15.3.2 OutputStream和Writer

import java.io.FileInputStream;
import java.io.FileOutputStream;

public class FileOutputStreamTest {

	public static void main(String[] args) {
		try {
			//创建字节输入流
			FileInputStream fis=new FileInputStream("abc.txt");
			//创建字节输出流
			FileOutputStream fos=new FileOutputStream("newfile.txt");
			{
				byte[] bbuf=new byte[32];
				int hasRead=0;
				//循环从输入流中取出数据
				while((hasRead=fis.read(bbuf))>0)
				{
					//每读取一次，即写入文件输出流，读了多少，就写多少
					fos.write(bbuf, 0, hasRead);
				}
			}
		} catch (Exception e) {
			e.printStackTrace();
		}

	}

}