Java单线程聊天应用程序
我正在努力学习网络编程。我的任务是使用JavaSwing创建一个单线程的客户机-服务器聊天应用程序。我在更新GUI时遇到问题。我使用了一个文本区域来显示消息,另一个文本区域来发送消息。有一个按钮,您可以单击该按钮发送消息。我使用定时器每5秒更新一次GUI。应用程序运行。GUI最初更新,然后屏幕冻结。有人能帮我吗?我想知道我错在哪里Java单线程聊天应用程序,java,swing,timer,network-programming,client-server,Java,Swing,Timer,Network Programming,Client Server,我正在努力学习网络编程。我的任务是使用JavaSwing创建一个单线程的客户机-服务器聊天应用程序。我在更新GUI时遇到问题。我使用了一个文本区域来显示消息,另一个文本区域来发送消息。有一个按钮,您可以单击该按钮发送消息。我使用定时器每5秒更新一次GUI。应用程序运行。GUI最初更新,然后屏幕冻结。有人能帮我吗?我想知道我错在哪里 package chattingapplication; import java.awt.event.ActionEvent; import java.awt.ev
package chattingapplication;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.Timer;
/**
*
* @author Qanita
*/
public class ServerMessenger extends javax.swing.JFrame {
private int port;
private ServerSocket server;
private Socket client;
private BufferedReader clientMessage;
private PrintWriter serverMessage;
private Timer timer;
private ActionListener updateDisplay;
private String receivingMessage;
private String sendingMessage;
/**
* Creates new form ServerMessenger
*/
public ServerMessenger() {
initComponents();
port = 13;
try {
server = new ServerSocket(port);
client = null;
client = server.accept();
clientMessage = new BufferedReader(new InputStreamReader(client.getInputStream()));
serverMessage = new PrintWriter(client.getOutputStream(), true);
updateDisplay = new ActionListener() {
@Override
public void actionPerformed(ActionEvent evt) {
receiveMessage();
displayClientMessage();
System.out.println("\nin timer");
}
};
timer = new Timer(5000, updateDisplay);
timer.setRepeats(true);
timer.start();
}
catch (Exception e) {
System.err.println(e);
}
}
private void displayClientMessage()
{
if ( receivingMessage != null )
{
receivingMessage = "\nClient : " + receivingMessage;
displayArea.setText( displayArea.getText() + receivingMessage );
}
}
private void displayServerMessage()
{
sendingMessage = "\nServer : " + sendingMessage;
displayArea.setText( displayArea.getText() + sendingMessage );
}
private void sendMessage()
{
sendingMessage = writingArea.getText();
serverMessage.println(sendingMessage);
}
private void receiveMessage()
{
try {
receivingMessage = clientMessage.readLine();
} catch (IOException ex) {
Logger.getLogger(ServerMessenger.class.getName()).log(Level.SEVERE, null, ex);
}
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jScrollPane2 = new javax.swing.JScrollPane();
displayArea = new javax.swing.JTextArea();
jScrollPane1 = new javax.swing.JScrollPane();
writingArea = new javax.swing.JTextArea();
enter = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setTitle("Server");
setResizable(false);
displayArea.setEditable(false);
displayArea.setColumns(20);
displayArea.setLineWrap(true);
displayArea.setRows(5);
jScrollPane2.setViewportView(displayArea);
writingArea.setColumns(20);
writingArea.setRows(5);
jScrollPane1.setViewportView(writingArea);
enter.setText("Send");
enter.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
enterActionPerformed(evt);
}
});
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jScrollPane2)
.addGroup(layout.createSequentialGroup()
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 186, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(enter, javax.swing.GroupLayout.PREFERRED_SIZE, 61, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(0, 0, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jScrollPane2, javax.swing.GroupLayout.DEFAULT_SIZE, 420, Short.MAX_VALUE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 0, Short.MAX_VALUE)
.addComponent(enter, javax.swing.GroupLayout.PREFERRED_SIZE, 55, javax.swing.GroupLayout.PREFERRED_SIZE)))
);
pack();
}// </editor-fold>
private void enterActionPerformed(java.awt.event.ActionEvent evt) {
sendMessage();
writingArea.setText("");
displayServerMessage();
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(ServerMessenger.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(ServerMessenger.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(ServerMessenger.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(ServerMessenger.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
new ServerMessenger().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JTextArea displayArea;
private javax.swing.JButton enter;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JScrollPane jScrollPane2;
private javax.swing.JTextArea writingArea;
// End of variables declaration
套餐聊天应用;
导入java.awt.event.ActionEvent;
导入java.awt.event.ActionListener;
导入java.io.BufferedReader;
导入java.io.IOException;
导入java.io.InputStreamReader;
导入java.io.PrintWriter;
导入java.net.ServerSocket;
导入java.net.Socket;
导入java.util.logging.Level;
导入java.util.logging.Logger;
导入javax.swing.Timer;
/**
*
*@作者Qanita
*/
公共类ServerMessenger扩展了javax.swing.JFrame{
专用int端口;
专用服务器套接字服务器;
专用套接字客户端;
私有缓冲阅读器客户端消息;
私有PrintWriter服务器消息;
私人定时器;
私有ActionListener updateDisplay;
私有字符串接收消息;
私有字符串发送消息;
/**
*创建新表单ServerMessenger
*/
公共服务器Messenger(){
初始化组件();
端口=13;
试一试{
服务器=新的服务器套接字(端口);
client=null;
client=server.accept();
clientMessage=new BufferedReader(新的InputStreamReader(client.getInputStream());
serverMessage=新的PrintWriter(client.getOutputStream(),true);
updateDisplay=newActionListener(){
@凌驾
已执行的公共无效操作(操作事件evt){
receiveMessage();
displayClientMessage();
System.out.println(“\n计时器”);
}
};
定时器=新定时器(5000,更新显示);
timer.setRepeats(真);
timer.start();
}
捕获(例外e){
系统错误println(e);
}
}
私有void displayClientMessage()
{
如果(接收消息!=null)
{
receivingMessage=“\n客户端:”+receivingMessage;
displayArea.setText(displayArea.getText()+接收消息);
}
}
私有void displayServerMessage()
{
sendingMessage=“\n服务器:”+sendingMessage;
displayArea.setText(displayArea.getText()+发送消息);
}
私有void sendMessage()
{
sendingMessage=writingArea.getText();
serverMessage.println(sendingMessage);
}
私有void receiveMessage()
{
试一试{
receivingMessage=clientMessage.readLine();
}捕获(IOEX异常){
Logger.getLogger(ServerMessenger.class.getName()).log(Level.SEVERE,null,ex);
}
}
/**
*从构造函数中调用此方法来初始化表单。
*警告:不要修改此代码。此方法的内容始终为
*由表单编辑器重新生成。
*/
@抑制警告(“未选中”)
//
私有组件(){
jScrollPane2=newjavax.swing.JScrollPane();
displayArea=newjavax.swing.JTextArea();
jScrollPane1=newjavax.swing.JScrollPane();
writingArea=newjavax.swing.JTextArea();
enter=newjavax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setTitle(“服务器”);
可设置大小(假);
displayArea.setEditable(假);
displayArea.setColumns(20);
displayArea.setLineWrap(真);
显示区域。设置行(5);
jScrollPane2.setViewportView(显示区域);
写入区域设置列(20);
写入区域设置行(5);
jScrollPane1.setViewportView(写入区域);
输入.setText(“发送”);
输入.addActionListener(新java.awt.event.ActionListener(){
public void actionPerformed(java.awt.event.ActionEvent evt){
已执行的交易(evt);
}
});
javax.swing.GroupLayout=newjavax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(布局);
layout.setHorizontalGroup(
createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jScrollPane2)
.addGroup(layout.createSequentialGroup()
.addComponent(jScrollPane1,javax.swing.GroupLayout.PREFERRED\u SIZE,186,javax.swing.GroupLayout.PREFERRED\u SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(输入javax.swing.GroupLayout.PREFERRED\u SIZE,61,javax.swing.GroupLayout.PREFERRED\u SIZE)
.addGap(0,0,短.MAX_值))
);
layout.setVerticalGroup(
createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jScrollPane2,javax.swing.GroupLayout.DEFAULT\u SIZE,420,Short.MAX\u值)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING,false)
.addComponent(jScrollPane1,javax.swing.GroupLayout.PREFERRED_SIZE,0,Short.MAX_值)
.addComponent(输入javax.swing.GroupLayout.PREFERRED_SIZE,55,javax.swing.GroupLayout.PREFERRED_SIZE)))
);
包装();
}//
私有无效enterActionPerformed(java.awt.event.ActionEvent evt){
sendMessage();
写入区域设置文本(“”);
displayServerMessage();
}
/**
*@param指定命令行参数
*/
公共静态void main(字符串参数[]){
/*设置Nimbus的外观和感觉*/
//
/*如果Nimbus(在JavaSE6中引入)不可用,请使用默认的外观。
*详情请参阅http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
试一试{
for(javax.swing.U)