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;
	}
}