Java 日志详解

Java 日志详解

1. Java 日志体系主要分为Facade 和具体的日志实现。当前主流的Facade主要由

• apache-comnons-logging
• slf4j
• log4j2

2. 主流的日志实现由以下几种

• java.util.logging
• log4j
• logback

3. 参考

• http://my.oschina.net/xianggao/blog/515381
• http://www.ibm.com/developerworks/cn/java/j-lo-practicelog/

4. 具体的代码
4.1 JDK自带

import java.io.IOException;
import java.io.InputStream;
import java.util.logging.Level;
import java.util.logging.LogManager;
import java.util.logging.Logger;

/**
 * Created by zhaoyu on 16-7-11.
 */
public class JdkLogging {

    private static Logger logger = null;
    private JdkLogging() {}

    public static Logger getLogger(String name) {
        InputStream stream = JdkLogging.class.getResourceAsStream("/logging.properties");
        if (logger == null) {
            try {
                LogManager.getLogManager().readConfiguration(stream);
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                try {
                    stream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            logger = Logger.getLogger(name);
        }
        return logger;
    }

    public static void main(String[] args) {
        Logger logger = JdkLogging.getLogger(JdkLogging.class.getName());
        //Logger logger = Logger.getLogger(JdkLogging.class.getName(), null);
        // logger.setLevel(Level.CONFIG);
        logger.severe("java utils logging level severe.");
        logger.warning("java utils logging level warning.");
        logger.info("java utils logging level info.");
        logger.config("java utils logging level config.");
        logger.fine("java utils logging level fine.");
        logger.finer("java utils logging level finer.");
        logger.finest("java utils logging level finest.");

    }
}

4.2 log4j

import org.apache.log4j.Logger;
import org.apache.log4j.PropertyConfigurator;
import org.apache.log4j.helpers.Loader;

/**
 * Created by zhaoyu on 16-7-11.
 */
public class Log4jLogging {

    private static final Logger LOGGER = Logger.getLogger(Log4jLogging.class);

    public static void main(String[] args) {
        LOGGER.info("this is log4j info log.");
        LOGGER.error("this is log4j error log.");

        // load log4j.properties
        //PropertyConfigurator.configure(Log4jLogging.class.getResource("/log4jx.properties"));
        PropertyConfigurator.configure(Loader.getResource("log4jx.properties"));
        if (LOGGER.isTraceEnabled()) {
            LOGGER.trace("this is log4j trace log.");
        }
    }
}

4.3 log4j2

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

/**
 * Created by zhaoyu on 16-7-11.
 */
public class Log4j2Logging {

    private static final Logger LOGGER = LogManager.getLogger(Log4j2Logging.class);

    public static void main(String[] args) {
        LOGGER.info("log4j2 info");
        LOGGER.debug("log4j2 debug");
    }
}

4.4 apache-commons-logging

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * Created by zhaoyu on 16-7-11.
 */
public class ApacheCommonsLog {

    private static final Log LOG = LogFactory.getLog(ApacheCommonsLog.class);

    public static void main(String[] args) {
        LOG.info("apache commons log.");
    }
}

4.5 logback 与slf4j

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Created by zhaoyu on 16-7-11.
 */
public class Slf4jLogging {

    private static final Logger LOGGER = LoggerFactory.getLogger(Slf4jLogging.class);

    public static void main(String[] args) {
        // logback
        LOGGER.info("logback info log");
        LOGGER.debug("logback debug log");
    }
}