共计 4200 个字符，预计需要花费 11 分钟才能阅读完成。
1. 描述
无论是使用 angularjs 做前端或是结合 ionic 混合开发移动端开发 app 都需要与后台进行交互，而 angular 给我提供了 httpModule 模块供我们使用。今天就展现一个 http 的封装和使用的一个具体流程。
2. HttpModule 引入
找到 app.module.ts 文件
import {NgModule, ErrorHandler} from ‘@angular/core’;
import {BrowserModule} from ‘@angular/platform-browser’;
import {IonicApp, IonicModule, IonicErrorHandler} from ‘ionic-angular’;
import {MyApp} from ‘./app.component’;
import {LoginPage} from “../pages/login/login”;
/**
引入 HttpClientModule 模块
*/
import {HttpClientModule} from “@angular/common/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 {}
按照自己的项目导入 HttpClientModule 模块即可，我导入其他组件，不用考虑。
3. 创建服务
ionic g provider RequestService
执行完成后则会出现如下文件
4. 封装服务
/**
导入 http 相关
*/
import {HttpClient,HttpHeaders} from ‘@angular/common/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({‘Access-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});
}
}
5. 导入声明封装服务
找到 app.module.ts 文件和第一部类似
import {NgModule, ErrorHandler} from ‘@angular/core’;
import {BrowserModule} from ‘@angular/platform-browser’;
import {IonicApp, IonicModule, IonicErrorHandler} from ‘ionic-angular’;
import {MyApp} from ‘./app.component’;
import {LoginPage} from “../pages/login/login”;
/**
引入 HttpClientModule 模块
*/
import {HttpClientModule} from “@angular/common/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 {}
6. 使用服务
找到自己的页面所对应的 ts 文件如下面代码一样
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.com/docs/components/#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))
});
}
}
