操作字节数组

package other;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;

public class ByteArrayStream {

    public static void main(String[] args) throws IOException {

        //数据源。
        ByteArrayInputStream bis = new ByteArrayInputStream("abc".getBytes());

        //数据目的
        ByteArrayOutputStream bos = new ByteArrayOutputStream();

        int by=0;
        while((by=bis.read())!=-1){
            bos.write(by);

            //写入到文件
            bos.writeTo(new FileOutputStream("a.txt"));
        }
        System.out.println(bos.size());


    }

}