程序的过程如下：
在服务器中：
-Open new window with GUI
-Start a serversocket on port 1500
-Await a client to connect
-Accept the client
-Wait to recieve their username
-Send their client number
-Start a new Thread for the client
-Store playernames, positions and the threads
在线程中：
while loop：
-Wait to Receive Object from client, where the Object is a Vector3f (float,float,float)
-Set the ArrayList of Vector3f, where the index is clientnumber, to equal the Object recieved from the client
-Send the client the arraylist
在客户端：
-Join server at specified ip
-Send username
-Recieve clientnumber
while loop：
-Send Vector3f
-recieve arraylist of Vector3f
但是......我认为这会奏效。我认为客户端会正确连接，每个客户端都会收到其他每个玩家位置的arraylist（Vector3f）。它似乎适用于连接的前4个客户端，直到：
java.util.ConcurrentModificationException
不确定如何解决这个问题......
以下是所有代码：
客户端：
package main;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.Socket;
import java.util.ArrayList;
public class Client {
private Socket socket = null;
private ObjectInputStream inStream = null;
private ObjectOutputStream outStream = null;
String name = "bob";
int port;
String ip;
Vector3f v3f = new Vector3f(0, 0, 0);
int clientnumber = 0;
int numberofclients = 0;
ArrayList<Vector3f> positions = new ArrayList<Vector3f>();
public Client(int port, String ip, String name) {
this.port = port;
this.ip = ip;
this.name = name;
startClient();
}
public void startClient() {
try {
socket = new Socket(ip, port);
System.out.println("Connected");
outStream = new ObjectOutputStream(socket.getOutputStream());//send name
outStream.writeObject(name);
inStream = new ObjectInputStream(socket.getInputStream());//recieve client number
clientnumber = (int) inStream.readObject();
while (true) {
v3f = new Vector3f(Math.random()*10+1, Math.random()*10+1, Math.random()*10+1);
outStream = new ObjectOutputStream(socket.getOutputStream());//send position
outStream.writeObject(v3f);
inStream = new ObjectInputStream(socket.getInputStream());//recieve position(s)
positions = (ArrayList<Vector3f>) inStream.readObject();
numberofclients = positions.size();
}
} catch (Exception e) {
System.err.println("Client Error: " + e.getMessage());
System.err.println("Localized: " + e.getLocalizedMessage());
System.err.println("Stack Trace: " + e.getStackTrace());
}
}
public static void main(String[] args) {
new Client(1500, "localHost", "bob");
}
}
服务器：
package main;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.URL;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
public class Server {
static JFrame f = new JFrame();
static JPanel p = new JPanel();
static JLabel info = new JLabel();
private ServerSocket serverSocket = null;
private Socket socket = null;
private boolean connection = false;
private boolean serverisrunning = true;
private int port;
static JTextArea jt = new JTextArea();
public static boolean showtimestamp = false;
private JScrollPane sc = new JScrollPane(jt,
JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
String timeStamp = new SimpleDateFormat("HH:mm:ss").format(Calendar
.getInstance().getTime());
String defaulttext = System.getProperty("user.name") + " / " + getIp()
+ " > ";
String error = "Error - ";
String badcom = " Is Not Recognised As A Valid Command";
String baduse = "Incorrect Use";
String tftext = "";
ObjectInputStream inStream = null;
ObjectOutputStream outStream = null;
JTextField tf = new JTextField("/");
static ArrayList<EchoThread> clients = new ArrayList<EchoThread>();
static ArrayList<String> clientnames = new ArrayList<String>();
static ArrayList<Vector3f> clientpos = new ArrayList<Vector3f>();
Dimension ss = Toolkit.getDefaultToolkit().getScreenSize();
public Server(int port) {
this.port = port;
f.setTitle("Server");
f.setBounds(ss.width - 750, 50, 701, 350);
f.setResizable(false);
f.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
f.setAlwaysOnTop(true);
f.setLayout(null);
f.add(p);
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent we) {
if (connection) {
try {
socket.close();
serverSocket.close();
} catch (IOException e) {
}
}
System.exit(0);
}
});
f.add(sc);
sc.setBounds(151, 0, 560, 300);
jt.setBackground(Color.BLACK);
jt.setForeground(Color.WHITE);
jt.setLineWrap(true);
jt.setEditable(false);
append("Hello World");
f.add(info);
info.setOpaque(true);
info.setBounds(0, 0, 150, 19);
info.setBackground(Color.RED);
info.setText("Clients Connected: " + clients.size());
f.add(tf);
tf.setBounds(151, 298, 544, 23);
tf.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
tftext = tf.getText();
RunCommand(tftext);
tf.setText("/");
}
});
tf.setBackground(Color.BLACK);
tf.setForeground(Color.WHITE);
f.getContentPane().setBackground(Color.BLACK);
f.setVisible(true);
startServer();
}
protected void RunCommand(String txt) {
serverMessage("'" + txt.replace("/", "") + "'\n");
if (txt.contains("/")) {
if (txt.equals("/")) {
return;
}
String t = txt.toLowerCase().replace("/", "");
if (t.contains("setshowtime")) {
if (t.endsWith(" true")) {
showtimestamp = true;
append("ShowTimeStamp - true");
} else if (t.endsWith(" false")) {
showtimestamp = false;
append("ShowTimeStamp - false");
} else {
append(error + baduse + " '" + txt + "' "
+ "\nCorrect Use: SetShowTime true/false");
}
} else if (t.contains("say ")) {
message(t.replace("say ", ""));
} else if (t.contains("hello")) {
append("Hi " + System.getProperty("user.name"));
} else if (t.contains("stop")) {
serverMessage("Server Starting\nInitialising socket connections:");
serverisrunning = false;
} else if (t.contains("kick")) {
int indexOf = t.indexOf('c');
String name = t.substring(indexOf + 2).trim();
serverMessage("Kicking Player " + name);
for (int i = 0; i < clientnames.size(); i++) {
if (clientnames.get(i).toLowerCase().contains(name)) {
append("\n'" + name + "' was found: "
+ clientnames.get(i));
p.remove(clients.get(i).clientinfo);
p.revalidate();
f.validate();
f.repaint();
clients.get(i).clientinfo.setVisible(false);
clients.remove(i);
clientnames.remove(i);
info.setText("Clients Connected: " + clients.size());
}
}
} else {// if none of the other commands
append(error + "'" + t + "'" + badcom);
}
} else {
// dunno
}
}
public void sendToAll(Object message){
for(EchoThread client : clients)
client.write(clientpos.get(clients.indexOf(client)));
}
public static void removeClient(int i) {
p.remove(clients.get(i).clientinfo);
p.revalidate();
f.validate();
f.repaint();
clients.get(i).clientinfo.setVisible(false);
clients.remove(i);
clientnames.remove(i);
clientpos.remove(i);
info.setText("Clients Connected: " + clients.size());
}
public void message(String msg) {
timeStamp = new SimpleDateFormat("HH:mm-ss").format(Calendar
.getInstance().getTime());
jt.append(" [" + timeStamp + "] " + msg);
jt.append("\n" + defaulttext);
jt.setCaretPosition(jt.getDocument().getLength());
}
public void append(String text) {
timeStamp = new SimpleDateFormat("HH:mm-ss").format(Calendar
.getInstance().getTime());
if (showtimestamp) {
jt.append(" [" + timeStamp + "] ");
}
jt.append(text);
jt.append("\n" + defaulttext);
jt.setCaretPosition(jt.getDocument().getLength());
}
public static void serverMessage(String text) {
jt.append(text);
jt.setCaretPosition(jt.getDocument().getLength());
}
public void startServer() {
try {
serverSocket = new ServerSocket(port);
append("\nPort: " + port + "\nLocal IP address: "
+ InetAddress.getLocalHost().getHostAddress()
+ "\nExternal IP address: " + getIp()
+ "\nType 'stop' to stop listening for clients...\n");
while (serverisrunning) {
if (clients.size() < 15) {
socket = serverSocket.accept();
inStream = new ObjectInputStream(socket.getInputStream());// recieve username
String name = (String) inStream.readObject();
clientnames.add(name);
System.out.println(name + " Connected");
outStream = new ObjectOutputStream(socket.getOutputStream());// send client number
outStream.writeObject(clients.size() + 1);
clientpos.add(new Vector3f());
clients.add(new EchoThread(socket));
clients.get(clients.size() - 1).start();
clients.get(clients.size() - 1).clientindex = (clients
.size());
clients.get(clients.size() - 1).clientname = clientnames
.get((clients.size() - 1));
connection = true;
timeStamp = new SimpleDateFormat("HH:mm-ss")
.format(Calendar.getInstance().getTime());
append("Client Connected: " + clients.size() + "\n"
+ clients + "\n" + "Client IP: "
+ socket.getRemoteSocketAddress() + "\n\n###### "
+ name + " Connected " + timeStamp + " ######\n");
for (int i = 0; i < clients.size(); i++) {
if (!clients.get(i).isAlive()) {
clients.remove(i);
clientnames.remove(i);
}
}
}
info.setText("Clients Connected: " + clients.size());
}
} catch (Exception e) {
}
}
public static String getIp() {
URL whatismyip;
try {
whatismyip = new URL("http://checkip.amazonaws.com");
BufferedReader in = null;
in = new BufferedReader(new InputStreamReader(
whatismyip.openStream()));
String ip = in.readLine();
if (in != null) {
in.close();
}
return ip;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
public static void main(String[] args) {
new Server(1500);
}
}
Vector3f：
package main;
import java.io.Serializable;
import javax.swing.JTextArea;
public class Vector3f implements Serializable {
public double x;
public double y;
public double z;
public Vector3f(int x, int y, int z) {
this.x = x;
this.y = y;
this.z = z;
}
public Vector3f(float x, float y, float z) {
this.x = x;
this.y = y;
this.z = z;
}
public Vector3f(double x, double y, double z) {
this.x = x;
this.y = y;
this.z = z;
}
public Vector3f() {
this.x = 0;
this.y = 0;
this.z = 0;
}
public void OutputToConsole(String additionaltext) {
System.out.println(additionaltext + " x:" + x + " y:" + y + " z:" + z);
}
public void appendToTextArea(JTextArea ta, String additionaltext) {
ta.append(additionaltext + " x:" + x + " y:" + y + " z:" + z);
}
}
EchoThread：
package main;
import java.awt.Color;
import java.awt.Font;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.Socket;
import javax.swing.JFrame;
import javax.swing.JLabel;
public class EchoThread extends Thread {
volatile boolean finished = false;
protected Socket socket;
boolean isrunning = false;
boolean edited = false;
ObjectInputStream inStream = null;
ObjectOutputStream outStream = null;
Vector3f v3f = new Vector3f(0, 0, 0);
JLabel clientinfo = new JLabel();
JFrame f;
int clientindex = 0;
String clientname = "";
int numberofclients = Server.clients.size();
public EchoThread(Socket clientSocket) {
this.socket = clientSocket;
f = Server.f;
f.add(clientinfo);
clientinfo.setOpaque(true);
clientinfo.setBounds(0, 20 + (20 * Server.clients.size()), 150, 19);
clientinfo.setBackground(Color.GREEN);
}
public void run() {
while (!finished) {
numberofclients = Server.clients.size();
try {
inStream = new ObjectInputStream(socket.getInputStream());
v3f = (Vector3f) inStream.readObject();
clientinfo.setText("[" + clientindex + "] " + clientname + ": "
+ (int) v3f.x + "," + (int) v3f.y + "," + (int) v3f.z);
FontToFit(clientinfo);
Server.clientpos.set(clientindex-1, v3f);
outStream = new ObjectOutputStream(socket.getOutputStream());
outStream.writeObject(Server.clientpos);
} catch (Exception e) {
System.out.println(e);
try {
//Server.removeClient(clientindex - 1);
end();
Server.serverMessage(clientname + " Disconnected");
socket.shutdownOutput();
inStream.close();
outStream.close();
socket.shutdownInput();
socket.close();
} catch (IOException e1) {
}
return;
}
}
}
public void write(Object obj) {
try{
outStream.writeObject(obj);
}
catch(IOException e){ e.printStackTrace(); }
}
public void end() {
finished = true;
}
public void FontToFit(JLabel label) {
Font labelFont = label.getFont();
String labelText = label.getText();
double stringWidth = label.getFontMetrics(labelFont).stringWidth(
labelText);
double componentWidth = label.getWidth();
// Find out how much the font can grow in width.
double widthRatio = (double) componentWidth / (double) stringWidth;
double newFontSize = (int) (labelFont.getSize() * widthRatio);
double componentHeight = label.getHeight();
// Pick a new font size so it will not be larger than the height of
// label.
double fontSizeToUse = Math.min(newFontSize, componentHeight);
// Set the label's font size to the newly determined size.
label.setFont(new Font(labelFont.getName(), Font.PLAIN,
(int) fontSizeToUse - 1));
}
}
答案 0 :(得分：1)
我没有查看你的代码示例，因为它有很多，但是你在标题中提到的问题答案很简短。
问：如何使用线程将一个客户端的输入广播到所有其他客户端？
答：你没有。
每个客户端使用一个线程来接收来自每个客户端的输入，当客户端C向您发送内容时，让服务客户端C的一个线程向所有客户端广播该消息其他客户端套接字。