java - 如何使用 ip 地址和端口号连接到服务器套接字？ (客户端与服务器在不同的机器上运行)

Question

客户端程序

public class client implements Runnable {

protected static String server_IP = "141.117.57.42";
private static final int server_Port = 5555 ;
protected static String client_IP ;


public static void main(String[] args) throws IOException{
    final  String host = "localhost";
    int init = 0  ;
    
    try {
        InetAddress iAddress = InetAddress.getLocalHost();
        client_IP = iAddress.getHostAddress();
        System.out.println("Current IP address : " +client_IP);
    } catch (UnknownHostException e) {
    }
    
    try {System.out.println("hello1");
        Socket socket = new Socket(server_IP,server_Port);
        System.out.println("hello3");
        init = initialize(socket);
       
    }catch (SocketException e) {
        System.out.println("Error: Unable to connect to server port ");
    }

    
    if (init ==  0 ){
        System.out.println("error: Failed to initialize ");
        System.exit(0);
        
    }
    //Thread init_Thread = new Thread();
}
private static int initialize(Socket socket ) throws IOException{
    System.out.println("hello");
    int rt_value = 0 ;
    
    OutputStream os = socket.getOutputStream();
    BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
    PrintWriter pw = new PrintWriter(os, true);
    
    System.out.println("server: " + br.readLine());
    pw.println("192.343.34.321");
   // BufferedReader userInputBR = new BufferedReader(new InputStreamReader(System.in));
    //String userInput = userInputBR.readLine();
    
    //out.println(userInput);
    
    socket.close();
    return rt_value = 1 ;
    
    
    
}
public void run(){
    
}
}

服务器端程序

public class server {

protected static String server_IP ;

public static void main(String[] args) throws IOException {
   
    
    int server_Port = 5555 ;



    try {
        InetAddress iAddress = InetAddress.getLocalHost();
        server_IP = iAddress.getHostAddress();
        System.out.println("Server IP address : " +server_IP);
    } catch (UnknownHostException e) {
    }
    
        ServerSocket serverSocket = new ServerSocket(server_Port);
    
    
        while (true) {
            Socket socket = serverSocket.accept();
            
             OutputStream os = socket.getOutputStream();
            PrintWriter pw = new PrintWriter(os, true);
            InputStreamReader isr = new InputStreamReader(socket.getInputStream());
            pw.println("Connection confirmed ");
            BufferedReader br = new BufferedReader(isr);
            String str = br.readLine();
            
            pw.println("your ip address is " + str);
            
            pw.close();
           //socket.close();

            //System.out.println("Just said hello to:" + str);
        }
    

如何使用 ip 地址和端口号连接到服务器套接字(客户端运行在与服务器不同的机器上)。

当我将客户端中的 server_IP 更改为“本地主机”时，它运行良好。

Answer 1

要连接您使用的代码:

Socket socket = new Socket(server_IP,server_Port);

所以你可以使用:

Socket socket = new Socket("192.168.1.4", 5555);

看起来你的代码中有这个，所以我不确定你遇到了什么问题。

不要忘记，如果路由器位于本地网络之外，则必须将路由器设置为转发端口。

http://www.wikihow.com/Set-Up-Port-Forwarding-on-a-Router

不要忘记，如果您正在运行防火墙，这也会干扰连接。