log4j簡單示例

1.新建一個java project 項目

2.導入log4j的jar包，我用的是log4j-1.2.17.jar

3.新建log4j.properties文件，在src目錄下：

內容如下：

log4j.rootLogger=debug,stdout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %p [%c] %m%n

 

4.新建一個class類

/**
 *
 */
package com.log.test;

import java.util.Properties;
import org.apache.log4j.Logger;
import org.apache.log4j.PropertyConfigurator;

/**
 * @author tucl
 *
 */
public class LogTest {

 //Logger log=Logger.getLogger(LogTest.class);
 
 public LogTest(){
  //log.warn("yes yes yes yes---------");
 }
 
 private static void initLog4j() {
  Properties prop = new Properties();

  prop.setProperty("log4j.rootLogger", "debug, CONSOLE");
  prop.setProperty("log4j.appender.CONSOLE", "org.apache.log4j.ConsoleAppender");
  prop.setProperty("log4j.appender.CONSOLE.layout", "org.apache.log4j.PatternLayout");
  prop.setProperty("log4j.appender.CONSOLE.layout.ConversionPattern", "%d{HH:mm:ss,SSS} [%t] %-5p %C{1} : %m%n");

  PropertyConfigurator.configure(prop);
  }

 
 public static void main(String[] args) {
  //PropertyConfigurator.configure("bin/log4j.properties");
  PropertyConfigurator.configure(ClassLoader.getSystemResource("log4j.properties"));
  //initLog4j();
  //System.out.println("test");
  Logger logger  =  Logger.getLogger(LogTest. class );
        logger.debug( " debug " );
        logger.debug("ceshi  ce s s s s s");
        logger.error( " error " );
   
 }
}

 

 //PropertyConfigurator.configure("bin/log4j.properties");
  PropertyConfigurator.configure(ClassLoader.getSystemResource("log4j.properties"));
  //initLog4j();