对信息的加密是用的DES(具体加密方法的选用,可自行选择)
- public class DESUtil {
- public static final String KEY_STRING = "farawayfrom";//生成密钥的字符串
- static Key key;
- /**
- * 根据参数生成KEY
- *
- * @param strKey
- */
- public static void getKey(String strKey) {
- try {
- KeyGenerator _generator = KeyGenerator.getInstance("DES");
- _generator.init(new SecureRandom(strKey.getBytes()));
- key = _generator.generateKey();
- _generator = null;
- } catch (Exception e) {
- e.printStackTrace();
- }
- }
- /**
- * 加密String明文输入,String密文输出
- *
- * @param strMing
- * @return
- */
- public static String getEncString(String strMing) {
- DESUtil.getKey(KEY_STRING);// 生成密匙
- byte[] byteMi = null;
- byte[] byteMing = null;
- String strMi = "";
- BASE64Encoder base64en = new BASE64Encoder();
- try {
- byteMing = strMing.getBytes("UTF8");
- byteMi = getEncCode(byteMing);
- strMi = base64en.encode(byteMi);
- } catch (Exception e) {
- e.printStackTrace();
- } finally {
- base64en = null;
- byteMing = null;
- byteMi = null;
- }
- return strMi;
- }
- /**
- * 解密 以String密文输入,String明文输出
- *
- * @param strMi
- * @return
- */
- public static String getDesString(String strMi) {
- DESUtil.getKey(KEY_STRING);// 生成密匙
- BASE64Decoder base64De = new BASE64Decoder();
- byte[] byteMing = null;
- byte[] byteMi = null;
- String strMing = "";
- try {
- byteMi = base64De.decodeBuffer(strMi);
- byteMing = getDesCode(byteMi);
- strMing = new String(byteMing, "UTF8");
- } catch (Exception e) {
- e.printStackTrace();
- } finally {
- base64De = null;
- byteMing = null;
- byteMi = null;
- }
- return strMing;
- }
- /**
- * 加密以byte[]明文输入,byte[]密文输出
- *
- * @param byteS
- * @return
- */
- private static byte[] getEncCode(byte[] byteS) {
- byte[] byteFina = null;
- Cipher cipher;
- try {
- cipher = Cipher.getInstance("DES");
- cipher.init(Cipher.ENCRYPT_MODE, key);
- byteFina = cipher.doFinal(byteS);
- } catch (Exception e) {
- e.printStackTrace();
- } finally {
- cipher = null;
- }
- return byteFina;
- }
- /**
- * 解密以byte[]密文输入,以byte[]明文输出
- *
- * @param byteD
- * @return
- */
- private static byte[] getDesCode(byte[] byteD) {
- Cipher cipher;
- byte[] byteFina = null;
- try {
- cipher = Cipher.getInstance("DES");
- cipher.init(Cipher.DECRYPT_MODE, key);
- byteFina = cipher.doFinal(byteD);
- } catch (Exception e) {
- e.printStackTrace();
- } finally {
- cipher = null;
- }
- return byteFina;
- }
- public static void main(String[] args) {
- String strEnc = DESUtil.getEncString("yanfa");// 加密字符串,返回String的密文
- System.out.println(strEnc);
- String strDes = DESUtil.getDesString("kSElf8soueY=");// 把String 类型的密文解密
- System.out.println(strDes);
- }
- }
这里的密钥字符串已经在类中写死,如果觉得不安全可以自己将密钥用MD5加密后写到文件中使用。
spring配置文件部分内容如下:(注意红色的地方正是解密的类)
- <!-- 属性文件读入 -->
- <bean id="propertyConfigurer"
- [color=red]class="com.dt.util.MyConfigurer"[/color]>
- <property name="locations">
- <list>
- <value>classpath:conf/jdbc.properties</value>
- </list>
- </property>
- </bean>
解密类如下:
- public class MyConfigurer extends PropertyPlaceholderConfigurer
- {
- @Override
- protected void processProperties(
- ConfigurableListableBeanFactory beanFactory, Properties props)
- throws BeansException {
- System.out.println("MyConfigurer!");
- String UserName = props.getProperty("jdbc.UserName");
- if (UserName != null ) {
- props.setProperty("jdbc.UserName", DESUtil.getDesString(UserName));
- }
- String password = props.getProperty("jdbc.PassWord");
- if (password != null ) {
- props.setProperty("jdbc.PassWord", DESUtil.getDesString(password));
- }
- super.processProperties(beanFactory, props);
- }
- }
转载于:https://blog.51cto.com/magintursh/559355