import { Injectable } from '@angular/core'; import { Http, Headers, RequestOptions, Response } from

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定义一个Angular2/4 service:

import { Injectable } from '@angular/core';import { Http, Headers, RequestOptions, Response } from '@angular/http'; import { User } from '../_models/index'; @Injectable()export class UserService {    constructor(private http: Http) { }     getAll() {        return this.http.get('/api/users', this.jwt()).map((response: Response) => response.json());    }     getById(id: number) {        return this.http.get('/api/users/' + id, this.jwt()).map((response: Response) => response.json());    }     create(user: User) {        return this.http.post('/api/users', user, this.jwt()).map((response: Response) => response.json());    }     update(user: User) {        return this.http.put('/api/users/' + user.id, user, this.jwt()).map((response: Response) => response.json());    }     delete(id: number) {        return this.http.delete('/api/users/' + id, this.jwt()).map((response: Response) => response.json());    }     // private helper methods     private jwt() {        // create authorization header with jwt token        let currentUser = JSON.parse(localStorage.getItem('currentUser'));        if (currentUser && currentUser.token) {            let headers = new Headers({ 'Authorization': 'Bearer ' + currentUser.token });            return new RequestOptions({ headers: headers });        }    }}