问后台的Angular2 rest调用

EN

import { Injectable } from '@angular/core';
import { Http, Response , Headers} from '@angular/http';
import 'rxjs/add/operator/toPromise';
import { Hero } from './hero';
import { Code } from './code';
import { HEROES } from './mock-heroes';

@Injectable()
export class HeroService {
    constructor(private http: Http) { }
           private heroesUrl = 'http://localhost:8081//Myserver/rest/heros';  // URL to web api


    getHeroes() {
        return this.http.get(this.heroesUrl)
            .toPromise()
            .then(
            response => response.json() as Hero[])
            .catch(this.handleError);
    }
    getHero(id: number) {
        return this.getHeroes()
            .then(heroes => heroes.find(hero => hero.id === id));
    }

    private handleError(error: any) {
        console.error('An error occurred', error);
        return Promise.reject(error.message || error);
    }
}