1.我按照angular官方文檔實(shí)現(xiàn)了httpclient發(fā)出http請(qǐng)求。文檔鏈接
2.我嘗試按文檔在項(xiàng)目中實(shí)現(xiàn)攔截器,這是我的代碼:
Universal.Interceptor.ts
import { Injectable, Inject,Injector, Optional } from '@angular/core';
import { HttpEvent, HttpInterceptor, HttpHandler, HttpRequest, HttpResponse } from '@angular/common/http';
import { Observable } from 'rxjs/observable';
import { StorageService } from '../../shared/storage.service';
import { enable, destroy } from 'splash-screen';
import 'rxjs/add/operator/do';
@Injectable()
export class UniversalInterceptor implements HttpInterceptor {
private _StorageService: StorageService;
constructor(private injector: Injector) {}
intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
console.log(req)
return next.handle(req);
}
}```
app.module.ts
...
**import { HTTP_INTERCEPTORS } from '@angular/common/http';**
**import { UniversalInterceptor } from './core/Interceptor/Universal.Interceptor';**
@NgModule({
declarations: [
AppComponent
],
...
**providers: [{ provide: HTTP_INTERCEPTORS, useClass: UniversalInterceptor, multi: true }],**
bootstrap: [AppComponent]
})
}
項(xiàng)目的http請(qǐng)求還是正常的,但攔截器的console.log沒(méi)有打印,項(xiàng)目也沒(méi)有報(bào)錯(cuò),是否引入少了內(nèi)容?Universal.Interceptor.ts文件是我手動(dòng)創(chuàng)建的,是否跟這個(gè)有關(guān)系?有沒(méi)有使用這個(gè)攔截器的
你好,升級(jí)到4.3以后,新多出個(gè)HttpClient模塊,如果要使用攔截器,需要,將老的http改為,HttpClient.
相關(guān)代碼:
import { HttpClient } from '@angular/common/http';
this.http.get<UserResponse>('https://api.github.com/users/seeschweiler').subscribe(
data => {
console.log("User Login: " + data.login);
console.log("Bio: " + data.bio);
console.log("Company: " + data.company);
},
err => {
console.log("Error occured.")
}
);
我猜是你的攔截器并沒(méi)有被使用。參考如下:
import { Injectable } from '@angular/core';
import { Http, Request, RequestOptionsArgs, Response, RequestOptions, ConnectionBackend, Headers, XHRBackend } from '@angular/http';
import { Observable } from 'rxjs/Observable';
@Injectable()
export class CustomHttp extends Http {
constructor(
backend: ConnectionBackend,
defaultOptions: RequestOptions
) {
super(backend, defaultOptions);
}
request(url: string | Request, options ?: RequestOptionsArgs): Observable < Response > {
return this.intercept(super.request(url, options));
}
get(url: string, options ?: RequestOptionsArgs): Observable < Response > {
return this.intercept(super.get(url, options));
}
post(url: string, body: string, options ?: RequestOptionsArgs): Observable < Response > {
return this.intercept(super.post(url, body, this.getRequestOptionArgs(options)));
}
put(url: string, body: string, options?: RequestOptionsArgs): Observable < Response > {
return this.intercept(super.put(url, body, this.getRequestOptionArgs(options)));
}
delete(url: string, options ?: RequestOptionsArgs): Observable < Response > {
return this.intercept(super.put(url, this.getRequestOptionArgs(options)));
}
getRequestOptionArgs(options ?: RequestOptionsArgs): RequestOptionsArgs {
if (options == null) {
options = new RequestOptions();
}
if (options.headers == null) {
options.headers = new Headers();
}
options.headers.append('Content-Type', 'application/json');
return options;
}
// 攔截器
intercept(observable: Observable < Response >): Observable < Response > {
console.log('請(qǐng)求前');
return Observable.create((observer) => {
observable.subscribe(res => {
observer.next(res);
}, (err) => {
observer.error(err);
}, () => {
console.log('complete');
observer.complete();
});
});
}
}
export let providerHttp = ( backend: XHRBackend,
defaultOptions: RequestOptions
) => new CustomHttp(backend, defaultOptions);
然后在app.module.ts中
providers: [
{
provide: Http,
useFactory: providerHttp,
deps: [XHRBackend, RequestOptions, LoadingBarService]
}
],
這是我的攔截器:
import {Injectable} from "@angular/core";
import {HttpEvent, HttpHandler, HttpInterceptor} from "@angular/common/http";
import {HttpRequest} from "@angular/common/http";
import {Observable} from "rxjs/Observable";
@Injectable()
export class MyInterceptor implements HttpInterceptor {
constructor() {
}
intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
const clonedRequest = req.clone({
headers: req.headers.set('X-CustomAuthHeader', 'AuthHeader')
});
console.log('request', clonedRequest);
console.log("Observable", next.handle(clonedRequest));
return next.handle(clonedRequest);
}
}
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