<bean id="loadKeyFromProperties" class="com.；landau.init.LoadKeyFormProperties">
        <property name="keyFileResource">
            <value>classpath:keys.properties</value>
        </property>
    </bean>

public class LoadKeyFormProperties implements InitializingBean {

    private Resource keyFileResource;

    private static Map<String, String> map = new HashMap<String, String>();

    protected static volatile boolean initialized = false;

    public static Map<String, String> getKey() {
        return map;
    }

    public void setKeyFileResource(Resource keyFileResource) {
        this.keyFileResource = keyFileResource;
    }

    /**
     * 将键值对取到集合内
     */
    private void loadKeyFormProperties() {
        if (initialized) {
            return;
        }
        InputStream is = null;
        try {
            is = keyFileResource.getInputStream();
            BufferedReader br = new BufferedReader(new InputStreamReader(is));
            String str = null;
            while ((str = br.readLine()) != null) {
                String[] data = str.split("=");
                map.put(data[0], data[1]);
            }
            initialized = true;
        } catch (Exception e) {

        } finally {
           is.close();
        }

    }

    @Override
    public void afterPropertiesSet() throws Exception {
        loadKeyFormProperties();
    }

}