Java网络编程从入门到精通（27）：关闭服务端连接
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在客户端和服务端的数据交互完成后，一般需要关闭网络连接。对于服务端来说，需要关闭Socket和ServerSocket。
在关闭Socket后，客户端并不会马上感知自已的Socket已经关闭，也就是说，在服务端的Socket关闭后，客户端的Socket的isClosed和isConnected方法仍然会分别得到false和true。但对已关闭的Socket的输入输出流进行操作会抛出一个SocketException异常。
在关闭服务端的ServerSocket后，ServerSocket对象所绑定的端口被释放。这时客户端将无法连接服务端程序。下面的代码演示了在服务端关闭Socket后，客户端是所何反应的。
<div style="border: 1px solid #cccccc; padding: 4px 5px 4px 4px; background-color: #eeeeee; font-size: 13px; width: 98%;"><!--<br /><br />Code highlighting produced by Actipro CodeHighlighter (freeware)<br />http://www.CodeHighlighter.com/<br /><br />-->package server;
importjava.net.*;
classClient
{
publicstaticvoidmain(String[]args)throwsException
{
Socketsocket=newSocket("127.0.0.1",1234);
Thread.sleep(1000);
//socket.getOutputStream().write(1);
System.out.println("read()="+socket.getInputStream().read());
System.out.println("isConnected()="+socket.isConnected());
System.out.println("isClosed()="+socket.isClosed());
}
}
publicclassCloseSocket
{
publicstaticvoidmain(String[]args)throwsException
{
ServerSocketserverSocket=newServerSocket(1234);
while(true)
{
Socketsocket=serverSocket.accept();
socket.close();
}
}
}
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