Ext导出EXCEL，前后台代码

前台

new Ext.Button({
   text:'导出EXCEL',
   handler:function(){
      var appWindow = window.open("getExecl.do"); //调action得到数据生成execl格式的数据，response发往前台 
       appWindow.focus();
   }
})

后台:  filename是导出的文件名，heads是excel表头,datalist是数据

public void createExcelStream(HttpServletResponse response,String filename,String[] heads,List<String[]> datalist){ 
  try{
   OutputStream os = response.getOutputStream();  
   WritableWorkbook wbook = Workbook.createWorkbook(os);  
   WritableSheet wsheet = wbook.createSheet(filename, 0);  
   for(int i=0 ; i<heads.length ; i++) {
    Label label =new  Label(i,0 ,heads[i]);
    wsheet.addCell(label);
   }
   for(int i=0 ;i<datalist.size();i++) {
    for(int j=0 ; j<datalist.get(i).length ; j++){
     Label label =new  Label(j,i+1 ,datalist.get(i)[j]);
     wsheet.addCell(label); 
    }
   }
   response.setHeader("Content-disposition","attachment;" +
     "filename="+ new String(filename.getBytes("GBK"), "ISO_8859_1") +".xls");  
   response.setContentType("application/vnd.ms-excel");  
   wbook.write();  
   wbook.close();  
   os.close();
  }catch(Exception e){
   e.printStackTrace();
  }
} }