如果我的帐户密码错误，或者没有此帐户，如何使用 Ajax 验证我的帐户密码，登录页面下方会显示一条消息。
索引.html
<h:body>
<p:panel header="Login" id="logic" style="width: 410px">
<h:form id="form01">
<p:panelGrid id ="pan01" columns="2">
<f:facet name="header">
</f:facet>
<h:outputLabel value="name : " />
<p:inputText id="firstname" value="#{logic.name}" label="Firstname" required="true" requiredMessage="Must input your name" />
<h:outputLabel value="pass : " />
<p:password id="surname" value="#{logic.pass}" required="true" label="Surname" requiredMessage="Must input your pass"/>
<h:outputText value="Login"/>
<h:commandButton value="Login" action="#{logic.register()}" style="height: 30px ; width: 210px">
<f:ajax execute="@form" render="123"/>
</h:commandButton>
</p:panelGrid>
<p/>
<p:message for="firstname" id="NameMessage" display="text"/>
<p/>
<p:message for="surname" id="PassMessage" display="text"/>
</h:form>
</p:panel>
</h:body>
Java 代码
public String register() {
Query q = e.createNamedQuery("BnUser.findByUserUsername");
q.setParameter("userUsername", getName());
List resultList = q.getResultList();
BnUser result = (BnUser) resultList.get(0);
permission = result.getBnMembershipList().iterator().next().getDbid();
System.out.println("login=======" + permission);
dbname = result.getUserUsername();
dbpass = result.getUserPassword();
if (dbpass.equals(getPass()) && (getPermission() == 6)) {
return "/Administrator//index";
} else if (dbpass.equals(getPass()) && (getPermission() == 5)) {
return "/index";
} else {
return null;
}
}