我正在尝试为客户端应用程序创建GUI。 BufferedReader的.readLine（）充当输入流。问题是它在控制台中完美地打印换行符和回车符，但是一旦我尝试将它附加到TextArea中，它似乎只是重写了前一个字符串。这是示例代码
public class AirlinesClient extends JFrame implements ActionListener {
public static BufferedReader socketIn = null;
public static PrintWriter socketOut = null;
public static Socket connection = null;
public static String breakline;
public static String command;
public AirlinesClient() throws UnknownHostException, IOException{
JPanel schPanel = new JPanel();
JButton Schedules = new JButton ("Flight Schedules");
JButton Pilots = new JButton ("Pilots' shifts");
//mainFrame
super.setSize(300, 400);
setLocationByPlatform(true);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setVisible(true);
//adding ScheduleButton's panel to the root frame
schPanel.setLayout(null);
getContentPane().add(schPanel);
//Adding Schedule button
Schedules.setBounds(75, 10, 150, 50);
Schedules.setVisible(true);
schPanel.add(Schedules);
//Adding action on click
Schedules.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
JTextArea area = new JTextArea(20,20);
JFrame scheduleFrame = new JFrame("Information");
scheduleFrame.setSize(800,400);
scheduleFrame.setDefaultCloseOperation(DISPOSE_ON_CLOSE);
scheduleFrame.setLocationRelativeTo(null);
scheduleFrame.add(area);
scheduleFrame.setVisible(true);
socketOut.flush();
socketOut.println("1");
area.append(breakline);
}
});
//Adding pilots' shifts
Pilots.setBounds(75, 70, 150, 50);
Pilots.setVisible(true);
schPanel.add(Pilots);
}
public static void main(String[] args) throws UnknownHostException, IOException {
new AirlinesClient();
int port = 1234;
String host = "localhost";
connection = new Socket(host,port);
socketIn = new BufferedReader(new InputStreamReader(connection.getInputStream()));
socketOut = new PrintWriter(connection.getOutputStream(),true);
try{
System.out.println("Successfully connected to the server!");
do{
//This prints the output in the console and it ends when the server sends $$$
while (!(breakline =socketIn.readLine()).equals("$$$")){
System.out.println(breakline);
}
//Command is input from the user keyboard but for testing purposes I'm only using
//a single socketOut command(from the actionlistener) to send commands
}while(command!="0");
System.out.println("Closing connection to server!");
}catch(IOException e){
e.printStackTrace();
} finally{
try{
if(socketIn!=null) socketIn.close();
if(socketOut!=null) socketOut.close();
if(connection!=null) connection.close();
}
catch(IOException e){
System.err.println("Socket could not be closed!");
}
}
}
@Override
public void actionPerformed(ActionEvent arg0) {
}
}