目錄機構如下：

package tpf.common;

import org.apache.log4j.*;

import java.io.File;
import java.net.URL;

public class Log {
    public  Logger logger;
    private  URL classpathUrl= this.getClass().getResource("/");
    public static String log4jdir;
    private  String filePath =classpathUrl.getPath()+"log4j.properties"; //
 
System.getProperty("user.dir")+"src/main/resources/log4j.properties";
    public static String loggerName = "test_log";
    
    public Log(String name){  
        loggerName = name;
        logger = Logger.getLogger(loggerName);
        log4jdir = System.getenv( "log4jdir" );
        if(log4jdir==null
 
)
            log4jdir = "testlog";
        System.setProperty("log4jdir", log4jdir); 
        PropertyConfigurator.configure(new File(filePath).getAbsolutePath());
     }
    public Log(){  
        
        logger = Logger.getLogger(loggerName);
        log4jdir = System.getenv( "log4jdir" );
        
 
if(log4jdir==null)
            log4jdir = "testlog";
        System.setProperty("log4jdir", log4jdir); 
        PropertyConfigurator.configure(filePath);
     }

     public static void main(String[] args){
        Logger log = new Log("http_log").logger;
        log.error("this is error message");
        log.debug("this is debug");
     }

    

}

java 自定義log類