ionic3+Angular4实现接口请求及本地json文件读取示例

[
 {
  "id":"1",
  "name":"xiehan",
  "age":"24",
  "message":"测试json文件读取"
 },
 {
  "id":"2",
  "name":"xiehan",
  "age":"24",
  "message":"测试json文件读取"
 },
 {
  "id":"3",
  "name":"xiehan",
  "age":"24",
  "message":"测试json文件读取"
 },
 {
  "id":"4",
  "name":"xiehan",
  "age":"24",
  "message":"测试json文件读取"
 }
]

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


@Injectable()
export class DemoService {

 constructor(private httpService: Http){
 }
 // 网络接口请求
 getHomeInfo(): Observable<Response> {
  return this.httpService.request('http://jsonplaceholder.typicode.com/users')
 }

 // 本地json文件请求
 getRequestContact(){
  return this.httpService.get("assets/json/message.json")
 }
}

//home.ts
import {ChangeDetectorRef, Component} from '@angular/core';
import { NavController } from 'ionic-angular';
import {DemoService} from "../../services/demo.service";

@Component({
 selector: 'page-home',
 templateUrl: 'home.html'
})
export class HomePage {
 // 接收数据用
 listData: Object;
 // 依赖注入
 constructor(public navCtrl: NavController,
       private ref: ChangeDetectorRef,
       private demoService: DemoService,) {
 }

 ionViewDidLoad() {
  // 网络请求
  this.getHomeInfo();
 }

 getHomeInfo(){
  this.demoService.getHomeInfo()
   .subscribe(res => {
    this.listData = res.json();
    // 数据格式请看log
    console.log("listData------->",this.listData);
    this.ref.detectChanges();
   }, error => {
    console.log(error);
   });
 }
}

 
//home.html
<ion-header>
 <ion-navbar>
  <ion-title>首页</ion-title>
 </ion-navbar>
</ion-header>

<ion-content padding>
 <ion-list *ngFor="let item of listData">
  <ion-item>
  <!--?是Angular特定语法，相当于判断数据是否存在，有则显示无则不显示-->
   {{item?.name}}
  </ion-item>
 </ion-list>
</ion-content>

//contact.ts
import {ChangeDetectorRef, Component} from '@angular/core';
import { NavController } from 'ionic-angular';
import {DemoService} from "../../services/demo.service";

@Component({
 selector: 'page-contact',
 templateUrl: 'contact.html'
})
export class ContactPage {

 contactInfo=[];

 constructor(public navCtrl: NavController,
       private demoService: DemoService,
       private ref: ChangeDetectorRef,) {

 }

 ionViewDidLoad() {
  // 网络请求
  this.getRequestContact();
 }

 getRequestContact(){
  this.demoService.getRequestContact()
   .subscribe(res => {
    this.contactInfo = res.json();
    console.log("contactInfo------->",this.contactInfo);
    this.ref.detectChanges();
   }, error => {
    console.log(error);
   });
 }
}

// contact.html
<ion-header>
 <ion-navbar>
  <ion-title>
   联系人
  </ion-title>
 </ion-navbar>
</ion-header>

<ion-content>
 <ion-list>
  <ion-item *ngFor="let item of contactInfo">
   <div style="display: flex;flex-direction: column;">
    <span>姓名:{{item?.name}}</span>
    <span>年龄:{{item?.age}}</span>
    <span>信息:{{item?.message}}</span>
   </div>
  </ion-item>
 </ion-list>
</ion-content>