[英]Socket Server accepting only one connection at a time on the same process
我正在尝试实现一个客户端服务器应用程序,其中服务器可以从客户端接受一些对象,并且对于每个对象,它必须将其解释为消息并正确处理。
这是代码:
(服务器)
public class GlobalServer{
GlobalServer(){new Thread(() ->{
try {
serverSocket = new ServerSocket(1234);
Socket clientSocket;
while (true) {
clientSocket = serverSocket.accept();
handleClient(clientSocket);
}
} catch (IOException | ClassNotFoundException e) {
e.printStackTrace();
}
}).start();
}
public void handleClient(Socket clientSocket) throws IOException, ClassNotFoundException{
ObjectInputStream is = new ObjectInputStream(clientSocket.getInputStream());
Object [] objArr = (Object[]) is.readObject();
msgHandler(objArr, clientSocket);
}
public void msgHandler(Object [] objArr, Socket clientSocket){
int msg_type = (int) objArr[0];
switch (msg_type) {
case 1:
System.out.println("type 1 received");
break;
case 2:
System.out.println("type 2 received");
break;
case 3:
System.out.println("type 3 received");
break;
default:
break;
}
}
public static void main(String [] args){
GlobalServer s = new GlobalServer();
}
}
OBS:在应用程序上,有意义的是接收对象数组,因为每个消息都带有其标头(类型)及其内容
(客户)
public class Client {
public static void main(String [] args){
try {
Socket client = new Socket("192.168.0.105", 1234);
ObjectOutputStream os = new ObjectOutputStream(client.getOutputStream());
Object [] objArr = {3, "Type 3 message"};
os.writeObject(objArr);
Object []objArr1 = {1, "Type 1 message"};
os.writeObject(objArr1);
} catch (IOException e) {
e.printStackTrace();
}
}
}
我在单独的计算机上运行GlobalServer的实例,然后在连接到服务器的另一台计算机上运行,并顺序发送两个消息。 问题在于服务器仅接收和处理第一条消息,第二条消息丢失,并且客户端完成而服务器没有收到第二条消息。 奇怪的是,如果我将这两个messagens作为两个不同的应用发送,则服务器会很好地处理它。 这与在同一过程中发送的两个消息蜂有关吗?
代码用作不同的应用程序:
(消息1)
public class Message1 {
public static void main(String [] args){
try {
Socket client = new Socket("192.168.0.105", 1234);
ObjectOutputStream os = new ObjectOutputStream(client.getOutputStream());
Object [] objArr = {3, "Type 3 message"};
os.writeObject(objArr);
} catch (IOException e) {
e.printStackTrace();
}
}
}
(消息2)
public class Message2 {
public static void main(String [] args){
try {
Socket client = new Socket("192.168.0.105", 1234);
ObjectOutputStream os = new ObjectOutputStream(client.getOutputStream());
Object []objArr1 = {1, "Type 1 message"};
os.writeObject(objArr1);
} catch (IOException e) {
e.printStackTrace();
}
}
}
问题在以下代码块中:
public void handleClient(Socket clientSocket) throws IOException, ClassNotFoundException{
ObjectInputStream is = new ObjectInputStream(clientSocket.getInputStream());
Object [] objArr = (Object[]) is.readObject();
msgHandler(objArr, clientSocket);
}
您仅读取一个对象。 (Object[]) is.readObject();
为了读取多个对象并为每个对象调用msgHandler
方法,应在循环中调用该方法。
希望这可以帮助
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