如何使用angular2 Observable

有人能帮助我如何使用Observable on http请求来处理成功、失败和拒绝案例吗？

创建服务：

import { Injectable } from '@angular/core';
import { Http, Response, Headers } from '@angular/http';
import { Observable } from 'rxjs/Observable';
import 'rxjs/Rx';

@Injectable()
export class MyService {
     constructor(private _http: Http) {
     }

     private handleError(error: Response) {
        console.error(error);
        return Observable.throw(error.json().error || "Server error");
     }

     getMethod(): Observable<any> {
        return this._http.get("yourGetUrl")
           .map((response: any) => <any>response.json())
           .catch(this.handleError);
     }

}

---

代码如下所示：

在用

import 'rxjs/Rx';
import 'rxjs/add/operator/map';
import 'rxjs/add/operator/catch';

public getData(): Observable<Type> {
  return this.http.get(request)
   .map(res:ResponseType => res.json()) //Success
   .catch(err => console.log(err)); //failure
}

---

这个题目和这个问题有什么关系？

import 'rxjs/Rx';
import 'rxjs/add/operator/map';
import 'rxjs/add/operator/catch';

public getData(): Observable<Type> {
  return this.http.get(request)
   .map(res:ResponseType => res.json()) //Success
   .catch(err => console.log(err)); //failure
}

getData().subscribe(
    data => console.log(data),
    error => console.log(error) //reject
);