Channel接口定义： http://donald-draper.iteye.com/blog/2369111
AbstractInterruptibleChannel接口定义： http://donald-draper.iteye.com/blog/2369238
SelectableChannel接口定义: http://donald-draper.iteye.com/blog/2369317
SelectionKey定义： http://donald-draper.iteye.com/blog/2369499
SelectorProvider定义： http://donald-draper.iteye.com/blog/2369615
AbstractSelectableChannel定义： http://donald-draper.iteye.com/blog/2369742
NetworkChannel接口定义： http://donald-draper.iteye.com/blog/2369773
ServerSocketChannel定义： http://donald-draper.iteye.com/blog/2369836
ServerSocketChannelImpl解析： http://donald-draper.iteye.com/blog/2370912
Selector定义： http://donald-draper.iteye.com/blog/2370015
AbstractSelector定义： http://donald-draper.iteye.com/blog/2370138
SelectorImpl分析 : http://donald-draper.iteye.com/blog/2370519
WindowsSelectorImpl解析一（FdMap，PollArrayWrapper）：
http://donald-draper.iteye.com/blog/2370811
WindowsSelectorImpl解析二（选择操作，通道注册，通道反注册，选择器关闭等）：
http://donald-draper.iteye.com/blog/2370862
SocketChannel接口定义: http://donald-draper.iteye.com/blog/2371218
SocketChannelImpl 解析一（通道连接，发送数据）： http://donald-draper.iteye.com/blog/2372364
SocketChannelImpl 解析二（发送数据后续）： http://donald-draper.iteye.com/blog/2372548
SocketChannelImpl 解析三（接收数据）： http://donald-draper.iteye.com/blog/2372590
SocketChannelImpl 解析四（关闭通道等） ： http://donald-draper.iteye.com/blog/2372717
MembershipKey定义: http://donald-draper.iteye.com/blog/2372947
MulticastChanne接口定义： http://donald-draper.iteye.com/blog/2373009
MembershipKeyImpl 简介： http://donald-draper.iteye.com/blog/2373066
DatagramChannel定义：http://donald-draper.iteye.com/blog/2373046
DatagramChannelImpl 解析一（初始化）： http://donald-draper.iteye.com/blog/2373245
DatagramChannelImpl 解析二（报文发送与接收）： http://donald-draper.iteye.com/blog/2373281
DatagramChannelImpl 解析三（多播）： http://donald-draper.iteye.com/blog/2373507
DatagramChannelImpl 解析四（地址绑定，关闭通道等）： http://donald-draper.iteye.com/blog/2373519
Java Nio从JDK1.4之后，才加入到JDK中，在JDK1.1之后，1.4之前，网络编程一般用阻塞BIO，NIO为非阻的IO，NIO主要包括Selector，Channel（Tcp:ServerSocket，Socket;
Udp:Datagram,File;Pipe:Sink，Source），Buffer，SelectionKey等相关的概念在网上有很多这里就不说了，今天文章我们用NIO写一个基于TCP的简单Server和Client。TCP在NIO主要基于ServerSocketChannel和ServerChannel，下面来看实例。
服务端：
package nio.simplesocket;
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;
/**
* Sever
* @author donald
* 2017年4月11日
* 下午9:24:03
*/
public class NIOServer {
//manager the channel
private Selector selector;
/**
* stat Server
* @param args
* @throws IOException
*/
public static void main(String[] args) throws IOException{
NIOServer server = new NIOServer();
server.initServer("192.168.32.126", 10000);
server.listen();
}
/**
* get the ServerSocket and finish some initial work
* @param port
* @throws IOException
*/
public void initServer(String host, int port) throws IOException{
//get the ServerSocket
ServerSocketChannel serverChannel = ServerSocketChannel.open();
// set no blocking mode
serverChannel.configureBlocking(false);
//bind the port
serverChannel.socket().bind(new InetSocketAddress(host, port));
//get the channel manager
this.selector = Selector.open();
//Register the channel to manager and bind the event
serverChannel.register(selector,SelectionKey.OP_ACCEPT);
}
/**
* use asking mode to listen the event of selector
* @throws IOException
*/
@SuppressWarnings("rawtypes")
public void listen() throws IOException{
System.out.println("=========The Server is start!===========");
while(true){
selector.select();
Iterator ite = this.selector.selectedKeys().iterator();
while(ite.hasNext()){
SelectionKey key = (SelectionKey)ite.next();
ite.remove();
if(key.isAcceptable()){
ServerSocketChannel server = (ServerSocketChannel)key.channel();
SocketChannel channel = server.accept();
channel.configureBlocking(false);
channel.write(ByteBuffer.wrap(new String("Hello client!").getBytes()));
channel.register(this.selector, SelectionKey.OP_READ);
}
else if (key.isReadable()) read(key);
}
}
}
/**
* deal with the message come from the client
* @param key
* @throws IOException
*/
public void read(SelectionKey key) throws IOException{
SocketChannel channel = (SocketChannel) key.channel();
ByteBuffer buf = ByteBuffer.allocate(100);
channel.read(buf);
byte[] data = buf.array();
String msg = new String(data).trim();
System.out.println("message come from client:"+msg);
}
}
客户端：
package nio.simplesocket;
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;
import java.util.Iterator;
/**
* Client
* @author donald
* 2017年4月11日
* 下午9:24:09
*/
public class NIOClient {
//manager the channel
private Selector selector;
/**
* stat Client
* @param args
* @throws IOException
*/
public static void main(String[] args) throws IOException{
NIOClient client = new NIOClient();
client.initClient("192.168.32.126",10000);
client.listen();
}
/**
* get the Socket and finish some initial work
* @param ip Server ip
* @param port connect Server port
* @throws IOException
*/
public void initClient(String ip,int port) throws IOException{
//get the Socket
SocketChannel channel = SocketChannel.open();
// set no blocking mode
channel.configureBlocking(false);
//connect the Server
channel.connect(new InetSocketAddress(ip,port));
//get the channel manager
this.selector = Selector.open();
//Register the channel to manager and bind the event
channel.register(selector,SelectionKey.OP_CONNECT);
}
/**
* use asking mode to listen the event of selector
* @throws IOException
*/
@SuppressWarnings("rawtypes")
public void listen() throws IOException{
System.out.println("===========The Client is start!===========");
while(true){
selector.select();
Iterator ite = this.selector.selectedKeys().iterator();
while(ite.hasNext()){
SelectionKey key = (SelectionKey)ite.next();
ite.remove();
if(key.isConnectable()){
SocketChannel channel = (SocketChannel)key.channel();
//during connecting, finish the connect
if(channel.isConnectionPending()){
channel.finishConnect();
}
channel.configureBlocking(false);
channel.write(ByteBuffer.wrap(new String("Hello Server!").getBytes()));
channel.register(this.selector, SelectionKey.OP_READ);
}
else if (key.isReadable()) read(key);
}
}
}
/**
* deal with the message come from the server
* @param key
* @throws IOException
*/
public void read(SelectionKey key) throws IOException{
SocketChannel channel = (SocketChannel) key.channel();
ByteBuffer buf = ByteBuffer.allocate(100);
channel.read(buf);
byte[] data = buf.array();
String msg = new String(data).trim();
System.out.println("message come from server:"+msg);
}
}
先启动NIOServer，在启动NIOClient，控制台输出：
NIOServer：
=========The Server is start!===========
message come from client:Hello Server!
NIOClient：
===========The Client is start!===========
message come from server:Hello client!
附：测试Buffer
package nio;
import java.io.UnsupportedEncodingException;
import java.nio.ByteBuffer;
/**
* 协议测试
* @author donald
* 2017年4月10日
* 下午9:26:57
*/
public class testByteBuffer {
public static void main(String[] args) {
ByteBuffer[] proctols = null;//
proctols = new ByteBuffer[2];
ByteBuffer protocolBuffer = null;//协议编码
protocolBuffer = ByteBuffer.allocate(6);
try {
System.out.println("ProtocolCode String length："+new String("300000").getBytes("UTF-8").length);
protocolBuffer.put(new String("300000").getBytes("UTF-8"));
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
System.out.println("ProtocolCode length："+protocolBuffer.position());
proctols[0] = protocolBuffer;
ByteBuffer dataBuffer = null;//操作数
dataBuffer = ByteBuffer.allocate(8);
dataBuffer.putInt(15);
dataBuffer.putInt(6);
System.out.println("data length："+dataBuffer.position());
proctols[1] = dataBuffer;
// protocolBuffer.compact();//针对数据太大，缓冲区一次装不完的情况
protocolBuffer.clear();
try {
protocolBuffer.put(new String("300100").getBytes("UTF-8"));
System.out.println("ProtocolCode length："+protocolBuffer.position());
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
// dataBuffer.compact();
dataBuffer.clear();
dataBuffer.putInt(17);
dataBuffer.putInt(8);
System.out.println("data length："+dataBuffer.position());
}
}