JAVA sha1

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package org.cold.util;import java.security.MessageDigest;public class Sha1 {    public static String getSha1(String str){        if (null == str || 0 == str.length()){            return null;        }        char[] hexDigits = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',                 'a', 'b', 'c', 'd', 'e', 'f'};        try {            MessageDigest mdTemp = MessageDigest.getInstance("SHA1");            mdTemp.update(str.getBytes("UTF-8"));            byte[] md = mdTemp.digest();            int j = md.length;            char[] buf = new char[j * 2];            int k = 0;            for (int i = 0; i < j; i++) {                byte byte0 = md[i];                buf[k++] = hexDigits[byte0 >>> 4 & 0xf];                buf[k++] = hexDigits[byte0 & 0xf];            }            return new String(buf);        } catch (Exception e) {            e.printStackTrace();            return null;        }     }}

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