java.util.logging包的学习

package sunfa.lx;

import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.logging.FileHandler;
import java.util.logging.Formatter;
import java.util.logging.Level;
import java.util.logging.LogRecord;
import java.util.logging.Logger;

/**
 * 此类就算是我在极度无聊之时对JAVA包的学习吧。虽然很多人认为java.util.logging这个包很烂。。。但是
 * 有的时候我们懒得去导log4j包，作为稀烂的轻量级的日志包，有的时候它或许还有那么点存在的价值。 就像
 * 你我他/她们虽然不能为这个世界做啥子贡献，但依然在这个世界上存在着。。。
 */
public class MyLoggerUtilDemo1 {
	public static void main(String[] args) {
		MyLoggerUtil myLogger = new MyLoggerUtil(MyLoggerUtilDemo1.class.getName(),
				"c:\\123.log");
		myLogger.info("输出日志信息");
		// myLogger.info(Level.WARNING,"11大额订单达");
		for (int i = 0; i < 5; i++) {
			myLogger.writeToFile("11:" + i);
		}
		
		//记录异常信息
		try {
			throw new NullPointerException();
		} catch (Exception e) {
			e.printStackTrace();
			myLogger.logException(e);
		}
		try {
			throw new IllegalArgumentException("抛出的异常");
		} catch (Exception e) {
			e.printStackTrace();
			myLogger.logException(e);
		}
	}
}

class MyLoggerUtil extends Formatter {
	private Logger log;
	private String path;
	private SimpleDateFormat simpleDateFormat = new SimpleDateFormat(
			"yyyy-MM-dd HH:mm:ss");

	public MyLoggerUtil(String name, String path) {
		this.log = Logger.getLogger(name);
		this.path = path;
		if (this.path != null && !this.path.equals("")) {
			try {
				FileHandler fileHandler = new FileHandler(path);
				fileHandler.setFormatter(this);
				log.addHandler(fileHandler);
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}

	public void info(Level newLevel, String msg) {
		log.setLevel(newLevel);
		log.info(msg);
	}

	public void info(String msg) {
		log.info(msg);
	}

	public void writeToFile(String msg) {
		log.info(msg);
	}

	@Override
	public String format(LogRecord record) {
		String s = record.getLevel() + ":" + getDateStr(record.getMillis())
		+ "\n\t\t" + record.getMessage()+"\n";
		if(record.getThrown()!=null){
			StackTraceElement[] stack = record.getThrown().getStackTrace();
			for (int i = 0; i < stack.length; i++) {
				s+=stack[i];
			}
		}
		return s ;
	}
	public void logException(Exception e){
		StringWriter trace = new StringWriter();
		e.printStackTrace(new PrintWriter(trace));
		log.info(trace.toString());try {
			trace.close();
		} catch (IOException e1) {
			e1.printStackTrace();
		}
	}
	private String getDateStr(long millis) {
		return simpleDateFormat.format(new Date(millis));
	}
}