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AngularJS上传文件的示例代码

2018-11-10 15:45 836 查看

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。

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