可以做到的。在下面的代码中，特别注意
postValidate复合组件中的事件和
postValidate后备组件中的方法。请注意，它如何解析
Methodexpression属性并调用传入的方法。
这是复合组件：
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:cc="http://java.sun.com/jsf/composite" xmlns:h="http://java.sun.com/jsf/html" xmlns:ui="http://java.sun.com/jsf/facelets" xmlns:f="http://java.sun.com/jsf/core" xmlns:p="http://primefaces.org/ui"> <!-- Login form. --> <cc:interface componentType="com.example.LoginForm"> <cc:attribute name="emailAddress" type="java.lang.String" required="true"/> <cc:attribute name="rememberMe" type="java.lang.Boolean" required="true"/> <cc:attribute name="checkCredentials"method-signature="void checkCredentials(java.lang.String,java.lang.String,java.lang.String)"shortDescription="Parameters are clientId, username and password. If credentials are invalid, attach a FacesMessage to the component specified by clientId."required="true"/> <cc:attribute name="actionListener" method-signature="void actionListener()" required="true"/> <cc:attribute name="registerOutcome" type="java.lang.String" required="true"/> <cc:attribute name="recoverPasswordOutcome" type="java.lang.String" required="true"/> <cc:attribute name="headerTitle" type="java.lang.String" default="Sign In"/> <cc:attribute name="emailAddressLabel" type="java.lang.String" default="Email address:"/> <cc:attribute name="passwordLabel" type="java.lang.String" default="Password:"/> <cc:attribute name="rememberMeLabel" type="java.lang.String" default="Stay signed in on this machine"/> <cc:attribute name="loginLabel" type="java.lang.String" default="Sign In"/> <cc:attribute name="recoverPasswordLabel" type="java.lang.String" default="Forgot password?"/> <cc:attribute name="emailAddressRequiredMessage" type="java.lang.String" default="Email address required"/> <cc:attribute name="passwordRequiredMessage" type="java.lang.String" default="Password required"/> <cc:attribute name="registerLabel" type="java.lang.String" default="Register"/> </cc:interface> <cc:implementation> <h:outputStylesheet library="components/example/login-form" name="style.css"/> <div id="#{cc.clientId}"> <h:form id="form"> <f:event type="postValidate" listener="#{cc.postValidate}"/> <div > <p:panel header="#{cc.attrs.headerTitle}" styleClass="loginPanel"> <div > <p:messages rendered="#{facesContext.maximumSeverity.ordinal ge 2}"/> </div> <h:panelGrid columns="3"> <h:outputText styleClass="login-form_label" value="#{cc.attrs.emailAddressLabel}"/> <h:panelGroup styleClass="login-form_cell"> <h:inputText id="emailAddress" value="#{cc.attrs.emailAddress}" required="true" requiredMessage="#{cc.attrs.emailAddressRequiredMessage}" styleClass="login-form_field" immediate="true"/> </h:panelGroup> <h:panelGroup/> <h:outputText styleClass="login-form_label" value="#{cc.attrs.passwordLabel}"/> <h:panelGroup styleClass="login-form_cell"> <h:inputSecret id="password" value="#{cc.attrs.password}" required="true" requiredMessage="#{cc.attrs.passwordRequiredMessage}" styleClass="login-form_field" immediate="true"/> </h:panelGroup> <h:link styleClass="login-form_link" value="#{cc.attrs.recoverPasswordLabel}" outcome="#{cc.attrs.recoverPasswordOutcome}"/> <h:panelGroup/> <p:selectBooleanCheckbox value="#{cc.attrs.rememberMe}" itemLabel="#{cc.attrs.rememberMeLabel}" immediate="true"/> <h:panelGroup/> <h:panelGroup/> <h:panelGroup> <p:commandButton id="submitForm" value="#{cc.attrs.loginLabel}" actionListener="#{cc.attrs.actionListener}" update="form"/> <span >or</span> <h:link styleClass="login-form_link" value="#{cc.attrs.registerLabel}" outcome="#{cc.attrs.registerOutcome}"/> </h:panelGroup> <h:panelGroup/> </h:panelGrid> </p:panel> </div> </h:form> </div> </cc:implementation></html>支持组件：
@FacesComponent("com.example.LoginForm")public class LoginFormComponent extends UIInput implements NamingContainer{ @Override protected Object getConvertedValue(FacesContext context, Object newSubmittedValue) throws ConverterException { UIInput emailAddressComponent = (UIInput) findComponent(EMAIL_ADDRESS_ID); UIInput passwordComponent = (UIInput) findComponent(PASSWORD_ID); String emailAddress = (String) emailAddressComponent.getValue(); String password = (String) passwordComponent.getValue(); return new LoginFormValue(emailAddress, password); } public void postValidate(ComponentSystemEvent e) { FacesContext ctx = getFacesContext(); // Don't validate credentials if the username and/or password fields are invalid. if (!ctx.getMessageList(EMAIL_ADDRESS_ID).isEmpty() || !ctx.getMessageList(PASSWORD_ID).isEmpty()) { return; } LoginFormValue value = (LoginFormValue) getConvertedValue(null, null); Methodexpression checkCredentials = (Methodexpression) getAttributes().get(CHECK_CREDENTIALS_ATTRIBUTE_NAME); checkCredentials.invoke(ctx.getELContext(), new Object[]{getClientId(), value.getEmailAddress(), value.getPassword()}); } @Override public String getFamily() { return "javax.faces.NamingContainer"; } public static final String CHECK_CREDENTIALS_ATTRIBUTE_NAME = "checkCredentials"; public static final String EMAIL_ADDRESS_ID = "form:emailAddress"; public static final String PASSWORD_ID = "form:password";}该
LoginFormValue物品是否完整类：
public class LoginFormValue{ public LoginFormValue(String emailAddress, String password) { this.emailAddress = emailAddress; this.password = password; } public String getEmailAddress() { return emailAddress; } public String getPassword() { return password; } private String emailAddress; private String password;}使用登录表单的页面：
<!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml" xmlns:h="http://java.sun.com/jsf/html" xmlns:p="http://primefaces.org/ui" xmlns:ui="http://java.sun.com/jsf/facelets" xmlns:f="http://java.sun.com/jsf/core" xmlns:ex="http://java.sun.com/jsf/composite/components/example"> <h:head> <title></title> </h:head> <h:body> <ui:composition template="/WEB-INF/templates/myLayout.xhtml"> <ui:define name="windowTitle">Sign In</ui:define> <ui:define name="body"> <ex:login-form emailAddress="#{loginBean.emailAddress}" rememberMe="#{loginBean.rememberMe}" checkCredentials="#{loginBean.checkCredentials}" actionListener="#{loginBean.submit()}" recoverPasswordOutcome="recover-password" registerOutcome="signup"/> </ui:define> </ui:composition> </h:body></html>最后，页面的支持者：
@Named@RequestScopedpublic class LoginBean implements Serializable{ public String getEmailAddress() { return emailAddress; } public void setEmailAddress(String emailAddress) { this.emailAddress = emailAddress; } public boolean isRememberMe() { return rememberMe; } public void setRememberMe(boolean rememberMe) { this.rememberMe = rememberMe; } public void submit() { User user = userDao.findByEmailAddress(emailAddress); userRequestBean.login(user.getUserId()); // Remember me if (!rememberMe) { return; } // Handle rememberMe here (create a cookie, etc.) } public void checkCredentials(String clientId, String emailAddress, String password) { if (!securityEjb.checkCredentials(emailAddress, password)) { FacesMessage message = new FacesMessage(FacesMessage.SEVERITY_ERROR, "Incorrect email address/password", null); FacesContext ctx = FacesContext.getCurrentInstance(); ctx.addMessage(clientId, message); ctx.renderResponse(); } } private String emailAddress = ""; private boolean rememberMe = true; @Inject private UserRequestBean userRequestBean; @EJB private SecurityEjb securityEjb; @EJB private UserDao userDao; @EJB private LogincookieDao logincookieDao;}欢迎分享，转载请注明来源：内存溢出
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