使用AngularJS上传文件
前台是Angular页面
后台使用SpringBoot/SpirngMVC
上传文件
html
<div> <input type="file" /> <button ng-click="uploadFile()">上传</button> </div>
js
$scope.upload = function(){ var form = new FormData(); var file = document.getElementById("fileUpload").files[0]; form.append('file', file); $http({ method: 'POST', url: '/upload', data: form, headers: {'Content-Type': undefined}, transformRequest: angular.identity }).success(function (data) { console.log('upload success'); }).error(function (data) { console.log('upload fail'); }) }
注意：
AngularJS默认的'Content-Type'是application/json ，通过设置'Content-Type': undefined，这样浏览器不仅帮我们把Content-Type 设置为 multipart/form-data，还填充上当前的boundary，
如果手动设置为：'Content-Type': multipart/form-data，后台会抛出异常：the request was rejected because no multipart boundary was found
boundary 是随机生成的字符串，用来分隔文本的开始和结束
通过设置 transformRequest: angular.identity ，anjularjs transformRequest function 将序列化我们的formdata object，也可以不添加
后台
@RequestMapping("/upload") public void uploadFile(@RequestParam(value = "file" , required = true) MultipartFile file) { //deal with file }
注意
文件必须通过@RequestParam注解来获取，且需指定value才能获取到
这样就完成了上传文件
上传文件的同时传递其他参数
html
<div> <input type="file" /> <button ng-click="ok()">上传</button><br> <input ng-model="user.username" /> <input ng-model="user.password" /> </div>
js
$scope.ok = function () { var form = new FormData(); var file = document.getElementById("fileUpload").files[0]; var user =JSON.stringify($scope.user); form.append('file', file); form.append('user',user); $http({ method: 'POST', url: '/addUser', data: form, headers: {'Content-Type': undefined}, transformRequest: angular.identity }).success(function (data) { console.log('operation success'); }).error(function (data) { console.log('operation fail'); }) };
注意
需要将Object转为String后在附加到form上，否则会直接被转为字符串[Object,object]
后台
@RequestMapping("/upload") public Map<String, Object> upload(@RequestParam(value = "file") MultipartFile file, @RequestParam(value = "user", required = true) String user) { try (FileInputStream in = (FileInputStream) headImg.getInputStream(); FileOutputStream out = new FileOutputStream("filePathAndName")) { //将Json对象解析为UserModel对象 ObjectMapper objectMapper = new ObjectMapper(); UserModel userModel = objectMapper.readValue(user, UserModel.class); //保存文件到filePathAndName int hasRead = 0; byte[] bytes = new byte[1024]; while ((hasRead = in.read(bytes)) > 0) { out.write(bytes, 0, hasRead); } } catch (IOException e) { e.printStackTrace(); } }
注意
ObjectMapper为com.fasterxml.jackson.databind.ObjectMapper