Class PropertyPlaceholderHelper的使用

1.代码

private static Properties properties = new Properties();

public static String getProperties(String key) {
        PropertyPlaceholderHelper propertyPlaceholderHelper = new PropertyPlaceholderHelper(PlaceholderConfigurerSupport.DEFAULT_PLACEHOLDER_PREFIX, PlaceholderConfigurerSupport.DEFAULT_PLACEHOLDER_SUFFIX);
        if(properties.containsKey(key)){
            return propertyPlaceholderHelper.replacePlaceholders(PlaceholderConfigurerSupport.DEFAULT_PLACEHOLDER_PREFIX + key + PlaceholderConfigurerSupport.DEFAULT_PLACEHOLDER_SUFFIX, properties);
        }else{
            return "";
        }
    }