html代碼片段:

<form action='#' id='uploadForm'><div class='layui-form-item'><label class='layui-form-label'>名稱</label><div class='layui-input-block'><input type='text' placeholder='請輸入配置名稱' autocomplete='off'class='layui-input'></div></div><div class='layui-form-item layui-form-text'><label class='layui-form-label'>描述</label><div class='layui-input-block'><textarea placeholder='請輸入配置描述' class='layui-textarea'></textarea></div></div><div class='layui-form-item'><label class='layui-form-label'>文件</label><div class='layui-input-block'><input type='file' name='file'><p class='help-block'>請選擇配置文件</p></div></div><div class='layui-form-item'><div class='layui-input-block'><button id='save_config_file'>立即提交</button><button type='reset' class='layui-btn layui-btn-primary'>重置</button></div></div></form>

js代碼片段:

//上傳配置文件$('#save_config_file').click(function () {var name = $('#config_name').val();var desc = $('#config_desc').val();var userId = $('#userId').val();var formData = new FormData($('#uploadForm')[0]);formData.append('name',name);formData.append('desc',desc);formData.append('userId',userId);$.ajax({url: ’http://localhost:8090/bfi-web/api/ide/settings/uploadFiles’,type: ’POST’,data: formData,async: false,cache: false,contentType: false,processData: false,success: function (returndata) {layui.use(’layer’, function () {var layer = layui.layer;layer.msg(returndata.returnMsg, {icon: 1});});setTimeout(() => {closeLayui();}, 300);},error: function (returndata) {console.log('====================Error==========================');}});});

Java代碼片段(這里是SpringMVC+騰訊云對象存儲,可將其更換為其它對象存儲，如七牛云、ftp或者是其它對象存儲):

/** * 上傳文件 * @param request * @param file * @return */@PostMapping(value='/uploadFiles',produces='application/json;charset=utf-8')public JSONObject upModify(HttpServletRequest request, MultipartFile file) {JSONObject json = new JSONObject();try {COSClientUtil cosClientUtil = new COSClientUtil(); if(!file.isEmpty()) {String name = cosClientUtil.uploadFile2Cos(file);String desc = request.getParameter('desc'); String names = request.getParameter('name'); String userId = request.getParameter('userId'); logger.info('desc:'+desc); logger.info('names:'+names); logger.info('userId:'+userId); //圖片名稱logger.info('name = ' + name);//上傳到騰訊云String imgUrl = cosClientUtil.getImgUrl(name); logger.info('imgUrl = ' + imgUrl);//數據庫保存圖片地址String dbImgUrl = imgUrl.substring(0,imgUrl.indexOf('?'));logger.info('dbImgUrl = ' + dbImgUrl);IdeSettings ide = new IdeSettings();ide.setName(names);ide.setContent(dbImgUrl);ide.setUserId(userId);ide.setUpdateTime(DateUtil.date().toString());ide.setUploadTime(DateUtil.date().toString());ide.setDescription(desc);boolean isAddConfig = ideSettingsService.insert(ide);logger.info(isAddConfig);if(isAddConfig) {json.put(CommonEnum.RETURN_CODE, '000000');json.put(CommonEnum.RETURN_MSG, '上傳成功');}else {json.put(CommonEnum.RETURN_CODE, '222222');json.put(CommonEnum.RETURN_MSG, '上傳失敗');}}else {json.put(CommonEnum.RETURN_CODE, '111111');json.put(CommonEnum.RETURN_MSG, '參數異常');}} catch (Exception e) {e.printStackTrace();json.put(CommonEnum.RETURN_CODE, '333333');json.put(CommonEnum.RETURN_MSG, '特殊異常');} return json;}另一種示例：

1.jsp

$('#cxsc').click(function(){var bankId = $('#bankId').val();var formdata = new FormData();formdata.append(’logo’, $(’#btnFile’).get(0).files[0]);formdata.append(’bankId’, bankId);$.ajax({ type: ’POST’, url: ’./uploadLogo’, contentType : false, data : formdata, processData : false, dataType: 'json', success: function (data) {$('#logoImg').attr(’src’,’${_b}/upload/banklogo/’+data.msg); }, error : function(data) {alert(’上傳失??！’); }}); <#if formData?exists> <#if (formData.logoImg??)><img src='http://www.hdgsjgj.cn/bcjs/${_b}/upload/banklogo/${formData.logoImg}' /><br/><input type='file' name='logo' style='border:none;display:inline'><button type='button' style='display:inline'>上傳</button> <#else><input type='file' name='logo' style='border:none'> </#if><#else> <input type='file' name='logo' style='border:none'></#if>

2.controller

@RequestMapping(value = '/uploadLogo', method = {RequestMethod.POST}) public void uploadLogo(@RequestParam(value = 'bankId', required = true) String bankId,@RequestParam('logo') MultipartFile logo,HttpServletRequest request, HttpServletResponse response, ModelMap model) {Json json = new Json();BankManage bankManage = bankManageService.getById(bankId);if (bankManage != null) { try {if (!logo.isEmpty()) { String relativePath = '/upload/banklogo'; // 舊圖片路徑 String absolutePath = request.getSession().getServletContext().getRealPath(relativePath)+''+bankManage.getLogoImg(); File oldfile = new File(absolutePath); if (oldfile.exists()) {oldfile.delete(); // 刪除舊圖片 } String newPath = request.getSession().getServletContext().getRealPath(relativePath)+''+logo.getOriginalFilename(); File newFile = new File(newPath); logo.transferTo(newFile); bankManage.setLogoImg(logo.getOriginalFilename()); bankManageService.update(bankManage); json.setMsg(logo.getOriginalFilename()); writeJson(request, response, json);}else { json.setMsg('上傳失敗！'); writeJson(request, response, json);} }catch (Exception e) {e.printStackTrace();logger.error(e); }} }

以上就是Java使用Ajax異步上傳文件的詳細內容，更多關于Java 用Ajax上傳文件的資料請關注好吧啦網其它相關文章！