直接上程式碼：

logger配置檔案：

log4j.rootLogger=info, CONSOLE, LOGFILE
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.CONSOLE.Encoding=UTF-8
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern=%d [%18.18t] %-5p %c - %m%n
log4j.appender.LOGFILE=com.ygz.utils.DailyRollingFileAppender

log4j.appender.LOGFILE.File=/home/sdk/YgzLogs/clear/clear.log
log4j.appender.LOGFILE.DatePattern = '.'yyyy-MM-dd-HH
log4j.appender.LOGFILE.BufferedIO=true 
log4j.appender.LOGFILE.BufferSize=512
log4j.appender.LOGFILE.Encoding=UTF-8
log4j.appender.LOGFILE.Append=true
log4j.appender.LOGFILE.layout=org.apache.log4j.PatternLayout

log4j.appender.LOGFILE.layout.ConversionPattern=%d [%18.18t] %-5p %c - %m%n

java程式碼：

package com.ygz.utils;
import java.io.File;
import java.io.IOException;
import org.apache.log4j.Layout;
import org.apache.log4j.helpers.QuietWriter;
public class DailyRollingFileAppender extends org.apache.log4j.DailyRollingFileAppender{

public DailyRollingFileAppender() {
        super();
        Runtime.getRuntime().addShutdownHook(new Thread() {
            public void run() {
            QuietWriter qw = DailyRollingFileAppender.this.getQw();
            if (qw != null) {
                    qw.flush();
                }
            }
        });  
    }
  
    public DailyRollingFileAppender(Layout layout, String filename,
            String datePattern) throws IOException {
        super(layout, filename, datePattern);
        Runtime.getRuntime().addShutdownHook(new Thread() {
            public void run() {
            QuietWriter qw = DailyRollingFileAppender.this.getQw();
            if (qw != null) {
                    qw.flush();
                }
            }
        });
    }
  
    @Override  
    public synchronized void setFile(String fileName, boolean append,
            boolean bufferedIO, int bufferSize) throws IOException {
        File logfile = new File(fileName);
        logfile.getParentFile().mkdirs();
        super.setFile(fileName, append, bufferedIO, bufferSize);
    }
  
    public QuietWriter getQw() {
        return super.qw;
    }
}