log4j按级别分类输出日志到相对路径日志文件

按级别分类输出日志 log4j.xml配置示例

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">

<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">

<!--输出到控制台  -->

<appender name="console" class="org.apache.log4j.ConsoleAppender">
<param name="Threshold" value="ERROR"/>
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="%d %-5p [%C] %m%n"/>
</layout>
</appender>

<!-- error级别的日志输出到文件 是为了看后台报的异常 -->

<appender name="file" class="org.apache.log4j.RollingFileAppender">
<param name="Threshold" value="ERROR"/>
<param name="File" value="${logfilepath}log-error.log"/><!-- 相对路径啊 -->
<param name="Append" value="true"/>
<param name="MaxFileSize" value="1MB"/>
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="%d %-5p [%C] %m%n"/>
</layout>
</appender>

<!-- debug到info级别的信息输出到另外一个文件  是为了看后台执行的sql语句 -->

<appender name="file_sql" class="org.apache.log4j.RollingFileAppender">
<param name="File" value="${logfilepath}beehive-sql_new.log"/>
<param name="Append" value="true"/>
<param name="MaxFileSize" value="1MB"/>
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="%d %-5p [%C] %m%n"/>
</layout>
<filter class="org.apache.log4j.varia.LevelRangeFilter">
<param name="levelMin" value="debug" />
<param name="levelMax" value="info" />
<param name="AcceptOnMatch" value="true" />
</filter>
</appender>

<logger name="org.apache.beehive.controls.system.jdbc" additivity="true">
<level value="DEBUG" />
</logger>

<root>
<level value ="ERROR"/>
<appender-ref ref="console"/>
<appender-ref ref="file"/>
<appender-ref ref="file_sql"/>
</root>

</log4j:configuration>

package util;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Properties;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.log4j.Logger;
import org.apache.log4j.PropertyConfigurator;
import org.apache.log4j.xml.DOMConfigurator;

public class Log4jInit extends HttpServlet {

private static final long serialVersionUID = 1L;
private static Logger logger = Logger.getLogger(Log4jInit.class);

public void init() {
String path = this.getServletContext().getRealPath("/");
String file = this.getInitParameter("log4j_init_path");
String logFile = this.getInitParameter("log4j_logfile_path");
System.setProperty("logfilepath", path+logFile);
if (file != null) {
//			Properties prop = new Properties();
try {
//				prop.load(new FileInputStream(path + file)); // 加载log4j.properties
// 设置日志文件的输出路径
//				prop.setProperty("log4j.appender.file.File", path + logFile + prop.getProperty("log4j.appender.file.File"));
//				prop.setProperty("log4j.appender.file_sql.File", path + logFile + prop.getProperty("log4j.appender.file_sql.File"));
// 加载配置项
//				PropertyConfigurator.configure(prop);
DOMConfigurator.configure(path + file);
super.init();
} catch (Exception e) {
logger.info("初始化log4j日志输入路径异常，请检查web.xml参数配置是否正常，异常发生在" + this.getClass().getName() + "类的public void init()方法，异常的原意是："
+ e.getMessage(), e.fillInStackTrace());
}
}
}

protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
}
}

。。。。。。。。。
<servlet>
<servlet-name>lo4jInit</servlet-name>
<servlet-class>util.Log4jInit</servlet-class>
<init-param>
<param-name>log4j_init_path</param-name>
<param-value>WEB-INF\log4j.xml</param-value>
</init-param>
<init-param>
<param-name>log4j_logfile_path</param-name>
<param-value>WEB-INF\</param-value>
</init-param>
<load-on-startup>0</load-on-startup>
</servlet>
。。。。。。。。。