Angular 5中RequestOptions不推荐使用的符号错误

Question

我正在尝试使Angular 4中的代码适应Angular5。我进行了很多更改，但是关于出现错误RequestOptions。该代码是关于身份验证的，这是我出现错误的地方：

  import { Injectable } from '@angular/core';
   import { RequestOptions} from '@angular/http';
   import {User} from '../model/model.user';
   import 'rxjs/add/operator/map';
    import {HttpClient, HttpHeaders} from '@angular/common/http';

  @Injectable()
  export class AuthService {
  constructor(public http: HttpClient) { }

    public logIn(user: User) {

const headers = new HttpHeaders();
headers.append('Accept', 'application/json')
// creating base64 encoded String from user name and password
const base64Credential: string = btoa( user.username + ':' + user.password);
headers.append('Authorization', 'Basic ' + base64Credential);
     // this is where i'm having a problem : 
      const httpOptions = new RequestOptions();
      httpOptions.headers = headers;

    return this.http.get('http://localhost:8081/' + '/account/login' ,   
   httpOptions)
  .map(resp => {
    // login successful if there's a jwt token in the response
    const user = resp.json().principal; // the returned user object is a principal object
    if (user) {
      // store user details  in local storage to keep user logged in between page refreshes
      localStorage.setItem('currentUser', JSON.stringify(user));
    }
  });
     }


    logOut() {
// remove user from local storage to log user out
return this.http.post('http://localhost:8081/' + 'logout', {} )
  .map(resp => {
    localStorage.removeItem('currentUser');
  });

      }
      }

错误：使用了不赞成使用的符号，请帮助我更改Angular 5（RequestOptions）中的代码

Answer 1

您不应该RequestOptions在已弃用的模块中使用@angular/http。

如API文档中所述options，现在具有以下类型：

{
    headers?: HttpHeaders | {
        [header: string]: string | string[];
    };
    observe?: HttpObserve;
    params?: HttpParams | {
        [param: string]: string | string[];
    };
    reportProgress?: boolean;
    responseType?: 'arraybuffer' | 'blob' | 'json' | 'text';
    withCredentials?: boolean;
}

因此，您应该写：

const headers = new HttpHeaders();
headers.append('Accept', 'application/json')
const base64Credential: string = btoa( user.username + ':' + user.password);
headers.append('Authorization', 'Basic ' + base64Credential);

this.http.get('http://localhost:8081/' + '/account/login', {
  headers: headers
});

或者：

this.http.get('http://localhost:8081/' + '/account/login', {
  headers: {
    'Accept': 'application/json',
    'Authorization': 'Basic ' + btoa(user.username + ':' + user.password)
  }
});