Spring注入自定义的从数据库中读取的Properties

最新推荐文章于 2024-10-15 19:10:55 发布

原创最新推荐文章于 2024-10-15 19:10:55 发布 · 761 阅读

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#spring #FactoryBean #从数据库中读取Properties

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本文深入探讨了Spring框架的配置机制，包括注解驱动、组件扫描、系统配置属性的注入等核心概念，提供了实例代码解析。

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xmlns:context="http://www.springframework.org/schema/context"
 xsi:schemaLocation="http://www.springframework.org/schema/beans
 http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
 http://www.springframework.org/schema/context
 http://www.springframework.org/schema/context/spring-context-3.0.xsd ">
    <!-- bean annotation driven -->
    <context:annotation-config />
    <context:component-scan base-package="com.*.*">
    </context:component-scan>
    <bean id="configProperties" class="*.*.SystemConfigProperties "/>

    <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PreferencesPlaceholderConfigurer">
        <property name="properties" ref="configProperties" />
    </bean>    
</beans>

或者是如下配置

<bean id="systemConfig" class="*.*.PropertiesFactoryBean"/>
	
<bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="ignoreUnresolvablePlaceholders" value="true"/>
        <property name="propertiesArray">
	       	<array>
	  		<ref local="systemConfig"/>
	  	</array> 
        </property> 
</bean>

public class SystemConfigProperties implements FactoryBean<Properties> {
	
	@Override
	public Properties getObject() throws Exception {
		 Properties props = new Properties();
		 //这里这些值可以从数据库中去读取
		 props.setProperty("ftp.url", "192.168.2.85");
		 props.setProperty("ftp.port", "2121");
 		 props.setProperty("ftp.username", "admin");
		 props.setProperty("ftp.userpwd", "admin");
		 props.setProperty("ftp.terminalIssuePath", "/terminalIssue/");
 		 return props;
	}

 	@Override
	public Class<Properties> getObjectType() {
		 return Properties.class;
 	}

	 @Override
	 public boolean isSingleton() {
		return true;
	 }

}