public class StreamDemo2 {
public static void main(String[] args) {
try {
BufferedInputStream bis = new BufferedInputStream(
new FileInputStream("D:\\javalessons\\coreJava\\javaSE-core\\a.jpg"));
BufferedOutputStream bos = new BufferedOutputStream(
new FileOutputStream("D:\\javalessons\\coreJava\\javaSE-core\\d.jpg"));
// FileOutputStream bos=
// new FileOutputStream("D:\\javalessons\\coreJava\\javaSE-core\\e.jpg");
/*
* 内部操作会下把文件放置到内存中（缓冲区字节数组)
* 我们读的时候从内存中读取
*/
byte[] b = new byte[10000];
int bytes;
while((bytes = bis.read(b,0,b.length))!=-1){
//先写入缓冲区，刷新缓冲区才会写入磁盘 缓冲区满了自动刷新
bos.write(b,0,bytes);
bos.flush();
}
bos.close();//close也会自动刷新
bis.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
原文：http://www.cnblogs.com/shaoshanhuo/p/5155106.html