对账号密码加密类

DESUtil

/**
 * 对账号密码进行DES加密
 */
public class DESUtil {

    private static Key key;
    //设置密钥key
    private static String KEY_STR = "myKey";
    private static String CHARSETNAME = "UTF-8";
    private static String ALGORITHM = "DES";

    static {
        try {
            // 生成DES算法对象
            KeyGenerator generator = KeyGenerator.getInstance(ALGORITHM);
            // 运行SHA1安全策略
            SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
            // 设置密钥种子
            secureRandom.setSeed(KEY_STR.getBytes());
            // 初始化基于SHA1算法对象
            generator.init(secureRandom);
            // 生成密钥
            key = generator.generateKey();
            generator = null;
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    /**
     * 获取加密信息
     * @param str
     * @return
     */
    public static String getEncryptString(String str) {
        //基于BASE64编码，接收byte[]并转换成String
        BASE64Encoder base64encoder = new BASE64Encoder();
        try {
            //按UTF8编码
            byte[] bytes = str.getBytes(CHARSETNAME);
            //获取加密对象
            Cipher cipher = Cipher.getInstance(ALGORITHM);
            //初始化密码信息
            cipher.init(Cipher.ENCRYPT_MODE, key);
            //加密
            byte[] doFinal = cipher.doFinal(bytes);
            //byte[]to encode获取String并返回
            return base64encoder.encode(doFinal);
        } catch (Exception e) {
            // TODO: handle exception
            throw new RuntimeException(e);
        }
    }

    /**
     * 获取解密后的信息
     * @param str
     * @return
     */
    public static String getDecryptString(String str) {
        //基于BASE64编码，接收byte[]并转换成String
        BASE64Decoder base64decoder = new BASE64Decoder();
        try {
            //将字符串decode成byte[]
            byte[] bytes = base64decoder.decodeBuffer(str);
            //获取解密对象
            Cipher cipher = Cipher.getInstance(ALGORITHM);
            //初始化解密信息
            cipher.init(Cipher.DECRYPT_MODE, key);
            //解密
            byte[] doFinal = cipher.doFinal(bytes);
            //返回解密后的信息
            return new String(doFinal, CHARSETNAME);
        } catch (Exception e) {
            // TODO: handle exception
            throw new RuntimeException(e);
        }
    }

    /**
     * 验证加密和解密的方法是否正确
     * 得到加密后的值，以便在jdbc.properties文件中使用
     * @param args
     */
    public static void main(String[] args) {
        System.out.println(getEncryptString("root"));
        System.out.println(getEncryptString("123456"));
        System.out.println(getDecryptString("WnplV/ietfQ="));
        System.out.println(getDecryptString("QAHlVoUc49w="));
    }
}

EncryptPropertyPlaceholderConfigurer Tomcat加载时调用对已经加密的字段进行解密

import org.springframework.beans.factory.config.PropertyPlaceholderConfigurer;

/**
 * Tomcat加载时调用对已经加密的字段进行解密
 */
public class EncryptPropertyPlaceholderConfigurer extends PropertyPlaceholderConfigurer {
    //需要加密的字段数组
    private String[] encryptPropNames = { "jdbc.username", "jdbc.password" };

    /**
     * 对关键属性进行转换
     * @param propertyName
     * @param propertyValue
     * @return
     */
    @Override
    protected String convertProperty(String propertyName, String propertyValue) {
        if (isEncryptProp(propertyName)) {
            //对已加密的字段进行解密工作
            String decryptValue = DESUtil.getDecryptString(propertyValue);
            return decryptValue;
        } else {
            return propertyValue;
        }
    }

    /**
     * 该属性是否已加密
     * @param propertyName
     * @return
     */
    private boolean isEncryptProp(String propertyName) {
        for (String encryptpropertyName : encryptPropNames) {
            if (encryptpropertyName.equals(propertyName))
                return true;
        }
        return false;
    }
}

得到加密后的值，以便在jdbc.properties文件中将需要修改的明文改成密文

然后在配置整合mybatis过程中将原来的

<!-- 1.配置数据库相关参数properties的属性：${url} -->
   <context:property-placeholder location="classpath:jdbc.properties"/>

替换成：

<bean class="com.imooc.myo2o.util.EncryptPropertyPlaceholderConfigurer" >
        <property name="locations">
            <list>
            	<!--以下是需要解密的文件-->
                <value>classpath:jdbc.properties</value>
                <value>classpath:redis.properties</value>
            </list>
        </property>
        <property name="fileEncoding" value="UTF-8"></property>
    </bean>