[英]How do I run my client socket in seperate threads in Java?
我正在編寫一個程序來控制網絡交換機上的多個PC。 我對mulithreading不夠了解,無法理解內存的處理方式,但是如何調用infSockeThread.start();
並已連接到ip1,ip2,ip3 ..? 當我按原樣發布代碼時,它顯然只是在第二次調用它時覆蓋了InfoSocket類中的內存。 基本上,我想像運行PC一樣多次運行InfoSocket類,每台PC都有各自的唯一連接。
例如,我在主類中稱呼它為:
String[] compTestArray = {"172.16.98.6", "172.16.98.3"};
for(int i = 0; i < compTestArray.length; i++){
InfoSocket infSocket = new InfoSocket(compTestArray[i]);
Runnable infRunnable = infSocket;
Thread infSockeThread = new Thread(infRunnable);
infSockeThread.start();
}
然后我有我的套接字類:
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
public class InfoSocket implements Runnable {
protected static Socket infoSocket;
protected static PrintWriter out;
protected static BufferedReader in;
protected static String ip;
public InfoSocket(String ipaddress){
ip = ipaddress;
}
@Override
public void run() {
System.out.println("InfoSocket Thread Started");
// TODO Auto-generated method stub
String hostName = ip, fromServer = null;
int portNumber = 6000;
boolean socketConnected = false;
while (!socketConnected) {
try {
Main.textArea.append("Attempting to connect to " + hostName
+ "\n");
Thread.sleep(5000);
infoSocket = new Socket(hostName, portNumber);
out = new PrintWriter(infoSocket.getOutputStream(), true);
in = new BufferedReader(new InputStreamReader(
infoSocket.getInputStream()));
System.out.println("Connected sent to server");
// BREAK POINT
fromServer = in.readLine();
while (!fromServer.equals("connect")) {
Thread.sleep(1000);
System.out.print("Waiting for connection response from machine");
}
sendResponse(fromServer);
// Break while loop because connection was successful
socketConnected = true;
} catch (Exception e) {
e.printStackTrace();
Main.textArea.append("Connection to " + hostName
+ " failed, trying again\n");
}
}
while (socketConnected) {
System.out.println("Thread to send response sleeping");
// Sleep for a second
try {
Thread.sleep(300);
// Get info from server if available
fromServer = in.readLine();
System.out.println("From Server: " + fromServer + "\n");
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// Send response back to server based off
// of its input, only if the input is not equal to 'null'
try {
if (fromServer != null) {
System.out.println("Hit sendResponse");
sendResponse(fromServer);
}
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
public static String sendResponse(String action)
throws InterruptedException, IOException {
String str = " "; // Value to hold string to be returned
System.out.println("\nInside sendResponse");
System.out.println("Inside sendResponse & action is " + action + "\n");
switch (action) {
case "connect":
System.out.println("Inside connect");
out.println("success");
break;
case "ready":
System.out.println("Inside ready");
out.println("success");
break;
case "sync":
System.out.println("Inside sync");
Thread.sleep(10000);
out.println("success");
break;
default:
out.println(" ");
}
System.out.println("end of sendResponse");
return str;
}
}
InfoSocket
的字段不應為static
。 這就是為什么第二次調用它會覆蓋內存。 如果它們不是static
,則每個InfoSocket
實例將擁有自己的那些變量副本。
順便說一句,沒有必要寫:
Runnable infRunnable = infSocket;
一個InfoSocket
已經Runnable
。 您可以簡單地寫:
Thread infSockeThread = new Thread(infSocket);
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