显示Java小程序格式

我通常不在java中使用applet或GUI，我仍在学习基础知识。但我有一个项目要做，它特别使用Applet。它是一个本地主机端口扫描程序

import java.net.Socket;

import javax.swing.*;
@SuppressWarnings("serial")
public class portScan extends JApplet{

    String remote = "localhost";
     int i = 0;
     String message;

     public portScan(){
         do {
           try {
           Socket s = new Socket(remote,i);
           s.close();
           message = "Server is listening on port " + i + " of " + remote;
           JOptionPane.showMessageDialog(rootPane, message);

           } catch (Exception e) {
           //System.out.println("Server is not listening on port " + i+ " of " + remote);
                }
           i++;
          } while(i <= 100);
     }

}

然后我将Applets.jar放在Applets/Applets.jar文件夹下，并将html代码更改为：

<applet id="Applets"
            code = "portScan.class"
            archive="applets/Applets.jar"
            width="80%"
            height="80%">
    </applet>

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浏览器中仍然没有显示

您是否对java小程序进行了签名？？？检查上面的编辑不要像现在这样忽略异常，并检查java控制台中打印的堆栈跟踪。

keytool -genkey -alias myAlias -keystore myCert -keypass myKeyPass -dname "CN=Applets" -storepass myStorePass -validity 1825

jarsigner -keystore myCert -keypass myKeyPass -storepass myStorePass Applets.jar myAlias

<applet id="Applets"
            code = "portScan.class"
            archive="applets/Applets.jar"
            width="80%"
            height="80%">
    </applet>