到目前为止我发现的最佳实践是首先创建全局服务并创建与http相关的方法
那里。即获取、放置、发布、删除请求等,而不是通过使用这些方法调用您的 API 服务请求和
使用 catch 块捕获错误并根据需要显示消息,例如:-
Global_Service.ts
import {Injectable} from '@angular/core';
import {Http, Response, RequestOptions, Headers, Request, RequestMethod} from '@angular/http';
import {Observable} from 'rxjs/Rx';
import 'rxjs/Rx';
@Injecable()
export class GlobalService {
public headers: Headers;
public requestoptions: RequestOptions;
public res: Response;
constructor(public http: Http) { }
public PostRequest(url: string, data: any): any {
this.headers = new Headers();
this.headers.append("Content-type", "application/json");
this.headers.append("Authorization", 'Bearer ' + key );
this.requestoptions = new RequestOptions({
method: RequestMethod.Post,
url: url,
headers: this.headers,
body: JSON.stringify(data)
})
return this.http.request(new Request(this.requestoptions))
.map((res: Response) => {
return [{ status: res.status, json: res }]
})
.catch((error: any) => { //catch Errors here using catch block
if (error.status === 500) {
// Display your message error here
}
else if (error.status === 400) {
// Display your message error here
}
});
}
public GetRequest(url: string, data: any): any { ... }
public PutRequest(url: string, data: any): any { ... }
public DeleteRequest(url: string, data: any): any { ... }
}
最好在像这样引导您的应用程序时将此服务作为依赖项提供:-
bootstrap (APP, [GlobalService, .....])
比您想调用请求的任何地方都使用这些全局服务方法调用请求,如下所示:-
demo.ts
export class Demo {
...
constructor(public GlobalService: GlobalService) { }
getMethodFunction(){
this.GlobalService.PostRequest(url, data)
.subscribe(res => {console.log(res),
err => {console.log(err)}
});
}
另见