nestjs中异常过滤器Exceptionfilter的具体使用

{"exceptionCode":40005,"message":"自定义异常","path":"/"}

{"statusCode":500,"message":"Internal server error"}

import { HttpException } from "@nestjs/common";

/**
 * 定义基础异常类
 *
 * @export
 * @class BaseException
 * @extends {HttpException}
 */
export class BaseException extends HttpException {

  /**
   * Creates an instance of BaseException.
   * @param {number} exceptionCode 自定义异常编号
   * @param {string} errorMessage 提示信息
   * @param {number} statusCode 状态码
   * @memberof BaseException
   */
  constructor(public exceptionCode: number, public errorMessage: string, public statusCode: number) {
    super({ exceptionCode: exceptionCode, errorMessage: errorMessage }, statusCode);
  }

  /**
   * 获取自定义异常代码
   *
   * @return {*}
   * @memberof BaseException
   */
  getExceptionCode(): number {
    return this.exceptionCode;
  }

  getErrorMessage(): string {
    return this.errorMessage;
  }

  getStatusCode(): number {
    return this.statusCode;
  }
}

import { HttpStatus } from "@nestjs/common";
import { BaseException } from "./base.exception";

export class UnCauhtException extends BaseException {
  constructor() {
    super(40000, "系统运行异常，请联系管理员！", HttpStatus.FORBIDDEN);
  }
}

import { ArgumentsHost, ExceptionFilter, HttpException } from "@nestjs/common";
import { HttpArgumentsHost } from "@nestjs/common/interfaces";
import { BaseException } from "src/exceptions/base.exception";
import { Response, Request } from "express";

/**
 * 异常基础类过滤器
 *
 * @export
 * @class BaseExceptionFilter
 * @implements {ExceptionFilter<BaseException>}
 */
export abstract class BaseExceptionFilter implements ExceptionFilter<BaseException>
{
  /**
   * 异常类捕获
   *
   * @abstract
   * @param {BaseException} exception
   * @param {ArgumentsHost} host
   * @memberof BaseExceptionFilter
   */
  abstract catch(exception: BaseException, host: ArgumentsHost);

  /**
   * 获取http请求上下文参数
   *
   * @protected
   * @param {ArgumentsHost} host
   * @return {*}
   * @memberof BaseExceptionFilter
   */
  protected getHttpContext(host: ArgumentsHost) {
    return host.switchToHttp();
  }

  /**
   * 获取http 响应参数
   *
   * @protected
   * @param {HttpArgumentsHost} httpContext
   * @return {*}
   * @memberof BaseExceptionFilter
   */
  protected getResponse(httpContext: HttpArgumentsHost): Response {
    return httpContext.getResponse<Response>();
  }

  /**
   * 获取http请求参数
   *
   * @protected
   * @param {HttpArgumentsHost} httpContext
   * @return {*}
   * @memberof BaseExceptionFilter
   */
  protected getRequest(httpContext: HttpArgumentsHost): Request {
    return httpContext.getRequest<Request>();
  }

  /**
   * 写入异常信息到客户端
   *
   * @param {ArgumentsHost} host
   * @param {BaseException} exception
   * @memberof BaseExceptionFilter
   */
  protected writeToClient(host: ArgumentsHost, exception: BaseException) {
    const ctx = this.getHttpContext(host);
    if(exception instanceof BaseException){
      this.getResponse(ctx).status(exception.statusCode).json({
        exceptionCode: exception.getExceptionCode(),
        message: exception.getErrorMessage(),
        path: this.getRequest(ctx).url
      });
    }else {
      const httpException=exception ;
      this.getResponse(ctx).status(500).json({
        message: "未处理的异常",
        path: this.getRequest(ctx).url
      });
    }

  }
}

import { ArgumentsHost, Catch } from "@nestjs/common";
import { AuthException } from "src/exceptions/auth.exception";
import { BaseException } from "src/exceptions/base.exception";
import { BaseExceptionFilter } from "./base.exception.filter";

@Catch(AuthException)
export class AuthExceptionFilter extends BaseExceptionFilter
{
  constructor(){
    super();
    console.log("授权异常构造函数初始化"+new Date().toISOString());
  }
  catch(exception: AuthException, host: ArgumentsHost) {
    exception.exceptionCode=40002;
    console.log("授权异常执行"+new Date().toISOString());
    this.writeToClient(host,exception);
  }

}

import { Controller, ForbiddenException, Get, HttpException, HttpStatus, UseFilters } from '@nestjs/common';
import { AppService } from './app.service';
import { AuthException } from './exceptions/auth.exception';
import { BusinessException } from './exceptions/business.exception';
import { UnCauhtException } from './exceptions/uncauht.exception';
import { AuthExceptionFilter } from './filters/auth.exception.filter';
import { BusinessExceptionFilter } from './filters/business.exception.filter';


/**
 * 带有单个路由的基本控制器示例ff
 */
@UseFilters(AuthExceptionFilter,BusinessExceptionFilter)
@Controller()
export class AppController {
 constructor(private readonly appService: AppService) {}

 @Get()
 getHello(): string {
  //throw new Error("666");
  throw new BusinessException("自定义异常",HttpStatus.OK);
  throw new AuthException();
  throw new HttpException("自定义异常",HttpStatus.FORBIDDEN);
  return this.appService.getHello();
 }

 @Get("name")
 getName():string
 {
  return "guozhiqi";
 }
}