import javax.swing.*;import java.io.Serializable;import java.rmi.registry.LocateRegistry;import java.rmi.registry.Registry;public class Server implements Serializable{    public static void main(String[] args) {        String test1= JOptionPane.showInputDialog(null,"Port(0-65535):","Port",JOptionPane.QUESTION_MESSAGE);        int portnumber = tryParse(test1);        if (portnumber !=0) {            try {                Registry reg = LocateRegistry.createRegistry(portnumber);   //Creates and exports a Registry instance on the local host that accepts requests                RmiImplementation imp = new RmiImplementation("C://ServerStorage");                reg.bind("remoteObject", imp);                System.out.println("Server is ready.");                System.out.println(portnumber);            } catch (Exception e) {                System.out.println("Server failed: " + e);            }        }    }    private static Integer tryParse(String text) {        try {            return Integer.parseInt(text);        } catch (Exception e) {            return 0;        }    }}上面的代碼幫助我設(shè)置我的文件服務(wù)器。當(dāng)應(yīng)用程序運(yùn)行時(shí)，會(huì)請(qǐng)求對(duì)話框端口號(hào)。如果我輸入字母而不是數(shù)字，程序?qū)⑼Ｖ惯\(yùn)行，但我希望它繼續(xù)并再次顯示對(duì)話框。