Question

我对Angular很新，但我会做一个非常简单的事情（我无法做到）...我想创建一个'基本服务'，它与我的api后端通信但是在设置之前东西（标题，变量......等等）...所有其他服务都必须调用这个'基本服务'来与api通信...这里我的代码：

import { Injectable } from '@angular/core';
import { HttpClient, HttpRequest, HttpHeaders, HttpParams, HttpResponse } from '@angular/common/http';
import { Observable } from 'rxjs/Rx';
import { responseModel } from '../models/response.model';

@Injectable()
export  class  BaseService {

    public headers: HttpHeaders;

    constructor(private _http: HttpClient) {  
        this.headers = new HttpHeaders();
        this.headers.append('Accept', 'application/json, */*');
        this.headers.append('Content-Type', 'application/json;charset=UTF-8');
    }

    private callBackEnd(relativeEndPoint: string,reqMethod: string,
        reqParams?: HttpParams, objBody?: any): Observable<responseModel> {

        const reqUrl = 'https://mypath/' + relativeEndPoint;
        return this._http.request<responseModel>(reqMethod, reqUrl,
            {
                body: objBody,
                headers: this.headers,
                params: reqParams,
                responseType: 'json',
                withCredentials: true
            }
        );
    }

    handleError(error: any): Observable<responseModel> {
        const out: responseModel= {
            error: !error.ok,
            code: "10",
            message: "no connection",
            more_info: "info@cr",
            response: {}
        }

        return Observable.create(observer => {
            observer.next(out);
            observer.complete();
        });
    }
}

非常简单......每个有“BaseService”DI的服务都可以调用

/*IMPORT EVERYTHING*/

@Injectable()
export class CustomService {

  constructor(private _http: BaseService) {

  }

  examplefunction(): Observable<responseModel> 
  {
      return this._http.callBackEnd( '/user/', 'GET')
      .map(
          response => {
               console.log( JSON.stringify(response));
          return response;
          }
          )
   }

}

我创建了一个简单的组件

import { Component, OnInit } from '@angular/core';
import { CustomService } from './CustomService.service';
import { responseBE } from '../global/models/response.model';

@Component({
  selector: 'app-simple',
  templateUrl: './simple.component.html',
  styleUrls: ['./simple.component.css']
})
export class SimpleComponent implements OnInit {

  constructor(private _service: CustomService ) { }

  ngOnInit() {

    this._service.examplefunction()
      .map(res => {
        console.log(res);
      });
  }

}

但没有任何作用：（

任何想法？

Answer 1

我认为你缺少订阅，因为Observable需要订阅才能执行。

this._service.examplefunction()
  .subscribe(res => {
    console.log(res);
  });

Angular 4/5 HttpClient定制服务

1 个答案: