angularjs http与后台交互的实现示例

import { NgModule, ErrorHandler } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { IonicApp, IonicModule, IonicErrorHandler } from 'ionic-angular';
import { MyApp } from './app.ponent';


import { LoginPage } from "../pages/login/login";
/
引入HttpClientModule模块
/
import { HttpClientModule } from "@angular/mon/http";

import { RequestServiceProvider } from "../providers/request-service/request-service";
import { StatusBar } from '@ionic-native/status-bar';
import { SplashScreen } from '@ionic-native/splash-screen';

@NgModule({
 declarations: [
  MyApp,
  
  LoginPage,
  
 ],
 imports: [
  BrowserModule,
   /
   导入模块
   /
  HttpClientModule,
  
  IonicModule.forRoot(MyApp,{
   tabsHideOnSubPages:'true',
   backButtonText:''
  })
 ],
 bootstrap: [IonicApp],
 entryComponents: [
  MyApp,
  
  LoginPage,
  
 ],
 providers: [
  StatusBar,
  SplashScreen,
  {provide: ErrorHandler, useClass: IonicErrorHandler},
  RequestServiceProvider,
  
 ]
})
export class AppModule {}

ionic g provider RequestService

/
导入http相关
/
import { HttpClient,HttpHeaders } from '@angular/mon/http';
import { Injectable } from '@angular/core';
import {Observable} from "rxjs";

/
 Generated class for the RequestServiceProvider provider.

 See https://angular.io/guide/dependency-injection for more info on providers
 and Angular DI.
/
@Injectable()
export class RequestServiceProvider {

  /
  讲基础路径提取说出来，配置ip和端口时只需要在这修改
  /
 //basePath:string='http://10.4.0.205:8081'
 reserveBasePath:string='http://10.6.254.110:8081'
 basePath=this.reserveBasePath;
  /
  封装固定的消息头相关
  /
 private headers = new HttpHeaders({'Content-Type': 'application/json'})
 // private headers = new HttpHeaders({'Aess-Control-Allow-Origin':''});

/
初始化http变量
/
 constructor(public http: HttpClient) {
  console.log('Hello RequestServiceProvider Provider');
 }

  /
  给外界提供了四个基础的方法只需要传入uri和data即可
  /
 get(req:any):Observable<any> {
  return this.http.get(this.basePath+req.uri,{headers:this.headers});
 }

 post(req:any):Observable<any>{
  return this.http.post(this.basePath+req.uri,req.data,{headers:this.headers});
 }
 put(req:any):Observable<any>{
  return this.http.put(this.basePath+req.uri,req.data,{headers:this.headers});
 }
 delete(req:any):Observable<any>{
  return this.http.delete(this.basePath+req.uri,{headers:this.headers});
 }

}

import { NgModule, ErrorHandler } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { IonicApp, IonicModule, IonicErrorHandler } from 'ionic-angular';
import { MyApp } from './app.ponent';


import { LoginPage } from "../pages/login/login";
/
引入HttpClientModule模块
/
import { HttpClientModule } from "@angular/mon/http";

/
导入自定的服务
/
import { RequestServiceProvider } from "../providers/request-service/request-service";
import { StatusBar } from '@ionic-native/status-bar';
import { SplashScreen } from '@ionic-native/splash-screen';

@NgModule({
 declarations: [
  MyApp,
  
  LoginPage,
  
 ],
 imports: [
  BrowserModule,
   /
   导入模块
   /
  HttpClientModule,
  
  IonicModule.forRoot(MyApp,{
   tabsHideOnSubPages:'true',
   backButtonText:''
  })
 ],
 bootstrap: [IonicApp],
 entryComponents: [
  MyApp,
  
  LoginPage,
  
 ],
 providers: [
  StatusBar,
  SplashScreen,
  {provide: ErrorHandler, useClass: IonicErrorHandler},
  /
  声明服务
  /
  RequestServiceProvider,
  
 ]
})
export class AppModule {}

import { Component } from '@angular/core';
import { IonicPage, NavController, NavParams } from 'ionic-angular';
/
导入声明
/
import {RequestServiceProvider} from "../../providers/request-service/request-service";

/
  Generated class for the LoginPage page.
 
  See https://ionicframework./docs/ponents/#navigation for more info on
  Ionic pages and navigation.
 /

@IonicPage()
@Component({
 selector: 'page-login',
 templateUrl: 'login.html',
})
export class LoginPage {
 title:string = '登录'
 promptMessage:string = ''

 user={
  username:'',
  password:''
 }
 req={
  login:{
   uri:'/user/login'
  }

 }

 constructor(public navCtrl: NavController, public navParams: NavParams,
        /
        初始化服务对象
        /
       private requestService:RequestServiceProvider) {

 }
 
 ionViewDidLoad() {
  console.log('ionViewDidLoad LoginPage');
 }
 login(){
 
   /
   调用post方法，subscribe()方法可以出发请求，调用一次发送一次，调用多次发多次
   /
  this.requestService.post({uri:this.req.login.uri,data:user}).subscribe((res:any)=>{
   console.log(res);
   if (res.code == 0){
    this.promptMessage = res.message;
   } else {   
    this.promptMessage = res.message;
   }

  },
   error1 => {
   alert(JSON.stringify(error1))
   });

 }
}