import java.io.*;

import java.text.SimpleDateFormat;

import java.util.*;

public class TestFile {

    //写文件，支持中文字符，在linux redhad下测试过

    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"));//注意需要转换对应的字符集

        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);

            //另一种读取方式

            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("中文测试看看");

        System.out.println(readLog());

    }

}