[英]Java tcp socket conversion to udp
目前我有这种形式的套接字的tcp版本。
final ServerSocket serverSocketConn = new ServerSocket(9000);
while (true)
{
try
{
Socket socketConn1 = serverSocketConn.accept();
new Thread(new ConnectionHandler(socketConn1)).start();
}
catch(Exception e)
{
System.out.println("MyError:Socket Accepting has been caught in main loop."+e.toString());
e.printStackTrace(System.out);
}
}
class ConnectionHandler implements Runnable {
private Socket receivedSocketConn1;
ConnectionHandler(Socket receivedSocketConn1) {
this.receivedSocketConn1=receivedSocketConn1;
}
try{
BufferedWriter bWriter = new BufferedWriter(new OutputStreamWriter(receivedSocketConn1.getOutputStream()));
BufferedReader bReader = new BufferedReader(new InputStreamReader(receivedSocketConn1.getInputStream()));
}
}
它工作正常,所以我正在将其转换为UDP。
public class commUDP9000 {
class ReceiverThread implements Runnable {
private DatagramSocket receivedSocketConn1;
ReceiverThread(DatagramSocket receivedSocketConn1) {
System.out.println("Thread Received");
this.receivedSocketConn1=receivedSocketConn1;
}
public void run(){
while (true){
try{
//
final byte[] buffer = new byte[1024];
final DatagramPacket receivePacket = new DatagramPacket(buffer, buffer.length);
receivedSocketConn1.receive(receivePacket);
String sentence = new String( receivePacket.getData());
System.out.println("RECEIVED: " + sentence);
}
catch(Exception e){
System.out.println("MyError:Socket Accepting has been caught in main loop."+e.toString());
e.printStackTrace(System.out);
}
}
}
}
public static void main(String[] args) {
new commUDP9000();
}
commUDP9000() {
try{
final DatagramSocket serverSocketConn = new DatagramSocket (9000);
new Thread(new ReceiverThread(serverSocketConn)).start();
}
catch (Exception e)
{
System.out.println("MyError:Socket Conn has been caught in main loop."+e.toString());
e.printStackTrace(System.out);
//System.exit(0);
}
}
}
我运行这个并最终结束
MyError:Socket Accepting已在主循环中捕获.java.net.BindException:地址已在使用中
您无法在UDP上创建连接,因为它是无连接的。
DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
serverSocket.receive(receivePacket);
DatagramPacket packet = new DatagramPacket(sendData, sendData.length, IPAddress, port);
serverSocket.send(sendPacket);
这里只允许发送和接收。
使用UDP,您可以做的是,将一个数据包发送到另一端。 如果您有数据包序列,则将它们视为单个数据包。 交货不保证。 每条消息的有效负载限制大约为64kbites。 理论上,但取决于你的网络MTU(可能是1500字节)。 唯一的好处是它的快速和开销是最小的。
所以你应该尽早创建一个足够的缓冲区。 如果要模拟流,则必须在Datagram之上实现自己的协议。 同样,面向连接的TCP在无连接IP协议之上实现。
你只是创建了无限的线程,所有线程都只是从同一个套接字接收。 您只需要其中一个,循环应该在其run()方法中。
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