文件复制

package test.com.atguigu.javase.lesson10; 

import org.junit.Test;

import java.io.*;

public class IOTestTest {

   @Test
    public void testCopyFile() throws IOException {
        //1.创建定位到hello.txt的文件的输入流
        InputStream inputStream = new FileInputStream("hello.txt");

        //2.创建定位到hello2.txt的文件的输出流
        OutputStream outputStream = new FileOutputStream("hello2.txt");

        //3.创建一个byte数组，用于读写文件
        byte[] buffer = new byte[1024 * 10];
        int len = 0;

        //4.读写文件
        while((len = inputStream.read(buffer)) != -1){
            outputStream.write(buffer,0,len);
        }

        //5.关闭流资源
        outputStream.close();
        inputStream.close();
    }
}