package com.io;
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.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.util.Iterator;
/**
* \* Description:這裏是不允許 這個操作的。因爲SocketChannel 不允許有這個狀態
* \* Created with IntelliJ IDEA.
* \* User: fdes
* \* Date: 2018/9/5
* \* Time: 13:44
* \
*/
public class ServerNio {
private ServerSocketChannel ssc = null;
private Selector selector = null;
public static void main(String[] args) throws IOException {
ServerNio ss = new ServerNio();
ss.initServerChannel(8888);
ss.linsternServerChannel();
}
private void initServerChannel(int port) throws IOException {
ssc = ServerSocketChannel.open();
ssc.configureBlocking(false);
ssc.socket().bind(new InetSocketAddress(port));
selector = Selector.open();
ssc.register(selector,SelectionKey.OP_ACCEPT);
}
private void linsternServerChannel() throws IOException {
while (true){
this.selector.select();
Iterator<SelectionKey> iterator = this.selector.selectedKeys().iterator();
while (iterator.hasNext()){
SelectionKey key = iterator.next();
iterator.remove();
hanlder(key);
}
}
}
private void hanlder(SelectionKey key) throws IOException {
if (key.isAcceptable()){
ServerSocketChannel serverSocketChannel = (ServerSocketChannel)key.channel();
SocketChannel sc = serverSocketChannel.accept();
sc.configureBlocking(false);
sc.register(this.selector,SelectionKey.OP_READ);
} else if (key.isReadable()){
SocketChannel sc = (SocketChannel)key.channel();
ByteBuffer byteBuffers = ByteBuffer.allocate(1024);
int read = sc.read(byteBuffers);
if (read > 0){
String command = new String(byteBuffers.array(),0,read,"utf-8");
if (command.equals("re")){
System.out.println("=============re============"+command);
sc.register(this.selector,SelectionKey.OP_CONNECT);
} else if (command.equals("wirte")){
System.out.println("==========wirte==============="+command);
sc.register(this.selector,SelectionKey.OP_WRITE);
} else if (command.equals("error")){
System.out.println("==========error==============="+command);
//
sc.register(this.selector,SelectionKey.OP_ACCEPT);
} else{
System.out.println("========================="+command);
}
} else {
System.out.println("客戶端沒有數據......");
}
} else if (key.isWritable()){
System.out.println("客戶端進行寫操作......");
SocketChannel sc = (SocketChannel)key.channel();
ByteBuffer byteBuffers = ByteBuffer.allocate(1024);
byte[] bytes = "你好，客戶端1111111".getBytes();
sc.write(byteBuffers.get(bytes));
sc.register(this.selector,SelectionKey.OP_READ);
}
}
}
代碼做個筆記，方便以後複習：
1：SocketChannel （客戶端） 是不允許有 SelectionKey.OP_ACCEPT（接受就緒）狀態。
2：ServerSocketChannel 底層調用的還是ServerSocket (ssc.socket() 返回的就是)