Java实现SHA1摘要算法

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import java.io.UnsupportedEncodingException;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;public class ShaUtil {private static char[] CHARARRAY = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e','f' };public static String toSHA1(String str) {if (null == str || 0 == str.length()) {return null;}try {// 指定sha1算法MessageDigest digest = MessageDigest.getInstance("SHA1");digest.update(str.getBytes("UTF-8"));byte[] md = digest.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++] = CHARARRAY[byte0 >>> 4 & 0xf];buf[k++] = CHARARRAY[byte0 & 0xf];}return new String(buf);} catch (NoSuchAlgorithmException e) {e.printStackTrace();} catch (UnsupportedEncodingException e) {// TODO Auto-generated catch blocke.printStackTrace();}return null;}}

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