Spring读取properties资源文件
我们知道可以通过读取资源文件流后加载到Properties对象,再使用该对象方法来获取资源文件。现在介绍下利用Spring内置对象来读取资源文件。
系统启动时加载资源文件链路:web.xml --> spring-core.xml --> sysconfig.properties
接下来直接看代码吧
web.xml
<context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:spring-core.xml</param-value> </context-param>
spring-core.xml
<!-- 加载properties里的内容 --> <bean id="PropertyConfig" class="com.wulinfeng.PropertiesConfig"> <property name="ignoreUnresolvablePlaceholders" value="true" /> <property name="locations"> <list> <value>classpath:sysconfig.properties</value> </list> </property> <property name="fileEncoding"> <value>UTF-8</value> </property> </bean>
PropertiesConfig.java
public class PropertiesConfig extends PropertyPlaceholderConfigurer { private static Map<String, String> propertyMap; @Override protected void processProperties(ConfigurableListableBeanFactory beanFactoryToProcess, Properties props) throws BeansException { super.processProperties(beanFactoryToProcess, props); if (propertyMap == null || propertyMap.size() == 0) { propertyMap = new HashMap<String, String>(); for (Object key : props.keySet()) { String keyStr = key.toString(); String value = props.getProperty(keyStr); propertyMap.put(keyStr, value); } } } public static String getProperty(String name,String def) { if (propertyMap == null || propertyMap.isEmpty() || null == propertyMap.get(name)) { return def; } return propertyMap.get(name); } public static String getProperty(String name) { if (propertyMap == null || propertyMap.isEmpty()) { return null; } return propertyMap.get(name); } }
注意这里需要继承Spring的PropertyPlaceholderConfigurer类。