基于spring 4.0.9

你的spring配置文件

http://www.springframework.org/schema/util
http://www.springframework.org/schema/util/spring-util.xsd

spring-beans.jar - /META-INF/spring.schemas

找到语法校验文件

http\://www.springframework.org/schema/util/spring-util-4.0.xsd=org/springframework/beans/factory/xml/spring-util-4.0.xsd
http\://www.springframework.org/schema/util/spring-util.xsd=org/springframework/beans/factory/xml/spring-util-4.0.xsd

spring-beans.jar - /META-INF/spring.handlers

找到命名空间对应的实现类

http\://www.springframework.org/schema/util=org.springframework.beans.factory.xml.UtilNamespaceHandler

org.springframework.beans.factory.xml.UtilNamespaceHandler

@Override
public void init() {registerBeanDefinitionParser("constant", new ConstantBeanDefinitionParser());registerBeanDefinitionParser("property-path", new PropertyPathBeanDefinitionParser());registerBeanDefinitionParser("list", new ListBeanDefinitionParser());registerBeanDefinitionParser("set", new SetBeanDefinitionParser());registerBeanDefinitionParser("map", new MapBeanDefinitionParser());registerBeanDefinitionParser("properties", new PropertiesBeanDefinitionParser()); // 重点
}

org.springframework.beans.factory.xml.UtilNamespaceHandler.PropertiesBeanDefinitionParser

private static class PropertiesBeanDefinitionParser extends AbstractSimpleBeanDefinitionParser {@Overrideprotected Class<?> getBeanClass(Element element) {return PropertiesFactoryBean.class; // 重点}
}

org.springframework.beans.factory.config.PropertiesFactoryBean

注意它实现了FactoryBean<Properties>、InitializingBean两个接口，就要实现这两个方法

@Override
public final void afterPropertiesSet() throws IOException {if (this.singleton) {this.singletonInstance = createProperties(); // 重点}
}@Override
public final Properties getObject() throws IOException {if (this.singleton) {return this.singletonInstance;} else {return createProperties(); // 重点}
}

Properties org.springframework.beans.factory.config.PropertiesFactoryBean.createProperties()

protected Properties createProperties() throws IOException {return mergeProperties(); // 直接调用父类的方法
}

Properties org.springframework.core.io.support.PropertiesLoaderSupport.mergeProperties() 中

protected Properties mergeProperties() throws IOException {Properties result = new Properties();if (this.localOverride) {// Load properties from file upfront, to let local properties override.loadProperties(result); // 重点}if (this.localProperties != null) {for (Properties localProp : this.localProperties) {CollectionUtils.mergePropertiesIntoMap(localProp, result);}}if (!this.localOverride) {// Load properties from file afterwards, to let those properties override.loadProperties(result); // 重点}return result;
}

Properties org.springframework.core.io.support.PropertiesLoaderSupport(Properties props) 中

protected void loadProperties(Properties props) throws IOException {if (this.locations != null) {for (Resource location : this.locations) {if (logger.isInfoEnabled()) {logger.info("Loading properties file from " + location);}try {PropertiesLoaderUtils.fillProperties(props, new EncodedResource(location, this.fileEncoding), this.propertiesPersister); // 重点}catch (IOException ex) {if (this.ignoreResourceNotFound) {if (logger.isWarnEnabled()) {logger.warn("Could not load properties from " + location + ": " + ex.getMessage());}}else {throw ex;}}}}
}

发现了fileEncoding，那么就可以根据具体情况设置了。