nodejs整合log4js输出日志

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')
};

//用来与express结合

exports.useLogger = function (app, logger) {
    app.use(log4js.connectLogger(logger || log4js.getLogger('default'), {

//自定义输出格式

        format: '[:remote-addr :method :url :status :response-timems][:referrer HTTP/:http-version :user-agent]'
    }))
};

使用日志:

const log4js = require('../../util/Log4J');

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);