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Java Socket框架Apache MINA:实现Socket服务器端
现在用Apache MINA实现一个简单的Socket服务器端Server,服务器端实现一个简单的功能,当有Socket客户端连接过来后,发送一个简单的字符串“zhangphil”给客户端。服务器端程序代码如下:
import java.net.InetSocketAddress;
import java.nio.charset.Charset;
import org.apache.mina.core.service.IoAcceptor;
import org.apache.mina.core.service.IoHandlerAdapter;
import org.apache.mina.core.session.IdleStatus;
import org.apache.mina.core.session.IoSession;
import org.apache.mina.filter.codec.ProtocolCodecFilter;
import org.apache.mina.filter.codec.textline.TextLineCodecFactory;
import org.apache.mina.filter.logging.LoggingFilter;
import org.apache.mina.transport.socket.nio.NioSocketAcceptor;
public class MINATest {
public static void main(String[] args) {
try {
MINATest test = new MINATest();
} catch (Exception e) {
e.printStackTrace();
}
}
public MINATest() throws Exception {
IoAcceptor acceptor = new NioSocketAcceptor();
// 过滤链。
acceptor.getFilterChain().addLast("logger", new LoggingFilter());
acceptor.getFilterChain().addLast("codec",
new ProtocolCodecFilter(new TextLineCodecFactory(Charset.forName("UTF-8"))));
// 处理。
acceptor.setHandler(new SocketServerHandler());
// 服务器端绑定80端口,等待客户端连接请求。
acceptor.bind(new InetSocketAddress(80));
}
// Apache MINA的Socket服务器端。
private class SocketServerHandler extends IoHandlerAdapter {
// 会话创建。
@Override
public void sessionCreated(IoSession session) throws Exception {
super.sessionCreated(session);
System.out.println("#sessionCreated#");
}
// 会话打开时触发(第一次连接时先触发sessionCreated函数,后触发本函数)。
@Override
public void sessionOpened(IoSession session) throws Exception {
super.sessionOpened(session);
System.out.println("#sessionOpened#");
sendDataToClient(session);
}
@Override
public void messageSent(IoSession session, Object message) throws Exception {
super.messageSent(session, message);
System.out.println("#messageSent#");
System.out.println("=============");
System.out.println(message.toString());
System.out.println("=============");
}
// 接收到消息时触发。
@Override
public void messageReceived(IoSession session, Object message) throws Exception {
super.messageReceived(session, message);
// System.out.println("messageReceived");
System.out.print(message.toString());
}
@Override
public void sessionClosed(IoSession session) throws Exception {
super.sessionClosed(session);
System.out.println("\n#sessionClosed#");
}
@Override
public void sessionIdle(IoSession session, IdleStatus status) throws Exception {
super.sessionIdle(session, status);
System.out.println("#sessionIdle#");
}
@Override
public void exceptionCaught(IoSession session, Throwable cause) throws Exception {
super.exceptionCaught(session, cause);
System.out.println("#exceptionCaught#");
cause.printStackTrace();
}
}
private void sendDataToClient(IoSession session) {
String string = "zhangphil";
session.write(string);
}
}
服务器端程序运行后,当有客户端Socket连接过来,服务器端程序输出结果:
当远程连接过来的客户端突然断开连接,服务器端程序输出结果:
此时服务器端程序并未退出,当有新的客户端Socket连接过来后,服务端程序一如既往的发送数据“zhangphil”给客户端。输出如下: