nodejs整合log4js输出日志文件

引入log4js依赖,配置类如下:const log4js = require(‘log4js‘);log4js.configure({    replaceConsole: true,    pm2: true,    appenders: {        stdout: {//控制台输出            type: ‘console‘        },        req: {  //请求转发日志            type: ‘dateFile‘,    //指定日志文件按时间打印            filename: ‘../logs/reqlog/req‘,  //指定输出文件路径            pattern: ‘yyyy-MM-dd.log‘,            alwaysIncludePattern: true        },        err: {  //错误日志            type: ‘dateFile‘,            filename: ‘../logs/errlog/err‘,            pattern: ‘yyyy-MM-dd.log‘,            alwaysIncludePattern: true        },        oth: {  //其他日志            type: ‘dateFile‘,            filename: ‘../logs/othlog/oth‘,            pattern: ‘yyyy-MM-dd.log‘,            alwaysIncludePattern: true        }

    },    categories: {        //appenders:采用的appender,取appenders项,level:设置级别        default: { appenders: [‘stdout‘, ‘req‘], level: ‘debug‘ },        err: { appenders: [‘stdout‘, ‘err‘], level: ‘error‘ },    }});

exports.getLogger = function (name) {//name取categories项    return log4js.getLogger(name || ‘default‘)};

exports.useLogger = function (app, logger) {//用来与express结合    app.use(log4js.connectLogger(logger || log4js.getLogger(‘default‘), {        format: ‘[:remote-addr :method :url :status :response-timems][:referrer HTTP/:http-version :user-agent]‘//自定义输出格式    }))};使用:

const logger = log4js.getLogger();const errLog = log4js.getLogger(‘err‘);

打印debug级别的日志信息:logger.info(‘req的值是:‘ + req);打印error级别的日志信息:errLog.error(e);

原文地址：https://www.cnblogs.com/mlzdev/p/11561597.html