Java HTPPS SSL Client

HTTPS secure HTTP connection , HTTP over secure socket layer (SSL).
To establish an HTTPS connection to a remote server , you should use the certificate obtained by the server. This certificate is validated using a local trust store. Default trust store is /lib/security/cacerts. You can define another trust store using keytool application in /bin. Certificates can be added to trust store with keytool application also.

You should give trust store parameter to JVM like this :

-Djavax.net.ssl.trustStore=/mypath/my.keystore
-Djavax.net.ssl.trustStorePassword=mypassword

Here is the sample code to create an HTTPS connection:

package javacream;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.URLEncoder;
import java.security.Security;

import javax.net.ssl.SSLSocket;
import javax.net.ssl.SSLSocketFactory;

public class HTTPSClient {

 public static void main(String[] args) {
  String resp = sendReq("myserver.mydomain.com",
    "/myapp/findbookservlet", "bookID=2323");
  System.out.println(resp);
 }

 // Uses post to fetch data , return null if it fails.
 public static String sendReq(String host, String path, String data) {

  int port = 443; // default https port

  BufferedWriter wr = null;
  BufferedReader in = null;
  SSLSocket socket = null;

  try {
   Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider());
   SSLSocketFactory factory = (SSLSocketFactory) SSLSocketFactory
     .getDefault();
   socket = (SSLSocket) factory.createSocket(host, port);
   String[] supported = socket.getSupportedCipherSuites();
   socket.setEnabledCipherSuites(supported);
   String encData = URLEncoder.encode(data, "UTF-8");

   wr = new BufferedWriter(new OutputStreamWriter(socket
     .getOutputStream(), "UTF8"));
   wr.write("POST " + path + " HTTP/1.0\r\n");
   wr.write("Content-Length: " + data.length() + "\r\n");
   wr.write("Content-Type: application/x-www-form-urlencoded\r\n");
   wr.write("\r\n");
   wr.write(data);
   wr.flush();
   // read response
   in = new BufferedReader(new InputStreamReader(socket
     .getInputStream(), "UTF-8"));
   int c;
   StringBuffer sb = new StringBuffer();

   while ((c = in.read()) != -1) {
    sb.append((char) c);
   }
   System.out.println("SSL Response:" + sb.toString());
   return sb.toString();
  } catch (Exception e) {
   e.printStackTrace();
  } finally {
   if (wr != null)
    try {
     wr.close();
    } catch (IOException e2) {
     e2.printStackTrace();
    }
   if (in != null)
    try {
     in.close();
    } catch (IOException e1) {
     e1.printStackTrace();
    }
   if (socket != null)
    try {
     socket.close();
    } catch (IOException e2) {
     e2.printStackTrace();
    }

  }

  return null;
 }
}