Create MD5 hash in JSP

String plainText = "123456";
MessageDigest mdAlgorithm = MessageDigest.getInstance("MD5");

byte[] digest = mdAlgorithm.digest();
StringBuffer hexString = new StringBuffer();

for (int i = 0; i < digest.length; i++) {
    plainText = Integer.toHexString(0xFF & digest[i]);

    if (plainText.length() < 2) {
        plainText = "0" + plainText;


Published May 19, 2004 · Updated September 17, 2005
Categorized as Java
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9 Comments · RSS feed
flip said on September 27, 2005

IMHO a very nice solution, all the others I've seen so far involve pages of code or some obscure libraries. Thank You!

Viktor said on December 19, 2005

I have been looking for this a long time, thanks!

Fuzz said on February 20, 2006

great solution!

gid said on June 01, 2006

Works like a charm, the solution I was using,

String md5 = new BigInteger( 1, md.digest() ).toString(16);

wanted to truncated leading 0's, this one doesn't.

said on August 30, 2006

I used your code but modified it so I can hash strings and other objects.

    public static String getHash(Object o)
    		MessageDigest mdAlgorithm = MessageDigest.getInstance("MD5");
    		ByteArrayOutputStream baos = new ByteArrayOutputStream();
    		ObjectOutputStream oos = new ObjectOutputStream(baos);

    		byte[] digest = mdAlgorithm.digest();
    		StringBuffer hexString = new StringBuffer();

    		for (int i = 0; i < digest.length; i++)
    			String x = Integer.toHexString(0xFF & digest[i]);
    			if (x.length() < 2) x = "0" + x;
    	catch(NoSuchAlgorithmException e) { return(null); }
    	catch(IOException e) { return(null); }
Patrick said on October 27, 2006

Thanks! This solution saves me some time ;)

d said on November 18, 2006

var i=0;
while (var<5)
documnet.write("Hello World!");

Jon Cram said on December 06, 2006

Excellent example!

I'm just starting out building Java apps and need to add some authentication.

I decided upon storing user details in a plain text file (college project - simplest option - not allowed to use a DB) and wanted to shadow passwords. Now I can!

Brian said on February 19, 2007

nice job!!!

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