log4j配置

# Set log levels #
log4j.rootLogger = DEBUG, Console, LogFile, ErrorFile

# Output the log info to the Java Console #
log4j.appender.Console = org.apache.log4j.ConsoleAppender
log4j.appender.Console.Target = System.out
log4j.appender.Console.ImmediateFlush = true
log4j.appender.Console.Threshold = DEBUG
log4j.appender.Console.layout = org.apache.log4j.PatternLayout
log4j.appender.Console.layout.ConversionPattern = <%-d{yyyy-MM-dd HH:mm:ss}> <%t> %l %n<%p> %m%n%n

# Save the log info to the log file #
log4j.appender.LogFile = org.apache.log4j.RollingFileAppender
log4j.appender.LogFile.File = logs/log.log
log4j.appender.LogFile.Append = true
log4j.appender.LogFile.ImmediateFlush = false
log4j.appender.LogFile.MaxFileSize = 8MB
log4j.appender.LogFile.MaxBackupIndex = 256
log4j.appender.LogFile.Threshold = INFO
log4j.appender.LogFile.layout = org.apache.log4j.PatternLayout
log4j.appender.LogFile.layout.ConversionPattern = <%-d{yyyy-MM-dd HH:mm:ss}> <%t> %l %n<%p> %m%n%n

# Save the error info to the error file. A file one day. #
log4j.appender.ErrorFile = org.apache.log4j.DailyRollingFileAppender
log4j.appender.ErrorFile.File = logs/error.log
log4j.appender.ErrorFile.Append = true
log4j.appender.ErrorFile.ImmediateFlush = false
log4j.appender.ErrorFile.Threshold = ERROR
log4j.appender.ErrorFile.layout = org.apache.log4j.PatternLayout
log4j.appender.ErrorFile.layout.ConversionPattern = <%-d{yyyy-MM-dd HH:mm:ss}> <%t> %l %n<%p> %m%n%n

import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

import org.apache.log4j.BasicConfigurator;
import org.apache.log4j.Level;
import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;
import org.apache.log4j.Priority;
import org.apache.log4j.PropertyConfigurator;

public class EncapsulationLog4J
{
    public static final String PROFILE = "log4j.properties";
    private static EncapsulationLog4J encapsulationLog4J;
    static
    {
        encapsulationLog4J = new EncapsulationLog4J();
    }
    private Logger log4j;
    private EncapsulationLog4J()
    {
        log4j = LogManager.getLogger(EncapsulationLog4J.class);
        Properties pro = new Properties();
        InputStream is = getClass().getResourceAsStream(PROFILE);
        try
        {
            pro.load(is);
        } catch (IOException e)
        {
            BasicConfigurator.configure();
            e.printStackTrace();
        }
        PropertyConfigurator.configure(pro);
    }

    public void log(String level,Object msg,Throwable e)
    {
        if(null!=log4j)
        {
            log4j.log((Priority)Level.toLevel(level), msg, e);
        }
    }

    public void log(String level,Object msg)
    {
        log(level,msg,null);
    }

    public void log(String level,Throwable e)
    {
        log(level,null,e);
    }

    public static EncapsulationLog4J getInstance()
    {
        return encapsulationLog4J;
    }




}

public class Log
{
    private static EncapsulationLog4J log = EncapsulationLog4J.getInstance();

    public static void logError(String msg)
    {
        log.log("ERROR", msg);
    }

    public static void logError(Throwable e)
    {
        log.log("ERROR", e);
    }

    public static void logWarn(String msg)
    {
        log.log("WARN", msg);
    }

    public static void logWarn(Throwable e)
    {
        log.log("WARN", e);
    }

    public static void logInfo(String msg)
    {
        log.log("INFO", msg);
    }

    public static void logInfo(Throwable e)
    {
        log.log("INFO", e);
    }

    public static void logDebug(String msg)
    {
        log.log("DEBUG", msg);
    }

    public static void logDebug(Throwable e)
    {
        log.log("DEBUG", e);
    }

}

public class TestLog
{

    /**
     * @param args
     */
    public static void main(String[] args)
    {
        Log.logDebug("test log debug");
        Log.logError("test Error");

    }

}

還有一種方式 配置文件log4j.properties 放在src下 

import java.net.URL;

import org.apache.log4j.BasicConfigurator;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;
import org.apache.log4j.Priority;
import org.apache.log4j.PropertyConfigurator;



public class LoggerService
{
    private Logger logger;

    public LoggerService(String  location)
    {
        logger = (Logger) Logger.getLogger(location);
        //讀取配置文件
        getLog4jConfig();
    }

    public void debug(Object msg)
    {
        log("DEBUG", msg, null);
    }

    public void debug(Object msg, Throwable t)
    {
        log("DEBUG", msg, t);
    }

    public void info(Object msg)
    {
        log("INFO", msg, null);
    }

    public void info(Object msg, Throwable t)
    {
        log("INFO", msg, t);
    }

    public void warn(Object msg)
    {
        log("WARN", msg, null);
    }

    public void warn(Object msg, Throwable t)
    {
        log("WARN", msg, t);
    }

    public void error(Object msg)
    {
        log("ERROR", msg, null);
    }

    public void error(Object msg, Throwable t)
    {
        log("ERROR", msg, t);
    }

    private void log(String level, Object msg, Throwable e)
    {
        if (null != logger)
        {
            logger.log((Priority) Level.toLevel(level), msg, e);
        }
    }

    /**
     * 讀取配置文件
     */
    private void getLog4jConfig()
    {
        if (System.getProperty("log4j.configuration") == null)
        {
            URL url = ClassLoader.getSystemResource("log4j.properties");
            String path = "";
            if(null!=url)
            {
                path = url.getPath();
            }
            PropertyConfigurator.configure(path);
            BasicConfigurator.configure();

        }
    }

}

public class Log
{


    public static LoggerService getLoggerService(String name) {
        return new LoggerService(name);
    }

}

public class TestLog
{

    public static void main(String[] args)
    {
        LoggerService log = Log.getLoggerService(TestLog.class.getName());
        log.warn("this is test logger");
    }

}

import java.io.FileInputStream;
import java.io.IOException;
import java.util.Properties;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;

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

public class Log4jInit extends HttpServlet
{
    private static final long serialVersionUID = -4499302208753939187L;
    static Logger             logger           = Logger
                                                       .getLogger(Log4jInit.class);

    public void init(ServletConfig config) throws ServletException
    {
        String prefix = config.getServletContext().getRealPath("/");
        String file = config.getInitParameter("log4j");
        String filePath = prefix + file;
        Properties props = new Properties();
        try
        {
            FileInputStream istream = new FileInputStream(filePath);
            props.load(istream);
            istream.close();
            //設置路徑
//            String logFile = prefix + props.getProperty("log4j.appender.file.File");
//            System.out.println("日誌輸出文件路徑:"+logFile);
//            props.setProperty("log4j.appender.file.File",logFile);
            // 裝入log4j配置信息
            PropertyConfigurator.configure(props);
            System.out.println("裝載完成log4j.properties:"+filePath);
        }
        catch (IOException e)
        {
            System.out.println("Could not read configuration file [" + filePath
                    + "].");
            System.out.println("Ignoring configuration file [" + filePath
                    + "].");
            return;
        }
    }
}

<servlet>
         <servlet-name>log4j-init</servlet-name>
         <servlet-class>
            com.web.serverlet.Log4jInit
         </servlet-class>
         <init-param>
           <param-name>log4j</param-name>
           <param-value>WEB-INF/classes/log4j.properties</param-value>
         </init-param>
         <load-on-startup>1</load-on-startup>
    </servlet>

• Log4J.rar (114 KB)
• 下載次數: 120