问Post和Put在Angular2中

EN

POST http://localhost:3002/app/components/bookdata/dbooks.json 404 (Not 
Found)



import {Injectable} from '@angular/core';
import {Http,Response} from '@angular/http';
import {Headers} from '@angular/http';
import 'rxjs/add/operator/map';
import {RequestOptions} from  '@angular/http';

@Injectable()
export class BookService  {
public _url:string="app/components/bookdata/dbooks.json";

constructor(private _http:Http){}
getBooks(){

    return this._http.get(this._url)
    .map((res:Response)=>res.json());
}

insertNewBook(book:Book){



            let body=JSON.stringify(book);
            let headers=new Headers({'Content-Type':'application/json'});
            let options=new RequestOptions({headers:headers});
            this._http.post(this._url,body).subscribe();


       //  .map((res:Response)=>res.json());


    }
        }




export interface Book{
id:number;
Author:string;
Date:string;
Title:string;
}

 import{Component,OnInit} from '@angular/core';
 import {Book} from '../services/book.service'
 import {Injectable} from '@angular/core';
 import {Http,Response} from '@angular/http';
 import {BookService} from '../services/book.service';
 import 'rxjs/add/operator/map';

 @Component({
 selector:'newBook',
 template:`
            <div>

            <div>
                <label for="Author">Author:</label>
                <input type="text" id="au" #au>
        </div>

        <div>
        </div>
        <div>

        <label for="Date">Date:</label>
        <input type="text" id="da" #da>
</div>

<div>
<label for="Titl">Title:</label>
<input type="text" id="ti" #ti>
</div>
<button (click)="InsertData(au.value,da.value,ti.value)">Create</button>
</div>

 })
export class NewBookComponent  {
 book:Book;
static num:number;

constructor(private _bookService:BookService){
    NewBookComponent.num=10;
}

InsertData(au:string,da:string,ti:string){

   let book:Book={id:NewBookComponent.num++,Author:au,Date:da,Title:ti};


                 this._bookService.insertNewBook(this.book);
             //.subscribe(res=>console.log(res));


}

}