MD5Util.java

package com.hackerchai.rapid.udpService;

/**
 * Created by hackerchai on 15-6-13.
 */
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
/**
 * @author 虫儿飞({@link www.xcoder.cn})
 */
public class MD5Util {

    private static final char HEX_DIGITS[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
            'A', 'B', 'C', 'D', 'E', 'F' };
    public static String toHexString(byte[] b) {
        //String to  byte
        StringBuilder sb = new StringBuilder(b.length * 2);
        for (int i = 0; i < b.length; i++) {
            sb.append(HEX_DIGITS[(b[i] & 0xf0) >>> 4]);
            sb.append(HEX_DIGITS[b[i] & 0x0f]);
        }
        return sb.toString();
    }
    public static String MD5(String s) {
        try {
            // Create MD5 Hash
            MessageDigest digest = java.security.MessageDigest.getInstance("MD5");
            digest.update(s.getBytes());
            byte messageDigest[] = digest.digest();

            return toHexString(messageDigest);
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }

        return "";
    }
}