动态创建logger，例如根据不同的ID创建不同的Log文件

LogUtil.java

import java.io.File;
import java.io.IOException;

import org.apache.log4j.Level;
import org.apache.log4j.Logger;
import org.apache.log4j.PatternLayout;
import org.apache.log4j.RollingFileAppender;

public final class LogUtils {

    private static String loggerDir = "D:/files/log";

    private static String encoding = "UTF-8";

    private static int bufferSize = 8 * 1024;

    private LogUtils() {}

    /**
     * 取得Logger对象.
     * 
     * @param name 文件名
     * @return 返回Logger对象
     * @throws IOException IOException
     * @throws FileNotFoundException FileNotFoundException
     */
    public static Logger getLogger(final String name) {
        Logger logger = Logger.getLogger(name);
        logger.removeAllAppenders();
        logger.setAdditivity(false);
        logger.setLevel(Level.DEBUG);
        PatternLayout layout = new PatternLayout();
        layout.setConversionPattern("%d{yyyy-MM-dd HH:mm:ss} [ %p ] : %m%n");
        RollingFileAppender appender;
        try {
            appender = new RollingFileAppender();
            appender.setLayout(layout);
            // Encoding must set before set file.
            appender.setEncoding(encoding);
            appender.setFile(loggerDir + File.separator + name + ".log", true, true, bufferSize);
            appender.setMaxFileSize("1MB");
            appender.setMaxBackupIndex(1);
            logger.addAppender(appender);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return logger;
    }
}