1. Description
Channel is an object through which data can be read and written. It can be viewed as a stream in IO. But compared with streams, it has some differences:
Channel is bidirectional and can be read or written, while streams are one-way.
Channel can be read and written asynchronously.
Channel reading and writing must go through the buffer object.
2. Example
Use channels and indirect buffers to complete.
FileInputStream fis=null; //引用
FileOutputStream fout=null;
FileChannel channel=null; //通道引用
FileChannel outchannel=null;
try {
fis = new FileInputStream("sb.jpg"); //源文件
fout = new FileOutputStream("bb.jpg"); //目标文件
channel = fis.getChannel(); //获取连接源文件的通道
outchannel = fout.getChannel(); //获取连接目标文件的通道
//指定缓冲区 非直接缓冲区
ByteBuffer buffer=ByteBuffer.allocate(1024); //创建缓冲区 用来传输数据
while(channel.read(buffer)!=-1) //从连接源文件的管道读取数据到缓冲区
{
//将缓冲区反转
buffer.flip();
outchannel.write(buffer); //将缓冲区中的数据写入连接到目标文件的管道
buffer.clear(); //"清空"缓冲区
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