如何在角度服务中注入API_BASE_URL(字符串)

时间:2018-01-10 07:27:34

标签: angular nswag

此自动生成的服务(由NSwagStudio)需要API_BASE_URL(InjectionToken)值才能执行http请求 如何以及在哪里注射它?

/* tslint:disable */
//----------------------
// <auto-generated>
//     Generated using the NSwag toolchain v11.12.16.0 (NJsonSchema v9.10.19.0 (Newtonsoft.Json v9.0.0.0)) (http://NSwag.org)
// </auto-generated>
//----------------------
// ReSharper disable InconsistentNaming

import 'rxjs/add/observable/fromPromise';
import 'rxjs/add/observable/of';
import 'rxjs/add/observable/throw';
import 'rxjs/add/operator/map';
import 'rxjs/add/operator/toPromise';
import 'rxjs/add/operator/mergeMap';
import 'rxjs/add/operator/catch';

import { Observable } from 'rxjs/Observable';
import { Injectable, Inject, Optional, InjectionToken } from '@angular/core';
import { HttpClient, HttpHeaders, HttpParams, HttpResponse, HttpResponseBase, HttpErrorResponse } from '@angular/common/http';

export const API_BASE_URL = new InjectionToken<string>('API_BASE_URL');

@Injectable()
export class DocumentService {
    private http: HttpClient;
    private baseUrl: string;
    protected jsonParseReviver: ((key: string, value: any) => any) | undefined = undefined;

    constructor(@Inject(HttpClient) http: HttpClient, @Optional() @Inject(API_BASE_URL) baseUrl?: string) {
        this.http = http;
        this.baseUrl = baseUrl ? baseUrl : "";
    }

    getAll(): Observable<string[] | null> {
        let url_ = this.baseUrl + "/api/Document";
        url_ = url_.replace(/[?&]$/, "");

        let options_ : any = {
            observe: "response",
            responseType: "blob",
            headers: new HttpHeaders({
                "Content-Type": "application/json", 
                "Accept": "application/json"
            })
        };

        return this.http.request("get", url_, options_).flatMap((response_ : any) => {
            return this.processGetAll(response_);
        }).catch((response_: any) => {
            if (response_ instanceof HttpResponseBase) {
                try {
                    return this.processGetAll(<any>response_);
                } catch (e) {
                    return <Observable<string[] | null>><any>Observable.throw(e);
                }
            } else
                return <Observable<string[] | null>><any>Observable.throw(response_);
        });
    }

    protected processGetAll(response: HttpResponseBase): Observable<string[] | null> {
        ...........code
        ........
        ....
    }
}

有人可以给我一些关于InjectioToken如何工作以及如何将其注入此服务的超快速提示吗?

Angular5 - Nswag

3 个答案:

答案 0 :(得分:7)

在父模块上,为API_BASE_URL创建一个提供程序

export function getBaseUrl(): string {
  return AppConsts.baseUrl;
}

@NgModule({
  declarations: [AppComponent],
  imports: [BrowserModule],
  providers: [{ provide: API_BASE_URL, useFactory: getBaseUrl }],
   bootstrap: [AppComponent]
})
export class AppModule {}

,然后定义具有此类静态属性的AppConsts类

export class AppConsts {
  static baseUrl = "your_api_base_url"; 
}

为我工作,希望对您有所帮助。该解决方案基于aspnet样例项目,对我而言,该项目提供了最佳的体系结构标准。 我将angular project的网址和此specific code的网址留在这里。

答案 1 :(得分:6)

如上所述,最好将其放在您的环境设置中,然后Angular会根据您所处的环境替换相应的基本url,例如在开发中:

export const environment = {

    production: false,
    apiRoot: "https://localhost:1234",
};

然后,您可以在提供程序中使用useValue(为简单起见,其他所有内容都已删除):

...
import { environment } from '@env/environment';

@NgModule({

    imports: [ ... ],

    declarations: [ ... ],

    providers: [

        {
            provide: API_BASE_URL,
            useValue: environment.apiRoot
        },
        ...
    ]

    exports: [ ... ]
})
export class AppModule {}

要使用上述的@env别名,您需要对tsconfig.json进行如下添加:

{
    ...
    "compilerOptions": {
        "baseUrl": "src",
        "paths": {
            "@env/*": [ "environments/*" ]
        },
    etc...
}

然后Angular将根据所使用的--- env标志替换相应的环境设置。

答案 2 :(得分:1)

将所有常量放在environment.ts和environment.prod.ts中的最佳做法。只需创建一个新属性并导入您的服务。您的代码将如下所示:

// environment.ts
export const environment = {
  production: false,
  API_BASE_URL: "baseUrlOfApiForDevelopment",
};

// environment.prod.ts
export const environment = {
  production: false,
  API_BASE_URL: "baseUrlOfApiForProduction",
};

现在您需要导入服务才能使用它。