問題描述：
服務端已啟動，端口9999。
客戶端通過Channel方式實現(xiàn)，功能一切正常。
客戶端通過Selector+Channel方式實現(xiàn)，程序報錯。
哪位兄臺遇到過此問題，請賜教
Exception in thread "main" java.nio.channels.NotYetConnectedException
at sun.nio.ch.SocketChannelImpl.ensureWriteOpen(SocketChannelImpl.java:269)
at sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:474)
at demo.nio.SelectorDemo.run(SelectorDemo.java:55)
at demo.nio.SelectorDemo.main(SelectorDemo.java:24)
服務端代碼：
package demo.nio;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
/**
* @ClassName: ServerSocketChannel
* @Description:
* @author
* @date 2018年1月24日 下午9:53:15
*
*/
public class ServerSocketChannelDemo implements Runnable {
public static void main(String[] args) {
ServerSocketChannelDemo serverSocketChannelDemo = new ServerSocketChannelDemo();
serverSocketChannelDemo.run();
}
public void run() {
try {
ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();
serverSocketChannel.socket().bind(new InetSocketAddress(9999));
serverSocketChannel.configureBlocking(false);
while(true){
SocketChannel socketChannel = serverSocketChannel.accept();
if(socketChannel != null){
//do something with socketChannel...
ByteBuffer buf1 = ByteBuffer.allocate(10000);
socketChannel.read(buf1);
buf1.flip();
if(buf1.hasRemaining())
System.out.println(">>>服務端收到數(shù)據(jù)："+new String(buf1.array()));
buf1.clear();
ByteBuffer buf2 = ByteBuffer.allocate(10000);
buf2.put("A word from server!".getBytes());
buf2.flip();
socketChannel.write(buf2);
socketChannel.close();
}else{
Thread.sleep(3000);
}
}
} catch (IOException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
客戶端代碼（Channel實現(xiàn)）：
package demo.nio;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.SocketChannel;
/**
* @ClassName: SocketChannelDemo
* @Description:
* @author
* @date 2018年1月11日 下午10:01:40
*
*/
public class SocketChannelDemo implements Runnable{
public static void main(String[] args) {
SocketChannelDemo socketChannelDemo = new SocketChannelDemo();
socketChannelDemo.run();
}
public void run() {
try {
//通道
SocketChannel socketChannel = SocketChannel.open();
socketChannel.connect(new InetSocketAddress("127.0.0.1", 9999));
while(!socketChannel.finishConnect()){
wait(1000);
}
//緩沖區(qū)
ByteBuffer buf1 = ByteBuffer.allocate(10000);
buf1.put("A word from client!".getBytes());
buf1.flip();
if(buf1.hasRemaining())
socketChannel.write(buf1);
buf1.clear();
ByteBuffer buf2 = ByteBuffer.allocate(10000);
socketChannel.read(buf2);
if(buf2.hasRemaining())
System.out.println(">>>客戶端接收數(shù)據(jù)："+new String(buf2.array()));
buf2.clear();
socketChannel.close();
} catch (IOException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
客戶端代碼（Selector+Channel實現(xiàn)）：
package demo.nio;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.SelectableChannel;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.util.Set;
import java.util.Iterator;
/**
* @ClassName: SelectorDemo
* @Description:
* @author
* @date 2018年1月12日 下午9:06:21
*
*/
public class SelectorDemo implements Runnable{
public static void main(String[] args) {
SelectorDemo selectorDemo = new SelectorDemo();
selectorDemo.run();
}
public void run() {
try {
//選擇器
Selector selector = Selector.open();
//通道
SocketChannel socketChannel1 = SocketChannel.open();
socketChannel1.configureBlocking(false);
SelectionKey key1 = socketChannel1.register(selector, SelectionKey.OP_CONNECT);
socketChannel1.connect(new InetSocketAddress("127.0.0.1", 9999));
while(true){
int readyChannels = selector.selectNow();//selectNow()非阻塞，select(timeout)和select()阻塞
if(readyChannels == 0)
continue;
//selector.wakeup();//第一個線程調(diào)用select后，需要執(zhí)行此方法，阻塞在select上的線程會立馬返回。
Set<?> selectedKeys = selector.selectedKeys();
Iterator<?> keyIterator = selectedKeys.iterator();
while(keyIterator.hasNext()){
SelectionKey key = (SelectionKey) keyIterator.next();
if(key.isAcceptable()){
// a connection was accepted by a ServerSocketChannel.
ServerSocketChannel socketchannel = (ServerSocketChannel) key.channel();
}else if(key.isConnectable()){
// a connection was established with a remote server.
SocketChannel socketchannel = (SocketChannel) key.channel();
ByteBuffer buf1 = ByteBuffer.allocate(10000);
buf1.put("A word from client!".getBytes());
buf1.flip();
socketchannel.write(buf1);
buf1.clear();
ByteBuffer buf2 = ByteBuffer.allocate(10000);
socketchannel.read(buf2);
buf2.flip();
System.out.println(">>>客戶端接收數(shù)據(jù)："+new String(buf2.array()));
buf2.clear();
}else if(key.isReadable()){
// a channel is ready for reading.
SelectableChannel fileChannel = key.channel();
}else if(key.isWritable()){
// a channel is ready for writing.
SelectableChannel fileChannel = key.channel();
}
keyIterator.remove();
}
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
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