java中io输入输出（复制）

package com.tjetc.practice;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

public class Test6 {

public static void main(String[] args) {
    // TODO Auto-generated method stub

        File file = new File("e:/1.txt");
        File file2 = new File("e:/2.txt");
        if(!file2.exists()){
            try {
                file2.createNewFile();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        FileInputStream fis = null;
        FileOutputStream fos = null;
        try {
            fis = new FileInputStream(file);
            fos = new FileOutputStream(file2);

            //读取数据
            byte[] buf = new byte[(int) file.length()];
            fis.read(buf);

            //写入数据
            fos.write(buf);

            System.out.println("复制完成！！！");

        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }finally{
            try {
                //关闭流
                fos.close();
                fis.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }

}

}