如何使用angular9拦截器？-木庄网络博客

本文摘自PHP中文网，作者青灯夜游，侵删。

相关教程推荐：《angular教程》

拦截器统一添加token

我们在做一个后台管理系统时,需要给每个请求的请求头里面添加token,所以下面我们来了解一下angular的拦截器,并使用

拦截器使用

1.创建http.service.ts,用于网络请求

import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
 
@Injectable({
  providedIn: 'root'
})
export class HttpService {
 
  constructor(private http: HttpClient) { }
  getData () {
    return this.http.get('/assets/mock/data.json')
  }
}

2.创建noop.interceptor.ts,拦截器实现代码

import { Injectable } from '@angular/core';
import {
  HttpEvent, HttpInterceptor, HttpHandler, HttpRequest, HttpResponse
} from '@angular/common/http';
 
import { Observable } from 'rxjs';
import { tap } from 'rxjs/operators';
import { Router } from '@angular/router';
 
/** Pass untouched request through to the next request handler. */
@Injectable()
export class NoopInterceptor implements HttpInterceptor {
    constructor (private router: Router) {}
  intercept(req: HttpRequest<any>, next: HttpHandler):
    Observable<HttpEvent<any>> {
    // 拦截请求,给请求头添加token
    let url = req.url // 可以对url进行处理
    let token = document.cookie && document.cookie.split("=")[1]
    // 登录请求排除在外
    // if (!url.includes('login')) {
        req = req.clone({
            url, // 处理后的url,再赋值给req
            headers: req.headers.set('Authorization', token)//请求头统一添加token
        })
    // }
    return next.handle(req).pipe(
        tap(
         event => {
          if (event instanceof HttpResponse) {
           console.log(event);
           if (event.status >= 500) {
            // 处理错误
           }
          }
         },
         error => {
          // token过期 服务器错误等处理
        //   this.router.navigate(['/login']);
         })
       );
  }
}

3.在app.module.ts中使用

3.1imports中引入HttpClientModule

3.2HttpService的注册

3.3NoopInterceptor拦截器的使用

import { HttpClientModule, HTTP_INTERCEPTORS } from '@angular/common/http';
import { HttpService } from './auth/http.service';
import { NoopInterceptor } from './auth/noop.interceptor';
@NgModule({
   imports: [
      BrowserModule,
      HttpClientModule,
      AppRoutingModule
   ],
   providers: [
      HttpService,
      { provide: HTTP_INTERCEPTORS, useClass: NoopInterceptor, multi: true }
   ],
   // ... 省略
})