AngularJS上傳文件的示例代碼

更新時(shí)間：2018年11月10日 15:45:39 作者：?jiǎn)鑶鑶枥怖怖?

上傳文件在很多時(shí)候都能用到，這篇文章主要介紹了AngularJS上傳文件的示例代碼，小編覺(jué)得挺不錯(cuò)的，現(xiàn)在分享給大家，也給大家做個(gè)參考。一起跟隨小編過(guò)來(lái)看看吧

使用AngularJS上傳文件

前臺(tái)是Angular頁(yè)面
后臺(tái)使用SpringBoot/SpirngMVC

上傳文件

html

<div>
  <input id="fileUpload" type="file" />
  <button ng-click="uploadFile()">上傳</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默認(rèn)的'Content-Type'是application/json ，通過(guò)設(shè)置'Content-Type': undefined，這樣瀏覽器不僅幫我們把Content-Type 設(shè)置為 multipart/form-data，還填充上當(dāng)前的boundary，
如果手動(dòng)設(shè)置為：'Content-Type': multipart/form-data，后臺(tái)會(huì)拋出異常：the request was rejected because no multipart boundary was found
boundary 是隨機(jī)生成的字符串，用來(lái)分隔文本的開(kāi)始和結(jié)束
通過(guò)設(shè)置 transformRequest: angular.identity ，anjularjs transformRequest function 將序列化我們的formdata object，也可以不添加

后臺(tái)

  @RequestMapping("/upload")
  public void uploadFile(@RequestParam(value = "file" , required = true) MultipartFile file) {
    //deal with file
  }

注意

文件必須通過(guò)@RequestParam注解來(lái)獲取，且需指定value才能獲取到

這樣就完成了上傳文件

上傳文件的同時(shí)傳遞其他參數(shù)

html

  <div>
    <input id="fileUpload" type="file" />
    <button ng-click="ok()">上傳</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

需要將Object轉(zhuǎn)為String后在附加到form上，否則會(huì)直接被轉(zhuǎn)為字符串[Object,object]

后臺(tái)

  @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")) {

      //將Json對(duì)象解析為UserModel對(duì)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為com.fasterxml.jackson.databind.ObjectMapper

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