jsp導出excel poi

<% @ page language = " java "  contentType = " text/html;charset=gb2312 " %>
<% @ page language = " java "
     import = " java.util.*,org.apache.poi.hssf.usermodel.HSSFWorkbook,org.apache.poi.hssf.usermodel.HSSFSheet,org.apache.poi.hssf.usermodel.HSSFRow,org.apache.poi.hssf.usermodel.HSSFCell " %>
<%
    response.setContentType( " APPLICATION/OCTET-STREAM " );
    response.setHeader( " Content-Disposition " ,
             " attachment; filename=/ " test.xls "  +

             " / "" );

    HSSFWorkbook wb  =   new  HSSFWorkbook();
    HSSFSheet sheet  =  wb.createSheet( " sheet1 " );

     // 以下以寫表頭
     // 表頭爲第一行
    HSSFRow row  =  sheet.createRow(( short )  0 );

    HSSFCell cell1  =  row.createCell(( short )  0 );
    HSSFCell cell2  =  row.createCell(( short )  1 );
    HSSFCell cell3  =  row.createCell(( short )  2 );

    cell1.setEncoding(( short )  1 );
    cell1.setCellType( 1 );
    cell2.setEncoding(( short )  1 );
    cell2.setCellType( 1 );
    cell3.setEncoding(( short )  1 );
    cell3.setCellType( 1 );

     // 定義表頭的內容
    cell1.setCellValue( " 測試 " );
    cell2.setCellValue( " 測試2 " );
    cell3.setCellValue( " 測試3 " );

     for  ( int  i  =   0 ; i  <   4 ; i ++ )  {
         // 定義數據從第二行開始       
        row  =  sheet.createRow(( short ) i  +   1 );
        cell1  =  row.createCell(( short )  0 );
        cell2  =  row.createCell(( short )  1 );
        cell3  =  row.createCell(( short )  2 );

        cell1.setEncoding(( short )  1 );
        cell1.setCellType( 1 );
        cell2.setEncoding(( short )  1 );
        cell2.setCellType( 1 );
        cell3.setEncoding(( short )  1 );
        cell3.setCellType( 1 );

         // 填充內容

        cell1.setCellValue( " ggg " );
        cell2.setCellValue( " 00000 " );
        cell3.setCellValue( " adfasdf " );

    }
    wb.write(response.getOutputStream());
    response.getOutputStream().flush();
    response.getOutputStream().close();
%>