17_异常拦截器

import { ArgumentsHost, Catch, ExceptionFilter, HttpException } from '@nestjs/common';
import { Request, Response } from 'express';
// 和全局拦截器不一样,这里我们使用@Catch装饰器并且传入HttpException类
@Catch(HttpException)
export class HttpFilter implements ExceptionFilter {
  catch(exception: HttpException, host: ArgumentsHost) {
    // 获取http错误信息
    const ctx = host.switchToHttp();
    // 获取请求信息
    const request = ctx.getRequest<Request>();
    // 获取响应信息
    const response = ctx.getResponse<Response>();
    // 获取请求返回状态信息
    const status = exception.getStatus();
    // 返回一些内容
    response.status(status).json({
      success: false,
      time: new Date(),
      data: exception.message,
      status,
      path:request.url
    });
  }
}

import { HttpFilter } from './common/filter';
app.useGlobalFilters(new HttpFilter());