对用户操作进行纪录，并写入日志

package cn.tools;

import java.io.*;
import java.util.*;
public class LogWriter {
private static final String DefalutLogFilePathName="c:/logtext.log";//默认的日志文件的路径和文件名称
private static LogWriter logwriter; //该类的唯一的实例
private static InputStream fin; //属性配置文件的输入流
private static Properties pro; //class Properties´s supper is Hashtable class
private static PrintWriter out; //output stream
private static String logFileName; //output file name
private LogWriter() {
outInit();//init out put stream,实例化PrintWriter out 对象.
}
/**保存你想保存在日志文件中的信息,实现同步
* out put the message infomation
* @param message infomation
*/
public static synchronized void log(String message) {
if (logwriter == null || (out == null)){
logwriter = new LogWriter();
}
if (out != null) {
out.println(new java.util.Date() + ":" + message);
}
}
/**把异常信息保存在日志文件中,实现同步
* out put the Excetion infomation
* @param message infomation
*/