第一种:context:property-placeholder
<context:property-placeholder location="classpath:jdbc.properties"/>
第二种:PropertyPlaceholderConfigurer, 与第一种等价
<bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> <property name="ignoreUnresolvablePlaceholders" value="true"/> <property name="locations"> <list> <value>classpath:jdbc.properties</value> </list> </property> </bean>
第三种: PropertiesFactoryBean
<bean id="prop" class="org.springframework.beans.factory.config.PropertiesFactoryBean"> <property name="locations"> <array> <value>classpath:jdbc.properties</value> </array> </property> </bean>
第四种: util:properties
<util:properties id="propertiesReader" location="classpath:jdbc.properties"/>
第五种: 实现PropertyPlaceholderConfigurer在加载上下文的时候暴露properties到自定义子类的属性中以供程序中使用
<bean id="propertyConfigurer" class="com.*.util.PropertyConfigurer"> <property name="ignoreUnresolvablePlaceholders" value="true"/> <property name="ignoreResourceNotFound" value="true"/> <property name="locations"> <list> <value>classpath:jdbc.properties</value> </list> </property> </bean>
package com.*.util; import org.springframework.beans.BeansException; import org.springframework.beans.factory.config.ConfigurableListableBeanFactory; import org.springframework.beans.factory.config.PropertyPlaceholderConfigurer; import java.util.Properties; /** * @author dhm * @desc * @date 2017/11/21 */ public class PropertyConfigurer extends PropertyPlaceholderConfigurer { private Properties props; @Override protected void processProperties(ConfigurableListableBeanFactory beanFactoryToProcess, Properties props) throws BeansException { super.processProperties(beanFactoryToProcess, props); this.props = props; } public String getProperty(String key) { return props.getProperty(key); } }
第六种: 原始java读取
package com.*.util; import lombok.extern.slf4j.Slf4j; import java.io.FileNotFoundException; import java.io.IOException; import java.io.InputStream; import java.util.Properties; /** * @author dhm * @desc properties文件读取工具类 * @date 2017/11/21 */ @Slf4j public class PropertyUtil { private static Properties props; static { loadProps(); } synchronized static private void loadProps() { log.info("开始加载encrypt.properties文件内容......."); props = new Properties(); InputStream in = null; try { // in = PropertyUtil.class.getClassLoader().getResourceAsStream("encrypt.properties"); in = PropertyUtil.class.getResourceAsStream("/encrypt.properties"); props.load(in); } catch (FileNotFoundException e) { log.error("encrypt.properties文件未找到"); } catch (IOException e) { log.error("出现IOException"); } finally { try { if (null != in) { in.close(); } } catch (IOException e) { log.error("encrypt.properties文件流关闭出现异常"); } } log.info("加载encrypt.properties文件内容完成..........."); } public static String getProperty(String key) { if (null == props) { loadProps(); } return props.getProperty(key); } public static void main(String[] args) { System.out.println(getProperty("name")); } }