自己写的java日志类和方法代码分享

import java.io.*;
import java.text.simpledateformat;
import java.util.*;
import java.util.logging.logger;

public class andylogger
{
    //the defaulted root path of sslvpn installation
    private static string rootpath = "c:\\temp2";

    //variable for creating new line
    private final static string enter = system.getproperty("line.separator");

    private static simpledateformat sdf =
        new simpledateformat("yyyy-mm-dd hh:mm:ss");

    public static synchronized void log(string filename, string logmessage)
    {
        try
        {
            file folder = new file(rootpath);
            if(!folder.exists())
            {
             folder.mkdir();
            }
            file file = new file(rootpath + "\\" + filename + ".log");
            if(!file.exists())
            {
             file.createnewfile();
            }
            bufferedreader in = new bufferedreader(new filereader(file));
            string str = "";
            string strtoal = "";

            while ((str = in.readline()) != null)
            {
                strtoal += (str + enter);
            }    
            strtoal = strtoal + (sdf.format(new date()) + " " + logmessage + enter);
            in.close();
            bufferedwriter out = new bufferedwriter(new filewriter(file));
            out.write(strtoal);
            out.close();

        }
        catch (exception e)
        {
            e.printstacktrace();
        }
    }

   
    public static synchronized void log(string filename, string[] logmessages)
    {
        try
        {
            file folder = new file(rootpath);
            if(!folder.exists())
            {
             folder.mkdir();
            }
            file file = new file(rootpath + "\\" + filename + ".log");
            if(!file.exists())
            {
             file.createnewfile();
            }
            bufferedreader in = new bufferedreader(new filereader(file));
            string str = "";
            string strtoal = "";

            while ((str = in.readline()) != null)
            {
                strtoal += (str + enter);
            }
            for (int i=0; i < logmessages.length ; i++)
            {
               string logmessage = logmessages[i];
               strtoal = strtoal + (sdf.format(new date()) + " " + logmessage + enter);
            }
            in.close();
            bufferedwriter out = new bufferedwriter(new filewriter(file));
            out.write(strtoal);
            out.close();

        }
        catch (exception e)
        {
            e.printstacktrace();
        }
    }
    public static void main(string args[])
    {
     andylogger.log("bug223", "timeisjjja");
     string[] logmessages = {"111","222","333"};
     andylogger.log("bug223", logmessages);
    }

}