无题2
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package nio; import java.io.IOException; import java.net.InetSocketAddress; import java.nio.ByteBuffer; import java.nio.channels.SocketChannel; public class SocketChannelDemo { public static void main(String[] args) { // TODO Auto-generated method stub try { SocketChannel socketChannel = SocketChannel.open(); socketChannel.connect(new InetSocketAddress("127.0.0.1", 9999)); ByteBuffer bb = ByteBuffer.allocate(48); int byteNum; int bytes = socketChannel.read(bb); bb.flip(); while (bb.hasRemaining()) { System.out.print((char) bb.get()); } bb.clear(); socketChannel.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }
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package nio; import java.io.IOException; import java.net.InetSocketAddress; import java.nio.ByteBuffer; import java.nio.channels.ServerSocketChannel; import java.nio.channels.SocketChannel; public class ServerSocketChannelDemo { public static void main(String[] args) { try { ServerSocketChannel ssc = ServerSocketChannel.open(); ssc.socket().bind(new InetSocketAddress(9999)); String msg = "send something to you"; ByteBuffer bb = ByteBuffer.allocate(48); bb.clear(); bb.put(msg.getBytes()); bb.flip(); while (true) { SocketChannel socketChannel = ssc.accept(); while (bb.hasRemaining()) { socketChannel.write(bb); } socketChannel.close(); } } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }
我一直在想为什么socket客户端只能读一次或得返回信息,原来是我server端写错了,应该把设置byteBuffer内容的这段代码写在 while循环里
如下:
while (true) { SocketChannel socketChannel = ssc.accept(); String msg = "send something to you"; ByteBuffer bb = ByteBuffer.allocate(48); bb.clear(); bb.put(msg.getBytes()); bb.flip(); while (bb.hasRemaining()) { socketChannel.write(bb); } // socketChannel.close(); }
sc.connect(new InetSocketAddress("127.0.01",9999)); //可耻的错误