数据库连接加密

在实际项目中，经常需要对数据库连接池的相关配置加密，比如说数据库的密码，下面介绍两种加密和解密方法

一，重写数据库连接池

import org.apache.commons.codec.binary.Base64;
import org.apache.commons.dbcp.BasicDataSource;

import java.sql.SQLFeatureNotSupportedException;
import java.util.logging.Logger;

/**
 * @author:lyy
 * @Date: 2016/2/6 12:16
 * @version:
 * @Description:
 */
public class UnisConnection extends BasicDataSource {
    private String salt = "unis";
    private String mix = "Th";

    public UnisConnection() {
        super();
    }

    @Override
    public void setPassword(String password){
        try{
            this.password = decodeUnisPassword(password);
        }catch(Exception e){

        }
    }

    /**
     * Return the parent Logger of all the Loggers used by this data source. This
     * should be the Logger farthest from the root Logger that is
     * still an ancestor of all of the Loggers used by this data source. Configuring
     * this Logger will affect all of the log messages generated by the data source.
     * In the worst case, this may be the root Logger.
     *
     * @return the parent Logger for this data source
     * @throws SQLFeatureNotSupportedException if the data source does not use
     *                                         {@code java.util.logging}
     * @since 1.7
     */
    @Override
    public Logger getParentLogger() throws SQLFeatureNotSupportedException {
        return null;
    }

    /**
    * @author: lyy
    * @Time: 2016/2/6 13:58
    * @Descrption: 根据密码串，反编码出真正的数据库密码
    * @param  encodeStr 密码串
    * @return 原始密码串
    * @throws
    */
    private String decodeUnisPassword(String encodeStr){
        String temp = new String(Base64.decodeBase64(encodeStr));
        temp = temp.substring(mix.length());
        temp = new String(Base64.decodeBase64(temp));
        return temp.substring(salt.length());
    }
}

然后在配置连接池时，进行如下配置

<bean id="dataSource" class="com.unisits.zngkpt.data.userprivrmandata.bojo.UnisConnection"  destroy-method="close">
    <property name="driverClassName" value="${driverClasss}"/>
    <property name="url" value="${jdbcUrl}"/>
    <property name="username" value="${loginusername}"/>
    <property name="password" value="${password}"/>
    <!-- 初始化连接大小 -->
    <property name="initialSize" value="${initialSize}"></property>
    <!-- 连接池最大数量 -->
    <property name="maxActive" value="${maxActive}"></property>
    <!-- 连接池最大空闲 -->
    <property name="maxIdle" value="${maxIdle}"></property>
    <!-- 连接池最小空闲 -->
    <property name="minIdle" value="${minIdle}"></property>
    <!-- 获取连接最大等待时间 -->
    <property name="maxWait" value="${maxWait}"></property>
</bean>

具体的属性为：

loginusername=sa
password=VGhkVzVwYzNSb2RXNXBjdz09

二，重写PropertyPlaceholderConfiger类

详见精通spring4.0   --< 6.3.2