[英]Java tcp socket conversion to udp
目前我有這種形式的套接字的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,所以我正在將其轉換為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);
}
}
}
我運行這個並最終結束
MyError:Socket Accepting已在主循環中捕獲.java.net.BindException:地址已在使用中
您無法在UDP上創建連接,因為它是無連接的。
DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
serverSocket.receive(receivePacket);
DatagramPacket packet = new DatagramPacket(sendData, sendData.length, IPAddress, port);
serverSocket.send(sendPacket);
這里只允許發送和接收。
使用UDP,您可以做的是,將一個數據包發送到另一端。 如果您有數據包序列,則將它們視為單個數據包。 交貨不保證。 每條消息的有效負載限制大約為64kbites。 理論上,但取決於你的網絡MTU(可能是1500字節)。 唯一的好處是它的快速和開銷是最小的。
所以你應該盡早創建一個足夠的緩沖區。 如果要模擬流,則必須在Datagram之上實現自己的協議。 同樣,面向連接的TCP在無連接IP協議之上實現。
你只是創建了無限的線程,所有線程都只是從同一個套接字接收。 您只需要其中一個,循環應該在其run()方法中。
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