我正在尝试将客户端连接到服务器，但它无法连接到服务器。当客户端启动时，我希望它等待服务器，当服务器启动时，客户端应该与它连接并开始聊天。
客户端：
import java.io.*;
import java.net.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Client extends JFrame implements Runnable {
private Thread t;
private JTextField userText;
private JTextArea chatwindow;
private ObjectOutputStream output;
private ObjectInputStream input;
private String message = "";
//ip address of the server
private String serverIp;
private Socket connection;
//give the ip address of the server to connect
public Client(String host){
super("Client");
serverIp = host;
userText = new JTextField();
userText.setEditable(false);
userText.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent event) {
// TODO Auto-generated method stub
sendMessage(event.getActionCommand());
userText.setText("");
}
});
add(userText,BorderLayout.NORTH);
chatwindow = new JTextArea();
add(new JScrollPane(chatwindow),BorderLayout.CENTER);
setSize(500,500);
setVisible(true);
}
//connect to server
public void run(){
while(true){
showMessage("attempting connection ...... ");
try {
connection = new Socket("host", 6789);
if(connection.isConnected())
break;
} catch (IOException e) {
// TODO Auto-generated catch block
}
try {
Thread.sleep(5000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
}
}
showMessage("connected ..... \n "+connection.getInetAddress().getHostName());
}
public void startRunning(){
try{
//connect to one specific server
//connectToServer();
setupStreams();
whileChatting();
}catch(EOFException eofException){
showMessage("Client terminate connection \n");
}catch(IOException ioException){
showMessage("error");
}/*finally{
closeCrap();
}*/
}
//connect to server
/*private void connectToServer() throws IOException{
//new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
while(true){
showMessage("attempting connection ...... ");
//port on the server =6789
try {
connection = new Socket("host", 6789);
Thread.sleep(50);
} catch (UnknownHostException e) {
// TODO Auto-generated catch block
//e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
//e.printStackTrace();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
//e.printStackTrace();
}
//connection = new Socket(InetAddress.getByName(serverIp),6789);
showMessage("connected ..... \n "+connection.getInetAddress().getHostName());
}
}
};
}*/
//setup streams to send and recieve message
private void setupStreams() throws IOException{
output = new ObjectOutputStream(connection.getOutputStream());
output.flush();
input = new ObjectInputStream(connection.getInputStream());
showMessage("streams are now setup");
}
//while chatting with server
private void whileChatting() throws IOException{
ableToType(true);
do{
try{
// to read whatever sent as string
message = (String)input.readObject();
showMessage("\n "+message);
}catch(ClassNotFoundException classNotFoundException){
showMessage("unknow object type");
}
}while(!message.equals("Server : END"));
}
// close the streams and sockets
private void closeCrap(){
showMessage("\n closing crap down .....");
ableToType(false);
try{
output.close();
input.close();
connection.close();
}catch(IOException ioException){
ioException.printStackTrace();
}
}
//send message to server
private void sendMessage(String message){
try{
output.writeObject("Client : "+message);
output.flush();
showMessage("\n Client : "+message);
}catch(IOException ioException){
chatwindow.append("error \n ");
}
}
//update chat window
private void showMessage(final String text){
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
chatwindow.append(text);
}
});
}
//permession to type in textbox
private void ableToType(final boolean variable){
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
userText.setEditable(variable);
}
});
}
}
服务器：
import java.io.*;
import java.net.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Server extends JFrame{
//that's the area you type your message before sent
private JTextField userText;
// the area that display tha conversation
private JTextArea chatWindow;
//build output streams
private ObjectOutputStream output;
//build input stream
private ObjectInputStream input;
private ServerSocket server;
//connection==socket
private Socket connection;
public Server(){
//add title on tha top of tha winddow
super("Server");
userText = new JTextField();
//before you connect you don't allow to type anything in the message box
userText.setEditable(false);
userText.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent event) {
// TODO Auto-generated method stub
// when user write something and hit enter that method is performed
//to send message
sendMessage(event.getActionCommand());
userText.setText("");
}
});
add(userText,BorderLayout.NORTH);
chatWindow = new JTextArea();
add(new JScrollPane(chatWindow));
setSize(500,500);
setVisible(true);
}
//setup and run the server
public void startRunning(){
try{
//port number=6789
//only a 100 people allow to hold and wait in the port
server = new ServerSocket(6789,100);
// this is the code you want to run it over and over again
while(true){
try{
//connect and have conversation
waitForConnection();
//setup tha input and output streams
setupStreams();
//send message back and forth
whileChatting();
//exception end of connection
}catch(EOFException eofException){
showMessage("error");
}finally{
closeCrap();
}
}
}catch(IOException ioException){
ioException.printStackTrace();
}
}
//wait for connection,then display connection information
private void waitForConnection(){
showMessage("wainting for some one to connect....\n");
//connection is the socket that server accept it once someone want to connect
try {
connection = server.accept();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//return the address and tha ip adress
showMessage("now connected to "+connection.getInetAddress().getHostName());
}
//get stream to send and receive date
private void setupStreams() throws IOException{
//create the path way to another computer want to connect to
output = new ObjectOutputStream(connection.getOutputStream());
output.flush();
input = new ObjectInputStream(connection.getInputStream());
showMessage(" streams are now setup");
}
//during the chat conversation
private void whileChatting() throws IOException{
String message = "You are now connected";
sendMessage(message);
// let the user type and chatting
ableToType(true);
do{
//have a conversation
try{
//read a message and make sure it a string
message = (String)input.readObject();
showMessage("\n"+message);
}catch(ClassNotFoundException classNotFoundException){
showMessage("what is that O.o wired ");
}
}while(!message.equals("Client : END"));
}
//close streams and sockets after you done chatting
private void closeCrap(){
showMessage("\n end of cpnnection ...... \n");
ableToType(false);
try{
//close the streams
output.close();
input.close();
//close the socket
connection.close();
}catch(IOException ioException){
ioException.printStackTrace();
}
}
//send a message to client
private void sendMessage(String message){
try{
//send a message throw the output stream "user name"
output.writeObject("Server : "+message);
output.flush();
showMessage("\n Server : "+message);
}catch(IOException ioException){
//put it in the chat area
chatWindow.append("\n error O.o that message can't be sent");
}
}
//update chat window
private void showMessage(final String text){
//allow to create a thread -update chat window-
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
// add a message to the chat wondow
chatWindow.append(text);
}
});
}
// allow client to type
private void ableToType(final boolean variable){
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
userText.setEditable(variable);
}
});
}
}
cientChat：
import javax.swing.JFrame;
public class CientChat {
public static void main(String[] args) {
// TODO Auto-generated method stub
//127.0.0.1 means localhost
Client testClient = new Client ("127.0.0.1");
testClient.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
testClient.run();
testClient.startRunning();
}
}
ServerChat：
import javax.swing.JFrame;
public class ServerChat {
public static void main(String[] args) {
// TODO Auto-generated method stub
Server test = new Server();
test.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
test.startRunning();
}
}
答案 0 :(得分：1)
这样：
connection = new Socket("host", 6789);
不是开始连接的正确方法，您应该尝试＆＃34; localhost＆＃34; 或ip ＆＃34; 127.0.0.1＆＃34;
尝试改为：
connection = new Socket("localhost", 6789);