上传文件在很多时候都能用到,这篇文章主要介绍了AngularJS上传文件的示例代码,小编觉得挺不错的,现在分享给大家,也给大家做个参考。一起跟随小编过来看看吧
使用AngularJS上传文件
- 前台是Angular页面
- 后台使用SpringBoot/SpirngMVC
上传文件
html
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
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 Mapupload(@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
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