一般开发过程中不不会根据httpcode来判断接口请求成功与失败的,而是会根据请求返回的数据,里面加上code字段
一、返回的数据格式对比
1、直接返回的数据格式
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{ "id": 1, "uuid": "cbbe7abc-b95e-48a0-8d24-b1ac93c45328", "name": "哈士奇1", "age": 12, "color": null, "createAt": "2019-07-25T09:13:30.000Z", "updateAt": "2019-07-25T09:13:30.000Z"} |
2、我们自己包装后的返回数据
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{ code: 0, message: "请求成功", data: { "id": 1, "uuid": "cbbe7abc-b95e-48a0-8d24-b1ac93c45328", "name": "哈士奇1", "age": 12, "color": null, "createAt": "2019-07-25T09:13:30.000Z", "updateAt": "2019-07-25T09:13:30.000Z" }} |
二、拦截全部的错误请求,统一返回格式
1、使用命令创建一个过滤器
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nest g f filters/httpException |
2、过滤器的代码
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import { ArgumentsHost, Catch, ExceptionFilter, HttpException, HttpStatus, Logger,} from '@nestjs/common';@Catch(HttpException)export class HttpExceptionFilter implements ExceptionFilter { catch(exception: HttpException, host: ArgumentsHost) { const ctx = host.switchToHttp(); const response = ctx.getResponse(); const request = ctx.getRequest(); const message = exception.message.message; Logger.log('错误提示', message); const errorResponse = { data: { error: message, }, // 获取全部的错误信息 message: '请求失败', code: 1, // 自定义code url: request.originalUrl, // 错误的url地址 }; const status = exception instanceof HttpException ? exception.getStatus() : HttpStatus.INTERNAL_SERVER_ERROR; // 设置返回的状态码、请求头、发送错误信息 response.status(status); response.header('Content-Type', 'application/json; charset=utf-8'); response.send(errorResponse); }} |
3、在main.ts中全局注册
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...import { HttpExceptionFilter } from './filters/http-exception.filter';async function bootstrap() { ... // 全局注册错误的过滤器 app.useGlobalFilters(new HttpExceptionFilter());}bootstrap(); |
4、测试,返回的错误信息
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{ "statusCode": 400, "error": "Bad Request", "data": { "message": [ { "age": "必须的整数" } ] }, "message": '请求失败', "code": 1, "url": "/api/v1/cat"} |
三、统一请求成功的返回数据
1、创建一个拦截器src/interceptor/transform.interceptor.ts
2、拦截器的代码
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import { Injectable, NestInterceptor, CallHandler, ExecutionContext,} from '@nestjs/common';import { map } from 'rxjs/operators';import { Observable } from 'rxjs';interface Response<T> { data: T;}@Injectable()export class TransformInterceptor<T> implements NestInterceptor<T, Response<T>> { intercept( context: ExecutionContext, next: CallHandler<T>, ): Observable<Response<T>> { return next.handle().pipe( map(data => { return { data, code: 0, message: '请求成功', }; }), ); }} |
3、全局注册
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...import { TransformInterceptor } from './interceptor/transform.interceptor';async function bootstrap() { ... // 全局注册拦截器 app.useGlobalInterceptors(new TransformInterceptor()); ...}bootstrap(); |
4、测试返回数据
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{ "data": { "id": 1, "uuid": "cbbe7abc-b95e-48a0-8d24-b1ac93c45328", "name": "哈士奇1", "age": 12, "color": null, "createAt": "2019-07-25T09:13:30.000Z", "updateAt": "2019-07-25T09:13:30.000Z" }, "code": 0, "message": "请求成功"} |
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原文链接：https://blog.csdn.net/kuangshp128/article/details/97240664
