propertyutils 文件解读 -买球官网平台

单例模式 ，静态代码块
/**
 * property utils
 * single instance
 */
public class propertyutils {
    /**
     * logger
     */
private static final logger logger = loggerfactory.getlogger(propertyutils.class);
    private static final properties properties = new properties();
    private propertyutils() {
        throw new unsupportedoperationexception("construct propertyutils");
    }
    static {
        string[] propertyfiles = new string[]{"/common.properties"};
        for (string filename : propertyfiles) {
            inputstream fis = null;
            try {
                fis = propertyutils.class.getresourceasstream(filename);
                properties.load(fis);
            } catch (ioexception e) {
                logger.error(e.getmessage(), e);
                if (fis != null) {
                    ioutils.closequietly(fis);
                }
                system.exit(1);
            } finally {
                ioutils.closequietly(fis);
            }
        }
    }
    /**
     *
     * @return  judge whether resource upload startup
     */
public static boolean getresuploadstartupstate(){
        // hdfs 或者s3 资源是否启用
string resuploadstartuptype = propertyutils.getuppercasestring("resource.storage.type");
        resuploadtype resuploadtype = resuploadtype.valueof(resuploadstartuptype);
        return resuploadtype == resuploadtype.hdfs || resuploadtype == resuploadtype.s3;
    }
   // 获取指定key或者获取不到赋予默认值省略
}
相关存储枚举如下：

/**
 * data base types
 */
public enum resuploadtype {
  /**
   * 0 hdfs
   * 1 s3
   * 2 none
   */
hdfs,s3,none
}

代码来源于dolphinscheduler 的1.36版本