Petstore源码追踪记(3)－商业逻辑处理(三)

<waf:form  name="existingcustomer" action="j_signon_check" method="POST">
    <table cellpadding="5" cellspacing="0" border="0">
     <tr>
      <td class="petstore" align="center" colspan="2">
       <b>Yes.</b>
      </td>
     </tr>
     <tr>
      <td class="petstore_form" align="right">
       <b>User Name:</b>
      </td>
      <td class="petstore_form">
      <c:choose>
      <c:when  test="${cookie［'bp_signon'］ != null && cookie［'bp_signon'］
!=''}">
       <waf:input CSSClass="petstore_form"
                             type="text"
                              size="15"
                           name="j_username"
                    validation="validation">
       <waf:value><c:out value="${cookie['bp_signon'].value}"/></waf:value>
      </waf:input>
     </td>
    </tr>
    <tr>

if ((targetURL != null) && targetURL.equals(FORM_SIGNON_URL)) {
　　System.out.PRintln("FORM SIGNON CHECK");
    validateSignOn(request, response, chain);
    // jump out of this method
    return;
}

public  void validateSignOn(ServletRequest request, ServletResponse  response,
FilterChain chain) throws IOException, ServletException {
        //从Request取出使用者输入的字段值
        // convert to a http servlet request for now
        HttpServletRequest hreq = (HttpServletRequest)request;
        HttpServletResponse hres = (HttpServletResponse)response;
        // get the user name
        String userName = hreq.getParameter(FORM_USER_NAME);
        // get the password
        String password = hreq.getParameter(FORM_PASSWORD);
        // check if the user wants userName set in cookie
        String rememberUserName =
　　　　 hreq.getParameter(REMEMBER_USERNAME);
        //若使用者有勾选Remember My User Name(记住我的帐号)功能，则产生Cookie记录使用者帐号
        if (rememberUserName != null) {
          // set a cookie with the username in it
          Cookie userNameCookie = new Cookie(COOKIE_NAME, userName);
          // set cookie to last for one month
          userNameCookie.setMaxAge(2678400);
          hres.addCookie(userNameCookie);
        } else {
            // see if the cookie exists and remove accordingly
            Cookie[] cookies = hreq.getCookies();
            if (cookies != null) {
                for (int loop=0; loop < cookies.length; loop++) {
                    if (cookies［loop］.getName().equals(COOKIE_NAME)) {
                        cookies［loop］.setMaxAge(0);
                        hres.addCookie(cookies［loop］);

                    }
                }
            }
        }
        //透过EJB从数据库读取资料进行比对
        //validate against the registered users
        SignOnLocal signOn = getSignOnEjb();
　　　　//请加入侦察程序代码，方便稍候程序验证
　　　　System.out.println("进行EJB tier使用者验证");
        //帐号及密码验证
        boolean authenticated = signOn.authenticate(userName, password);
        if (authenticated) {
            //验证成功则将使用者帐号(USER_NAME)及是否已登入(SIGNED_ON_USER)参数
存入Session
            // place a true boolean in the session
            if (hreq.getSession().getAttribute(USER_NAME) !
            = null) {
                hreq.getSession().removeAttribute(USER_NAME);
            }
            hreq.getSession().setAttribute(USER_NAME, userName);
            // remove the sign on user key before putting it back in
            if (hreq.getSession().getAttribute(SIGNED_ON_USER) != null) {
                hreq.getSession().removeAttribute(SIGNED_ON_USER);
            }
            hreq.getSession().setAttribute(SIGNED_ON_USER, new Boolean(true));
//将网页转导就会到达我们的目的地-使用者基本资料浏览画面(customer.do)
            // redirect to the original destination
            String targetURL =
(String)hreq.getSession().getAttribute(ORIGINAL_URL);
            hres.sendRedirect(targetURL);
            return;
        } else {
　　　　　　//若验证有误则将网页转导到登入失败画面(signon_error.screen)
            hres.sendRedirect(signOnErrorPage);
            return;
        }
     }

     //取得SignOn Local Stateless Session Bean Reference
     private SignOnLocal getSignOnEjb() throws ServletException {
         SignOnLocal signOn = null;
         try {
            InitialContext ic = new InitialContext();
            Object o = ic.lookup("java:comp/env/ejb/local/SignOn");
            SignOnLocalHome home =(SignOnLocalHome)o;
            signOn = home.create();
         } catch (javax.ejb.CreateException cx) {
             throw new ServletException("Failed to Create SignOn EJB: caught "
+ cx);
            
         } catch (javax.naming.NamingException nx) {
             throw new ServletException("Failed to Create SignOn EJB: caught "
+ nx);
        }
        return signOn;
     }

Object o = ic.lookup("java:comp/env/ejb/local/SignOn");

（出处：http://www.VeVb.com）