# bio
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
public class SocketServer {
public static void main(String[] args) throws Exception{
ServerSocket serverSocket = new ServerSocket(9000);
while (true) {
System.out.println("Start to accept.");
Socket socket = serverSocket.accept();
new Thread(() -> {
try {
handler(socket);
} catch (IOException e) {
e.printStackTrace();
}
}).start();
}
}
public static void handler(Socket socket) throws IOException{
byte[] bytes = new byte[1024];
int read = socket.getInputStream().read(bytes);
if (read != -1) {
System.out.println(new String(bytes, 0, read));
}
}
}
# nio
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.util.*;
public class SocketServer {
private static final Set<SocketChannel> socketChannels = new HashSet<>();
public static void main(String[] args) throws Exception{
ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();
serverSocketChannel.socket().bind(new InetSocketAddress(9000));
serverSocketChannel.configureBlocking(false);
while (true) {
SocketChannel socketChannel = serverSocketChannel.accept();
if (socketChannel != null) {
socketChannel.configureBlocking(false);
socketChannels.add(socketChannel);
}
Iterator iterator = socketChannels.iterator();
while (iterator.hasNext()) {
SocketChannel socketChannel1 = (SocketChannel) iterator.next();
ByteBuffer byteBuffer = ByteBuffer.allocate(1024);
int len = socketChannel1.read(byteBuffer);
if (len > 0) {
System.out.println(new String(byteBuffer.array()));
}
if (len == -1){
socketChannels.remove(socketChannel1);
}
}
}
}
}
1 import java.io.IOException;
2 import java.net.InetSocketAddress;
3 import java.nio.ByteBuffer;
4 import java.nio.channels.SelectionKey;
5 import java.nio.channels.Selector;
6 import java.nio.channels.ServerSocketChannel;
7 import java.nio.channels.SocketChannel;
8
9 public class NioServer {
10 public static void test() throws IOException {
11 Selector selector = Selector.open();
12
13 ServerSocketChannel ssChannel = ServerSocketChannel.open();
14 ssChannel.configureBlocking(false);
15 ssChannel.socket().bind(new InetSocketAddress(9000));
16 ssChannel.register(selector, SelectionKey.OP_ACCEPT);
17
18 while (true) {
19 if (selector.select() > 0) {
20 for (SelectionKey selectionKey : selector.selectedKeys()) {
21 if (selectionKey.isAcceptable()) {
22 ServerSocketChannel channel = (ServerSocketChannel) selectionKey.channel();
23 SocketChannel socketChannel = channel.accept();
24 socketChannel.configureBlocking(false);
25 socketChannel.register(selector, SelectionKey.OP_READ);
26 } else if (selectionKey.isReadable()) {
27 SocketChannel socketChannel = (SocketChannel) selectionKey.channel();
28 ByteBuffer byteBuffer = ByteBuffer.allocate(128);
29 int len = socketChannel.read(byteBuffer);
30
31 if (len > 0) {
32
33 System.out.println(new String(byteBuffer.array()));
34 }
35 }
36 selector.selectedKeys().remove(selectionKey);
37 }
38 }
39 }
40 }
41
42
43 public static void main(String[] args) throws IOException {
44 test();
45 }
46 }
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
public class NioServer3 {
private static final Set<SocketChannel> socketChannels = new HashSet<>();
public static void main(String[] args) throws Exception{
ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();
serverSocketChannel.socket().bind(new InetSocketAddress(9000));
serverSocketChannel.configureBlocking(false);
while (true) {
SocketChannel socketChannel = serverSocketChannel.accept();
if (socketChannel != null) {
socketChannel.configureBlocking(false);
socketChannels.add(socketChannel);
}
Iterator iterator = socketChannels.iterator();
while (iterator.hasNext()) {
SocketChannel socketChannel1 = (SocketChannel) iterator.next();
ByteBuffer byteBuffer = ByteBuffer.allocate(128);
int size = socketChannel1.read(byteBuffer);
if (size > 0) {
byte[] bytes = new byte[byteBuffer.position()];
byteBuffer.flip();
byteBuffer.get(bytes, 0, bytes.length);
System.out.println(new String(bytes));
} else if (size < 0){
socketChannels.remove(socketChannel1);
}
}
}
}
}
