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java - 基于控制台的应用程序到 Java 中基于 GUI 的应用程序

转载 作者:塔克拉玛干 更新时间:2023-11-02 19:32:05 26 4
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我创建了(通过从互联网上收集一些代码片段)一个基于控制台的 LAN 聊天应用程序。现在我想

使用 Netbeans IDE 7.1 制作 GUI。它是一个多线程应用程序。在我基于控制台的应用程序中,每当我想显示输出时,我都会这样做

System.out.println(msg) . 

现在我想在 JFrame 窗体中完成,

jTextField1.setText(msg). 

我是否需要创建一个新的主类并创建一个 JFrameForm 实例并通过调用使其可见

new NewJFrame().setVisible(true); 

或者我应该在 JFrame 类本身中完成所有编码。我在下面展示了我的实际和工作代码(在控制台中)

import java.io.DataInputStream;
import java.io.PrintStream;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;
import java.net.Socket;
import java.net.UnknownHostException;

public class MultiThreadChatClient implements Runnable {

// The client socket
private static Socket clientSocket = null;
// The output stream
private static PrintStream os = null;
// The input stream
private static DataInputStream is = null;

private static BufferedReader inputLine = null;
private static boolean closed = false;

public static void main(String[] args) {

// The default port.
int portNumber = 2222;
// The default host.
String host = "127.0.0.1";

if (args.length < 2) {
System.out
.println("Usage: java MultiThreadChatClient <host> <portNumber>\n"
+ "Now using host=" + host + ", portNumber=" + portNumber);
} else {
host = args[0];
portNumber = Integer.valueOf(args[1]).intValue();
}

/*
* Open a socket on a given host and port. Open input and output streams.
*/
try {
clientSocket = new Socket(host, portNumber);
inputLine = new BufferedReader(new InputStreamReader(System.in));
os = new PrintStream(clientSocket.getOutputStream());
is = new DataInputStream(clientSocket.getInputStream());
} catch (UnknownHostException e) {
System.err.println("Don't know about host " + host);
} catch (IOException e) {
System.err.println("Couldn't get I/O for the connection to the host "
+ host);
}

/*
* If everything has been initialized then we want to write some data to the
* socket we have opened a connection to on the port portNumber.
*/
if (clientSocket != null && os != null && is != null) {
try {

/* Create a thread to read from the server. */
new Thread(new MultiThreadChatClient()).start();
while (!closed) {
os.println(inputLine.readLine().trim());
}
/*
* Close the output stream, close the input stream, close the socket.
*/
os.close();
is.close();
clientSocket.close();
} catch (IOException e) {
System.err.println("IOException: " + e);
}
}
}

/*
* Create a thread to read from the server. (non-Javadoc)
*
* @see java.lang.Runnable#run()
*/
public void run() {
/*
* Keep on reading from the socket till we receive "Bye" from the
* server. Once we received that then we want to break.
*/
String responseLine;
try {
while ((responseLine = is.readLine()) != null) {
System.out.println(responseLine);
if (responseLine.indexOf("*** Bye") != -1)
break;
}
closed = true;
} catch (IOException e) {
System.err.println("IOException: " + e);
}
}
}

//MultiThreadServer.java


import java.io.DataInputStream;
import java.io.PrintStream;
import java.io.IOException;
import java.net.Socket;
import java.net.ServerSocket;

/*
* A chat server that delivers public and private messages.
*/
public class MultiThreadChatServer {

// The server socket.
private static ServerSocket serverSocket = null;
// The client socket.
private static Socket clientSocket = null;

// This chat server can accept up to maxClientsCount clients' connections.
private static final int maxClientsCount = 10;
private static final clientThread[] threads = new clientThread[maxClientsCount];

public static void main(String args[]) {

// The default port number.
int portNumber = 2222;
if (args.length < 1) {
System.out
.println("Usage: java MultiThreadChatServer <portNumber>\n"
+ "Now using port number=" + portNumber);
} else {
portNumber = Integer.valueOf(args[0]).intValue();
}

/*
* Open a server socket on the portNumber (default 2222). Note that we can
* not choose a port less than 1023 if we are not privileged users (root).
*/
try {
serverSocket = new ServerSocket(portNumber);
} catch (IOException e) {
System.out.println(e);
}

/*
* Create a client socket for each connection and pass it to a new client
* thread.
*/
while (true) {
try {
clientSocket = serverSocket.accept();
int i = 0;
for (i = 0; i < maxClientsCount; i++) {
if (threads[i] == null) {
(threads[i] = new clientThread(clientSocket, threads)).start();
break;
}
}
if (i == maxClientsCount) {
PrintStream os = new PrintStream(clientSocket.getOutputStream());
os.println("Server too busy. Try later.");
os.close();
clientSocket.close();
}
} catch (IOException e) {
System.out.println(e);
}
}
}
}

//ChatClient.java

/*
* The chat client thread. This client thread opens the input and the output
* streams for a particular client, ask the client's name, informs all the
* clients connected to the server about the fact that a new client has joined
* the chat room, and as long as it receive data, echos that data back to all
* other clients. When a client leaves the chat room this thread informs also
* all the clients about that and terminates.
*/
class clientThread extends Thread {

private DataInputStream is = null;
private PrintStream os = null;
private Socket clientSocket = null;
private final clientThread[] threads;
private int maxClientsCount;

public clientThread(Socket clientSocket, clientThread[] threads) {
this.clientSocket = clientSocket;
this.threads = threads;
maxClientsCount = threads.length;
}

public void run() {
int maxClientsCount = this.maxClientsCount;
clientThread[] threads = this.threads;

try {
/*
* Create input and output streams for this client.
*/
is = new DataInputStream(clientSocket.getInputStream());
os = new PrintStream(clientSocket.getOutputStream());
os.println("Enter your name.");
String name = is.readLine().trim();
os.println("Hello " + name
+ " to our chat room.\nTo leave enter /quit in a new line");
for (int i = 0; i < maxClientsCount; i++) {
if (threads[i] != null && threads[i] != this) {
threads[i].os.println("*** A new user " + name
+ " entered the chat room !!! ***");
}
}
while (true) {
String line = is.readLine();
if (line.startsWith("/quit")) {
break;
}
for (int i = 0; i < maxClientsCount; i++) {
if (threads[i] != null) {
threads[i].os.println("<" + name + "&gr; " + line);
}
}
}
for (int i = 0; i < maxClientsCount; i++) {
if (threads[i] != null && threads[i] != this) {
threads[i].os.println("*** The user " + name
+ " is leaving the chat room !!! ***");
}
}
os.println("*** Bye " + name + " ***");

/*
* Clean up. Set the current thread variable to null so that a new client
* could be accepted by the server.
*/
for (int i = 0; i < maxClientsCount; i++) {
if (threads[i] == this) {
threads[i] = null;
}
}

/*
* Close the output stream, close the input stream, close the socket.
*/
is.close();
os.close();
clientSocket.close();
} catch (IOException e) {
}
}

最佳答案

虽然严格来说不是原始问题的一部分,但控制台应用程序和 GUI 应用程序之间存在许多非常重要的区别。

首先,线程模型是不同的,您花时间了解使用它的内容、位置和方式非常重要。

首先,永远不要在 Event Dispatching Thread 中做任何事情(又名 EDT)(主 UI 线程)将阻止它,例如 IO 操作......如果可能,在另一个线程或 worker 的后台执行这些操作.

永远不要从除 EDT 之外的任何线程更新 UI 组件。 SwingWorker在某些情况下可以提供帮助,当它不能时,您需要依赖 SwingUtilities.invokeLater/invokeAndWait

关于java - 基于控制台的应用程序到 Java 中基于 GUI 的应用程序,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/12655937/

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