Spring用代码来读取properties文件实例解析

<bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
    <property name="location">
      <value>classpath:config.properties</value>
    </property>
  </bean>

  @Value("${sql.name}")
  private String sqlName;

public class PropertyPlaceholder extends PropertyPlaceholderConfigurer {

  private static Map<String,String> propertyMap;

  @Override
  protected void processProperties(ConfigurableListableBeanFactory beanFactoryToProcess, Properties props) throws BeansException {
    super.processProperties(beanFactoryToProcess, props);
    propertyMap = new HashMap<String, String>();
    for (Object key : props.keySet()) {
      String keyStr = key.toString();
      String value = props.getProperty(keyStr);
      propertyMap.put(keyStr, value);
    }
  }

  //static method for accessing context properties
  public static Object getProperty(String name) {
    return propertyMap.get(name);
  }
}

 <bean id="propertyConfigurer" class="com.gyoung.mybatis.util.PropertyPlaceholder">
    <property name="location">
      <value>classpath:config.properties</value>
    </property>
  </bean>

 PropertyPlaceholder.getProperty("sql.name");

<bean id="propertyConfigurer"
     class="com.gyoung.mybatis.util.PropertyPlaceholder">
    <property name="ignoreResourceNotFound" value="true"/>
    <property name="locations">
      <list>
        <value>file:./jdbc.properties</value>
        <value>file:./module.config.properties</value>
        <value>classpath:jdbc.properties</value>
        <value>classpath*:*.config.properties</value>
      </list>
    </property>
  </bean>