Md5.java

package forezp.com.douyalibrary.utils;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/**
 *
 */
public class Md5 {
    /**
     * Constructs the MD5 object and sets the string whose MD5 is to be
     * computed.
     *
     * @param inStr
     *            the <code>String</code> whose MD5 is to be computed
     */


    public final static String COMMON_KEY="zhongzhuoxin#@!321";
    public Md5() {

    }

    public final static String str2MD5(String inStr) {
        char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
                'a', 'b', 'c', 'd', 'e', 'f' };
        try {
            byte[] strTemp = inStr.getBytes("UTF-8");
            MessageDigest mdTemp = MessageDigest.getInstance("MD5");
            mdTemp.update(strTemp);
            byte[] md = mdTemp.digest();
            int j = md.length;
            char str[] = new char[j * 2];
            int k = 0;
            for (int i = 0; i < j; i++) {
                byte byte0 = md[i];
                str[k++] = hexDigits[byte0 >>> 4 & 0xf];
                str[k++] = hexDigits[byte0 & 0xf];
            }
            return new String(str);
        } catch (Exception e) {
            return null;
        }
    }




    //--MD5
    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 AndroidMd5(String s) {
        try {
            // Create MD5 Hash
            MessageDigest digest = MessageDigest
                    .getInstance("MD5");
            digest.update(s.getBytes());
            byte messageDigest[] = digest.digest();

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

        return "";
    }


}