applet 과 servlet 통신하기

import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;

/**
 * Simple demonstration for an Applet <-> Servlet communication.
 */
public class EchoApplet extends Applet {
 private TextField inputField = new TextField();
 private TextField outputField = new TextField();
 private TextArea exceptionArea = new TextArea();

 /**
  * Setup the GUI.
  */
 public void init() {
  // set new layout
  setLayout(new GridBagLayout());

  // add title  
  Label title = new Label("Echo Applet", Label.CENTER);
  title.setFont(new Font("SansSerif", Font.BOLD, 14));
  GridBagConstraints c = new GridBagConstraints();
  c.gridwidth = GridBagConstraints.REMAINDER;
  c.weightx = 1.0;
  c.fill = GridBagConstraints.HORIZONTAL;
  c.insets = new Insets(5, 5, 5, 5);
  add(title, c);

  // add input label, field and send button
  c = new GridBagConstraints();
  c.anchor = GridBagConstraints.EAST;
  add(new Label("Input:", Label.RIGHT), c);
  c = new GridBagConstraints();
  c.fill = GridBagConstraints.HORIZONTAL;
  c.weightx = 1.0;
  add(inputField, c);
  Button sendButton = new Button("Send");
  c = new GridBagConstraints();
  c.gridwidth = GridBagConstraints.REMAINDER;
  add(sendButton, c);
  sendButton.addActionListener(new ActionListener() {
   public void actionPerformed(ActionEvent e) {
    onSendData();
   }
  });

  // add output label and non-editable field
  c = new GridBagConstraints();
  c.anchor = GridBagConstraints.EAST;
  add(new Label("Output:", Label.RIGHT), c);
  c = new GridBagConstraints();
  c.gridwidth = GridBagConstraints.REMAINDER;
  c.fill = GridBagConstraints.HORIZONTAL;
  c.weightx = 1.0;
  add(outputField, c);
  outputField.setEditable(false);

  // add exception label and non-editable textarea
  c = new GridBagConstraints();
  c.anchor = GridBagConstraints.EAST;
  add(new Label("Exception:", Label.RIGHT), c);
  c = new GridBagConstraints();
  c.gridwidth = GridBagConstraints.REMAINDER;
  c.weighty = 1;
  c.fill = GridBagConstraints.BOTH;
  add(exceptionArea, c);
  exceptionArea.setEditable(false);
 }

 /**
  * Get a connection to the servlet.
  */
 private URLConnection getServletConnection()
  throws MalformedURLException, IOException {

  // Connection zum Servlet ?fnen
  URL urlServlet = new URL(getCodeBase(), "echo");
  URLConnection con = urlServlet.openConnection();

  // konfigurieren
  con.setDoInput(true);
  con.setDoOutput(true);
  con.setUseCaches(false);
  con.setRequestProperty(
   "Content-Type",
   "application/x-java-serialized-object");

  // und zur?kliefern
  return con;
 }

 /**
  * Send the inputField data to the servlet and show the result in the outputField.
  */
 private void onSendData() {
  try {
   // get input data for sending
   String input = inputField.getText();

   // send data to the servlet
   URLConnection con = getServletConnection();
   OutputStream outstream = con.getOutputStream();
   ObjectOutputStream oos = new ObjectOutputStream(outstream);
   oos.writeObject(input);
   oos.flush();
   oos.close();

   // receive result from servlet
   InputStream instr = con.getInputStream();
   ObjectInputStream inputFromServlet = new ObjectInputStream(instr);
   String result = (String) inputFromServlet.readObject();
   inputFromServlet.close();
   instr.close();

   // show result
   outputField.setText(result);

  } catch (Exception ex) {
   ex.printStackTrace();
   exceptionArea.setText(ex.toString());
  }
 }
}

 

import java.io.*;

import javax.servlet.ServletException;
import javax.servlet.http.*;

/**
 * Simple demonstration for an Applet <-> Servlet communication.
 */
public class EchoServlet extends HttpServlet {
 /**
  * Get a String-object from the applet and send it back.
  */
 public void doPost(
  HttpServletRequest request,
  HttpServletResponse response)
  throws ServletException, IOException {
  try {
   response.setContentType("application/x-java-serialized-object");

   // read a String-object from applet
   // instead of a String-object, you can transmit any object, which
   // is known to the servlet and to the applet
   InputStream in = request.getInputStream();
   ObjectInputStream inputFromApplet = new ObjectInputStream(in);
   String echo = (String) inputFromApplet.readObject();

   // echo it to the applet
   OutputStream outstr = response.getOutputStream();
   ObjectOutputStream oos = new ObjectOutputStream(outstr);
   oos.writeObject(echo);
   oos.flush();
   oos.close();

  } catch (Exception e) {
   e.printStackTrace();
  }
 }

}

 

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<title> Plugin example </title>
<body bgcolor="white">
<jsp:plugin type="applet" code="appletsrc.AppletToServer2.class"
codebase="appletArchive"
jreversion="1.5"
width="100%"
height="100%"
archive="jfreechart-1.0.9.jar,jcommon-1.0.12.jar,jwork.jar"
>
<jsp:params>
 <jsp:param name="paramval" value="Hello!! jsp:param" />
 <jsp:param name="servlet" value="http://203.245.121.43:8888/gsgroup/jwork/groupTest2.do" />
 <jsp:param name="title" value="나의 차트 테스트" />
 <jsp:param name="domainAxisLabel" value="LABEL 1" />
 <jsp:param name="rangeAxisLabel" value="LABEL 2" />
 <jsp:param name="orientation" value="H" />
 
</jsp:params>
</jsp:plugin>
</body>
</html>