MD5 加密

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class TestMD5 {
	private String getMD5Str(String str) {
		MessageDigest messageDigest = null;

		try {
			messageDigest = MessageDigest.getInstance("MD5");

			messageDigest.reset();

			messageDigest.update(str.getBytes("UTF-8"));
		} catch (NoSuchAlgorithmException e) {
			System.out.println("NoSuchAlgorithmException caught!");
			System.exit(-1);
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		}

		byte[] byteArray = messageDigest.digest();
		StringBuffer md5StrBuff = new StringBuffer();

		for (int i = 0; i < byteArray.length; i++) {
			if (Integer.toHexString(0xFF & byteArray[i]).length() == 1)
				md5StrBuff.append("0").append(
						Integer.toHexString(0xFF & byteArray[i]));
			else
				md5StrBuff.append(Integer.toHexString(0xFF & byteArray[i]));
		}

		return md5StrBuff.toString();
	}
	
	public static void main(String[] args) {
		TestMD5 t = new TestMD5();
		String a =  t.getMD5Str("cnwugen" + "bA4HDBqF");
		System.out.println(a);
		System.out.println(t.getMD5Str(a));
		
		System.out.println(t.getMD5Str("123456"));
	}
}