Question

如何在Spring容器中加载自定义的配置文件

Answer 1

自定义配置文件
配置文件名为：project.properties，内容如下：

[html] view plain copy
# 是否开启逻辑删除
project_del.filter.on=false
project_domain=

修改Spring配置文件
之前代码：

[html] view plain copy
<beanidbeanid="propertyConfigurer"
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<propertynamepropertyname="locations">
<list>
<value>classpath:dbinfo.properties</value>
</list>
</property>
</bean>

修改后的配置文件

[html] view plain copy
<beanidbeanid="propertyConfigurer"
class="com.hisun.core.util.CustomizedPropertyPlaceholderConfigurer">
<propertynamepropertyname="locations">
<list>
<value>classpath:dbinfo.properties</value>
<value>classpath:project.properties</value>
</list>
</property>
</bean>

加入了classpath:project.properties，其为自定义的配置文件
将PropertyPlaceholderConfigurer类修改为自定义类CustomizedPropertyPlaceholderConfigurer,
PropertyPlaceholderConfigurer类的具体作用可以查资料这块儿不做详细介绍
注意下：这个configurer类获取的是所有properties的属性map,如果希望处理某个properties文件，需要在properties中
做一个命名区别，然后在加载的时候，根据key的前缀，进行获取。
定义CustomizedPropertyPlaceholderConfigurer类
类的具体内容为下，

[java] view plain copy
importjava.util.HashMap;
importjava.util.Map;
importjava.util.Properties;

importorg.springframework.beans.BeansException;
importorg.springframework.beans.factory.config.ConfigurableListableBeanFactory;
importorg.springframework.beans.factory.config.PropertyPlaceholderConfigurer;

publicclass CustomizedPropertyPlaceholderConfigurer extendsPropertyPlaceholderConfigurer {
privatestatic Map ctxPropertiesMap;

@Override
protectedvoid processProperties(ConfigurableListableBeanFactory beanFactoryToProcess,
Properties props)throws BeansException {
super.processProperties(beanFactoryToProcess, props);
ctxPropertiesMap =new HashMap();
for(Object key : props.keySet()) {
String keyStr = key.toString();
if(keyStr.startsWith("project_")){
String value = props.getProperty(keyStr);
ctxPropertiesMap.put(keyStr, value);
}

}
}
publicstatic Object getContextProperty(String name) {
returnctxPropertiesMap.get(name);
}
}

定义获取配置文件中值的类SpringPropertiesUtil
类的具体内容如下：

[java] view plain copy
importorg.springframework.beans.BeansException;
importorg.springframework.context.ApplicationContext;
importorg.springframework.context.ApplicationContextAware;
importorg.springframework.stereotype.Component;

/**
* Spring-PropertiesUtil工具类 -获取属性值
*
*/
@Component
publicclass SpringPropertiesUtil implementsApplicationContextAware {
publicstatic final String KEY = "propertyConfigurer";
privatestatic ApplicationContext applicationContext;

publicvoid setApplicationContext(ApplicationContext applicationContext)
throwsBeansException {
SpringPropertiesUtil.applicationContext = applicationContext;
}

publicstatic ApplicationContext getApplicationContext() {
returnapplicationContext;
}

/**
* 获取配置文件中的内容
*
* @param keyName
* @return
*/
publicstatic String parseStr(String keyName) {
CustomizedPropertyPlaceholderConfigurer cp = (CustomizedPropertyPlaceholderConfigurer) applicationContext
.getBean(KEY);
returncp.getContextProperty(keyName).toString();
}

/**
* 获取配置文件中的内容
*
* @param keyName
* @return
*/
publicstatic int parseInt(String keyName) {
CustomizedPropertyPlaceholderConfigurer cp = (CustomizedPropertyPlaceholderConfigurer) applicationContext
.getBean(KEY);
returnInteger.parseInt(cp.getContextProperty(keyName).toString());
}

/**
* 获取配置文件中的内容
*
* @param keyName
* @return
*/
publicstatic double parseDouble(String keyName) {
CustomizedPropertyPlaceholderConfigurer cp = (CustomizedPropertyPlaceholderConfigurer) applicationContext
.getBean(KEY);
returnDouble.parseDouble(cp.getContextProperty(keyName).toString());
}
}

这样，在项目当中就能够方便快速的获取properties文件中配置的参数
如SpringPropertiesUtil.parseStr(“content”)