java log4j.xml配置与使用 (详解及实例)

备注：log4j -- logger和category的区别这：logger是category的子类，category现在已经不提倡使用。

1、一般的log4j.xml的两种配置方式：

1、Logger 完成日志信息的处理
定义输出的层次和决定信息是否输出
DEBUG<INFO<WARN<ERROR

2、Appender 设置日志信息的去向
常用的:
org.apache.log4j.ConsoleAppender(控制台)
org.apache.log4j.FileAppender(文件)
org.apache.log4j.DailyRollingFileAppener(每天产生一个日志文件)
org.apache.log4j.RollingFileAppender(文件大小到达指定尺寸的时候产生一个新的文件)
org.apache.log4j.WriterAppender(将日志讯息以串流格式发送到任意指定的地方)
org.apache.log4j.JdbcAppender(将日志讯息保存到数据库中)

3、Layout 设置日志信息的输出样式
layout有以下几种:
org.apache.log4j.HTMLLayout(以HTML表格形式布局)
org.apache.log4j.SimpleLayout(包含日志讯息的级别和讯息字符串)
org.apache.log4j.TTCCLayout(包含日志产生的时间、执行绪、类别等讯息)
org.apache.log4j.PatterLayout(可以灵活地指定布局格式)

log4j.xml实例:

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
```
<appender name="filelog_appender"  
```

        class="org.apache.log4j.RollingFileAppender">

        <!-- 设置File参数：日志输出文件名 -->

        <param name="File" value="log/testlog4jxml_all.log" />

        <!-- 设置是否在重新启动服务时，在原有日志的基础添加新日志 -->

        <param name="Append" value="true" />

        <!-- 设置文件大小 -->

        <param name="MaxFileSize" value="1MB" />

        <!-- 设置文件备份 -->

        <param name="MaxBackupIndex" value="10000" />

        <!-- 设置输出文件项目和格式 -->

        <layout class="org.apache.log4j.PatternLayout">

            <param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss} %-5p (%c:%L)- %m%n" />

```
        </layout>  
```
```
    </appender>  
```
<appender name="A2" class="org.apache.log4j.ConsoleAppender">
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="[%d{yyyy-MM-dd HH:mm:ss}][%C-%M]%m%n" />
</layout>
</appender>
<logger name="com.jjm.dao">
<level value="DEBUG" />
<appender-ref ref="A1" />
</logger>
<root>
<priority value="DEBUG" />
<appender-ref ref="A2" />
</root>
</log4j:configuration>

以上来自：http://www.blogjava.net/thisliy/archive/2009/06/01/279377.html

2、 log4j.xml向db、发邮件多种接入方式：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration>
<appender name="CONSOLE" class="org.apache.log4j.ConsoleAppender">
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern"
value="%d - %c -%-4r [%t] %-5p %x - %m%n" />
</layout>
<filter class="org.apache.log4j.varia.LevelRangeFilter">
<param name="LevelMax" value="ERROR"/>
<param name="LevelMin" value="TRACE"/>
</filter>
</appender>
<appender name="FILE" class="org.apache.log4j.FileAppender">
<param name="File" value="C:/log4j1.log"/>
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern"
value="%d - %c -%-4r [%t] %-5p %x - %m%n" />
</layout>
</appender>
<appender name="DATABASE" class="org.apache.log4j.jdbc.JDBCAppender">
<param name="URL" value="jdbc:oracle:thin:@192.168.0.59:1521:oanet"/>
<param name="driver" value="oracle.jdbc.driver.OracleDriver"/>
<param name="user" value="hdczoa"/>
<param name="password" value="system"/>
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern"
value="INSERT INTO hdczoa.LOG4J(stamp,thread, info_level,class,message) VALUES ('%d', '%t', '%p', '%c', %m)" />
</layout>
</appender>
<appender name="MAIL"
class="org.apache.log4j.net.SMTPAppender">
<param name="threshold" value="debug" />
<!-- 日志的错误级别
<param name="threshold" value="fatal"/>
-->
<param name="BufferSize" value="512" />
<param name="From" value="test@163.com" />
<param name="SMTPHost" value="smtp.163.com" />
<param name="Subject" value="juyee-log4jMessage" />
<param name="To" value="test@163.com" />
<param name="SMTPUsername" value="test" />
<param name="SMTPPassword" value="test" />
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern"
value="%-d{yyyy-MM-dd HH:mm:ss.SSS} [%p]-[%c] %m%n" />
</layout>
</appender>
<appender name="ASYNC" class="org.apache.log4j.AsyncAppender">
<param name="BufferSize" value="256" />
<appender-ref ref="DATABASE" />
</appender>
<logger name="com.litt2.log4j" additivity="false">
<level value="WARN" />
<appender-ref ref="CONSOLE" />
</logger>
<category name="com.litt3">
<level value="DEBUG" />
<appender-ref ref="CONSOLE" />
<appender-ref ref="MAIL" />
</category>
<root>
<priority value="debug" />
<appender-ref ref="CONSOLE" />
<appender-ref ref="FILE" />
</root>
</log4j:configuration>

3、接入log4j.xml的web.xml的配置：

Web配置log4j,需求增加以下内容到WEB-INF/web.xml
　　<context-param>
        <param-name>webAppRootKey</param-name>
        <param-value>smilecargo.root</param-value>
    </context-param>
    <context-param>
        <param-name>log4jConfigLocation</param-name>
        <param-value>classpath:log4j.xml</param-value>
    </context-param>
    <context-param>
        <param-name>log4jRefreshInterval</param-name>
        <param-value>60000</param-value>
    </context-param>
　　<listener>
        <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
    </listener>
${smilecargo.root}是web工程相对路径

4、接入log4j.xml参数配置说明：

以上来自：http://www.cnblogs.com/tqsummer/archive/2010/08/26/1809232.html

5、备注：

<logger name="com.runway.bssp.activeXdemo" additivity="false">
<priority value ="info"/>
</logger>
调试时，加类似上面这个logger节点，可以定义只打印具体类，及莫个包下的日志

整合下供自己以后参考使用

将配置好的log4j.xml 放到项目的classpath下即可。我的是放在src下

[xhtml] view plain copy

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration xmlns:log4j='http://jakarta.apache.org/log4j/'>
<appender name="log4jTestDebug" class="org.apache.log4j.RollingFileAppender">
<param name="File" value="D:/work/log/test_log4j_debug.log"/>
<param name="Append" value="true"/>
<param name="MaxFileSize" value="5KB"/>
<param name="MaxBackupIndex" value="2"/>
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="%c %d{ISO8601}-- %p -- %m%n"/>
</layout>
<filter class="org.apache.log4j.varia.LevelRangeFilter">
<param name="LevelMin" value="DEBUG"/>
<param name="LevelMax" value="DEBUG"/>
</filter>
</appender>
<appender name="log4jTestLogInfo" class="org.apache.log4j.RollingFileAppender">
<param name="File" value="D:/work/log/test_log4j_info.log"/>
<param name="Append" value="true"/>
<param name="MaxFileSize" value="5KB"/>
<param name="MaxBackupIndex" value="2"/>
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="%c %d{ISO8601}-- %p -- %m%n"/>
</layout>
<filter class="org.apache.log4j.varia.LevelRangeFilter">
<param name="LevelMin" value="INFO"/>
<param name="LevelMax" value="INFO"/>
</filter>
</appender>
<category name="com.gzy">
<priority value="debug" />
<appender-ref ref="log4jTestLogInfo" />
<appender-ref ref="log4jTestDebug" />
</category>
<root>
<priority value="debug"/>
</root>
</log4j:configuration>

下面写个测试类进行测试

[java] view plain copy

package com.gzy;
import org.apache.log4j.Logger;
/**
* Created by IntelliJ IDEA.
* User: zunyong
* Date: 2011-4-27
* Time: 16:54:44
* To change this template use File | Settings | File Templates.
*/
public class Test {
private static final Logger log = Logger.getLogger(Test.class);
public static void main(String[] args) {
for(int i=0;i<10;i++){
log.info("Enter the main()....");
log.debug("Enter the main()....");
log.warn("Enter the main()....");
log.info("Enter the main()....");
System.out.println("this is a log4j test.");
log.info("log end.");
}
}
}

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java log4j.xml配置与使用 (详解及实例)

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