学习日志：对DB.properties文件使用DES加密，通过重写PropertyPlaceholderConfigurer类对properties文件进行解密，然后Mybatis读取spring DataResource。
配置文件如下：
classpath:DB.properties
PropertyPlaceholderConfigurer 重写如下：
public class MyPropertyLoader extends PropertyPlaceholderConfigurer {
@Override
protected void processProperties(ConfigurableListableBeanFactory beanFactoryToProcess, Properties props)
throws BeansException {
String url = (String) props.getProperty("url");
String username = props.getProperty("username");
String password = props.getProperty("password");
String pw = PassWord.getPassWord();
try {
url = MyEncrypt.decryptString(url,pw);
username = MyEncrypt.decryptString(username,pw);
password = MyEncrypt.decryptString(password,pw);
props.setProperty("url", url);
props.setProperty("username", username);
props.setProperty("password", password);
} catch (Exception e) {
e.printStackTrace();
}
//props.get(arg0)
super.processProperties(beanFactoryToProcess, props);
}
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