SHA1 加密

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

public class SHA1 {

  public static String sha1Encode(String str) {
    MessageDigest sha1;
    try {
      sha1 = MessageDigest.getInstance("SHA1");
      byte[] bt = str.getBytes();
      sha1.update(bt);
      return bytes2Hex(sha1.digest());
    } catch (NoSuchAlgorithmException e) {
      e.printStackTrace();
    }
    return null;
  }

  private static String bytes2Hex(byte[] bts) {
    String des = "";
    String tmp = null;
    for (int i = 0; i < bts.length; i++) {
      tmp = (Integer.toHexString(bts[i] & 0xFF));
      if (tmp.length() == 1) {
        des += "0";
      }
      des += tmp;
    }
    return des;
  }
}