Java JLabel的套接字服务器问题

很长一段时间以来，我一直在努力创建一个按预期方式运行的套接字。作为一个例子，我创建了以下简单的swing程序来表示这个问题

运行时，用户在文本字段中输入一个数字并按下post按钮。然后创建一个套接字，并将输入的数字的分数带到服务器程序，该程序执行一种称为排行榜的方法。根据输入的数字和输入的数量，结果将以名为rank的字符串的形式给出，这就是我的问题开始的地方

无论我写什么代码，代码的顺序是什么，我都无法让服务器返回字符串秩并将字符串秩设置为客户端程序中JLabel l2的文本

我对套接字编程非常陌生，我确信我可能错过了一些重要的行。如果有任何人可以提供任何建议，我们将不胜感激，非常感谢

客户端代码： 服务器代码： 这是一份完整的报告。

package client;


public class client implements ActionListener {

public static JButton b;
public static JTextField tf;
public static JLabel l2;
String score;

public client(){
    JFrame f = new JFrame("SocketServer");

    JPanel bg = new JPanel();
    bg.setBounds(0, 0, 192, 266);
    bg.setBackground(Color.white);
    bg.setLayout(null);

    JLabel l1 = new JLabel("ENTER YOUR SCORE HERE:");
    l1.setBounds(10, 20, 172, 20);

    tf = new JTextField();
    tf.setBounds(10, 50, 172, 20);

    l2 = new JLabel();
    l2.setBounds(10, 80, 172, 20);

    b = new JButton("POST SCORE >>");
    b.setBounds(10, 120, 172, 20);
    b.addActionListener(this);

    f.setSize(200, 300);
    f.setLayout(null);
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.setLocationRelativeTo(null);
    f.setVisible(true);

    bg.add(l1);
    bg.add(tf);
    bg.add(l2);
    bg.add(b);
    f.add(bg);

}

public static void main(String args[]) {
    new client();
}

public void initClientSocket(){
    try {
        Socket socket = new Socket("localhost", 55555);

        PrintWriter out = new PrintWriter(socket.getOutputStream(), true);
        out.write(score);
        out.close();            
        socket.close();


        //BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
        //System.out.print("Recieved string: '\n"); ///// original and working
        //System.out.print("Recieved string: " + in.readLine() + "'\n"); ///// modified
        //while (!in.ready()) {}
        //l2.setText(in.readLine());
        //in.close();
    }
    catch(Exception e) {
        System.out.print("Whoops! It didn't work!\n");
    }
}

@Override
public void actionPerformed(ActionEvent a) {
    if (a.getSource() == b){
        //initClientSocket();
        score = tf.getText();
        tf.setText("");
        initClientSocket();

    }
}
}

package server;

class server {

static long scor;
static long s1 = 0;
static long s2 = 0;
static long s3 = 0;
static long s4 = 0;
static long s5 = 0;
static String rank;

public static void main(String args[]) {
    try {
        System.out.println("Waitng for client to connect.....");
        ServerSocket server = new ServerSocket(55555);
        Socket socket = server.accept();
        System.out.print("Client has connected!\n");

        BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
        String score = (in.readLine());
        scor = Long.parseLong(score);
        leaderboard();
        //in.close();////////////////////

        PrintWriter out = new PrintWriter(socket.getOutputStream(), true);
        System.out.print("Sending rank: " + rank);
        out.print(rank);
        //out.flush();
        out.close();
        socket.close();
        server.close();
    }
    catch(Exception e) {
        System.out.print("Whoops! It didn't work!\n");
    }
}

public static void leaderboard(){
    if (scor <= s1){
        if (scor <= s2){
            if (scor <= s3){
                if (scor <= s4){
                    if (scor <= s5){
                        rank = "Too low!";
                        return;
                    }
                    if (scor > s5){
                        s5 = scor;
                        rank = "You rank 5th!";
                        return;
                    }
                }
                if (scor > s4){
                    s4 = scor;
                    rank = "You rank 4th!";
                    return;
                }
            }
            if (scor > s3){
                s3 = scor;
                rank = "You rank 3rd!";
                return;
            }
        }
        if (scor > s2){
            s2 = scor;
            rank = "You rank 2nd!";
            return;
        }
    }
    if (scor > s1){
        s1 = scor;
        rank = "You rank 1st!";
        return;
    }
}
}