可以将上下文(配置文件)中的属性值放在另一个单独的标准java Properties文件中去。在从上图中,我们看到PropertyPlaceholderConfigurer实现了三个bean生命周期的接口:BeanFactoryAware & BeanNameAware ...
可以将上下文(配置文件)中的属性值放在另一个单独的标准java Properties文件中去。在
从上图中,我们看到PropertyPlaceholderConfigurer实现了三个bean生命周期的接口:BeanFactoryAware & BeanNameAware & BeanFactoryPostProcessor。关于spring bean的生命周期,可以参考这里http://blog.csdn.net/gjb724332682/article/details/46767463。
PropertyResourceConfigurer.postProcessBeanFactory()将properties文件中的属性进行merge,convert,最后调用PropertyPlaceholderConfigurer.processProperties()完成遍历bean定义替换属性占位符。
例子:
<bean id="propertyConfigurer" ><property name="location"><span > </span><value>WEB-INF/conf/xx.properties</value></property><property name="fileEncoding"><span > </span><value>UTF-8</value></property></bean><!--当然也可以引入多个属性文件,如: --><bean id="propertyConfigurer" ><property name="locations"><span > </span><list><span > </span><value>/WEB-INF/mail.properties</value><span > </span><value>classpath:conf/sqlmap/jdbc.properties</value><span > </span></list></property></bean>
<bean id="econsoleDS" destroy-method="close"><property name="driverClass"><span > </span><value>${jdbc.driverClassName}</value></property><property name="jdbcUrl"><span > </span><value>${jdbc.url}</value></property><property name="user"><span > </span><value>${jdbc.username}</value></property><property name="password"><span > </span><value>${jdbc.password}</value></property></bean>
除此之外,我们还可以扩展自这个类,用来诸如加解密配置信息等操作。如下:
import java.util.Properties;import org.springframework.beans.BeansException;import org.springframework.beans.factory.BeanInitializationException;import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;import org.springframework.beans.factory.config.PropertyPlaceholderConfigurer;import com.xxx.util.AESUtils;public class DecryptPropertyPlaceholderConfigurer extends PropertyPlaceholderConfigurer { private String key = "xxxxxx"; @Override protected void processProperties( ConfigurableListableBeanFactory beanFactory, Properties props) throws BeansException { try { String driverClassName = props.getProperty("driverClassName"); if (driverClassName != null) { props.setProperty("driverClassName", AESUtils.aesDecrypt(driverClassName, key)); } String url = props.getProperty("url"); if (url != null) { props.setProperty("url", AESUtils.aesDecrypt(url, key)); } String username = props.getProperty("username"); if (username != null) { props.setProperty("username", AESUtils.aesDecrypt(username, key)); } String password = props.getProperty("password"); if (password != null) { props.setProperty("password", AESUtils.aesDecrypt(password, key)); } super.processProperties(beanFactory, props); } catch (Exception e) { e.printStackTrace(); throw new BeanInitializationException(e.getMessage()); } }}
重写processProperties方法就可以。
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原标题:org.springframework.beans.factory.config.PropertyPlaceholderConfigurer
关键词:Spring
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