规范的流方法之复制文件代码

import java.util.ArrayList;
import java.util.Vector;
import java.util.Map;
import java.util.Hashtable;
import java.io.*;

/**
* Created by IntelliJ IDEA.
* User: Administrator
* Date: 2008-7-2
* Time: 13:40:28
* To change this template use File | Settings | File Templates.
*/
public class Newone {
    public static void main(String[] arg) throws Exception {
        Newone exam = new Newone();
        exam.dod();
    }
    public void dod()  {
        //初始化输入、输出流和缓冲流
        FileReader fr;
        FileWriter fw;
        BufferedReader in = null;
        BufferedWriter out = null;
        try{
        //源文件资源
        File source = new File("source.txt");
        //获得源文件路径（默认为C:\Documents and    Settings\Administrator\IdeaProjects\newone）
        System.out.println(source.getAbsolutePath());
        //创建复制文件名
        File copy = new File("copy.txt");
       
         fr = new FileReader(source);
        in = new BufferedReader(fr);
         fw = new FileWriter(copy);
        out = new BufferedWriter(fw);
        //进行复制运作
        String s = null;
        //循环读取每一行并且写入
        while((s = in.readLine()) != null)
            out.write( s);
       }catch (Exception eof){}
       finally{
           //必要的规范写法，确保关闭流，解放占用内存
           try {
               if(in != null)
                    in.close();
           }catch(IOException e)  {}

            try {
                if(out != null) {
                     out.close();
                }
            }catch(IOException ff) { }
       }
    }
}