我正在尝试构建一个聊天程序,代码已经完成并且当我使用本地计算机并且连接到127.0.0.1时,一切运行良好。我还成功连接了我的笔记本电脑和我的计算机,在同一个路由器上运行(我使用了内部IP地址,10.0.0.3)。现在,我正试图在我的路由器和其他路由器之间建立连接。为此,我正在尝试连接到外部IP地址。我通过我的路由器进行端口转发,并设置了静态IP。然而,当我运行代码时,我总是收到“连接被拒绝”的错误信息。
以下是代码:
MainServer.java:
每次我点击上面工具中的”check”按钮时,在我的Eclipse控制台(system.out.println部分)都会收到一条消息:
我还想到,问题可能是由于我尝试从自己的路由器设备连接到自己的路由器导致的。如果有人能在他的计算机上运行Client.java,我将保持MainServer文件打开半个小时,这将非常有帮助。
以下是代码:
MainServer.java:
import java.util.*;
import java.io.*;
import java.net.*;
public class MainServer {
private ArrayList<Socket> sockets;
public MainServer() {
ServerSocket server_socket;
try {
server_socket = new ServerSocket(5005);
sockets = new ArrayList<Socket>();
System.out.println("server is now running");
while(true) {
Socket socket = server_socket.accept();
sockets.add(socket);
try {
PrintWriter writer = new PrintWriter(socket.getOutputStream());
writer.println("---you are connected to the server---\r\n");
writer.flush();
} catch(Exception e) {e.printStackTrace();}
System.out.println("server connected to " + socket.getInetAddress());
Reader reader = new Reader(socket);
Thread thread = new Thread(reader);
thread.start();
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static void main(String[] args) {
MainServer server = new MainServer();
}
class Reader implements Runnable {
Socket socket;
public Reader(Socket socket) {
this.socket=socket;
}
public void run() {
while(true) {
try {
InputStreamReader stream_reader = new InputStreamReader(socket.getInputStream());
BufferedReader reader = new BufferedReader(stream_reader);
while(true) {
String str = reader.readLine();
if(str==null)
continue;
System.out.println("message from the client " + socket.getInetAddress() + ": " + str);
send_back_message(str);
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
public void send_back_message(String str) {
try {
for(Socket send_to_socket: sockets) {
PrintWriter writer = new PrintWriter(send_to_socket.getOutputStream());
writer.println(send_to_socket.getInetAddress()+ ": " + str);
writer.flush();
}
} catch(Exception e) {e.printStackTrace();}
}
}
}
Client.java:
public Client() {
frame = new JFrame();
JPanel panel = new JPanel();
chat = new JTextArea(20,40);
chat.setEditable(false);
JScrollPane scroll = new JScrollPane(chat);
text = new JTextField(32);
JButton send = new JButton("Send");
send.addActionListener(new SendButtonListener());
panel.add(scroll);
panel.add(text);
panel.add(send);
frame.getContentPane().add(panel);
frame.setSize(500,500);
frame.setVisible(true);
try {
socket = new Socket("77.126.189.65",5005);
} catch (Exception e) {
e.printStackTrace();
}
Thread thread = new Thread(new ClientReader());
thread.start();
}
public static void main(String[] args) {
Client client = new Client();
}
class SendButtonListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
try {
PrintWriter writer = new PrintWriter(socket.getOutputStream());
writer.println(text.getText());
writer.flush();
text.setText("");
} catch (IOException e1) {
e1.printStackTrace();
}
}
}
class ClientReader implements Runnable {
public void run() {
try {
InputStreamReader stream_reader = new InputStreamReader(socket.getInputStream());
BufferedReader reader = new BufferedReader(stream_reader);
while(true) {
String str = reader.readLine();
if(str==null)
continue;
chat.setText(chat.getText() + str + "\r\n" );
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
我也尝试了这个工具。当我运行MainServer文件并使用该工具时,我得到了一个肯定的答案。我自己的Eclipse也是如此。当我的MainServer建立成功连接时,它会使用以下代码打印一条消息:
Socket socket = server_socket.accept();
System.out.println("server connected to " + socket.getInetAddress());
每次我点击上面工具中的”check”按钮时,在我的Eclipse控制台(system.out.println部分)都会收到一条消息:
因此,我认为问题可能与MainServer、端口转发/防火墙/静态IP等方面无关。server connected to /69.163.149.200
我还想到,问题可能是由于我尝试从自己的路由器设备连接到自己的路由器导致的。如果有人能在他的计算机上运行Client.java,我将保持MainServer文件打开半个小时,这将非常有帮助。