张)",totalx2Format)); 
        ws.addCell(new Label(12, 3, "金额(元)",totalx2Format)); 
 
        ws.mergeCells(0, 1, 0, 3); //合并单元格，参数格式（开始列，开始行，结束列，结束行） 
        ws.mergeCells(1, 1, 6, 1); 
        ws.mergeCells(7, 1, 12, 1); 
        ws.mergeCells(13, 1, 14, 1); 
         
        ws.mergeCells(1, 2, 2, 2); 
        ws.mergeCells(3, 2, 4, 2); 
        ws.mergeCells(5, 2, 6, 2); 
        ws.mergeCells(7, 2, 8, 2); 
        ws.mergeCells(9, 2, 10, 2); 
        ws.mergeCells(11, 2, 12, 2); 
         
        ws.mergeCells(13, 2, 13, 3); 
        ws.mergeCells(14, 2, 14, 3); 
         
        ws.mergeCells(15, 1, 15, 3); 
 
        ws.setColumnView(0, 15); 
        ws.setColumnView(1, 10); 
 
        ws.setColumnView(2, 10); 
        ws.setColumnView(3, 10); 
        ws.setColumnView(4, 10); 
        ws.setColumnView(5, 10); 
        ws.setColumnView(6, 10); 
        ws.setColumnView(7, 10); 
        ws.setColumnView(8, 10); 
        ws.setColumnView(9, 10); 
        ws.setColumnView(10, 10); 
        ws.setColumnView(11, 10); 
        ws.setColumnView(12, 10); 
        ws.setColumnView(13, 10); 
        ws.setColumnView(14, 10); 
        ws.setColumnView(15, 15); 
 
         
        beginDate = request.getParameter("beginDate"); 
        endDate = request.getParameter("endDate"); 
        orgname = request.getParameter("orgname"); 
         
         
         
        data = createQuery( beginDate, endDate, orgname); 
        for (int i = 0; i < data.size(); i++) { 
            DynaBean dynaBean = (DynaBean)data.get(i); 
            String orgname = StringUtil.parseNull( dynaBean.get("orgname")) ; 
            String c_amount20 = StringUtil.parseNull( dynaBean.get("c_amount20")); 
            String c_paymoney20 = StringUtil.parseNumber( dynaBean.get("c_paymoney20")); 
            String c_amount25 = StringUtil.parseNull( dynaBean.get("c_amount25")); 
            String c_paymoney25 = StringUtil.parseNumber( dynaBean.get("c_paymoney25")); 
            String c_amount50 = StringUtil.parseNull( dynaBean.get("c_amount50")); 
            String c_paymoney50 = StringUtil.parseNumber( dynaBean.get("c_paymoney50"));     
            String v_amount30 = StringUtil.parseNull( dynaBean.get("v_amount30")); 
            String v_paymoney30 = StringUtil.parseNumber( dynaBean.get("v_paymoney30")); 
            String v_amount50 = StringUtil.parseNull( dynaBean.get("v_amount50")); 
            String v_paymoney50 = StringUtil.parseNumber( dynaBean.get("v_paymoney50")); 
            String v_amount100 = StringUtil.parseNull( dynaBean.get("v_amount100")); 
            String v_paymoney100 = StringUtil.parseNumber( dynaBean.get("v_paymoney100"));   
            String c_amountonline = StringUtil.parseNull( dynaBean.get("c_amountonline")); 
            String c_paymoneyonline = StringUtil.parseNumber( dynaBean.get("c_paymoneyonline")); 
             
            String totle =  
                StringUtil.parseNumber(Double.parseDouble(c_paymoney20) 
                     + Double.parseDouble(c_paymoney25)  
                     + Double.parseDouble(c_paymoney50)  
                     + Double.parseDouble(v_paymoney30) 
                     + Double.parseDouble(v_paymoney50)  
                     + Double.parseDouble(v_paymoney100)  
                     + Double.parseDouble(c_paymoneyonline)); 
         
             
            WritableCellFormat numberFormat = new WritableCellFormat();     
              
  
            numberFormat.setAlignment(Alignment.RIGHT);  
             
            ws.addCell(new Label(0, i + 4, orgname)); 
            ws.addCell(new Label(1, i + 4, c_amount20,numberFormat)); 
            ws.addCell(new Label(2, i + 4, c_paymoney20,numberFormat)); 
            ws.addCell(new Label(3, i + 4, c_amount25,numberFormat)); 
            ws.addCell(new Label(4, i + 4, c_paymoney25,numberFormat)); 
            ws.addCell(new Label(5, i + 4, c_amount50,numberFormat)); 
            ws.addCell(new Label(6, i + 4, c_paymoney50,numberFormat)); 
            ws.addCell(new Label(7, i + 4, v_amount30,numberFormat)); 
            ws.addCell(new Label(8, i + 4, v_paymoney30,numberFormat)); 
            ws.addCell(new Label(9, i + 4, v_amount50,numberFormat)); 
            ws.addCell(new Label(10, i + 4,v_paymoney50,numberFormat)); 
            ws.addCell(new Label(11, i + 4,v_amount100,numberFormat)); 
            ws.addCell(new Label(12, i + 4,v_paymoney100,numberFormat)); 
            ws.addCell(new Label(13, i + 4,c_amountonline,numberFormat)); 
            ws.addCell(new Label(14, i + 4,c_paymoneyonline,numberFormat)); 
            ws.addCell(new Label(15, i + 4,totle,numberFormat)); 
        } 
 
        wwb.write(); 
        wwb.close(); 
 
    }