附件下载（包括图片,exl,word）在前台必须给出一个iframe 或者类似于window的窗口，另外，Java文件下载不能通过ajax进行请求，必须添加src属性首选，前台的链接拼接html如下：
'<a id="attach_name'+index+'" style="width:100%" class="downloadAttach btn btn-primary"><i class="fa fa-file"></i> '+row.ATTACH_NAME+'</a>'+ '<iframe id="downloadFrame'+index+'" style="display:none;"></iframe>'
然后click事件如下：
//TODO 事件委托，下载附件按钮 $(".taskRows").on("click",".downloadAttach",function(){ var attachIndex = $(this).attr("id")//获取当前点击的元素ID attachIndex = attachIndex.charAt(attachIndex.length-1); var attach_name = $.trim($("#attach_name"+attachIndex).text()); alert(attach_name); //根据附件名下载附件 if(attach_name!=null &&attach_name!=undefined) { //$("#downloadFrame"+attachIndex).attr("src",baseCtx+"/wpgl/downloadAttachFile.action?attachName="+attachName); $("#downloadFrame"+attachIndex).attr("src",baseCtx+"/wpgl/downloadAttachFile.action?Id="+Id+"&attachName="+encodeURI(encodeURI(attachName))); } }); //action 后台一些主要的包和类 import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.io.OutputStream; import java.io.UnsupportedEncodingException; import java.util.ArrayList; import java.util.Date; import java.util.HashMap; import java.util.List; import java.util.Map; import java.net.URLDecoder; import java.net.URLEncoder; /** * 下载文件 * @return * @throws UnsupportedEncodingException */ @Action(value="downloadAttachFile") public String downloadAttachFile(){ //从前台传过来的附件名字：格式是，“2006#系统测试.docx格式" String downloadName =wpyId+"#"+attachName; //传入的数据 System.out.println(downloadName); try { OutputStream os = this.response.getOutputStream(); //OutputStream os = this.getResponse().getOutputStream(); if (Util.isIE(this.request)) //判断客户端是否为IE { //编码 downloadName = URLEncoder.encode(downloadName, "UTF-8"); } else { downloadName = new String(downloadName.getBytes("UTF-8"),"iso-8859-1"); } //设置让浏览器弹出下载对话框的Header this.response.setContentType("application/x-download"); this.response.addHeader("Content-Disposition","attachment;filename=\"" + downloadName + "\""); this.response.flushBuffer(); //将前台的数据经过包装后（加了头数据，并经过编码）需要解码 String downloadName1 =URLDecoder.decode(downloadName, "UTF-8"); System.out.println(downloadName1); //解码的结果输出 String bgFile=realPath + File.separator + downloadName1; FileInputStream fis = new FileInputStream(bgFile); Util.copyStrem(fis, os); fis.close(); os.close(); System.out.println("==========成功了！！==========="); } catch (IOException e) { e.printStackTrace();//在命令行打印异常信息在程序中出错的位置及原因 System.out.println("==========出错了！！==========="); } return NONE; }
转载于:https://www.cnblogs.com/Lxiaojiang/p/6092899.html
