java复制一个文本文件

import java.io.*;

public class readline
{

    public static void main(String[] args) throws Exception
    {
        File file1 = new File("/root/temp.txt");
        File file2 = new File("/root/temp2.txt");
        
        BufferedReader reader = new BufferedReader(new FileReader(file1));
        BufferedWriter writer = new BufferedWriter(new FileWriter(file2));
        
        while (true)
        {
            String str;
            if ((str = reader.readLine()) != null)
            {
                writer.write(str);
                writer.newLine();
            }
            else
            {
                System.out.println("file end");
                break;
            }
        }
        
        reader.close();
        writer.close();
    }
}