jee、spring、spring mvc、mybatis 学习（十）

Log4j日志使用
Apache的开源项目log4j是一个强大的日志组件，提供方便的日志记录。

1、下载：【log4j-1.2.16.jar】包。

2、在【src/sources/】中新建【log4j.properties】文件。内容如下：

### \u8BBE\u7F6E###
log4j.rootLogger = debug,stdout,D,E

### \u8F93\u51FA\u4FE1\u606F\u5230\u63A7\u5236\u62AC ###
log4j.appender.stdout = org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target = System.out
log4j.appender.stdout.layout = org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern = [%-5p] %d{yyyy-MM-dd HH:mm:ss,SSS} method:%l%n%m%n

### \u8F93\u51FADEBUG \u7EA7\u522B\u4EE5\u4E0A\u7684\u65E5\u5FD7\u5230=E://logs/error.log ###
log4j.appender.D = org.apache.log4j.DailyRollingFileAppender
log4j.appender.D.File = E://logs/log.log
log4j.appender.D.Append = true
log4j.appender.D.Threshold = DEBUG
log4j.appender.D.layout = org.apache.log4j.PatternLayout
log4j.appender.D.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n

### \u8F93\u51FAERROR \u7EA7\u522B\u4EE5\u4E0A\u7684\u65E5\u5FD7\u5230=E://logs/error.log ###
log4j.appender.E = org.apache.log4j.DailyRollingFileAppender
log4j.appender.E.File =E://logs/error.log
log4j.appender.E.Append = true
log4j.appender.E.Threshold = ERROR
log4j.appender.E.layout = org.apache.log4j.PatternLayout
log4j.appender.E.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n

3、新建一个junit测试类：【TestLog.java】内容如下：

注意加载文件的方式：【PropertyConfigurator.configure("src/sources/log4j.properties");】

package testJunit;

import java.io.File;

import org.apache.log4j.Logger;
import org.apache.log4j.PropertyConfigurator;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

public class TestLog {

private static Logger logger = Logger.getLogger(TestLog.class);

@Test
public void xixi(){

PropertyConfigurator.configure("src/sources/log4j.properties");

// 记录debug级别的信息
logger.debug("This is debug message.");
// 记录info级别的信息
logger.info("This is info message.");
// 记录error级别的信息
logger.error("This is error message.");

System.out.println("fdsa");
}
}

4、在JEE的【web.xml】文件中配置日志文件，方式方法如下：

<!-- 添加日志文件 -->
<context-param>
<param-name>log4jConfigLocation</param-name>
<param-value>classpath:sources/log4j.properties</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
</listener>

5、源代码：http://download.csdn.net/detail/qq5132834/9609569

6、参考文章：

http://www.cnblogs.com/ITtangtang/p/3926665.html

  http://www.codeceo.com/article/log4j-usage.html