我正在尝试实现一个多线程套接字程序,该程序模拟五台计算机和一个控制器通过套接字相互通信。控制器具有一个服务器套接字,该套接字可以接受来自计算机的传入套接字。一旦达到系统的最大容量(比方说五个),它将使用接受传入套接字时创建的线程向这些计算机发送启动消息。
当每台计算机从控制器接收到“开始”消息时,我希望每台计算机都能够与其他计算机通信(无需依赖控制器(从计算机到控制器到计算机之间传递消息))。每台计算机实例化一个服务器套接字,以便它可以接受来自计算机的传入套接字;还实例化另一个客户端套接字,以便来自其他计算机的其他服务器套接字可以接受它。
我知道这听起来似乎很混乱,但是基本上我想在每个客户端程序(计算机)上使用服务器套接字,以便它可以在不依赖控制器的情况下侦听其他客户端(计算机)。
这可能吗?我可以实例化服务器程序套接字的每个客户端程序(计算机),以便它可以侦听其他计算机吗?它是否需要与控制器的服务器插槽不同的IP地址和/或端口号?我是否需要为x数量的计算机实例化x数量的套接字?
也许我的Java代码可以解决这个问题。
Controller.java
package timetableexchange;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.ArrayList;
public class Controller {
final int MAX_SYSTEMS = 2;
static ArrayList<ServerConnection> conns = new ArrayList<ServerConnection>(); // connections to computer
static int finishedCount = 0; // number of finished computers
ServerSocket ss; // server socket
public static void main(String[] args) throws IOException {
// Instantiate controller
new Controller(8000);
}
public Controller(int port) throws IOException {
// Instantiate server socket
ss = new ServerSocket(8000);
int i = 0;
// Listen and accept clients (1 for testing)
while (i < MAX_SYSTEMS) {
Socket s = ss.accept();
// add to list
ServerConnection conn = new ServerConnection(i++, s);
conns.add(conn);
}
// start server connection thread
for (i = 0; i < conns.size(); ++i) {
conns.get(i).start();
}
ss.close();
}
// Thread for communicating between controller and computer
private class ServerConnection extends Thread {
Socket socket;
BufferedReader in;
PrintWriter out;
int identifier;
// constructor
public ServerConnection(int i, Socket s) throws IOException {
this.identifier = i;
this.socket = s;
this.in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
this.out = new PrintWriter(socket.getOutputStream(), true);
System.out.println("Client Connected");
}
@Override
public void run() {
System.out.println("ServerConnection started");
// send ID to computers
sendAll(identifier + "");
// send Start message to computers
sendAll("Start");
// Check if a computer sent back a Finish message
// If all computers are finished, then send out Tear Down message.
while (true) {
try {
String clientInput = in.readLine();
if (clientInput.equals("Finish")) {
finishedCount += 1;
if (finishedCount == conns.size()) {
sendAll("Tear Down");
}
}
} catch (IOException e) {
e.printStackTrace();
break;
}
}
}
private void sendAll(String text) {
for (int i = 0; i < conns.size(); ++i) {
ServerConnection conn = conns.get(i);
conn.out.println(text);
}
}
}
}
Computer.java
package timetableexchange;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.ArrayList;
import java.util.Vector;
public class Computer {
final int MAX_SYSTEMS = 2;
int identifier; // Computer ID
int eventCount; // Number of Generated Events
ArrayList<Socket> sockets = new ArrayList<Socket>(); // List of (client) sockets
Vector<Integer> timestamp = new Vector<Integer>(); // Time-stamp vector
Socket socketToServer; // Socket to Connect to Controller
BufferedReader inputFromServer; // Input Stream from Controller
PrintWriter outputToServer; // Output Stream to Controller
String textFromServer; // String sent from Controller
ServerSocket ss; // Server Socket to communicate with other clients (computers)
Socket socketToClient; // Socket to Connect to Computer
BufferedReader inputFromClient; // Input Stream from Computer
PrintWriter outputToClient; // Output Stream to Computer
public static void main(String[] args) throws IOException {
// Instantiate Computer
new Computer("127.0.0.1", 8000);
}
// Constructor
public Computer(String hostname, int port) throws IOException {
// Instantiate Socket (to Controller) and Streams (to Controller)
socketToServer = new Socket(hostname, port);
inputFromServer = new BufferedReader(new InputStreamReader(socketToServer.getInputStream()));
outputToServer = new PrintWriter(socketToServer.getOutputStream(), true);
// Check if Controller sent the computer its ID
while (true) {
try {
textFromServer = inputFromServer.readLine();
// set identifier
identifier = Integer.parseInt(textFromServer);
System.out.println(identifier);
break; // break loop
} catch (NumberFormatException e) {
e.printStackTrace();
}
}
// Check if Controller sent the start message
while (true) {
textFromServer = inputFromServer.readLine();
if (textFromServer.equals("Start"))
System.out.println("Start message received");
break; // break loop
}
// Instantiate Server Socket (for Clients)
ss = new ServerSocket(port + identifier + 1);
// Instantiate Client Socket for Other Clients to Hear
socketToClient = new Socket();
inputFromClient = new BufferedReader(new InputStreamReader(socketToClient.getInputStream()));
outputToClient = new PrintWriter(socketToClient.getOutputStream());
// listen to server socket and add accepted socket to list
for (int i = 0; i < MAX_SYSTEMS - 1; ++i) {
Socket s = ss.accept();
System.out.println("Client accepted");
sockets.add(s);
}
Thread readEvent = new Thread(new Runnable() {
@Override
public void run() {
/**
* Read from input stream
* Read the vector inside the input stream
* Compare vectors and choose the largest integer (synchronized)
* Add 1 to the corresponding socket. (synchronized)
*/
}
});
Thread writeEvent = new Thread(new Runnable() {
@Override
public void run() {
/**
* Generate random number between 0 and 4.
* If zero, then add 1 to its own socket in vector.
* Else, send vector to random socket via output stream
*/
}
});
readEvent.start();
writeEvent.start();
}
}
感谢您的帮助!
答案 0 :(得分:0)
简而言之:
这可能吗?
是-为什么不呢?
我可以实例化每个客户端程序(计算机)服务器套接字吗,这样 可以听其他电脑吗?
是的-您可以执行所需的任何操作
是否需要与IP地址不同的IP地址和/或端口号? 控制器的服务器套接字?
IP地址属于“物理计算机” /混合工作接口,与您要尝试执行的操作无关紧要-所有IP地址都可以在一台计算机上运行,并且都可以在同一IP地址上运行(例如127.0.0.1)。您必须为要打开的每个服务器套接字都具有专用端口,并且客户端套接字必须知道要与之通信的IP和端口号。 对于客户端套接字,您无需关心IP或端口号。
我是否需要实例化x个数量的套接字? 电脑?
问题对我来说意义不大-这是您的设计决策,需要实例化多少个服务器套接字-一个端口一个服务器套接字就可以了。