Образец апплета с обработкой HTTP(XML)-запроса

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.applet.Applet;
import java.net.*;
 
import org.w3c.dom.*;
import org.xml.sax.SAXException;
import javax.xml.parsers.*;
import javax.xml.xpath.*;
import java.io.*;
 
public class XmlHttpTest extends Applet {
  static Frame frame;
  static Choice pStamp;
 
  public static void main(String[] args) {
    (new XmlHttpTest()).init();
  }
 
  public void init(){
    frame=new Frame("XmlHttpTest");
    frame.setSize(830,70);
    frame.setFont(new Font ("Arial", Font.BOLD, 20));
 
    Button getStamp=new Button("Получить временные ряды через HTTP");
    frame.add(getStamp);
    pStamp=new Choice();
    frame.add(pStamp);
 
    frame.setLayout(new GridLayout(1,2, 3,3));
    frame.setVisible(true);
 
    getStamp.addActionListener(
      new ActionListener() {
        public void actionPerformed(ActionEvent e) {
          pStamp.removeAll();
          String SQL="select tstamp from th5 order by 1 desc;";
          String tstamp;
          try{
            URL url = new URL("http://advanta.sytes.net/sql2xml.php?"+ URLEncoder.encode(SQL,"UTF-8"));
            URLConnection conn = url.openConnection();
            InputStream in = conn.getInputStream();
 
            DocumentBuilderFactory domFactory =
              DocumentBuilderFactory.newInstance("com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderFactoryImpl",null);
            domFactory.setNamespaceAware(true);
            DocumentBuilder builder = domFactory.newDocumentBuilder();
 
            Document doc = builder.parse(in);
            XPathFactory factory = XPathFactory.newInstance();
            XPath xpath = factory.newXPath();
            XPathExpression expr = xpath.compile("//ROW/tstamp/text()");
 
            Object result = expr.evaluate(doc, XPathConstants.NODESET);
            NodeList nodes = (NodeList) result;
            for (int i = 0; i < nodes.getLength(); i++) {
              tstamp=nodes.item(i).getNodeValue();
              pStamp.add(
                tstamp.substring(0,4)+"-"+
                tstamp.substring(4,6)+"-"+
                tstamp.substring(6,8)+" "+
                tstamp.substring(8,10)+":"+
                tstamp.substring(10,12)
              );
            }
            JOptionPane.showMessageDialog(null, "Временые ряды получены");
          } catch(Exception ex) {
            ex.printStackTrace();
            JOptionPane.showMessageDialog(null, ex.getMessage());
          }
        }
    });
 
    frame.addWindowListener(
      new WindowAdapter(){
        public void windowClosing(WindowEvent e){
          frame.dispose();
        }
    });
  }
/*
<HTML>
<HEAD>
<TITLE>Загрузить XmlHttpTest</TITLE>
</HEAD>
<BODY>
 
<input type="button" value="Загрузить XmlHttpTest" onclick="startApplet()" 
  style="font-size:30px;cursor: pointer;" />
 
<script type="text/javascript">
  function startApplet() {
    appletsource= '<applet code="XmlHttpTest" archive="XmlHttpTest.jar"\n';
    appletsource+= 'wi-dth=800 hei-ght=400 style="visibility: hidden">\n';
    appletsource+= '<param name="cache_option" value="no" >\n';
    appletsource+= '</applet>\n';
    var oW=window.open("","newwin","height=300,width=300,status=yes");
    oW.document.write("<html>")
    oW.document.write("<title>")
    oW.document.write("invalid-Http-Applet")
    oW.document.write("</title>")
    oW.document.write(appletsource)
    oW.document.write("</html>")
}
</script>
<div id = "appletplace" style="height:0;" />
 
</BODY>
</HTML>
 
*/
}

java.policy

...
grant { permission java.security.AllPermission; };

//grant codeBase "file:${{java.ext.dirs}}/*" { permission java.security.AllPermission; };
...

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Образец апплета с обработкой HTTP(XML)-запроса

java.policy