read-jpetstore-3-用户管理

●    JPetStore用户管理分析
JPetStore将登陆后的用户ActionForm保持于Session作用域中，在页面中判断该ActionForm中的用户信息，实现了简单的用户验证。

Ø 进入用户管理
<a href="<c:url value="/shop/signonForm.do"/>">
Ø Struts-config.xml配置

<action path="/shop/signonForm"
    type="org.springframework.samples.jpetstore.web.struts.DoNothingAction"                validate="false">

           <forward name="success" path="/WEB-INF/jsp/struts/SignonFrm.jsp"/>
    </action>

Ø 进入用户登陆的SignonForm.jsp
… …
<form action="<c:url value="/shop/signon.do"/>" method="POST">
<c:if test="${!empty signonForwardAction}">

<input type="hidden" name="forwardAction"

value="<c:url value="${signonForwardAction}"/>"/>
</c:if>
<td colspan="2">Please enter your username and password.

<td><input type="text" name="username" value="j2ee" /></td>

<td><input type="password" name="password" value="j2ee" /></td>

<td><input type="image" border="0" src="../images/button_submit.gif" name="update"

<a href="<c:url value="/shop/newAccountForm.do"/>">

<img border="0" src="../images/button_register_now.gif" />

</a>

</form>

… …

Ø SignonAction类

i)              <action path="/shop/signon"
       type="org.springframework.samples.jpetstore.web.struts.SignonAction"       name="accountForm" scope="session" validate="false">
           <forward name="success" path="/shop/index.do"/>
        </action>

ii)           <form-bean name="accountForm"
type="org.springframework.samples.jpetstore.web.struts.AccountActionForm"/>

iii)        SignonAction

public class SignonAction extends BaseAction {

  public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception {

    request.getSession().removeAttribute("workingAccountForm");

    request.getSession().removeAttribute("accountForm");
    //如果用户注销，则清空Session

    if (request.getParameter("signoff") != null) {

      request.getSession().invalidate();

      return mapping.findForward("success");

    }

        else {

      AccountActionForm acctForm = (AccountActionForm) form;

      String username = acctForm.getUsername();

      String password = acctForm.getPassword();

      //用户验证

      Account account = getPetStore().getAccount(username, password);

      if (account == null) {

        request.setAttribute("message", "Invalid username or password.  Signon failed.");

        return mapping.findForward("failure");

      }

            else {

                String forwardAction = acctForm.getForwardAction();

                acctForm = new AccountActionForm();

                acctForm.setForwardAction(forwardAction);

        acctForm.setAccount(account);

        acctForm.getAccount().setPassword(null);

        PagedListHolder myList = new PagedListHolder(getPetStore().getProductListByCategory(account.getFavouriteCategoryId()));

                myList.setPageSize(4);

                acctForm.setMyList(myList);

    //用户通过验证后，将ActiongFrom存入Session

                request.getSession().setAttribute("accountForm", acctForm);

        if (acctForm.getForwardAction() == null || acctForm.getForwardAction().length() < 1) {

          return mapping.findForward("success");

        }

                else {

          response.sendRedirect(acctForm.getForwardAction());

          return null;
        }
      }
    }
  }
}

iv)          

<!—查找Session中是否存在accountForm.account对象，以此判断用户是否登陆-->

    <c:if test="${!empty accountForm.account}">

    <b><i><font size="2" color="BLACK">Welcome

    <!—如果已经登陆，显示欢迎信息-->

<c:out value="${accountForm.account.firstName}"/>!</font></i></b>

    </c:if>

    <!—查找Session中是否存在accountForm.account对象，以此判断用户是否登陆-->

<c:if test="${!empty accountForm.account}" >

    <!—如果已经登陆，显示修改用户信息URL-->

      <a href="<c:url value="/shop/signon.do?signoff=true"/>">

<img border="0" name="img_signout" src="../images/sign-out.gif" /></a>

         <img border="0" src="../images/separator.gif" />

      <a href="<c:url value="/shop/editAccountForm.do"/>">

<img border="0" name="img_myaccount" src="../images/my_account.gif" /></a>

</c:if>

v)             
        <action path="/shop/editAccountForm" type="org.springframework.samples.jpetstore.web.struts.EditAccountFormAction"
               name="workingAccountForm" scope="session"  validate="false">

<forward name="success" path="/WEB-INF/jsp/struts/EditAccountForm.jsp"/>
   </action>

<form-bean name="workingAccountForm" type="org.springframework.samples.jpetstore.web.struts.AccountActionForm"/>

大概看了看，总的来说,JPetStore的应用逻辑还是比较简单，JpetStore的学习和分析也就到此结束。