java实现MD5算法

import java.security.MessageDigest;

/** 加密工具*

• @author 刘彦青
  *
  **/
  public class EncryptUtil {

    /** MD5加密
     * 
     * @param jiami
     *            源字符串
     * @return 加密后的字符串 */
    public final static String md5(String jiami) {
        char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
        try {
            byte[] btInput = jiami.getBytes();
            MessageDigest mdInst = MessageDigest.getInstance("MD5");
            mdInst.update(btInput);
            byte[] md = mdInst.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) {
            throw new RuntimeException(e);
        }
    }

    private EncryptUtil() {
        // 禁止实例化
    }
}

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