检查注册表中是否已存在用户名 [英] Check if username already exists in the register form
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问题描述
我有以下注册表格：
<h:form id="newCustomerForm" >
<fieldset>
<legend>Register Form</legend>
<table border="0" >
<tbody >
<tr type="text">
<td>
<p:outputLabel value="Account Login :" for="pseudo"/>
</td>
<p:spacer height="5px" />
<td>
<p:inputText id="pseudo" value="#{customerMB.login}" title="Pseudo" required="true" requiredMessage="The Pseudo field is required."/>
<p:watermark for="pseudo" value="Login" />
<p:message for="pseudo"/>
</td>
</tr>
<p:spacer height="5px" />
<tr type="password">
<td>
<p:outputLabel value="Password :" for="pwd1"/>
</td>
<p:spacer height="5px" />
<td>
<p:password id="pwd1" value="#{customerMB.password}" feedback="true" match="pwd2" label="Password 1" required="true" requiredMessage="The Password field is required."/>
<p:watermark for="pwd1" value="Password" />
<p:message for="pwd1"/>
</td>
</tr>
<p:spacer height="5px" />
<tr type="password">
<td>
<p:outputLabel value="Confirm password :" for="pwd2"/>
</td>
<p:spacer height="5px" />
<td>
<p:password id="pwd2" value="#{customerMB.password}" feedback="true" label="Password 2" required="true" requiredMessage="The confirm password field is required."/>
<p:watermark for="pwd2" value="Confirm Password" />
<p:message for="pwd2"/>
</td>
</tr>
<p:spacer height="5px" />
<tr type="text">
<td>
<p:outputLabel value="Email address :" for="email"/>
</td>
<p:spacer height="5px" />
<td>
<p:inputText id="email" value="#{customerMB.email}" title="Email" required="true" validatorMessage="Insert a valid email" requiredMessage="The Email field is required.">
<f:validateRegex pattern="([^.@]+)(\.[^.@]+)*@([^.@]+\.)+([^.@]+)" />
</p:inputText>
<p:watermark for="email" value="Email" />
<p:message for="email"/>
</td>
</tr>
<p:spacer height="5px" />
<tr type="text">
<td>
<p:outputLabel value="First Name :" for="name"/>
</td>
<p:spacer height="5px" />
<td>
<p:inputText id="name" value="#{customerMB.name}" title="Name" required="true" requiredMessage="The Name field is required." styleClass="error"/>
<p:watermark for="name" value="First Name" />
<p:message for="name"/>
</td>
</tr>
<p:spacer height="5px" />
<tr type="text">
<td>
<p:outputLabel value="Last Name :" for="familyName"/>
</td>
<p:spacer height="5px" />
<td>
<p:inputText id="familyName" value="#{customerMB.familyName}" title="FamilyName" required="true" requiredMessage="The FamilyName field is required."/>
<p:watermark for="familyName" value="Last Name" />
<p:message for="familyName"/>
</td>
</tr>
<p:spacer height="5px" />
<tr type="text">
<td>
<p:outputLabel value="Organization :" for="organisation"/>
</td>
<p:spacer height="5px" />
<td>
<p:inputText id="organisation" value="#{customerMB.organisation}" title="Organisation" required="true" requiredMessage="The Organisation field is required."/>
<p:watermark for="organisation" value="Organisation" />
<p:message for="organisation"/>
</td>
</tr>
<p:spacer height="5px" />
<tr type="text">
<td>
<p:outputLabel value="Country :" for="country"/>
</td>
<p:spacer height="5px" />
<td>
<p:selectOneMenu id="country" style="width: 292px" value="#{customerMB.address.country}" required="true" requiredMessage="The Status field is required." >
<f:selectItem itemLabel="Select Country" itemValue="" />
<f:selectItems value="#{customerMB.allCountries}" />
</p:selectOneMenu>
<p:watermark for="country" value="Country" />
<p:message for="country"/>
</td>
</tr>
<p:spacer height="5px" />
<p:spacer height="5px" />
</tbody>
</table>
<div type="submit" align="right" style="margin-top: 5px">
<p:commandButton style="margin-right: 20px" value="Save" ajax="false" icon="ui-icon-circle-check" styleClass="ui-priority-primary" action="#{customerMB.addCustomer()}" />
<p:commandButton value="Cancel" icon="ui-icon-arrowrefresh-1-n" onclick="location.href = 'login.jsp';" process="@this" >
<p:resetInput target="customerPannel" />
</p:commandButton>
</div>
</fieldset>
</h:form>
在我的ViewScoped Bean中保留用户帐户的方法是：
The method that persists a user account in my ViewScoped Bean is:
public String addCustomer() throws IOException {
logger.log(Level.SEVERE, "*****add customer***** ");
creation = new Date();
right = Right.SimpleUser;
Customer customerRegister = customerLocal.addUser(name, familyName, address, email, right, creation, organisation);
accountBusinessLocal.addAccount(login, password, customerRegister);
return "login.jsp";
}
这是我的帐户ManagedBean
And this is my account ManagedBean
public class AccountBusiness implements AccountBusinessLocal {
@Inject
private AccountManagerLocal accountManagerLocal;
@Override
public Account addAccount(String login, String password, Customer customer) {
Account account;
account = accountManagerLocal.createAccount(login, password);
account.setCustomer(customer);
accountManagerLocal.persistAccount(account);
return account;
}
@Override
public boolean authentificateUser(String username, String password) {
Account account = accountManagerLocal.findByLogin(username);
if (account != null) {
if (password.equalsIgnoreCase(account.getPassword())) {
return true;
}
}
return false;
}
}
我想在帐户登录输入中添加一个控件检查用户名是否已被其他用户使用的文本。如果是，则用户应该收到消息并重新输入可用的用户名。
我该怎么办？
I want to add a control in the account login input text that checks if the username is already used by another user or not. If yes the user should get a message and re-enter an available username. How can i do this??
推荐答案
对addCustomer（）方法进行如下更改。我已添加评论以便您了解。
Make changes to addCustomer() method as below . I've added comments for you to get an idea.
public String addCustomer() throws IOException {
//you don't need password to check though
boolean isExist = accountBusinessLocal.authentificateUser(login,password);
if(isExist){
//return empty
FacesContext context = FacesContext.getCurrentInstance(
context.addMessage(null, new FacesMessage(FacesMessage.SEVERITY_ERROR, "Duplicated Login", null));
return "";
}
logger.log(Level.SEVERE, "*****add customer***** ");
creation = new Date();
right = Right.SimpleUser;
Customer customerRegister = customerLocal.addUser(name, familyName, address, email, right, creation, organisation);
accountBusinessLocal.addAccount(login, password, customerRegister);
return "login.jsp";
}
更新：
为了显示消息，请在表单中添加p：message标记。
Update: In order to show message ,add p:message tag inside the form.
<p:messages id="messages" showDetail="true" autoUpdate="true" closable="true" />
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