AngularJS上传文件的示例代码

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 id="fileUpload" 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 id="fileUpload" 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

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。