public static String getProperty(String key) {
        if (key == null) {
            return null;
        }
        return getProperties().getProperty(key);
    }
public static String getProperty(String key) {
        if (key == null) {
            return null;
        }
        return getProperties().getProperty(key);
    }
public static String getProperty ( String key ) { if ( key == null ) { return null ; } return getProperties ( ) . getProperty ( key ) ; }
根据key获取配置的字符串value值
@param key
@return
根据key获取配置的字符串value值