SSM 对数据库配置信息进行DES加密

灰太狼 2021-10-18 07:31 354阅读 0赞

1.编写加密,解密工具类

import java.security.Key;
    import java.security.SecureRandom;
    
    import javax.crypto.Cipher;
    import javax.crypto.KeyGenerator;
    
    import sun.misc.BASE64Decoder;
    import sun.misc.BASE64Encoder;
    
    /**
     * DES是一种对称加密算法，所谓对称加密算法即：加密和解密使用相同密钥的算法。
     * 
     */
    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);
    			// 运用SHA1安全策略
    			SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
    			// 设置上密钥种子
    			secureRandom.setSeed(KEY_STR.getBytes());
    			// 初始化基于SHA1的算法对象
    			generator.init(secureRandom);
    			// 生成密钥对象
    			key = generator.generateKey();
    			generator = null;
    		} catch (Exception e) {
    			throw new RuntimeException(e);
    		}
    	}
    
    	/**
    	 * 获取加密后的信息
    	 * 
    	 * @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好的String并返回
    			return base64encoder.encode(doFinal);
    		} catch (Exception e) {
    			// TODO: handle exception
    			throw new RuntimeException(e);
    		}
    	}
    
    	/**
    	 * 获取解密之后的信息
    	 * 
    	 * @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);
    			// 返回解密之后的信息
    			return new String(doFinal, CHARSETNAME);
    		} catch (Exception e) {
    			// TODO: handle exception
    			throw new RuntimeException(e);
    		}
    	}
    
    	/**
    	 * 测试
    	 * 
    	 * @param args
    	 */
    	public static void main(String[] args) {
            //测试加密
    		System.out.println(getEncryptString("root"));
            //测试解密
    		System.out.println(getDecryptString(getEncryptString("root")));
    	}
    
    }

2.编写解密配置类

import org.springframework.beans.factory.config.PropertyPlaceholderConfigurer;
    
    public class EncryptPropertyPlaceholderConfigurer extends PropertyPlaceholderConfigurer {
    	
    	
    	// 需要加密的字段数组
    	private String[] encryptPropNames = { "jdbc.username", "jdbc.password" };
    
    	/**
    	 * 对关键的属性进行转换
    	 */
    	@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) {
    		// 若等于需要加密的field，则进行加密
    		for (String encryptpropertyName : encryptPropNames) {
    			if (encryptpropertyName.equals(propertyName))
    				return true;
    		}
    		return false;
    	}

3.编写配置文件,把刚才加密的数据写到配置文件中

jdbc.driver=com.mysql.jdbc.Driver
    jdbc.url=jdbc:mysql://localhost:3306/o2o?useUnicode=true&characterEncoding=utf8
    jdbc.username=WnplV/ietfQ=
    jdbc.password=WnplV/ietfQ=
    #jdbc.username=root
    #jdbc.password=root

4.在加载数据库配置的时候进行解密操作

<bean id="placeholderConfigurer"
    		class="com.imooc.o2o.common.util.EncryptPropertyPlaceholderConfigurer">
    		<property name="locations">
    			<array>
    				<value>classpath*:jdbc.properties</value>
    			</array>
    		</property>
    		<property name="fileEncoding" value="UTF-8"></property>
    	</bean>
    	
    	<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
    		destroy-method="close">
    		<property name="driverClass" value="${jdbc.driver}" />
    		<property name="jdbcUrl" value="${jdbc.url}" />
    		<property name="user" value="${jdbc.username}" />
    		<property name="password" value="${jdbc.password}" />
    		
    		<property name="maxPoolSize" value="30" />
    		<property name="minPoolSize" value="10" />
    		
    		<property name="autoCommitOnClose" value="false" />
    		
    		<property name="checkoutTimeout" value="10000" />
    		
    		<property name="acquireRetryAttempts" value="2" />
    	</bean>