javascript - 如何使用 Angular 将 JSON 和文件发布到 Web 服务？

Question

如何使用 AngularJS 发送 POST 请求？ JSON 部分是必需的，但文件不是。我已经根据其他博客文章尝试过此操作，但它不起作用。我收到一个错误请求 400 错误。

答对加200分

var test = {
  description:"Test",
  status: "REJECTED"
};

var fd = new FormData();
fd.append('data', angular.toJson(test));

return $http.post('/servers', fd, {
  transformRequest: angular.identity,
  headers: {
    'Content-Type': undefined
  }
});

Answer 1

我已经用一个简单的 Spring 后端测试了您的代码，它运行良好:

@Controller
public class FileController {

  @ResponseBody
  @RequestMapping(value = "/data/fileupload", method = RequestMethod.POST)
  public String postFile(@RequestParam(value="file", required=false) MultipartFile file,
                       @RequestParam(value="data") Object data) throws Exception {
    System.out.println("data = " + data);

    return "OK!";
  }
}

我已将您的客户端代码与 Angular v1.1.5 一起使用:

var test = {
  description:"Test",
  status: "REJECTED"
};

var fd = new FormData();
fd.append('data', angular.toJson(test));

//remove comment to append a file to the request
//var oBlob = new Blob(['test'], { type: "text/plain"});
//fd.append("file", oBlob,'test.txt');

return $http.post('/data/fileupload', fd, {
  transformRequest: angular.identity,
  headers: {
    'Content-Type': undefined
  }
});

请求看起来像这样(从 Chrome 控制台网络选项卡复制):

Request URL:http://localhost:8080/data/fileupload
Request Method:POST
Status Code:200 OK

Request Headers
POST /data/fileupload HTTP/1.1
Host: localhost:8080
...
Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryEGiRWBFzWY6xwelb
Referer: http://localhost:8080/
...
Request Payload
------WebKitFormBoundaryEGiRWBFzWY6xwelb
Content-Disposition: form-data; name="data"

{"description":"Test","status":"REJECTED"}
------WebKitFormBoundaryEGiRWBFzWY6xwelb--

响应 200 OK，控制台输出预期的:{"description":"Test","status":"REJECTED"}