Java实现文件点击没反应的方法

ext.ajax.request({

url : '/yjy/training/trainingtimeaction.do?method=downloadattchbyid' ,

params : {

timeid : timeids

},

success : function(response,options){

var result = ext.util.json.decode(response.responsetext);

ext.msg.alert( "下载成功" );

},

failure :function(response,options){

var result = ext.util.json.decode(response.responsetext);

ext.msg.alert( "下载失败" +result.message);

}

});

string timeid = request.getparameter( "timeid" );

       string sql = "select doc_name from cper.ehrtrain_item_document where item_id = ?" ;

       dbhelper dbhelper = new dbhelper();

       object[] params = new object[]{timeid};

       string filename = (string)dbhelper.runsqlscalar(sql, params);

       string filepath = serverpathutil.getpathroot()+ "web-inf/cache/train_item_file/train_item_file_" +timeid+ "/" +filename;

       file file = new file(filepath);

       if (!file.exists()){

         logger.debug( "文件不存在" );

         throw new ioexception( "the file not exists" );

       }

       response.setcontentlength(( int ) file.length());

       outputstream o = response.getoutputstream();

       byte b[] = new byte [ 5000 ];

       //response.setcontenttype("application/x-msdownload");

       response.setcontenttype( "application/vnd.ms-excel" );

       response.setcontentlength(( int )file.length());

       response.setheader( "content-disposition" , "attachment; filename=" +filename);

       fileinputstream in = new fileinputstream(file);

       int n;

       while ((n = in.read(b)) != - 1 ) {

         o.write(b, 0 , n);

       }

       in.close();

     } catch (exception e){

       e.printstacktrace();

     }

window.open( '/yjy/training/trainingtimeaction.do?method=downloadattchbyid&timeid=' + timeids);