带有服务器和 UI 的 Knock Knock 应用程序 [英] Knock Knock application with server and UI
本文介绍了带有服务器和 UI 的 Knock Knock 应用程序的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在创建一个简单的 Knock Knock 应用程序(套接字编程)，其中有一个本地主机服务器和一个客户端.该程序很简单，服务器会告诉敲门笑话，这就是它应该如何进行的，
I am creating a simple Knock Knock application (socket programming) where there is a localhost server and there is a client.the program is simple, the server will tell the knock knock jokes, this is how it's supposed to go,
Server: Knock Knock
Client: Who's there?
Server: Turnip.
Client: Turnip Who?
Server: Turnip the heat.
这就是程序应该运行的方式.但问题是我的 GUI 没有显示任何消息.在我的文本区域.这是我的代码.
So that's how the program supposed to go. but the thing is my GUI doesn't show any messages. on my Text area. Here are my codes.
服务器:
import java.net.*;
import java.io.*;
public class KnockKnockServer {
public static void main(String[] args) throws IOException {
ServerSocket serverSocket = null;
try {
serverSocket = new ServerSocket(4444);
} catch (IOException e) {
System.err.println("Could not listen on port: 4444.");
System.exit(1);
}
Socket clientSocket = null;
try {
clientSocket = serverSocket.accept();
} catch (IOException e) {
System.err.println("Accept failed.");
System.exit(1);
}
PrintWriter out = new PrintWriter(clientSocket.getOutputStream(), true);
BufferedReader in = new BufferedReader(
new InputStreamReader(
clientSocket.getInputStream()));
String inputLine, outputLine;
KnockKnockProtocol kkp = new KnockKnockProtocol();
outputLine = kkp.processInput(null);
out.println(outputLine);
while ((inputLine = in.readLine()) != null) {
outputLine = kkp.processInput(inputLine);
out.println(outputLine);
if (outputLine.equals("Bye."))
break;
}
out.close();
in.close();
clientSocket.close();
serverSocket.close();
}
}
KnockKnock 协议
The KnockKnockProtocol
import java.net.*;
import java.io.*;
public class KnockKnockProtocol {
private static final int WAITING = 0;
private static final int SENTKNOCKKNOCK = 1;
private static final int SENTCLUE = 2;
private static final int ANOTHER = 3;
private static final int NUMJOKES = 5;
private int state = WAITING;
private int currentJoke = 0;
private String[] clues = { "Turnip", "Little Old Lady", "Atch", "Who", "Who" };
private String[] answers = { "Turnip the heat, it's cold in here!",
"I didn't know you could yodel!",
"Bless you!",
"Is there an owl in here?",
"Is there an echo in here?" };
public String processInput(String theInput) {
String theOutput = null;
if (state == WAITING) {
theOutput = "Knock! Knock!";
state = SENTKNOCKKNOCK;
} else if (state == SENTKNOCKKNOCK) {
if (theInput.equalsIgnoreCase("Who's there?")) {
theOutput = clues[currentJoke];
state = SENTCLUE;
} else {
theOutput = "You're supposed to say "Who's there?"! " +
"Try again. Knock! Knock!";
}
} else if (state == SENTCLUE) {
if (theInput.equalsIgnoreCase(clues[currentJoke] + " who?")) {
theOutput = answers[currentJoke] + " Want another? (y/n)";
state = ANOTHER;
} else {
theOutput = "You're supposed to say "" +
clues[currentJoke] +
" who?"" +
"! Try again. Knock! Knock!";
state = SENTKNOCKKNOCK;
}
} else if (state == ANOTHER) {
if (theInput.equalsIgnoreCase("y")) {
theOutput = "Knock! Knock!";
if (currentJoke == (NUMJOKES - 1))
currentJoke = 0;
else
currentJoke++;
state = SENTKNOCKKNOCK;
} else {
theOutput = "Bye.";
state = WAITING;
}
}
return theOutput;
}
}
客户.
import java.io.*;
import java.net.*;
public class KnockKnockClient {
public String fromServer;
public String fromUser;
public void Client() throws IOException {
Socket kkSocket = null;
PrintWriter out = null;
BufferedReader in = null;
try {
kkSocket = new Socket("127.0.0.1", 4444);
out = new PrintWriter(kkSocket.getOutputStream(), true);
in = new BufferedReader(new InputStreamReader(kkSocket.getInputStream()));
} catch (UnknownHostException e) {
System.err.println("Don't know about host: 127.0.0.1");
System.exit(1);
} catch (IOException e) {
System.err.println("Couldn't get I/O for the connection to: 127.0.0.1");
System.exit(1);
}
BufferedReader stdIn = new BufferedReader(new InputStreamReader(System.in));
while ((fromServer = in.readLine()) != null) {
System.out.println("Server: " + fromServer);
if (fromServer.equals("Bye."))
break;
fromUser = stdIn.readLine();
if (fromUser != null) {
System.out.println("Client: " + fromUser);
out.println(fromUser);
}
}
out.close();
in.close();
stdIn.close();
kkSocket.close();
}
}
和用户界面
import java.awt.event.ActionListener;
public class KnockKnockWindow extends JFrame {
JTextArea clientTextArea;
JTextArea serverTextArea;
JButton submitButton;
public KnockKnockWindow() {
super("Chat Window");
setVisible(true);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setLocationRelativeTo(null);
setSize(420,228);
getContentPane().setLayout(null);
clientTextArea = new JTextArea();
clientTextArea.setBounds(10, 118, 278, 51);
getContentPane().add(clientTextArea);
serverTextArea = new JTextArea();
serverTextArea.setBounds(10, 11, 278, 96);
getContentPane().add(serverTextArea);
submitButton = new JButton("Submit");
submitButton.setBounds(298, 118, 89, 51);
getContentPane().add(submitButton);
}
public void setServerText(String fromServer){
serverTextArea.setText(fromServer);
}
public void setClientText(String fromClient){
clientTextArea.setText(fromClient);
}
public String returnClientText(){
return clientTextArea.getText();
}
public void addSubmitListener(ActionListener sub){
submitButton.addActionListener(sub);
}
}
The Controller
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class KnockKnockController {
private KnockKnockClient client;
private KnockKnockWindow window;
public KnockKnockController(KnockKnockClient client, KnockKnockWindow window){
this.client = client;
this.window = window;
window.addSubmitListener(new SubmitListener());
window.setServerText(client.fromServer);
}
public class SubmitListener implements ActionListener{
public void actionPerformed(ActionEvent arg0) {
client.fromUser = window.returnClientText();
}
}
}
和主要应用
import javax.swing.JFrame;
public class KnockTest extends JFrame{
public static void main (String[] args){
KnockKnockClient kkcl = new KnockKnockClient();
KnockKnockWindow kkw = new KnockKnockWindow();
KnockKnockController kkc = new KnockKnockController(kkcl,kkw);
}
}
我们将首先运行服务器，然后是主.
We will run the server first, then the main.
但是为什么我没有收到来自服务器的任何消息?当我点击开始.服务器的文本区域应显示 KnockKnock.但它似乎没有显示，知道吗?对不起，代码太长了，但我不知道在这里缩短它们.因为我知道它们中的大多数都很重要
But why is it that I am not receiving any messages from the server? when I click start. The text area of the Server should say KnockKnock. but it appears it is not showing, any idea? sorry for the long code post, but I do not know to shorten them here. since I know most of them are important
推荐答案
正如您所说的，while 循环只是获取文本并将其打印到控制台.
Where exactly are you printing to the textarea as you are saying the while loop simply gets the text and prints it to the console.
// Put this code somewhere in the Client class so that when it receives something,
// it can be added to the `JTextArea`
while ((fromServer = in.readLine()) != null)
{
// You seems like missed the part that sends it to the textArea
System.out.println("Server: " + fromServer);
// Here send the received thing to your textarea, which goes something like this
String str = "Server : " + fromServer + "
";
tarea.append(str);
if (fromServer.equals("Bye."))
break;
// You can remove this part and put it inside the textField's actionPerformed method.
fromUser = stdIn.readLine();
if (fromUser != null)
{
System.out.println("Client: " + fromUser);
out.println(fromUser);
}
}
全新
只需从命令提示符启动 KnockKnockServer，而不是从扩展 JFrame 的类中启动.只需简单地编写 java KnockKnockServer，在命令提示符下运行你的服务器，现在在新的命令提示符下编译我给你的这个类并像 java KnockKnockClient 一样运行它，你会发现它没有完全工作.
Just start your KnockKnockServer from the command prompt, not from your class that extends JFrame. Just simply write java KnockKnockServer, to run your server on the command prompt, now on the new command prompt compile this class i am giving you and run it too like java KnockKnockClient, you will get an idea it's not working fully though.
import java.awt.BorderLayout;
import java.awt.event.*;
import java.io.*;
import java.net.*;
import javax.swing.*;
public class KnockKnockClient extends JFrame
{
public String fromServer;
public String fromUser;
// Added by me.--------------------
private JTextArea tarea;
private JTextField tfield;
private JScrollPane spane;
private PrintWriter out = null;
/*------------------------------------*/
public void Client() throws IOException
{
Socket kkSocket = null;
//PrintWriter out = null; Shifted this to the instance variable
BufferedReader in = null;
BufferedReader stdIn = new BufferedReader(new InputStreamReader(System.in));
try {
kkSocket = new Socket("127.0.0.1", 4444);
out = new PrintWriter(kkSocket.getOutputStream(), true);
in = new BufferedReader(new InputStreamReader(kkSocket.getInputStream()));
} catch (UnknownHostException e) {
System.err.println("Don't know about host: 127.0.0.1");
System.exit(1);
} catch (IOException e) {
System.err.println("Couldn't get I/O for the connection to: 127.0.0.1");
System.exit(1);
}
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLocationRelativeTo(null);
JPanel contentPane = new JPanel();
tarea = new JTextArea(10, 10);
spane = new JScrollPane(tarea);
tarea.setLineWrap(true);
tfield = new JTextField(10);
tfield.requestFocusInWindow();
contentPane.setLayout(new BorderLayout());
contentPane.add(spane, BorderLayout.CENTER);
contentPane.add(tfield, BorderLayout.PAGE_END);
setContentPane(contentPane);
pack();
setVisible(true);
Thread receiveMessage = new Thread(new ReceiveChat(in, stdIn, out));
receiveMessage.start();
tfield.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent ae)
{
// Here you will send it to the server side too, put that code here
fromUser = tfield.getText() + "
";
if (fromUser != null)
{
System.out.println("Client: " + fromUser);
tarea.append(fromUser);
out.println(fromUser);
tfield.setText("");
}
}
});
//out.close();
//in.close();
//stdIn.close();
//kkSocket.close();
}
private class ReceiveChat implements Runnable
{
private BufferedReader in;
private BufferedReader stdIn;
private PrintWriter out;
public ReceiveChat(BufferedReader in, BufferedReader stdIn, PrintWriter out)
{
this.in = in;
this.stdIn = stdIn;
this.out = out;
}
public void run()
{
try
{
while ((fromServer = in.readLine()) != null) {
//System.out.println("Server: " + fromServer);
String str = "Server : " + fromServer + "
";
tarea.append(str);
tarea.setCaretPosition(tarea.getDocument().getLength());
if (fromServer.equals("Bye."))
break;
/*Commented out by me.*/
/*fromUser = stdIn.readLine();
if (fromUser != null) {
System.out.println("Client: " + fromUser);
out.println(fromUser);
} */
}
}
catch(Exception e)
{
e.printStackTrace();
}
}
}
public static void main(String... args)
{
SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
KnockKnockClient client = new KnockKnockClient();
try
{
client.Client();
}
catch(Exception e)
{
e.printStackTrace();
}
}
});
}
}
让你的 KnockKnockServer 类的 while 循环看起来像这样:
Just let the while loop of your KnockKnockServer class look like this :
while ((inputLine = in.readLine()) != null)
{
if (inputLine.length() > 0)
{
outputLine = kkp.processInput(inputLine);
out.println(outputLine);
if (outputLine.equals("Bye."))
break;
}
}
这将使其按预期工作.
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