考虑浏览器兼容的文件上传(IE8不支持FormData)
方法一:使用FormData(因IE8不支持FormData, IE10才支持,因此此方法不兼容IE10以下的IE浏览器)
也可参考文章 http://www.jianshu.com/p/46e6e03a0d53
html:
<input type="file" class="form-control" id="inputfile" title="多个文件请打包后再上传" style="display:inline-block;width:100%;_overflow:hidden;" />
js:
//新增行的保存及上传文件 function uploadFile(data) { var fileObj = document.getElementById("inputfile").files; // js 获取文件对象 var FileController = "/action/add"; // 接收上传文件的后台地址 var form = new FormData(); //20160301 添加其他参数 form.append("param1",param1); form.append("param2",param2); if (fileObj.length != 0) { var i = fileObj.length; for (var j = 0; j < i; j++) { form.append("file" + j, fileObj[j]); // 文件对象 } } form.append("data", data); // XMLHttpRequest 对象 xmlHttpRequest = new XMLHttpRequest(); xmlHttpRequest.onreadystatechange = callback; xmlHttpRequest.open("post", FileController, true); /* event listeners */ // 进度条 // xmlHttpRequest.upload.addEventListener("progress", progressFunction, false); // xmlHttpRequest.addEventListener("load", uploadComplete, false); // xmlHttpRequest.addEventListener("error", uploadFailed, false); // xmlHttpRequest.addEventListener("abort", uploadCanceled, false); /* end listeners */ xmlHttpRequest.send(form); } function callback() { // 接收响应数据 // 判断对象状态是否交互完成,如果为4则交互完成 if (xmlHttpRequest.readyState == 4) { // 判断对象状态是否交互成功,如果成功则为200 if (xmlHttpRequest.status == 200) { // 接收数据,得到服务器输出的纯文本数据 var response = xmlHttpRequest.responseText; //console.log(response); if(response == 1) { enabledButton(); alert("保存成功!"); } else { alert("保存失败,请重新尝试!"); } enableButton(); }else{//!=200 alert("保存失败!"); enableButton(); } } }
方法二:使用form提交 兼容各种浏览器,form提交后会刷新页面,且不太好获取返回参数。如要返回原始页面,需要用response.sendRedirect(原始页面url)
进行转向。
html:
<form id="uploadFileForm" name="uploadFileForm" enctype="multipart/form-data" method="post"> <input type="hidden" id="param1" name="param1" value="123"/> <input type="hidden" id="param2" name="param2" value="测试参数"/> <div id="uploadFileTableDiv" style="margin-left:10%;"> <table border="1" width="80%"> <tr> <td style="padding:10px;"> <span style="float:left;">上传文件: </span> </td> <td style="padding:10px;"> <input type="file" id="attach" name="attach" size="25" style="height:30px;" /> </td> </tr> <tr> <td colspan="2" style="padding:10px;padding-left:50px;"> <button id="submit_btn" type="button" class="btn btn-default" onclick="javascript:submitFile();"> 上传文件 </button> </td> </tr> </table> </div> </form>
js:
//20160612 文件上传按钮 form表单提交 function submitFile(){ var attach = document.getElementById("attach").value; alert("attach: " + attach); if(attach == undefined || attach == ""){ alert("请选择文件"); return; } uploadFileForm.action = "/tools/uploadFileAction"; uploadFileForm.submit(); }
方法三:使用jquery.form.js支持的ajaxsubmit进行文件上传
htm
<script th:src="@{/jquery/3.46.0/jquery.form.js}"></script> <form id="uploadFileForm2" name="uploadFileForm2" enctype="multipart/form-data" method="post"> <div id="uploadFileTableDiv2" style="margin-left:10%;"> <table border="1" width="80%"> <tr> <td style="padding:10px;"> <span style="float:left;">上传文件: </span> </td> <td style="padding:10px;"> <input type="file" id="attach2" name="attach2" size="25" style="height:30px;" /> </td> </tr> <tr> <td colspan="2" style="padding:10px;padding-left:50px;"> <button id="submit_btn2" type="button" class="btn btn-default" onclick="javascript:ajaxSubmitFile();"> 上传文件 </button> </td> </tr> </table> </div> </form>
js:
//在表单上追加input hidden元素 存放其他参数 function appendInputElementForForm(formId,inputName,inputValue){ var myh = document.createElement("input"); myh.type = "hidden"; myh.value = inputValue; myh.id = inputName; myh.name = inputName; document.getElementById(formId).appendChild(myh); alert(document.getElementById(inputName).value); } //20170207 文件上传ajax Form表单提交 function ajaxSubmitFile(){ var attach = document.getElementById("attach2").value; alert("ajaxSubmitFile attach2: " + attach); if(attach == undefined || attach == ""){ alert("请选择文件"); return; } appendInputElementForForm( "uploadFileForm2", "param1", "123"); appendInputElementForForm( "uploadFileForm2", "param2", "测试参数"); $('#uploadFileForm2').ajaxSubmit({ type:"post", url:"/tools/ajaxUploadFileAction", data:$('#uploadFileForm2').serialize(), dataType:"json", error:function(data){ alert(data); }, success:function(data){ alert("ajaxSubmit上传成功"); alert("下载地址: " + data.data.attachment); } }); }
最后附带上后台的java代码:
//20160612 文件上传 @RequestMapping(value = "ajaxUploadFileAction") public ModelAndView ajaxUploadFile(HttpServletRequest request, HttpServletResponse response) throws Exception{ ResponseInfo responseInfo = new ResponseInfo(); logger.info("ajaxUploadFile param1: " + request.getParameter("param1")); logger.info("ajaxUploadFile param2: " + request.getParameter("param2")); try { //将当前上下文初始化给CommonsMutipartResolver (多部分解析器) CommonsMultipartResolver multipartResolver=new CommonsMultipartResolver( request.getSession().getServletContext()); // 判断是否是多数据段提交格式 if (multipartResolver.isMultipart(request)) { MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest)request; logger.info("ajaxUploadFile param1: " + multiRequest.getParameter("param1")); logger.info("ajaxUploadFile param2: " + multiRequest.getParameter("param2")); Iterator<String> iter = multiRequest.getFileNames(); logger.info("iter.hasNext(): "+iter.hasNext()); Integer fileCount = 0; while (iter.hasNext()) { MultipartFile multipartFile = multiRequest.getFile(iter.next()); String fileName = multipartFile.getOriginalFilename(); logger.info("upload demand filename: " + fileName ); //20170207 针对IE环境下filename是整个文件路径的情况而做以下处理 Integer index = fileName.lastIndexOf("\\"); String newStr = ""; if(index>-1){ newStr = fileName.substring(index+1); }else{ newStr = fileName; } if(!newStr.equals("")){ fileName = newStr; } logger.info("new filename: " + fileName ); if (multipartFile != null) { HashMap<String,Object> result = DispatchInterfaceUtil.uploadFileByInputStream (multipartFile.getInputStream(),multipartFile.getSize(),fileName); Integer statusCode = (Integer)result.get("statusCode"); logger.info("statusCode: " + statusCode); if( statusCode.equals(0) ){ String attachment = (String)result.get("attachment"); responseInfo. setStatus(true); responseInfo.put("attachment", attachment); }else{ String errorMessage = (String)result.get("errorMessage"); logger.error( "errorMessage: " + errorMessage); responseInfo.setStatus(false); responseInfo.setMsg("文件上传失败"); } } fileCount++; }//while logger.info("fileCount: " + fileCount); } }catch (Exception e) { // TODO: handle exception responseInfo.setStatus(false); responseInfo.setMsg("后台出现异常"); logger.warn("Error: ", e); } response.setContentType("text/html; charset=utf-8"); response.getWriter().write( JSON.toJSONString(responseInfo)); return null; }
注意:
(1)IE10可以支持application/json格式的Response了,也就是说低于IE10版本一下的IE浏览器都需要使用text/html格式的Response。 在Response头中指定Content-Type为text/html,是可以解决问题的。这样返回给客户端的是一个JSON字符串(并非JSON对象),无需IE来解析。
(2)通过js动态添加的input file元素是无法通过form submit的方式(如上所述的后两种方法)将文件内容提交给后台进行文件上传的,因为后台服务器根本不知道有此元素. 若需要动态添加,可以先在html页面中添加上不可见的input file元素(这样后台服务器就知道了该元素的存在), 需要添加时再通过js语句 document.getElementById(父元素ID).appendChild(inputFile元素对象)
将input file对象添加在适当位置
(3)在$.each代码块内不能使用break和continue,要实现break和continue的功能的话,要使用其它的方式:
break—-用return false;
continue –用return true;