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  • 正确 配置和使用 的 log4j.properties的 方法

    http://plane.javaeye.com/blog/288886

    Java代码 复制代码
    1.      
    2. # Set log levels #   
    3. log4j.rootLogger = DEBUG, Console, LogFile, ErrorFile   
    4.   
    5. # Output the log info to the Java Console #   
    6. log4j.appender.Console = org.apache.log4j.ConsoleAppender   
    7. log4j.appender.Console.Target = System.out   
    8. log4j.appender.Console.ImmediateFlush = true  
    9. log4j.appender.Console.Threshold = DEBUG   
    10. log4j.appender.Console.layout = org.apache.log4j.PatternLayout   
    11. log4j.appender.Console.layout.ConversionPattern = <%-d{yyyy-MM-dd HH:mm:ss}> <%t> %l %n<%p> %m%n%n   
    12.   
    13. # Save the log info to the log file #   
    14. log4j.appender.LogFile = org.apache.log4j.RollingFileAppender   
    15. log4j.appender.LogFile.File = logs/log.log   
    16. log4j.appender.LogFile.Append = true  
    17. log4j.appender.LogFile.ImmediateFlush = false  
    18. log4j.appender.LogFile.MaxFileSize = 8MB   
    19. log4j.appender.LogFile.MaxBackupIndex = 256  
    20. log4j.appender.LogFile.Threshold = INFO   
    21. log4j.appender.LogFile.layout = org.apache.log4j.PatternLayout   
    22. log4j.appender.LogFile.layout.ConversionPattern = <%-d{yyyy-MM-dd HH:mm:ss}> <%t> %l %n<%p> %m%n%n   
    23.   
    24. # Save the error info to the error file. A file one day. #   
    25. log4j.appender.ErrorFile = org.apache.log4j.DailyRollingFileAppender   
    26. log4j.appender.ErrorFile.File = logs/error.log   
    27. log4j.appender.ErrorFile.Append = true  
    28. log4j.appender.ErrorFile.ImmediateFlush = false  
    29. log4j.appender.ErrorFile.Threshold = ERROR   
    30. log4j.appender.ErrorFile.layout = org.apache.log4j.PatternLayout   
    31. log4j.appender.ErrorFile.layout.ConversionPattern = <%-d{yyyy-MM-dd HH:mm:ss}> <%t> %l %n<%p> %m%n%n  
      
# 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


    Java代码 复制代码
    1. import java.io.IOException;   
    2. import java.io.InputStream;   
    3. import java.util.Properties;   
    4.   
    5. import org.apache.log4j.BasicConfigurator;   
    6. import org.apache.log4j.Level;   
    7. import org.apache.log4j.LogManager;   
    8. import org.apache.log4j.Logger;   
    9. import org.apache.log4j.Priority;   
    10. import org.apache.log4j.PropertyConfigurator;   
    11.   
    12. public class EncapsulationLog4J    
    13. {   
    14.     public static final String PROFILE = "log4j.properties";   
    15.     private static EncapsulationLog4J encapsulationLog4J;   
    16.     static    
    17.     {   
    18.         encapsulationLog4J = new EncapsulationLog4J();   
    19.     }   
    20.     private Logger log4j;   
    21.     private EncapsulationLog4J()   
    22.     {   
    23.         log4j = LogManager.getLogger(EncapsulationLog4J.class);   
    24.         Properties pro = new Properties();   
    25.         InputStream is = getClass().getResourceAsStream(PROFILE);   
    26.         try    
    27.         {   
    28.             pro.load(is);   
    29.         } catch (IOException e)    
    30.         {   
    31.             BasicConfigurator.configure();   
    32.             e.printStackTrace();   
    33.         }   
    34.         PropertyConfigurator.configure(pro);   
    35.     }   
    36.        
    37.     public void log(String level,Object msg,Throwable e)   
    38.     {   
    39.         if(null!=log4j)   
    40.         {   
    41.             log4j.log((Priority)Level.toLevel(level), msg, e);   
    42.         }   
    43.     }   
    44.        
    45.     public void log(String level,Object msg)   
    46.     {   
    47.         log(level,msg,null);   
    48.     }   
    49.        
    50.     public void log(String level,Throwable e)   
    51.     {   
    52.         log(level,null,e);   
    53.     }   
    54.        
    55.     public static EncapsulationLog4J getInstance()   
    56.     {   
    57.         return encapsulationLog4J;   
    58.     }   
    59.        
    60.        
    61.        
    62.   
    63. }  
    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;
    }
    
    
	

}


    Java代码 复制代码
    1. public class Log    
    2. {   
    3.     private static EncapsulationLog4J log = EncapsulationLog4J.getInstance();   
    4.        
    5.     public static void logError(String msg)   
    6.     {   
    7.         log.log("ERROR", msg);   
    8.     }   
    9.        
    10.     public static void logError(Throwable e)   
    11.     {   
    12.         log.log("ERROR", e);   
    13.     }   
    14.        
    15.     public static void logWarn(String msg)   
    16.     {   
    17.         log.log("WARN", msg);   
    18.     }   
    19.        
    20.     public static void logWarn(Throwable e)   
    21.     {   
    22.         log.log("WARN", e);   
    23.     }   
    24.        
    25.     public static void logInfo(String msg)   
    26.     {   
    27.         log.log("INFO", msg);   
    28.     }   
    29.        
    30.     public static void logInfo(Throwable e)   
    31.     {   
    32.         log.log("INFO", e);   
    33.     }   
    34.        
    35.     public static void logDebug(String msg)   
    36.     {   
    37.         log.log("DEBUG", msg);   
    38.     }   
    39.        
    40.     public static void logDebug(Throwable e)   
    41.     {   
    42.         log.log("DEBUG", e);   
    43.     }   
    44.        
    45. }  
    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);
	}
	
}


    Java代码 复制代码
    1. public class TestLog    
    2. {   
    3.   
    4.     /**  
    5.      * @param args  
    6.      */  
    7.     public static void main(String[] args)    
    8.     {   
    9.         Log.logDebug("test log debug");   
    10.         Log.logError("test Error");   
    11.   
    12.     }   
    13.   
    14. }  
    public class TestLog 
{

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

	}

}



    还有一种方式 配置文件log4j.properties 放在src下

    Java代码 复制代码
    1. import java.net.URL;   
    2.   
    3. import org.apache.log4j.BasicConfigurator;   
    4. import org.apache.log4j.Level;   
    5. import org.apache.log4j.Logger;   
    6. import org.apache.log4j.Priority;   
    7. import org.apache.log4j.PropertyConfigurator;   
    8.   
    9.   
    10.   
    11. public class LoggerService   
    12. {   
    13.     private Logger logger;   
    14.   
    15.     public LoggerService(String  location)   
    16.     {   
    17.         logger = (Logger) Logger.getLogger(location);   
    18.         //读取配置文件   
    19.         getLog4jConfig();   
    20.     }   
    21.   
    22.     public void debug(Object msg)   
    23.     {   
    24.         log("DEBUG", msg, null);   
    25.     }   
    26.   
    27.     public void debug(Object msg, Throwable t)   
    28.     {   
    29.         log("DEBUG", msg, t);   
    30.     }   
    31.   
    32.     public void info(Object msg)   
    33.     {   
    34.         log("INFO", msg, null);   
    35.     }   
    36.   
    37.     public void info(Object msg, Throwable t)   
    38.     {   
    39.         log("INFO", msg, t);   
    40.     }   
    41.   
    42.     public void warn(Object msg)   
    43.     {   
    44.         log("WARN", msg, null);   
    45.     }   
    46.   
    47.     public void warn(Object msg, Throwable t)   
    48.     {   
    49.         log("WARN", msg, t);   
    50.     }   
    51.   
    52.     public void error(Object msg)   
    53.     {   
    54.         log("ERROR", msg, null);   
    55.     }   
    56.   
    57.     public void error(Object msg, Throwable t)   
    58.     {   
    59.         log("ERROR", msg, t);   
    60.     }   
    61.   
    62.     private void log(String level, Object msg, Throwable e)   
    63.     {   
    64.         if (null != logger)   
    65.         {   
    66.             logger.log((Priority) Level.toLevel(level), msg, e);   
    67.         }   
    68.     }   
    69.        
    70.     /**  
    71.      * 读取配置文件  
    72.      */  
    73.     private void getLog4jConfig()   
    74.     {   
    75.         if (System.getProperty("log4j.configuration") == null)   
    76.         {   
    77.             URL url = ClassLoader.getSystemResource("log4j.properties");   
    78.             String path = "";   
    79.             if(null!=url)   
    80.             {   
    81.                 path = url.getPath();   
    82.             }   
    83.             PropertyConfigurator.configure(path);   
    84.             BasicConfigurator.configure();   
    85.   
    86.         }   
    87.     }   
    88.   
    89. }  
    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);
        //读取配置文件
        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);
        }
    }
    
    /**
     * 读取配置文件
     */
    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();

        }
    }

}



    Java代码 复制代码
    1. public class Log    
    2. {   
    3.        
    4.        
    5.     public static LoggerService getLoggerService(String name) {   
    6.         return new LoggerService(name);   
    7.     }   
    8.                
    9. }  
    public class Log 
{
	
	
    public static LoggerService getLoggerService(String name) {
        return new LoggerService(name);
    }
			
}


    Java代码 复制代码
    1. public class TestLog    
    2. {   
    3.   
    4.     public static void main(String[] args)   
    5.     {   
    6.         LoggerService log = Log.getLoggerService(TestLog.class.getName());   
    7.         log.warn("this is test logger");   
    8.     }   
    9.        
    10. }  
    public class TestLog 
{

    public static void main(String[] args)
    {
        LoggerService log = Log.getLoggerService(TestLog.class.getName());
        log.warn("this is test logger");
    }
	
}
    Java代码 复制代码
    1. import java.io.FileInputStream;   
    2. import java.io.IOException;   
    3. import java.util.Properties;   
    4.   
    5. import javax.servlet.ServletConfig;   
    6. import javax.servlet.ServletException;   
    7. import javax.servlet.http.HttpServlet;   
    8.   
    9. import org.apache.log4j.Logger;   
    10. import org.apache.log4j.PropertyConfigurator;   
    11.   
    12. public class Log4jInit extends HttpServlet   
    13. {   
    14.     private static final long serialVersionUID = -4499302208753939187L;   
    15.     static Logger             logger           = Logger   
    16.                                                        .getLogger(Log4jInit.class);   
    17.   
    18.     public void init(ServletConfig config) throws ServletException   
    19.     {   
    20.         String prefix = config.getServletContext().getRealPath("/");   
    21.         String file = config.getInitParameter("log4j");   
    22.         String filePath = prefix + file;   
    23.         Properties props = new Properties();   
    24.         try  
    25.         {   
    26.             FileInputStream istream = new FileInputStream(filePath);   
    27.             props.load(istream);   
    28.             istream.close();   
    29.             //设置路径   
    30. //            String logFile = prefix + props.getProperty("log4j.appender.file.File");   
    31. //            System.out.println("日志输出文件路径:"+logFile);   
    32. //            props.setProperty("log4j.appender.file.File",logFile);   
    33.             // 装入log4j配置信息   
    34.             PropertyConfigurator.configure(props);   
    35.             System.out.println("装载完成log4j.properties:"+filePath);   
    36.         }   
    37.         catch (IOException e)   
    38.         {   
    39.             System.out.println("Could not read configuration file [" + filePath   
    40.                     + "].");   
    41.             System.out.println("Ignoring configuration file [" + filePath   
    42.                     + "].");   
    43.             return;   
    44.         }   
    45.     }   
    46. }  
    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();
            //设置路径
//            String logFile = prefix + props.getProperty("log4j.appender.file.File");
//            System.out.println("日志输出文件路径:"+logFile);
//            props.setProperty("log4j.appender.file.File",logFile);
            // 装入log4j配置信息
            PropertyConfigurator.configure(props);
            System.out.println("装载完成log4j.properties:"+filePath);
        }
        catch (IOException e)
        {
            System.out.println("Could not read configuration file [" + filePath
                    + "].");
            System.out.println("Ignoring configuration file [" + filePath
                    + "].");
            return;
        }
    }
}
    Java代码 复制代码
    1. <servlet>   
    2.          <servlet-name>log4j-init</servlet-name>   
    3.          <servlet-class>   
    4.             com.web.serverlet.Log4jInit   
    5.          </servlet-class>   
    6.          <init-param>   
    7.            <param-name>log4j</param-name>   
    8.            <param-value>WEB-INF/classes/log4j.properties</param-value>   
    9.          </init-param>   
    10.          <load-on-startup>1</load-on-startup>   
    11.     </servlet>  
    <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>
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  • 原文地址：https://www.cnblogs.com/cy163/p/1420455.html
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