http://localhost:4200/assets/product.json 404（未找到）

Question

我正在尝试通过服务读取json文件数据。我已在名为product.json的资产文件夹中创建了该文件。 但运行代码时，它会在控制台中返回“http://localhost:4200/assets/product.json 404（未找到）”。

这是我的服务文件代码：

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

@Injectable()
export class ProductDataService {
    headers:Headers;
    options:RequestOptions;
//url:string="/localservice/product.json";
url:string = "assets/product.json"
  constructor(private _http:Http) { 
      this.headers = new Headers({'Content-type':'application/json','Accept':'q=0.8;application/json;q=0.9'});
      this.options  =new RequestOptions({headers:this.headers})
  }


  getAllProduct(){
    return this._http.get('../assets/product.json',this.options)
    .map((res:Response)=>res.json());
  }
}

我尝试使用“assets/product.json”、“../assets/product.json”作为路径

产品.组件.ts：

export class ProductComponent {

    allProduct:Product[]=[];
    constructor(private _data:ProductDataService) { }
    ngOnInit() {
      /* this._data.getAllProduct().subscribe(
        (data:Product[])=>{
          this.allProduct=data;
        }
      ); */
    }
    onClick(value:string){
  if(value!=''){
  this.allProduct=this.allProduct.filter(res=>res.pname.startsWith(value));
  }
  else{
    this._data.getAllProduct().subscribe(
        (data:Product[])=>{
          this.allProduct=data;
        }
      );
    }
  }

}

角度-cli.json：

{
  "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
  "project": {
    "name": "new-app"
  },
  "apps": [
    {
      "root": "src",
      "outDir": "dist",
      "assets": [
        "assets",
        "favicon.ico"
      ],
      "index": "index.html",
      "main": "main.ts",
      "polyfills": "polyfills.ts",
      "test": "test.ts",
      "tsconfig": "tsconfig.app.json",
      "testTsconfig": "tsconfig.spec.json",
      "prefix": "app",
      "styles": [
        "styles.css"
      ],
      "scripts": [],
      "environmentSource": "environments/environment.ts",
      "environments": {
        "dev": "environments/environment.ts",
        "prod": "environments/environment.prod.ts"
      }
    }
  ],
  "e2e": {
    "protractor": {
      "config": "./protractor.conf.js"
    }
  },
  "lint": [
    {
      "project": "src/tsconfig.app.json",
      "exclude": "**/node_modules/**"
    },
    {
      "project": "src/tsconfig.spec.json",
      "exclude": "**/node_modules/**"
    },
    {
      "project": "e2e/tsconfig.e2e.json",
      "exclude": "**/node_modules/**"
    }
  ],
  "test": {
    "karma": {
      "config": "./karma.conf.js"
    }
  },
  "defaults": {
    "styleExt": "css",
    "component": {}
  }
}

请告诉我问题出在哪里。提前谢谢

Answer 1

尝试这样：

使用类似

this._http.get('assets/product.json',this.options)

的路径而不是

this._http.get('../assets/product.json',this.options)

getAllProduct() {
    return this._http.get('assets/product.json', this.options)
        .map((res: Response) => res.json());
}

Answer 2

尝试如下代码

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

@Injectable()
export class ProductDataService {
private data: any;

 constructor(private http: Http) { }

 getData(){
   this.http.get('assets/data/products.json')
   .map((res) => res.json())
   .subscribe(data => {
      this.data = data;
   }, (rej) => {
          console.error("Could not load local data",rej)
   });
 }
} 

将

../assets/data/products.json

更改为

assets/data/products.json