HTTPS using certificate

[MCJP]

Good morning.

I am fairly new to Java, so please be patient.

I am currently working on a small Java class to recover the header of a URL to determine the last modification date. I am using a previously developed Java class that does it for HTTP, but want to extend it to HTTPS. I know that in general certificates should be imported into a keystore file so that secure sockets can refer to them. However, I would like to be able to load the certificate from a file dynamically.

The original HTTP code is the following (using JDK 1.5)

 
package com.xxx.utils.http;
 
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
 

public class HttpFile {
	private String url = null;
	private HttpURLConnection urlConn = null;
 
	public HttpFile(String url) {
		this.url = url;
		if (this.url != null) {
			try {
				URL u = new URL(url);
				URLConnection conn = u.openConnection();
				this.urlConn = (HttpURLConnection)conn;
			}
			catch (Exception ex) {
				ex.printStackTrace();
			}
		}
	}

	public void Finalize() {
		if (this.urlConn != null) {
			this.urlConn.disconnect();
		}
		this.urlConn = null;
	}

	public boolean exists() {
		try {
			if (this.urlConn != null) {
				return (this.urlConn.getResponseCode() == HttpURLConnection.HTTP_OK);
			} else {
				return false;
			}
		}
		catch (Exception ex) {
			return false;
		}
	}

	public long lastModified() {
		if (this.exists()) {
			return this.urlConn.getHeaderFieldDate("Last-Modified", 0);
		} else {
			return 0L;
		}
	}
 

	public static boolean exists(String url) {
		HttpFile hf = new HttpFile(url);
		boolean exists = hf.exists();
		hf.Finalize();
		return exists;
	}
 

	public static long lastModified(String url) {
		HttpFile hf = new HttpFile(url);
		long lastModified = hf.lastModified();
		hf.Finalize();
		return lastModified;
	}
}

If you have any ideas, I would certainly appreciate it.

[suprabha]

use ssl configuration of http..it will help..