log4j工具类

    log4j.properties配置文件

log4j.rootLogger=error,appender1,appender2
log4j.logger.org.test.HibernateTest.examples=error,appender1,appender2

log4j.appender.appender1=org.apache.log4j.ConsoleAppender
log4j.appender.appender1.layout=org.apache.log4j.PatternLayout    
log4j.appender.appender1.layout.ConversionPattern=[%d{yy/MM/dd HH:mm:ss:SSS}][%p][%C-%M]%m%n
  
log4j.appender.appender2=org.apache.log4j.FileAppender
log4j.appender.appender2.File=H:/demolog4j/demolog4j.log
log4j.appender.appender2.layout=org.apache.log4j.PatternLayout
log4j.appender.appender2.layout.ConversionPattern=[%d{yy/MM/dd HH:mm:ss:SSS}][%p][%C-%M]%m%n

 

    工具类LogUtil.java

import java.io.PrintWriter;
import java.io.StringWriter;
import org.apache.log4j.Logger;

public class LogUtil {
	public static void logException(Logger logger, Exception ex) {
		StringWriter trace = new StringWriter();
		ex.printStackTrace(new PrintWriter(trace));
		logger.error(trace.toString());
	}
}

 

    测试类 Test.java

import org.apache.log4j.Logger;
import org.test.HibernateTest.examples.LogUtil;

public class Test {
	private static Logger logger = Logger.getLogger(Test.class);

	public static void main(String args[]) {
		try {

		} catch (Exception ex) {
			LogUtil.logException(logger, ex);
		} finally {

		}
	}
}