Spring读取properties资源文件

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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);

    }

}