Nodejs日志管理包

　　Nodejs日志管理工具包：log4js 和 winston

1、log4js的使用

　　1）package.json中加入依赖

"log4js":"~0.6.21"

　　2）写一个log4js的配置文件log4js_conf.json

{
  "appenders": [
    {
      "type": "console"
    },
    {
      "type": "file",
      "filename": "logs/access.log",
      "maxLogSize": 1024,
      "backups": 3,
      "category": "normal"
    }
  ]
}

　　3）写一个工具类log4js-utils.js

var log4js = require(‘log4js‘);

/**
log4js.configure({
  appenders: [
    { type: ‘console‘ },
    { type: ‘file‘, filename: ‘logs/access.log‘, category: ‘normal‘ }
  ]
});

*/

log4js.configure(‘E:/Node/file-server/config/log4js_conf.json‘);

exports.logger = function(){
    var logger = log4js.getLogger(‘normal‘);//获取配置文件中category为normal的appender
    logger.setLevel(‘DEBUG‘);
    return logger;
}

　　4）在其他需要使用日志的地方引入工具类

var logger = require(‘../utils/log4js-utils‘).logger();

exports.index = function(req,res) {
    logger.debug(‘debug‘);
    logger.info(‘info‘);
    logger.warn(‘warn‘);
    logger.error(‘error‘);
    res.send(‘ok‘);
}

2、winston

　　winston的使用也很简单，不多说。

var winston = require(‘winston‘);

exports.logger = new (winston.Logger)({
    transports: [
      new (winston.transports.Console)(),
      new (winston.transports.File)({ filename: ‘logs/all.log‘ })
    ],
    exceptionHandlers: [
      new winston.transports.File({ filename: ‘logs/exceptions.log‘ })
    ],
    exitOnError:false
});

var logger = require(‘../utils/winston-utils‘).logger;

exports.index = function(req,res) {
    logger.log(‘error‘, "log");
      logger.info("info");
      logger.warn("warn");
      logger.error("error");
    res.send(‘ok‘);
}