Java Socket长连接实现（和C通信）

TestScoket.java

单例模式实现，继承Socket

public class TestSocket
        extends Socket {
    
    private static TestSocket instance;
    
    private TestSocket() {
    }
    
    private TestSocket(String ip,int port) throws UnknownHostException, IOException{
        super(ip,port);
    }
    
    public static synchronized TestSocket getInstance(String ip,int port) throws UnknownHostException, IOException {
        if (instance == null) {
            instance = new TestSocket(ip,port);
            instance.setKeepAlive(true);　　//主要是这个参数来保持连接的
            instance.setSoTimeout(60);
        }
        return instance;
    }
}

调用代码

DdzSocket socket = DdzSocket.getInstance("127.0.0.1", "8000");
DataOutputStream dos = new DataOutputStream(socket.getOutputStream());
ByteArrayOutputStream baos = new ByteArrayOutputStream();
baos.write("发送字符串".getBytes("UTF-8"));
        
dos.write(baos.toByteArray());
dos.flush();

服务端程序可自行在网上找一个这里就不贴出来了，