HttpsClient.java - HTTPS Client Test Program

JDK Tutorials - Herong's Tutorial Examples

∟HTTPS (Hypertext Transfer Protocol Secure)

∟HttpsClient.java - HTTPS Client Test Program

This section provides a tutorial example on how to write a HTTPS client test program, HttpsClient.java. It sends a simple HTTP request page using the HTTPS protocol.

To test HttpsHello.java presented in the previous section, I wrote a simple HTTPS client program, HttpsClient.java:

/* HttpsClient.java
 * Copyright (c) HerongYang.com. All Rights Reserved.
 */
import java.io.*;
import java.net.*;
import javax.net.ssl.*;
public class HttpsClient {
   public static void main(String[] args) {
      PrintStream out = System.out;

      // Getting the default SSL socket factory
      SSLSocketFactory f =
         (SSLSocketFactory) SSLSocketFactory.getDefault();
      out.println("The default SSL socket factory class: "
         +f.getClass());
      try {
      // Getting the default SSL socket factory
         SSLSocket c =
           (SSLSocket) f.createSocket("localhost", 8888);
         printSocketInfo(c);
         c.startHandshake();
         BufferedWriter w = new BufferedWriter(new OutputStreamWriter(
            c.getOutputStream()));
         BufferedReader r = new BufferedReader(new InputStreamReader(
            c.getInputStream()));
         w.write("GET / HTTP/1.0");
         w.newLine();
         w.newLine(); // end of HTTP request
         w.flush();
         String m = null;
         while ((m=r.readLine())!= null) {
            out.println(m);
         }
         w.close();
         r.close();
         c.close();
      } catch (IOException e) {
         e.printStackTrace();
      }
   }
   private static void printSocketInfo(SSLSocket s) {
      System.out.println("Socket class: "+s.getClass());
      System.out.println("   Remote address = "
         +s.getInetAddress().toString());
      System.out.println("   Remote port = "+s.getPort());
      System.out.println("   Local socket address = "
         +s.getLocalSocketAddress().toString());
      System.out.println("   Local address = "
         +s.getLocalAddress().toString());
      System.out.println("   Local port = "+s.getLocalPort());
      System.out.println("   Need client authentication = "
         +s.getNeedClientAuth());
      SSLSession ss = s.getSession();
      System.out.println("   Cipher suite = "+ss.getCipherSuite());
      System.out.println("   Protocol = "+ss.getProtocol());
   }
}

This program works correct with JDK 1.7 and older versions. Of course, we have to run HttpsClient.java with the server's certificate in a trusted key store file.

Here is how the program works with JDK 1.7:

herong> java -Djavax.net.ssl.trustStore=public.jks HttpsClient.java

The default SSL socket factory class:
   class com.sun.net.ssl.internal.ssl.SSLSocketFactoryImpl
Socket class: class com.sun.net.ssl.internal.ssl.SSLSocketImpl
   Remote address = localhost/127.0.0.1
   Remote port = 8888
   Local socket address = /127.0.0.1:2408
   Local address = /127.0.0.1
   Local port = 2408
   Need client authentication = false
   Cipher suite = TLS_DHE_DSS_WITH_AES_128_CBC_SHA
   Protocol = TLSv1
HTTP/1.0 200 OK
Content-Type: text/html

<html><body>Hello world!</body></html>