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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