如何在angular2中正确使用http服务？

npm install @angular/http

import { Http, Response } from '@angular/http';
import { Observable } from 'rxjs/Observable';
import 'rxjs/add/operator/map';
import 'rxjs/add/operator/catch';

constructor(private http: Http) { }

getData(): Observable<any> {
  return this.http.get('https://api.example.com/data')
    .map((response: Response) => response.json())
    .catch((error: any) => Observable.throw(error.json().error || 'Server error'));
}

this.getData().subscribe(
  data => {
    // 处理返回的数据
  },
  error => {
    // 处理错误
  }
);