使用HttpClient Angular将JSON映射到TypeScript类

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

@NgModule({
  imports: [
    HttpClientModule
  ],
  ...
})
export class AppModule { }

export class User {
  id: number;
  name: string;
  email: string;
}

import { HttpClient } from '@angular/common/http';
import { Observable } from 'rxjs';
import { map } from 'rxjs/operators';

@Injectable()
export class UserService {
  private apiUrl = 'https://example.com/api/users';

  constructor(private http: HttpClient) { }

  getUsers(): Observable<User[]> {
    return this.http.get<any[]>(this.apiUrl).pipe(
      map(data => data.map(item => this.mapToUser(item)))
    );
  }

  private mapToUser(data: any): User {
    const user = new User();
    user.id = data.id;
    user.name = data.name;
    user.email = data.email;
    return user;
  }
}

import { Component, OnInit } from '@angular/core';
import { UserService } from './user.service';
import { User } from './user';

@Component({
  selector: 'app-user-list',
  template: `
    <ul>
      <li *ngFor="let user of users">{{ user.name }} ({{ user.email }})</li>
    </ul>
  `,
  providers: [UserService]
})
export class UserListComponent implements OnInit {
  users: User[];

  constructor(private userService: UserService) { }

  ngOnInit() {
    this.userService.getUsers().subscribe(users => {
      this.users = users;
    });
  }
}