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。