TimeServer:
package Server;
public class TimeServer {
public static void main(String[] args) {
int port =8080;
if(args!=null && args.length>0){
try {
port = Integer.valueOf(args[0]);
} catch (NumberFormatException e) {
// TODO: handle exception
//采用默认值
}
}
MultiplexerTimeServer timeServer = new MultiplexerTimeServer(port);
new Thread(timeServer,"NIO-MultiplexerTimeServer-001").start();
}
}
MultiplexerTimeServer:
package Server;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.Socket;
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;
import java.util.Set;
public class MultiplexerTimeServer implements Runnable {
private Selector selector;
private ServerSocketChannel servChannel;
private volatile boolean stop;
/**
* 初始化多路复用器、绑定监听端口
*
* @param port
*/
public MultiplexerTimeServer(int port) {
try {
selector = Selector.open();
servChannel = ServerSocketChannel.open();
servChannel.configureBlocking(false);
servChannel.socket().bind(new InetSocketAddress(port));
servChannel.register(selector, SelectionKey.OP_ACCEPT);
System.out.println("The time server is start in port:" + port);
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
System.exit(1);
}
}
public void stop() {
this.stop = true;
}
@Override
public void run() {
while (!stop) {
try {
selector.select(1000);
Set<SelectionKey> selectionKeys = selector.selectedKeys();
Iterator<SelectionKey> it = selectionKeys.iterator();
SelectionKey key = null;
while (it.hasNext()) {
key = it.next();
it.remove();
try {
handleInput(key);
} catch (Exception e) {
// TODO: handle exception
if (key != null) {
key.cancel();
if (key.channel() != null)
key.channel().close();
}
}
}
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
}
if (selector != null) {
try {
selector.close();
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
}
}
private void handleInput(SelectionKey key) throws IOException {
if (key.isValid()) {
// 处理新接入的请求消息
if (key.isAcceptable()) {
ServerSocketChannel ssc = (ServerSocketChannel) key.channel();
SocketChannel sc = ssc.accept();
sc.configureBlocking(false);
sc.register(selector, SelectionKey.OP_READ);
}
if (key.isReadable()) {
SocketChannel sc = (SocketChannel) key.channel();
ByteBuffer readBuffer = ByteBuffer.allocate(1024);
int readBytes = sc.read(readBuffer);
if (readBytes > 0) {
readBuffer.flip();
byte[] bytes = new byte[readBuffer.remaining()];
readBuffer.get(bytes);
String body = new String(bytes,"UTF-8");//有BUG
System.out.println("The time server receive order:" + body);
String currentTime = "QUERY TIME ORDER"
.equalsIgnoreCase(body) ? new java.util.Date(
System.currentTimeMillis()).toString():"BAD ORDER";
doWrite(sc,currentTime);
}
else if(readBytes < 0){
key.cancel();
sc.close();
}else{
;//读到0字节，忽略
}
}
}
}
private void doWrite(SocketChannel channel,String response) throws IOException
{
if(response!=null && response.trim().length() > 0)
{
byte[] bytes = response.getBytes();
ByteBuffer writeBuffer = ByteBuffer.allocate(bytes.length);
writeBuffer.put(bytes);
writeBuffer.flip();
channel.write(writeBuffer);
}
}
}
TimeClient:
package Client;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
public class TimeClient {
public static void main(String[] args) {
int port = 8080;
if (args != null && args.length > 0) {
try {
port = Integer.valueOf(args[0]);
} catch (NumberFormatException e) {
// TODO: handle exception
// 采用默认值
}
}
new Thread(new TimeClientHandle("127.0.0.1",port),"TimeClient-001").start();
}
}
TimeClientHandle:
package Client;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.ClosedChannelException;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.SocketChannel;
import java.nio.channels.WritableByteChannel;
import java.util.Iterator;
import java.util.Set;
import java.util.logging.Handler;
/**
*
* @author Administrator
*
*/
public class TimeClientHandle implements Runnable {
private String host;
private int port;
private Selector selector;
private SocketChannel socketChannel;
private volatile boolean stop;
public TimeClientHandle(String host, int port) {
this.host = host == null ? "127.0.0.1" : host;
this.port = port;
try {
selector = Selector.open();
socketChannel = SocketChannel.open();
socketChannel.configureBlocking(false);
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
System.exit(1);
}
}
/*
*
* @see java.lang.Runnable#run()
*/
@Override
public void run() {
try {
doConnect();
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
System.exit(1);
}
while (!stop) {
try {
selector.select(1000);
Set<SelectionKey> selectionKeys = selector.selectedKeys();
Iterator<SelectionKey> it = selectionKeys.iterator();
SelectionKey key = null;
while (it.hasNext()) {
key = it.next();
it.remove();
try {
handleInput(key);
} catch (Exception e) {
// TODO: handle exception
if (key != null) {
key.cancel();
if (key.channel() != null)
key.channel().close();
}
}
}
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
System.exit(1);
}
}
// 多路复用器关闭后，所有注册在上面的Channel和Pipe等资源都会被自动去注册关闭，
// 所以不需要重复释放资源
if (selector != null) {
try {
selector.close();
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
}
}
private void handleInput(SelectionKey key) throws ClosedChannelException,
IOException {
// TODO Auto-generated method stub
if (key.isValid()) {
SocketChannel sc = (SocketChannel) key.channel();
if (key.isConnectable()) {
if (sc.finishConnect()) {
sc.register(selector, SelectionKey.OP_READ);
doWrite(sc);
} else
System.exit(1);// 连接失败，进程退出
}
if (key.isReadable()) {
ByteBuffer readBuffer = ByteBuffer.allocate(1024);
int readBytes = sc.read(readBuffer);
if (readBytes > 0) {
readBuffer.flip();
byte[] bytes = new byte[readBuffer.remaining()];
readBuffer.get(bytes);
String body = new String(bytes, "UTF-8");
System.out.println("Now is :" + body);
this.stop = true;
} else if (readBytes < 0) {
key.cancel();
sc.close();
} else {
;// 读到0字节，忽略
}
}
}
}
private void doConnect() throws IOException {
// TODO Auto-generated method stub
if(socketChannel.connect(new InetSocketAddress(host,port))){
socketChannel.register(selector, SelectionKey.OP_READ);
doWrite(socketChannel);
}else {
socketChannel.register(selector, SelectionKey.OP_CONNECT);
}
}
private void doWrite(SocketChannel sc) throws IOException {
// TODO Auto-generated method stub
byte[] req = "QUERY TIME ORDER".getBytes();
ByteBuffer writeBuffer = ByteBuffer.allocate(req.length);
writeBuffer.put(req);
writeBuffer.flip();
sc.write(writeBuffer);
if(!writeBuffer.hasRemaining()){
System.out.println("Send order 2 server succeed.");
}
}
}