SpringMVC+ajaxFileUpload 相容IE瀏覽器實現非同步上傳圖片
阿新 • • 發佈：2019-01-29
第一次出差到深圳，幫朋友給一個專案收尾，客戶臨時要求上傳檔案的時候順便上傳封面，所以就想到用非同步上傳的方式，然後在前端預覽上傳的圖片，於是就用到了“ajaxFileUpload”這一款基於“jquery”的上傳外掛，剛拿到手的時候去網上查了一下他的用法，然後理所當然的在返回值的時候用json傳遞資料，但是這個時候，IE瀏覽器開始不相容了，報了一個什麼語法錯誤這樣一個錯，後來才發現，IE瀏覽器好像不支援回傳json格式的資料，只能傳回json字串然後轉成json物件，於是在這裡記錄一下程式碼，以便重複利用。
js部分
function deletimg(){ $("#img").css("display","none"); $("#imgText").val(""); $("#img")[0].src=""; $("#imgfile").css("display","block"); $("#delimg").css("display","none"); } function uploadImg(){ var f = $("#imgfile").val(); var extname = f.substring(f.lastIndexOf(".")+1,f.length); extname = extname.toLowerCase();//處理了大小寫 if(extname!= "jpeg"&&extname!= "jpg"&&extname!= "gif"&&extname!= "png"){ alert("格式不正確,支援的圖片格式為：JPEG、GIF、PNG！"); return false; } var file = document.getElementById("imgfile").files; var size = file[0].size; if(size>2097152){ alert("所選擇的圖片太大，圖片大小最多支援2M!"); return false; } ajaxFileUploadPic(); } function ajaxFileUploadPic() { $.ajaxFileUpload({ url : 'fileupload/uploadImg', //用於檔案上傳的伺服器端請求地址 secureuri : false, //一般設定為false fileElementId : "imgfile", //檔案上傳空間的id屬性 <input type="file" id="file" name="file" /> type : 'post', dataType : 'text', //返回值型別 一般設定為json success : function(data, status) //伺服器成功響應處理函式 { alert(data); var obj = eval('(' + data + ')'); if(obj.result=="success"){ $("#img").css("display","block"); $("#imgText").val(obj.url); $("#img")[0].src=obj.url; $("#imgfile").css("display","none"); $("#delimg").css("display","block"); }else{ alert("圖片上傳失敗，請重試。錯誤原因："+obj.msg); } }, error : function(data, status, e)//伺服器響應失敗處理函式 { alert("圖片上傳失敗，請重試。"); //alert(data); //alert(e); } }); return false; }
jsp部分
Controller部分<input type="file" name="imgfile" id="imgfile" placeholder="請選擇封面檔案" onchange="uploadImg()"> <img id="img" style="height:100px;width:auto;display:none;"> <input type="hidden" id="imgfileText"> <input type="button" id="delimg" onclick="deletimg()" value="刪除圖片" style="display:none">
@RequestMapping(value = "/uploadImg") public Map<String, Object> uploadImg2(HttpServletRequest request, HttpServletResponse response, MultipartHttpServletRequest req) { MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request; MultipartFile uploadFile = null; uploadFile = multipartRequest.getFile("imgfile");// 獲取上傳檔名 response.setContentType("text/html;charset=utf-8"); try { //檔案儲存目錄路徑 String savePath = request.getSession().getServletContext().getRealPath("/") + "uploadFiles/KJIMG/"; //檔案儲存目錄URL String saveUrl = request.getContextPath() + "/uploadFiles/KJIMG/"; //檢查目錄 File uploadDir = new File(savePath); if(!uploadDir.isDirectory()){ uploadDir.mkdirs(); } //檢查目錄寫許可權 if(!uploadDir.canWrite()){ response.getWriter().write("{\"result\":\"error\",\"msg\":\"上傳目錄沒有寫許可權。\"}"); return null; } String dirName = request.getParameter("dir"); if (dirName == null) { dirName = "image"; } //建立資料夾 savePath += dirName + "/"; saveUrl += dirName + "/"; File saveDirFile = new File(savePath); if (!saveDirFile.exists()) { saveDirFile.mkdirs(); } SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd"); String ymd = sdf.format(new Date()); savePath += ymd + "/"; saveUrl += ymd + "/"; File dirFile = new File(savePath); if (!dirFile.exists()) { dirFile.mkdirs(); } String fileName = uploadFile.getOriginalFilename(); String fileExt = fileName.substring(fileName.lastIndexOf(".") + 1).toLowerCase(); SimpleDateFormat df = new SimpleDateFormat("yyyyMMddHHmmss"); String newFileName = df.format(new Date()) + "_" + new Random().nextInt(1000) + "." + fileExt; BufferedOutputStream outputStream = new BufferedOutputStream(new FileOutputStream(savePath + newFileName)); FileCopyUtils.copy(uploadFile.getInputStream(), outputStream); response.getWriter().write("{\"result\":\"success\",\"url\":\""+saveUrl + newFileName+"\"}"); } catch (Exception e) { e.printStackTrace(); try { response.getWriter().write("{\"result\":\"error\",\"msg\":\""+e.getMessage()+"\"}"); } catch (IOException e1) { e1.printStackTrace(); } } return null; }
ajaxFileUpload.js部分
jQuery.extend({
handleError: function (s, xhr, status, e) {
if (s.error) {
s.error.call(s.context || s, xhr, status, e);
}
if (s.global) {
(s.context ? jQuery(s.context) : jQuery.event).trigger("ajaxError", [xhr, s, e]);
}
},
httpData: function (xhr, type, s) {
var ct = xhr.getResponseHeader("content-type"),
xml = type == "xml" || !type && ct && ct.indexOf("xml") >= 0,
data = xml ? xhr.responseXML : xhr.responseText;
if (xml && data.documentElement.tagName == "parsererror")
throw "parsererror";
if (s && s.dataFilter)
data = s.dataFilter(data, type);
if (typeof data === "string") {
if (type == "script")
jQuery.globalEval(data);
if (type == "json")
data = window["eval"]("(" + data + ")");
}
return data;
},
createUploadIframe: function(id, uri)
{
//create frame
var frameId = 'jUploadFrame' + id;
if(window.ActiveXObject) {
var io = document.createElement('<iframe id="' + frameId + '" name="' + frameId + '" />');
if(typeof uri== 'boolean'){
io.src = 'javascript:false';
}
else if(typeof uri== 'string'){
io.src = uri;
}
}
else {
var io = document.createElement('iframe');
io.id = frameId;
io.name = frameId;
}
io.style.position = 'absolute';
io.style.top = '-1000px';
io.style.left = '-1000px';
document.body.appendChild(io);
return io
},
createUploadForm: function(id, fileElementId)
{
//create form
var formId = 'jUploadForm' + id;
var fileId = 'jUploadFile' + id;
var form = $('<form action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>');
var oldElement = $('#' + fileElementId);
var newElement = $(oldElement).clone();
$(oldElement).attr('id', fileId);
$(oldElement).before(newElement);
$(oldElement).appendTo(form);
//set attributes
$(form).css('position', 'absolute');
$(form).css('top', '-1200px');
$(form).css('left', '-1200px');
$(form).appendTo('body');
return form;
},
ajaxFileUpload: function(s) {
// TODO introduce global settings, allowing the client to modify them for all requests, not only timeout
s = jQuery.extend({}, jQuery.ajaxSettings, s);
var id = s.fileElementId;
var form = jQuery.createUploadForm(id, s.fileElementId);
var io = jQuery.createUploadIframe(id, s.secureuri);
var frameId = 'jUploadFrame' + id;
var formId = 'jUploadForm' + id;
// Watch for a new set of requests
if ( s.global && ! jQuery.active++ )
{
jQuery.event.trigger( "ajaxStart" );
}
var requestDone = false;
// Create the request object
var xml = {}
if ( s.global )
jQuery.event.trigger("ajaxSend", [xml, s]);
// Wait for a response to come back
var uploadCallback = function(isTimeout)
{
var io = document.getElementById(frameId);
try
{
if(io.contentWindow)
{
xml.responseText = io.contentWindow.document.body?io.contentWindow.document.body.innerHTML:null;
xml.responseXML = io.contentWindow.document.XMLDocument?io.contentWindow.document.XMLDocument:io.contentWindow.document;
}else if(io.contentDocument)
{
xml.responseText = io.contentDocument.document.body?io.contentDocument.document.body.innerHTML:null;
xml.responseXML = io.contentDocument.document.XMLDocument?io.contentDocument.document.XMLDocument:io.contentDocument.document;
}
}catch(e)
{
jQuery.handleError(s, xml, null, e);
}
if ( xml || isTimeout == "timeout")
{
requestDone = true;
var status;
try {
status = isTimeout != "timeout" ? "success" : "error";
// Make sure that the request was successful or notmodified
if ( status != "error" )
{
// process the data (runs the xml through httpData regardless of callback)
var data = jQuery.uploadHttpData( xml, s.dataType );
// If a local callback was specified, fire it and pass it the data
if ( s.success )
s.success( data, status );
// Fire the global callback
if( s.global )
jQuery.event.trigger( "ajaxSuccess", [xml, s] );
} else
jQuery.handleError(s, xml, status);
} catch(e)
{
status = "error";
jQuery.handleError(s, xml, status, e);
}
// The request was completed
if( s.global )
jQuery.event.trigger( "ajaxComplete", [xml, s] );
// Handle the global AJAX counter
if ( s.global && ! --jQuery.active )
jQuery.event.trigger( "ajaxStop" );
// Process result
if ( s.complete )
s.complete(xml, status);
jQuery(io).unbind()
setTimeout(function()
{ try
{
$(io).remove();
$(form).remove();
} catch(e)
{
jQuery.handleError(s, xml, null, e);
}
}, 100)
xml = null
}
}
// Timeout checker
if ( s.timeout > 0 )
{
setTimeout(function(){
// Check to see if the request is still happening
if( !requestDone ) uploadCallback( "timeout" );
}, s.timeout);
}
try
{
// var io = $('#' + frameId);
var form = $('#' + formId);
$(form).attr('action', s.url);
$(form).attr('method', 'POST');
$(form).attr('target', frameId);
if(form.encoding)
{
form.encoding = 'multipart/form-data';
}
else
{
form.enctype = 'multipart/form-data';
}
$(form).submit();
} catch(e)
{
jQuery.handleError(s, xml, null, e);
}
if(window.attachEvent){
document.getElementById(frameId).attachEvent('onload', uploadCallback);
}
else{
document.getElementById(frameId).addEventListener('load', uploadCallback, false);
}
return {abort: function () {}};
},
uploadHttpData: function( r, type ) {
var data = !type;
data = type == "xml" || data ? r.responseXML : r.responseText;
// If the type is "script", eval it in global context
if ( type == "script" )
jQuery.globalEval( data );
// Get the JavaScript object, if JSON is used.
if ( type == "json" ){
// 因為json資料會被<pre>標籤包著，所以有問題，現在新增以下程式碼，
// update by hzy
var reg = /<pre.+?>(.+)<\/pre>/g;
var result = data.match(reg);
result = RegExp.$1;
// update end
data = $.parseJSON(result);
// eval( "data = " + data );
}
// evaluate scripts within html
if ( type == "html" )
jQuery("<div>").html(data).evalScripts();
//alert($('param', data).each(function(){alert($(this).attr('value'));}));
return data;
}
})
Controller部分