Node.js日志管理log4js

 

log4js的输出级别6个: trace, debug, info, warn, error, fatal

 

1、安装log4js

npm install log4js

 

2、代码app.js

var express = require("express");
var app = express();

var log4js = require("./logger");
var logger = log4js.logger("normal","info");

/**
日志级别对应规则：
http responses 3xx, level = WARN
http responses 4xx & 5xx, level = ERROR
else, level = INFO
**/
app.use(log4js.connectLogger(logger,{level:"auto"}));

app.all("*",function(req,res,next){
	logger.info(req.ip+"  "+req.originalUrl+" access");
	next();
});

app.all("/hello",function(req,res,next){
	res.sendfile("hello.html");
});
app.all("/hello2",function(req,res,next){
	res.send("hello");
});

app.listen(3000,function(){
	logger.trace("服务启动trace");
	logger.debug("服务启动debug");
	logger.info("服务启动info");
	logger.warn("服务启动warn");
	logger.error("服务启动error");
	logger.fatal("服务启动fatal");
	console.log("服务启动console.log");
});

 

3、代码logger.js

var log4js = require("log4js");
log4js.configure({
	appenders:[
		{
			type:"console"//控制台输出日志
		},
		{
			type:"file",// 文件记录日志
			filename:'logs/access.log',// logs目录必须手动新建
			maxLogSize:1024,//文件最大size 单位：K
			backups:3,// 备份文件总数,默认1
			category:'normal'//日志类型，下面getLogger对象就是根据这个
		}
	],
	replaceConsole:true	//以[INFO] console代替console默认样式
});

exports.logger = function(category,level){
	var logger = log4js.getLogger(category);
	logger.setLevel(level);
	return logger;
}

exports.connectLogger = function(logger,options){
	return log4js.connectLogger(logger,options);
}

 

4、运行输出