SocketChannel是NIO形式的用戶端伺服器通信的形式,支援異步非阻塞連接配接,通過管道與緩存的形式進行通信,與Java的Socket是有差別的,socket是通過請求——連接配接的形式進行通信,而SocketChannel是通過建立管道的形式進行通信,原則上,SocketChannel要比Socket快,這隻是自己的了解,不知道正确與否了。。。下面總結下SocketChannel形式的代碼實作:
一、伺服器端:
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
public class ServerSocketChannelTest {
public static void main(String[] args) throws Exception {
ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();
serverSocketChannel.socket().bind(new InetSocketAddress(9999));
while(true){
SocketChannel socketChannel = serverSocketChannel.accept();
ByteBuffer buf = ByteBuffer.allocate(48);
int bytesRead = socketChannel.read(buf);
while (bytesRead != -1) {
System.out.println("Read " + bytesRead);
buf.flip();
while(buf.hasRemaining()){
System.out.print((char) buf.get());
}
buf.clear();
bytesRead = socketChannel.read(buf);
}
}
}
}
這個阻塞的形式,也就是在serverSocketChannel.accept();處,隻有當用戶端有請求進行通道連結時,才會向下執行,下面是非阻塞形式的代碼:
ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();
serverSocketChannel.socket().bind(new InetSocketAddress(9999));
serverSocketChannel.configureBlocking(false); //設定為非阻塞式
while(true){
SocketChannel socketChannel = serverSocketChannel.accept();
if(socketChannel != null){ //為非阻塞式時,要進行非空判斷
//do something with socketChannel...
}
}
二、用戶端代碼:
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.SocketChannel;
public class SocketChannelTest {
public static void main(String[] args) throws Exception {
SocketChannel socketChannel = SocketChannel.open();
socketChannel.connect(new InetSocketAddress("localhost", 9999));
String newData = "New String to write to socket...." + System.currentTimeMillis();
ByteBuffer buf = ByteBuffer.allocate(48);
buf.clear();
buf.put(newData.getBytes());
buf.flip();
while(buf.hasRemaining()) {
socketChannel.write(buf);
}
socketChannel.close();
}
}