Angular EXCEPTION:没有Http的提供程序

我得到的例外:没有提供Http!我做错了什么?

import {Http, Headers} from 'angular2/http';
import {Injectable} from 'angular2/core'


@Component({
    selector: 'greetings-ac-app2',
    providers: [],
    templateUrl: 'app/greetings-ac2.html',
    directives: [NgFor, NgModel, NgIf, FORM_DIRECTIVES],
    pipes: []
})
export class GreetingsAcApp2 {
    private str:any;

    constructor(http: Http) {

        this.str = {str:'test'};

        http.post('http://localhost:18937/account/registeruiduser/',
            JSON.stringify(this.str),
            {
                headers: new Headers({
                    'Content-Type': 'application/json'
                })
            });

当前回答

在使用它之前，将HttpModule添加到app.module.ts文件中的imports数组中。

从@angular/http导入{HttpModule}; @NgModule ({ 声明:[ AppComponent, CarsComponent ]，进口:[ BrowserModule, step 4 ]，供应商:[], 引导(AppComponent): }) 导出类AppModule {}

2017-08-19 13:37:25

其他回答

因为只是在评论区，我重复了Eric的回答:

我必须包含HTTP_PROVIDERS

2015-11-27 11:21:46

导入HttpModule

import { HttpModule } from '@angular/http';

@NgModule({
    imports: [ BrowserModule, HttpModule ],
    providers: [],
    declarations: [ AppComponent ],
    bootstrap: [ AppComponent ]
})
export default class AppModule { }

platformBrowserDynamic().bootstrapModule(AppModule);

理想情况下，您可以将这些代码拆分到两个单独的文件中。欲了解更多信息，请阅读:

https://v2.angular.io/docs/ts/latest/cookbook/rc4-to-rc5.html https://v2.angular.io/docs/ts/latest/guide/ngmodule.html

2016-01-03 14:09:21

**

简单的方法:在app.module.ts中导入HttpModule和HttpClientModule

import { HttpClientModule } from '@angular/common/http';
import { HttpModule } from '@angular/http';



@NgModule({
 declarations: [
   AppComponent, videoComponent, tagDirective, 
 ],
 imports: [
  BrowserModule, routing, HttpClientModule, HttpModule

],
providers: [ApiServices],
bootstrap: [AppComponent]
})
export class AppModule { }

2018-01-25 10:57:43

你所需要做的就是在tour app.module.ts中包含以下库，并将其包含在你的导入中:

import { HttpModule } from '@angular/http';

@NgModule({
  imports:    [ HttpModule ],
  declarations: [ AppComponent ],
  bootstrap:    [ AppComponent ]
})
export class AppModule { }

2017-12-11 09:58:29

只需包含以下库:

import { HttpModule } from '@angular/http';
import { YourHttpTestService } from '../services/httpTestService';

并在providers部分中包含HTTP类，如下所示:

@Component({
  selector: '...',
  templateUrl: './test.html',
  providers: [YourHttpTestService]

2017-04-26 18:55:26

Angular EXCEPTION:没有Http的提供程序

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