通过properties文件保存一些基本不会发生变化的键值对是一种非常好的设计思路，提高代码简洁性。

public class PropertiesLoader {
    private static Logger logger = LoggerFactory.getLogger(PropertiesLoader.class);
    private static ResourceLoader resourceLoader = new DefaultResourceLoader();
    private Properties properties;

    public PropertiesLoader(String... resourcesPaths) {
        properties = loadProperties(Arrays.asList(resourcesPaths));
    }

    /**
     * 载入多个文件, 文件路径使用Spring Resource格式.
     */
    private Properties loadProperties(List<String> resourcesPaths) {
        Properties props = new Properties();

        for (String location : resourcesPaths) {

            InputStream is = null;
            try {
                Resource resource = resourceLoader.getResource(location);
                is = resource.getInputStream();
                props.load(is);
            }catch (FileNotFoundException e){
                // not trans--
            } catch (Exception e) {
                logger.info("Could not load properties from path:" + location + ", " + e.getMessage());
            } finally {
                IOUtils.closeQuietly(is);
            }
        }
        return props;
    }

    /**
     * 取出String类型的Property，但以System的Property优先,如果都为Null则抛出异常.
     */
    public String getProperty(String key) {
        String value = getValue(key);
        if (value == null) {
            throw new NoSuchElementException();
        }
        return value;
    }

    /**
     * 取出Property，但以System的Property优先,取不到返回空字符串.
     */
    private String getValue(String key) {
        String systemProperty = System.getProperty(key);
        if (systemProperty != null) {
            return systemProperty;
        }
        if (properties.containsKey(key)) {
            return properties.getProperty(key);
        }
        return "";
    }

}

public class ConfigUtil {

    static PropertiesLoader GLOB_CONFIG = null;

    static {
        init();
    }

    private static void init() {
        //输入配置文件名，一个或多个
        GLOB_CONFIG = new PropertiesLoader("companyName.properties");
    }

    public static String getConfig(String key) {
        if (GLOB_CONFIG == null) {
            init();
        }
        String value = GLOB_CONFIG.getProperty(key);
        if (StringUtils.isEmpty(value)) {
            value = "";
        }
        return value;
    }
}

通过上面的代码实现后，我们可以通过
ConfigUtil.getConfig("propertiesName")来获取到配置好的键对应的值。