package jesse.test1;
import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.nio.charset.Charset;
import java.util.Iterator;
import java.util.Set;
public class NIOServer extends Thread{
@Override
public void run(){
try {
// 1，创建Selector 和 Channel
Selector selector = Selector.open();
ServerSocketChannel serverSocket = ServerSocketChannel.open();
//
serverSocket.bind(new InetSocketAddress(InetAddress.getLocalHost(), 8888));
serverSocket.configureBlocking(false);
// 注册到Selector，并说明关注点
serverSocket.register(selector, SelectionKey.OP_ACCEPT);
while(true){
//阻塞等待就绪的Channel
selector.select();
Set<SelectionKey> selectedKeys = selector.selectedKeys();
Iterator<SelectionKey> iter = selectedKeys.iterator();
while(iter.hasNext()){
SelectionKey key = iter.next();
// 生产中一般会额外进行就绪状态检查
sayHelloWorld((ServerSocketChannel) key.channel());
iter.remove();
}
}
} catch (IOException e) {
e.printStackTrace();
}
}
private void sayHelloWorld(ServerSocketChannel server){
try {
SocketChannel client = server.accept();
client.write(Charset.defaultCharset().encode("hello World."));
} catch (IOException e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
/*NIOServer server = new NIOServer();
server.start();
try {
Socket client = new Socket(InetAddress.getLocalHost(), 8888);
BufferedReader bufferReader = new BufferedReader(new InputStreamReader(client.getInputStream()));
System.out.println(bufferReader.readLine());
} catch (IOException e) {
e.printStackTrace();
}*/
System.out.println("hello world");
ThreadGroup group = Thread.currentThread().getThreadGroup();
ThreadGroup topGroup = group;
while (group != null) {
topGroup = group;
group = group.getParent();
}
int nowThreads = topGroup.activeCount();
Thread[] lstThreads = new Thread[nowThreads];
topGroup.enumerate(lstThreads);
for (int i = 0; i < nowThreads; i++) {
System.out.println("线程number：" + i + " = " + lstThreads[i].getName());
}
}
}
/**
* 1、通过Selector.open 创建Selector，类似调度员
* 2、创建一个ServerSocketChannel，并且注册到Selector上，指定SelectionKey.OP_ACCEPT,接收新的连接请求
* 3、Selector阻塞在select请求，当有Channel发生接入请求，会被唤醒
* 4、通过SocketChannel和Buffer进行数据操作，
*/
