extjs 文件下載

pint 2012-05-29

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圖二

這個用到了response對象的contenttype,保存不同的文件需要不同的contenttype（具體可上網(wǎng)查）。

點擊備份執(zhí)行backUpSmu()函數(shù)具體實現(xiàn)如下：

function backUpSmu(){
   Ext.Msg.wait('提示','正在備份,請稍后...');
   Ext.Ajax.request({
      success:function(res){
    //alert(res.responseText);

    //通過執(zhí)行window.open（）來打開一個下載框圖二
    window.open('group.do?method=download&&fileName='+res.responseText);
    Ext.Msg.hide();
   }
  });
}

java后臺執(zhí)行流操作。進入action group的download（）方法。

public ActionForward download(ActionMapping mapping, ActionForm form,
   HttpServletRequest request,
   HttpServletResponse response) {
  try {
   request.setCharacterEncoding("iso-8859-1");
  } catch (UnsupportedEncodingException e1) {
   // TODO Auto-generated catch block
   e1.printStackTrace();
  }
  String fileName = request.getParameter( "fileName" );
  BufferedInputStream bis = null;
  BufferedOutputStream bos = null;
  OutputStream os = null;
  InputStream is = null;
  String filePath = servlet.getServletContext().getRealPath("/" + ROOT + fileName);//項目路徑

        try
        {
        File downloadFile = new File(filePath);
        is = new FileInputStream(downloadFile);
        bis = new BufferedInputStream(is);
        os = response.getOutputStream();
        bos = new BufferedOutputStream(os);

        fileName = java.net.URLEncoder.encode(fileName, "UTF-8");//處理中文文件名的問題
        fileName = new String(fileName.getBytes("UTF-8"),"GBK");//處理中文文件名的問題

            response.reset();
            response.setCharacterEncoding("utf-8");
            response.setContentType("application/octet-stream");//文件類型contenttype
            response.setHeader("Content-Disposition","attachment; filename=" + fileName); //關(guān)鍵部分，打開一個下載框

            int bytesRead = 0;
        byte[] buffer = new byte[8192];

        while((bytesRead = bis.read(buffer,0,8192)) != -1)
        {
          bos.write(buffer, 0, bytesRead);
        }
        bos.flush();
        is.close();
        bis.close();
        os.close();
        bos.close();
        }
        catch(Exception e){
        e.printStackTrace();
        }
        System.gc();
        return null;
}