在Java中DES加密/解密的实现[工具类]

使用前需导入Crypto包：

<dependency><groupId>org.springframework.security</groupId><artifactId>spring-security-crypto</artifactId><version>5.2.1.RELEASE</version></dependency>

Utils工具类：

import sun.misc.BASE64Decoder;import sun.misc.BASE64Encoder;import javax.crypto.Cipher;import javax.crypto.KeyGenerator;import javax.crypto.NoSuchPaddingException;import java.security.InvalidKeyException;import java.security.Key;import java.security.NoSuchAlgorithmException;import java.security.SecureRandom;/*** @author Piconjo* @date /6/1 20:15*/public class DesUtil {private static DesUtil instance;private Key key;private Cipher encryptCipher;private Cipher decryptCipher;// 密钥private static final String SECRET_KEY="iloveumybaby";protected DesUtil() {}protected DesUtil(String strKey) {key = setKey(strKey);try {encryptCipher = Cipher.getInstance("DES");encryptCipher.init(Cipher.ENCRYPT_MODE, key);decryptCipher = Cipher.getInstance("DES");decryptCipher.init(Cipher.DECRYPT_MODE, key);} catch (NoSuchAlgorithmException e) {e.printStackTrace();} catch (NoSuchPaddingException e) {e.printStackTrace();} catch (InvalidKeyException e) {e.printStackTrace();}}// 初始化实例public static DesUtil getInstance() {if (instance == null) {instance = new DesUtil(SECRET_KEY);}return instance;}// 根据参数生成KEYprivate Key setKey(String strKey) {try {KeyGenerator _generator = KeyGenerator.getInstance("DES");_generator.init(new SecureRandom(strKey.getBytes()));return _generator.generateKey();} catch (Exception e) {e.printStackTrace();}return null;}// 加密 - String明文输入 String密文输出public String setEncString(String strMing) {BASE64Encoder base64en = new BASE64Encoder();try {byte[] byteMing = strMing.getBytes("UTF-8");byte[] byteMi = getEncCode(byteMing);return base64en.encode(byteMi);} catch (Exception e) {e.printStackTrace();}return null;}// 加密 - byte[]明文输入 byte[]密文输出private byte[] getEncCode(byte[] byteS) {byte[] byteFina = null;try {byteFina = encryptCipher.doFinal(byteS);} catch (Exception e) {e.printStackTrace();}return byteFina;}// 解密 - String密文输入 String明文输出public String setDesString(String strMi) {BASE64Decoder base64De = new BASE64Decoder();try {byte[] byteMi = base64De.decodeBuffer(strMi);byte[] byteMing = getDesCode(byteMi);return new String(byteMing, "UTF-8");} catch (Exception e) {e.printStackTrace();}return null;}// 解密 - byte[]密文输入 byte[]明文输出private byte[] getDesCode(byte[] byteD) {byte[] byteFina = null;try {byteFina = decryptCipher.doFinal(byteD);} catch (Exception e) {e.printStackTrace();}return byteFina;}// 单测public static void main(String[] args) {DesUtil desUtil = DesUtil.getInstance();String code= dtDesUtil.setEncString("111111@");System.out.println(code);System.out.println(dtDesUtil.setDesString(code));}}

使用须知：

使用前 调用DesUtil的getInstance()方法 生成DesUtil类的实例

然后再使用返回的DesUtil对象进行密码加密解密操作

不能直接调用DesUtil里的方法进行加密解密 否则会报空指针异常