Angular网络请求的封装方法

 this.http.post(url, param, config).subscribe(
   (res) => {
    //...请求成功
   }, (err) => {
    //...请求失败
   }, () => {
    //...请求完成
   }
  );

export interface OnHttpImp {

 onResult(result: HttpResult, code?: number): void;

 onError?(err：any): void;

 onComplete?(): void;
}

export class HttpResult {
 code?: number;
 data?: any;
 msg?: string;
}

 public post(url: string, param: FormData, callback: OnHttpImp, code?: number) {
  url = Config.base + url;
  const headers = new Headers();
  headers.append('Content-Type', 'application/x-www-form-urlencoded');
  this.http.post(url, param, {}).subscribe(
   (res) => {
    if (code) {
     callback.onResult(res, code);
    } else {
     callback.onResult(res);
    }
   }, (err) => {
    console.log(url + '===>' + JSON.stringify(err));
   }, () => {
    if (callback.onComplete) {
     callback.onComplete();
    }
   }
  );
 }

export class LoginComponent implements OnInit, OnHttpImp {
 public validateForm: FormGroup;
 public username_control: AbstractControl;
 public password_control: AbstractControl;

 constructor(private fb: FormBuilder,
       private http: HttpUtil) {
 }

 ngOnInit() {
  this.validateForm = this.fb.group({
   'userName': [null, [Validators.required]],
   'password': [null, [Validators.required]],
   remember: [true],
  });
  this.username_control = this.validateForm.controls['userName'];
  this.password_control = this.validateForm.controls['password'];
 }


 _submitForm() {
  const params = new FormData();
  const md5 = new Md5();
  const password = md5.appendStr(this.password_control.value).end();
  params.set('username', this.username_control.value);
  params.set('password', password.toString());
  this.http.post('/user/login', params, this);
 }

 onResult(result: HttpResult, code?: number): void {
  //如果多个网络请求，需要传入code值，根据code值来判断请求来源
  //swthch(code){
  //  case 100:
  //  
  //  break;
  //}
  
  // 如果单个请求，直接处理请求结果。
  // console.log(result)
  
 }
}