[IT科技] Applet用Http隧道技术和Servlet通讯

 
import java.io.*;
import java.applet.Applet;
import java.awt.*;
public class TestDataStreamApplet extends Applet {
  String response;
  public void init() {
    try {
      java.net.URL url = new java.net.URL(getDocumentBase(), "servlet/DataStreamEcho");
      java.net.URLConnection con = url.openConnection();
      con.setUseCaches(true);
      con.setDoOutput(true);
      con.setDoInput(true);
      ByteArrayOutputStream byteout = new ByteArrayOutputStream();
      DataOutputStream out = new DataOutputStream(byteout);
      out.writeUTF("hello world!");
      out.flush();
      byte buf[] = byteout.toByteArray();
      con.setRequestProperty("Content-type", "application/octest-stream");
      con.setRequestProperty("Content-length", "" + buf.length);
      DataOutputStream dataout = new DataOutputStream(con.getOutputStream());
      dataout.write(buf);
      dataout.flush();
      dataout.close();
      DataInputStream in = new DataInputStream(con.getInputStream());
      response = in.readUTF();
      System.out.println("read from server :" + response);
      in.close();
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
  public void paint(Graphics g) {
    g.drawString("read from server :" + response, 10, 20);
  }
}