JPetStore之我见

这两天看JPetStore（ibatis和struts），我原想把struts标签都改成el和jstl（需要加standard和jstl jar文件）。结果把html 改的过程出了很多问题，html:text /areatext /radio/checkbox/ select/ option必须包含在html:form中，它们的property要对应form 的action对应的bean,select/ option比较麻烦。所以总结出来，改造过程可以分两步走：1 html：from部分不变，其中还涉及验证，2bean和logic可以改为el和jstl，不过改了之后竟然识别不出来。。郁闷，只好先暂停。。
在程序中文件的后缀名改为shtml,每一个页面都经过servlet。
下面是beanaction的内容：
private static final String NO_METHOD_CALL = "*";
  private static final String SUCCESS_FORWARD = "success";
  public final ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception {
    String forward = SUCCESS_FORWARD;
    try {
      if (!(form instanceof BaseBean)) {
        if (form != null) {         ...........        } else {         ..............        }
      }
      BaseBean bean = (BaseBean) form;
      ActionContext.initCurrentContext(request, response);
      if (bean != null) {
        // Explicit Method Mapping
        Method method = null;
        String methodName = mapping.getParameter();
        if (methodName != null && !NO_METHOD_CALL.equals(methodName)) {
          try {
            method = bean.getClass().getMethod(methodName, null);
            synchronized (bean) {
              forward = bean.getInterceptor().intercept(new ActionInvoker(bean, method));
            }
          } catch (Exception e) {
           ..........
          }
        }
        // Path Based Method Mapping
        if (method == null && !NO_METHOD_CALL.equals(methodName)) {
          methodName = mapping.getPath();
          if (methodName.length() > 1) {
            int slash = methodName.lastIndexOf("/") + 1;
            methodName = methodName.substring(slash);
            if (methodName.length() > 0) {
              try {
                method = bean.getClass().getMethod(methodName, null);
                synchronized (bean) {
                  forward = bean.getInterceptor().intercept(new ActionInvoker(bean, method));
                }
              } catch (Exception e) {
                .......
              }
            }
          }
        }
      }
    } catch (Exception e) {
      forward = "error";
      request.setAttribute("BeanActionException", e);
    }
    return mapping.findForward(forward);
  }
BeanActionException（RuntimeException） 很值得学习4个构造函数 super()/super(string)/super(throwable)/super(string,throwable)
ActionContext (cookieMap    parameterMap  requestMap    sessionMap   applicationMap/request/response)
abstract class BaseHttpMap拥有四个抽象的方法getNames() /getValue()/putValue()/removeValue())
abstract class BaseHttpMap implements Map 要实现map的一些方法。
throw new UnsupportedOperationException("Cannot put value to ParameterMap.");