Java でアプレットを使用して簡単なテキスト チャット アプリケーションを開発しました。2 つのファイルで構成されています。
- server.java-> サーバー部分にアクセスする
- client.java-> クライアント部分にアクセスする
両方のアプレットを開いた後、サーバーとクライアントの間でチャットを行うことができます。
Here's my server side code:
Serverfile.java
import java.net.*;
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class serverfile extends JFrame {
private JTextField usertext;
private JTextArea chatwindow;
private ObjectOutputStream output;
private ObjectInputStream input;
private ServerSocket server;
private Socket connection;
public serverfile(){
super("server messaging system");
usertext= new JTextField();
usertext.setEditable(false);
usertext.addActionListener( new ActionListener(){
public void actionPerformed(ActionEvent event){
sendmessage(event.getActionCommand());
usertext.setText("");
}
}
);
add(usertext,BorderLayout.SOUTH);
chatwindow= new JTextArea();
add(new JScrollPane(chatwindow));
setSize(300,250);
setVisible(true);
}
public void startrunning(){
try{
server= new ServerSocket(6789,100);
while(true){
try{
waitForConnection();
setupstream();
whilechatting();
}catch(Exception e){
System.out.println("you have an error in coversation with client");
}finally{
closecrap();
}
}
}
catch(Exception e){
System.out.println("you have an error in connecting with client");
}
}
private void waitForConnection() throws IOException{
showmessage("waiting for someone to connect");
connection= server.accept();
showmessage("now connected to"+connection.getInetAddress().getHostName());
}
private void setupstream() throws IOException{
output= new ObjectOutputStream(connection.getOutputStream());
output.flush();
input= new ObjectInputStream(connection.getInputStream());
showmessage("\n streams are setup");
}
private void whilechatting()throws IOException{
String message = "\n you are now connected";
sendmessage(message);
ableToType(true);
do{
try{
message = (String)input.readObject();
showmessage("\n"+message);
catch(Exception e){
System.out.println("\n error in reading message");
}
}while(!message.equals("CLIENT-END"));
}
private void closecrap(){
showmessage("\nclosing connection");
ableToType(false);
try{
output.close();
input.close();
connection.close();
}catch(Exception e){
System.out.println("\n error in closing server");
}
}
private void sendmessage(String message){
try{
output.writeObject("SERVER-"+message);
output.flush();
}catch(Exception e){
chatwindow.append("\n error in sending message from server side");
}
}
private void showmessage(final String text){
SwingUtilities.invokeLater( new Runnable(){
public void run(){
chatwindow.append(text);
}
}
);
}
private void ableToType(final boolean tof){
SwingUtilities.invokeLater( new Runnable(){
public void run(){
usertext.setEditable(tof);
}
}
);
}
}
Server.java-> which access serverfile code:
import javax.swing.JFrame
public class server {
public static void main(String args[]){
serverfile obj1= new serverfile();
obj1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
obj1.startrunning();
}
}
私のクライアント側のコード:
Clientfile.java
import java.net.*;
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class clientfile extends JFrame {
private JTextField usertext;
private JTextArea chatwindow;
private ObjectOutputStream output;
private ObjectInputStream input;
private String message="";
private String serverIP;
private ServerSocket server;
private Socket connection;
public clientfile(String host){
super("client messaging system");
serverIP=host;
usertext= new JTextField();
usertext.setEditable(false);
usertext.addActionListener( new ActionListener(){
public void actionPerformed(ActionEvent event){
sendmessage(event.getActionCommand());
usertext.setText("");
}
}
);
add(usertext,BorderLayout.SOUTH);
chatwindow= new JTextArea();
add(new JScrollPane(chatwindow));
setSize(300,250);
setVisible(true);
}
public void startrunning(){
try{
connecttoserver();
setupstream();
whilechatting();
}catch(Exception e){
System.out.println("you have an error in coversation with server");
}
finally{
closecrap();
}
}
private void connecttoserver() throws IOException{
showmessage("attempting connection");
connection= new Socket(InetAddress.getByName(serverIP),6789);
showmessage("connected to"+connection.getInetAddress().getHostName());
}
private void setupstream() throws IOException{
output= new ObjectOutputStream(connection.getOutputStream());
output.flush();
input= new ObjectInputStream(connection.getInputStream());
showmessage("\n streams are good to go");
}
private void whilechatting()throws IOException{
ableToType(true);
do{
try{
message = (String)input.readObject();
showmessage("\n"+message);
}catch(Exception e){
System.out.println("\n error in writing message");
}
}while(!message.equals("SERVER - END"));
}
private void closecrap(){
showmessage("\nclosing....");
ableToType(false);
try{
output.close();
input.close();
connection.close();
}catch(Exception e){
System.out.println("\n error in closing client");
}
}
private void sendmessage(String message){
try{
output.writeObject("CLIENT-"+message);
output.flush();
}catch(Exception e){
chatwindow.append("\n error in sending message from client side");
}
}
private void showmessage(final String m){
SwingUtilities.invokeLater( new Runnable(){
public void run(){
chatwindow.append(m);
}
}
);
}
private void ableToType(final boolean tof){
SwingUtilities.invokeLater( new Runnable(){
public void run(){
usertext.setEditable(tof);
}
}
);
}
}
Client.java-> access client file code
import javax.swing.JFrame;
public class client {
public static void main(String args[]){
clientfile obj2= new clientfile("127.0.0.1");
obj2.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
obj2.startrunning();
}
}
私が知りたいのは、2 台の異なるコンピューターでチャットにアクセスする方法です。出来ますか？
あるコンピューターに server.java と別のコンピューターに client.java が必要です。どなたか解決策があれば教えてください。お気軽にご質問ください。