Ext文件下载
<form id="tagRuleDownloadForm" action=""></form> //下载规则文件接口function downloadTagRuleFile(fileName){var url = '/tagrule?fileName=' + fileName;Ext.Ajax.request({//下载之前先判断一下文件存不存在;url: url + "&checkFileExist=checkFileExist",params: {checkFileExist: 'checkFileExist'}, //这样参数没有传过去method: 'PUT', //这里自己改，因为需要才写成这样的！callback: function(op, suc, resp){alert(resp.responseText);if(suc){//'success':false,'message':'file not found!'var ret = eval("(" + resp.responseText + ")");if(ret.success){//下载文件;var downloadForm = document.getElementById("tagRuleDownloadForm");downloadForm.action = url; downloadForm.method = "POST"; downloadForm.submit();}else{Ext.Msg.alert(TagRulerRes.TIP, ret.message);}}else{Ext.Msg.alert(TagRulerRes.TIP, TagRulerRes.DOWNLOAD_FAILURE);}}});}下的servlet方法:
/** * 文件下载 * 查看，修改规则时下载规则文件; */ public void downloadFile(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html"); String fileName = request.getParameter("fileName"); if(fileName == null || fileName.length() == 0) { log.info("文件不存在! fileName is null !"); this.responseText("{'success':false,'message':'" + ResourceCfg.getResourceMessage(String.valueOf(ErrorCode.ADFILE_NOT_EXISTS)) + "'}", response); return ; } String checkFileExist = request.getParameter("checkFileExist"); String svrFilePath = (MATRIX_BAK_DIRMATRIX_BAK_DIR + fileName).replace("\\", "/"); File file = new File(svrFilePath); if (!file.exists()) { log.info("文件不存在! path:" + file.getAbsolutePath()); this.responseText("{'success':false,'message':'" + ResourceCfg.getResourceMessage(String.valueOf(ErrorCode.ADFILE_NOT_EXISTS)) + "'}", response); } else { if (checkFileExist != null && checkFileExist.equals("checkFileExist")) { log.info("文件存在! path:" + file.getAbsolutePath()); this.responseText("{'success':true,'message':''}", response); } else { //写文件到网流; responseFile(response, fileName, svrFilePath); } } }
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