如何在我的登录页面上实现多字段验证（JSF 2.0）

Question

I need a multiple field validation for login page (many fields validated at once in the same method). I don't know how to implement it correctly. I am following an example I found at: http://balusc.blogspot.com/2007/12/validator-for-multiple-fields.html

I get a bit confused in the JSF part.Can somebody give me a hand, what am I missing?

The page:

<h:form>
    <p:panel>
        <h:outputText value="*Em@il:" />
        <h:inputText id="email" value="#{securityController.email}"
            required="true" />
        <br />
        <h:outputText value="*Password: " />
        <h:inputSecret id="password" value="#{securityController.password}"
            required="true">
            <f:validator validatorId="loginValidator" />
        </h:inputSecret>
        <br />
        <span style="color: red;"><h:message for="password"
                showDetail="true" /></span>
        <br />
        <h:commandButton value="Login" action="#{securityController.logIn()}" />
    </p:panel>
</h:form>

This is the managed bean with the validate method:

@ManagedBean
@RequestScoped
public class SecurityController implements Validator {

    @EJB
    private IAuthentificationEJB authentificationEJB;
    private String email;
    private String password;
    private String notificationValue;

    public String logIn() {
        if (authentificationEJB.saveUserState(email, password)) {
            notificationValue = "Dobro dosli";
            return "main.xhtml";
        } else {
            return "";
        }
    }

    public void validate(FacesContext context, UIComponent validate,
            Object value) {
        String emailInput = (String) value;
        String emailPatternText = "^[_A-Za-z0-9-]+(\\.[_A-Za-z0-9-]+)"
            + "*@[A-Za-z0-9]+(\\.[A-Za-z0-9]+)*(\\.[A-Za-z]{2,})$";
        Pattern emailPattern = null;
        Matcher emailMatcher = null;
        emailPattern = Pattern.compile(emailPatternText);
        emailMatcher = emailPattern.matcher(emailInput);
        String inputFromField = (String) value;
        String alphanumericPattern = "^[a-zA-Z0-9]+$";
        Pattern passwordPattern = null;
        Matcher passwordMatcher = null;
        passwordPattern = Pattern.compile(alphanumericPattern);
        passwordMatcher = passwordPattern.matcher(inputFromField);
        if (!emailMatcher.matches() && !passwordMatcher.matches()) {
            if (authentificationEJB.checkCredentials(email, password) == false) {
                FacesMessage msg = new FacesMessage(
                    "Pogresan email ili lozinka");
                throw new ValidatorException(msg);
            }
        }
    }

    public String getEmail() {
        return email;
    }

    public String getPassword() {
        return password;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getNotificationValue() {
        return notificationValue;
    }

    public void setNotificationValue(String notificationValue) {
        this.notificationValue = notificationValue;
    }
}

EJB that interacts with database to check credentials:

@Stateful(name = "ejbs/AuthentificationEJB")
public class AuthentificationEJB implements IAuthentificationEJB {

    @PersistenceContext
    private EntityManager em;

    // Login
    public boolean saveUserState(String email, String password) {
        // 1-Send query to database to see if that user exist
        Query query = em
            .createQuery("SELECT r FROM Role r WHERE r.email=:emailparam "
                + "AND r.password=:passwordparam");
        query.setParameter("emailparam", email);
        query.setParameter("passwordparam", password);
        // 2-If the query returns the user(Role) object, store it somewhere in
        // the session
        Role role = (Role) query.getSingleResult();
        if (role != null && role.getEmail().equals(email)
            && role.getPassword().equals(password)) {
            FacesContext.getCurrentInstance().getExternalContext()
                .getSessionMap().put("userRole", role);
            // 3-return true if the user state was saved
            System.out.println(role.getEmail() + role.getPassword());
            return true;
        }
        // 4-return false otherwise
        System.out.println(role.getEmail() + role.getPassword());
        return false;
    }

    // Logout
    public void releaseUserState() {
        // 1-Check if there is something saved in the session(or wherever the
        // state is saved)
        if (!FacesContext.getCurrentInstance().getExternalContext()
            .getSessionMap().isEmpty()) {
            FacesContext.getCurrentInstance().release();
        }
        // 2-If 1 then flush it
    }

    // Check if user is logged in
    public boolean checkAuthentificationStatus() {
        // 1-Check if there is something saved in the session(This means the
        // user is logged in)
        if ((FacesContext.getCurrentInstance().getExternalContext()
            .getSessionMap().get("userRole") != null)) {
            // 2-If there is not a user already loged, then return false
            return true;
        }
        return false;
    }

    @Override
    public boolean checkCredentials(String email, String password) {
        Query checkEmailExists = em
            .createQuery("SELECT COUNT(r.email) FROM Role r WHERE "
                + "r.email=:emailparam AND r.password=:passwordparam");
        checkEmailExists.setParameter("emailparam", email);
        checkEmailExists.setParameter("passwordparam", password);
        long matchCounter = 0;
        matchCounter = (Long) checkEmailExists.getSingleResult();
        if (matchCounter > 0) {
            return true;
        }
        return false;
    }
}

Removed LoginValidator

The modified managed bean:

@ManagedBean
@RequestScoped
public class SecurityController {

    @EJB
    private IAuthentificationEJB authentificationEJB;
    private String email;
    private String password;
    private String notificationValue;

    public String logIn() {
        if (authentificationEJB.saveUserState(email, password)) {
            notificationValue = "Dobro dosli";
            return "main.xhtml";
        } else {
            return "";
        }
    }

    public void validate(FacesContext context, UIComponent component,
            Object value) throws ValidatorException {
        UIInput emailComponent = (UIInput) component.getAttributes().get(
            "emailComponent");
        String email = "";
        String password = "";
        email = (String) emailComponent.getValue();
        password = (String) value;
        String emailInput = email;
        String emailPatternText = "^[_A-Za-z0-9-]+(\\.[_A-Za-z0-9-]+)"
            + "*@[A-Za-z0-9]+(\\.[A-Za-z0-9]+)*(\\.[A-Za-z]{2,})$";
        Pattern emailPattern = null;
        Matcher emailMatcher = null;
        emailPattern = Pattern.compile(emailPatternText);
        emailMatcher = emailPattern.matcher(emailInput);
        String passwordInput = password;
        String alphanumericPattern = "^[a-zA-Z0-9]+$";
        Pattern passwordPattern = null;
        Matcher passwordMatcher = null;
        passwordPattern = Pattern.compile(alphanumericPattern);
        passwordMatcher = passwordPattern.matcher(passwordInput);
        if (!emailMatcher.matches() && !passwordMatcher.matches()) {
            if (authentificationEJB.checkCredentials(emailInput, passwordInput) == false) {
                FacesMessage msg = new FacesMessage(
                    "Pogresan email ili lozinka");
                throw new ValidatorException(msg);
            }
        }
        if (emailInput == null || passwordInput == null) {
            FacesMessage msg = new FacesMessage("Zaboraviliste nesto");
            throw new ValidatorException(msg);
        }
        if (passwordInput.length() <= 0 || emailInput.length() <= 0) {
            FacesMessage msg = new FacesMessage("Zaboraviliste nesto");
            throw new ValidatorException(msg);
        }
    }
    // Get set methods
}

The login form:

<h:form>
    <p:panel>
        <h:outputText value="*Em@il:" />
        <h:inputText id="email" value="#{securityController.email}"
            binding="#{emailComponent}" />
        <br />
        <h:outputText value="*Password: " />
        <h:inputSecret id="password" value="#{securityController.password}"
            validator="#{securityController.validate}">
            <f:attribute name="emailComponent" value="#{emailComponent}" />
        </h:inputSecret>
        <br />
        <span style="color: red;"><h:message for="password"
                showDetail="true" /></span>
        <br />
        <h:commandButton value="Login" action="#{securityController.logIn()}" />
    </p:panel>
</h:form>

Modified The saveUserState() method at the EJB:

// Login
public boolean saveUserState(String email, String password) {
    // 1-Send query to database to see if that user exist
    Query query = em
        .createQuery("SELECT r FROM Role r WHERE r.email=:emailparam "
            + "AND r.password=:passwordparam");
    query.setParameter("emailparam", email);
    query.setParameter("passwordparam", password);
    // 2-If the query returns the user(Role) object, store it somewhere in
    // the session
    try {
        Role role = (Role) query.getSingleResult();
        if (role != null && role.getEmail().equals(email)
            && role.getPassword().equals(password)) {
            FacesContext.getCurrentInstance().getExternalContext()
                .getSessionMap().put("userRole", role);
            // 3-return true if the user state was saved
            System.out.println(role.getEmail() + role.getPassword());
            return true;
        }
    } catch (Exception e) {
        // This fix the bug that does not display the message when wrong
        // password!
        FacesMessage msg = new FacesMessage("Pogresan email ili lozinka");
        throw new ValidatorException(msg);
    }
    // 4-return false otherwise
    return false;
}

Answer 1

You need to bind the first component by binding and pass it as attribute of the component you're validating. You also need to use validator attribute of the input field instead of <f:validator> when you want to call a validator method inside a managed bean. Finally you should get rid of the implements Validator on the bean class.

<h:outputText value="*Em@il:" />
<h:inputText id="email" binding="#{emailComponent}" value="#{securityController.email}" required="true"/>                   
<br/>
<h:outputText value="*Password: " />
<h:inputSecret id="password" value="#{securityController.password}" validator="#{securityController.validateEmailAndPassword}" required="true">
    <f:attribute name="emailComponent" value="#{emailComponent}" />
</h:inputSecret> 

with

public void validateEmailAndPassword(FacesContext context, UIComponent component, Object value) throws ValidatorException {
    UIInput emailComponent = (UIInput) component.getAttributes().get("emailComponent");
    String email = (String) emailComponent.getValue();
    String password = (String) value;

    // ...
}