tutorial-angular/src/app/dtcservice/user.service.ts

import { Injectable } from '@angular/core';
import {User} from '../dtcservice/user';
import { Observable, of } from 'rxjs';
import { HttpClient, HttpHeaders } from '@angular/common/http';

const httpOptions = {
  headers: new HttpHeaders({ 'Content-Type': 'application/json' })
};

@Injectable({
  providedIn: 'root'
})
export class UserService {
  constructor(private http: HttpClient) { }
  private apihost = 'http://localhost:8080';

  getUsers(): Observable<User[]> {
    return this.http.get<User[]>(this.apihost+'/user');
  }

  addUser(user:User):Observable<User>{
    return this.http.post<User>(this.apihost+"/user",user,httpOptions);
  }

  updateUser (user: User, id:number): Observable<any> {
    return this.http.put(`${this.apihost}/user/${id}`, user, httpOptions);
  }

  getUser(id: number): Observable<User> {
    const url = `${this.apihost}/user/${id}`;
    return this.http.get<User>(url);
  }

  deleteUser(id:number):Observable<any>{
    return this.http.delete(`${this.apihost}/user/${id}`);
  }

}