Nest 中打印日志 ​

import { ConsoleLogger, Controller, Get, Logger } from '@nestjs/common';
import { AppService } from './app.service';

@Controller()
export class AppController {
  private logger = new Logger();

  constructor(private readonly appService: AppService) {}

  @Get()
  getHello(): string {
    this.logger.debug('aaa', AppController.name);
    this.logger.error('bbb', AppController.name);
    this.logger.log('ccc', AppController.name);
    this.logger.verbose('ddd', AppController.name);
    this.logger.warn('eee', AppController.name);
    
    return this.appService.getHello();
  }
}

import { LoggerService, LogLevel } from '@nestjs/common';

export class MyLogger implements LoggerService {
    log(message: string, context: string) {
        console.log(`---log---[${context}]---`, message)
    }

    error(message: string, context: string) {
        console.log(`---error---[${context}]---`, message)
    }

    warn(message: string, context: string) {
        console.log(`---warn---[${context}]---`, message)
    }
}

import { ConsoleLogger } from '@nestjs/common';

export class MyLogger2 extends ConsoleLogger{
    log(message: string, context: string) {
        console.log(`[${context}]`,message)
    }
}

import { Inject } from '@nestjs/common';
import { ConsoleLogger, Injectable } from '@nestjs/common';
import { AppService } from './app.service';

@Injectable()
export class MyLogger3 extends ConsoleLogger{
    @Inject(AppService)
    private appService: AppService;

    log(message, context) {
        console.log(this.appService.getHello());
        console.log(`[${context}]`, message);
        console.log('--------------')
    }
}

import { Inject, Injectable } from '@nestjs/common';
import { MyLogger } from './logger2/MyLogger';

@Injectable()
export class AppService {

  @Inject(MyLogger)
  private logger: MyLogger;

  getHello(): string {
    this.logger.log('yyy', AppService.name);
    
    return 'Hello World!';
  }
}