AngularJS上传文件的示例代码
编程学习 2021-07-04 16:47www.dzhlxh.cn编程入门
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，长沙网络推广觉得挺不错的，现在分享给大家，也给大家做个参考。一起跟随长沙网络推广过来看看吧
使用AngularJS上传文件
- 前台是Angular页面
- 后台使用SpringBoot/SpirngMVC
上传文件
html
<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狼蚁SEO。