JAVA-3DES对称加解密工具（不依赖第三方库）

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;public class EncryptUtil {// 密钥public static final String ENCRYPT_KEY = "ABCD1234";// 定义加密算法，可用DES，DESede，Blowfishprivate static final String ALGORITHM_DESDE = "DESede";public static void main(String[] args) {// 加密String encPassword = desEdeEncoder("123456", EncryptUtil.ENCRYPT_KEY);System.out.println(encPassword);// 解密String desPassword = desEdeDecoder(encPassword, EncryptUtil.ENCRYPT_KEY);System.out.println(desPassword);}public static boolean isEmpty(String str) {return null == str || str.trim().length() == 0;}/*** 3DES加密** @param src* @param key* @return*/public static String desEdeEncoder(String src, String key) {byte[] bytes = null;try {SecretKeySpec secretKey = new SecretKeySpec(build3DesKey(key), ALGORITHM_DESDE);Cipher cipher = Cipher.getInstance(ALGORITHM_DESDE);cipher.init(Cipher.ENCRYPT_MODE, secretKey);bytes = cipher.doFinal(src.getBytes(StandardCharsets.UTF_8));} catch (Exception e) {throw new RuntimeException(e);}return byte2HexStr(bytes);}/*** 3DES 解密** @param dest* @param key* @return*/public static String desEdeDecoder(String dest, String key) {String desStr;try {SecretKeySpec secretKey = new SecretKeySpec(build3DesKey(key), ALGORITHM_DESDE);Cipher cipher = Cipher.getInstance(ALGORITHM_DESDE);cipher.init(Cipher.DECRYPT_MODE, secretKey);byte[] bytes = cipher.doFinal(str2ByteArray(dest));desStr = new String(bytes, StandardCharsets.UTF_8);} catch (Exception e) {throw new RuntimeException(e);}return desStr;}public static String md5Digest(String src) throws NoSuchAlgorithmException {MessageDigest md5 = MessageDigest.getInstance("MD5");byte[] bytes = md5.digest(src.getBytes(StandardCharsets.UTF_8));return byte2HexStr(bytes);}private static byte[] build3DesKey(String keyStr) {byte[] bytes = new byte[24];byte[] temp = keyStr.getBytes(StandardCharsets.UTF_8);System.arraycopy(temp, 0, bytes, 0, Math.min(bytes.length, temp.length));return bytes;}private static byte[] str2ByteArray(String str) {int byteArrayLength = str.length() / 2;byte[] bytes = new byte[byteArrayLength];for (int i = 0; i < byteArrayLength; i++) {byte b0 = (byte) Integer.valueOf(str.substring(i * 2, i * 2 + 2), 16).intValue();bytes[i] = b0;}return bytes;}private static String byte2HexStr(byte[] bytes) {StringBuilder sbf = new StringBuilder();for (byte aByte : bytes) {String s = Integer.toHexString(aByte & 0xFF);if (s.length() == 1) {sbf.append("0");}sbf.append(s.toUpperCase());}return sbf.toString();}}