import java.io.*;
import java.text.SimpleDateFormat;
import java.util.*;

public class TestFile {
    //寫檔案，支援中文字元，在linux redhad下測試過
    public static void writeLog(String str)
    {
        try
        {
        String path="/root/test/testfilelog.log";
        File file=new File(path);
        if(!file.exists())
            file.createNewFile();
        SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        FileOutputStream out=new FileOutputStream(file,false); //如果追加方式用true       
        StringBuffer sb=new StringBuffer();
        sb.append("-----------"+sdf.format(new Date())+"------------\n");
        sb.append(str+"\n");
        out.write(sb.toString().getBytes("utf-8"));//注意需要轉換對應的字符集
        out.close();
        }
        catch(IOException ex)
        {
            System.out.println(ex.getStackTrace());
        }
    }   
    public static String readLog()
    {
        StringBuffer sb=new StringBuffer();
        String tempstr=null;
        try
        {
            String path="/root/test/testfilelog.log";
            File file=new File(path);
            if(!file.exists())
                throw new FileNotFoundException();           
//            BufferedReader br=new BufferedReader(new FileReader(file));           
//            while((tempstr=br.readLine())!=null)
//                sb.append(tempstr);   
            //另一種讀取方式
            FileInputStream fis=new FileInputStream(file);
            BufferedReader br=new BufferedReader(new InputStreamReader(fis));
            while((tempstr=br.readLine())!=null)
                sb.append(tempstr);
        }
        catch(IOException ex)
        {
            System.out.println(ex.getStackTrace());
        }
        return sb.toString();
    }
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        writeLog("this is a test log");
        writeLog("中文測試看看");
        System.out.println(readLog());
    }

}