JavaWeb中web.xml初始化加载顺序详解

public class InitServlet extends HttpServlet {  private static final long serialVersionUID = 1L;  @Override  public void init(){    try {      if(Constants.PAY_URL.size()==0){        List<CommonEntity> listPayUrl = PropertiesListUtil.listPayUrl();        for(CommonEntity entity:listPayUrl){          Constants.PAY_URL.put(entity.getEntityCode(), entity.getEntityName());        }      }      LogUtil.info("佛祖保佑    永不宕机   永无BUG ：初始化系统数据数量:"+Constants.PAY_URL.size());      Configs.init("zfbinfo.properties");      LogUtil.info("初始化支付宝配置信息");      SDKConfig.getConfig().loadPropertiesFromSrc();      LogUtil.info("初始化银联支付配置信息");    } catch (Exception e) {      e.printStackTrace();    }  }    @Override  public void doGet(HttpServletRequest request, HttpServletResponse response)      throws ServletException, IOException {    Constants.PAY_URL = new ConcurrentHashMap<String, String>();    List<CommonEntity> listPayUrl = PropertiesListUtil.listPayUrl();    for(CommonEntity entity:listPayUrl){      Constants.PAY_URL.put(entity.getEntityCode(), entity.getEntityName());    }    LogUtil.info("初始化系统数据数量:"+Constants.PAY_URL.size());  }  @Override  public void doPost(HttpServletRequest request, HttpServletResponse response)      throws ServletException, IOException {    doGet(request, response);  }}