0

我正在使用 primefaces 和 jpa 开发 jsf，并且我的屏幕没有重定向到主页仍然存在于登录页面中而没有显示。

我的 web.xml 文件

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
  <display-name>Cation</display-name>
  <welcome-file-list>
    <welcome-file>login.xhtml</welcome-file>
  </welcome-file-list>
  <servlet>
    <servlet-name>Faces Servlet</servlet-name>
    <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>Faces Servlet</servlet-name>
    <url-pattern>/faces/*</url-pattern>
    <url-pattern>*.xhtml</url-pattern>
  </servlet-mapping>
  <context-param>
    <param-name>javax.servlet.jsp.jstl.fmt.localizationContext</param-name>
    <param-value>resources.application</param-value>
  </context-param>
  <context-param>
    <description>State saving method: 'client' or 'server' (=default). See JSF Specification 2.5.2</description>
    <param-name>javax.faces.STATE_SAVING_METHOD</param-name>
    <param-value>client</param-value>
  </context-param>
  <context-param>
    <description>
    This parameter tells MyFaces if javascript code should be allowed in
    the rendered HTML output.
    If javascript is allowed, command_link anchors will have javascript code
    that submits the corresponding form.
    If javascript is not allowed, the state saving info and nested parameters
    will be added as url parameters.
    Default is 'true'</description>
    <param-name>org.apache.myfaces.ALLOW_JAVASCRIPT</param-name>
    <param-value>true</param-value>
  </context-param>
  <context-param>
    <description>
    If true, rendered HTML code will be formatted, so that it is 'human-readable'
    i.e. additional line separators and whitespace will be written, that do not
    influence the HTML code.
    Default is 'true'</description>
    <param-name>org.apache.myfaces.PRETTY_HTML</param-name>
    <param-value>true</param-value>
  </context-param>
  <context-param>
    <param-name>org.apache.myfaces.DETECT_JAVASCRIPT</param-name>
    <param-value>false</param-value>
  </context-param>
  <context-param>
    <description>
    If true, a javascript function will be rendered that is able to restore the
    former vertical scroll on every request. Convenient feature if you have pages
    with long lists and you do not want the browser page to always jump to the top
    if you trigger a link or button action that stays on the same page.
    Default is 'false'
</description>
    <param-name>org.apache.myfaces.AUTO_SCROLL</param-name>
    <param-value>true</param-value>
  </context-param>
  <listener>
    <listener-class>org.apache.myfaces.webapp.StartupServletContextListener</listener-class>
  </listener>
</web-app>

我的 faces-config.xml 文件

<?xml version='1.0' encoding='UTF-8'?>
<faces-config xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-facesconfig_1_2.xsd"
    version="1.2">
    <managed-bean>
        <managed-bean-name>home</managed-bean-name>
        <managed-bean-class>com.cation.action.LoginAction</managed-bean-class>
        <managed-bean-scope>request</managed-bean-scope>      
    </managed-bean>
    <navigation-rule>
        <navigation-case>
            <from-outcome>home_page</from-outcome>
            <to-view-id>/pages/homePage.xhtml</to-view-id>
        </navigation-case>
    </navigation-rule>
</faces-config>

我的 login.xhtml

<html xmlns="http://www.w3c.org/1999/xhtml"
    xmlns:f="http://java.sun.com/jsf/core"
    xmlns:h="http://java.sun.com/jsf/html"
    xmlns:p="http://primefaces.prime.com.tr/ui">
<h:head>
    <link type="text/css" rel="stylesheet" href="themes/bluesky/skin.css" />
</h:head>
<h:body>
    <center>
    <p:panel header="Login Form" style="width: 350;">
        <h:form>
            <h:panelGrid columns="2" cellpadding="2">
                <h:outputLabel for="#{home.username}" value="UserName"/>
                <h:inputText value="#{home.username}" label="UserName"></h:inputText>
                <h:outputLabel for="#{home.password}" value="Password"/>
                <h:inputSecret value="#{home.password}"></h:inputSecret>
                <h:commandButton type="submit" value="Login" action="#{home.validateUser}"></h:commandButton>
            </h:panelGrid>
        </h:form>
    </p:panel>
    <div><h:messages ></h:messages></div>
    </center>
</h:body>
</html>

index.jsp 文件

<jsp:forward page="login.xhtml"></jsp:forward>

还有我的登录操作文件

package com.cation.action;

import java.util.List;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import javax.persistence.Query;

import logon.Users;

public class LoginAction {

    private String username;

    private String password;

    private static final String PERSISTENCE_UNIT_NAME = "Cation";

    private static EntityManagerFactory factory;

    @SuppressWarnings("unchecked")
    public String validateUser() throws Exception {
        factory = Persistence.createEntityManagerFactory(PERSISTENCE_UNIT_NAME);
        EntityManager em = factory.createEntityManager();
        // Read the existing entries and write to console
        Query q = em.createQuery("SELECT u FROM Users u where u.Login='"+username+"'");
        List<Users> userList = q.getResultList();
        Users user = (Users) userList.get(0);

        if(user == null){
            return "error";
        }
        /*// Create new user
        em.getTransaction().begin();
        Users user = new Users();
        user.setName("Tom Johnson");
        user.setLogin("tomj");
        user.setPassword("pass");
        em.persist(user);
        em.getTransaction().commit();

        em.close();*/
        return "home_page";
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

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

问题是当我使用用户名和密码登录时，它显示操作成功，但它没有重定向到主页仍然存在于同一页面中，没有任何显示和 url 显示，如 localhost:8080/Cation/login.xhtml

谁能帮我解决它

4

1 回答 1

2
  1. 返回"home_page?facesRedirect=true"而不是return "home_page";
  2. 我建议这样的登录方法：
  public void login() throws IOException {
     FacesContext       context;
     HttpServletRequest request;
     ExternalContext    externalContext;         

     context = FacesContext.getCurrentInstance();
     request = (HttpServletRequest) context.getExternalContext().getRequest();
     externalContext = context.getExternalContext();

     try { 
        // try to login
        request.login(username, password);
        // login successful so remember logged user
        loggedUser = userDao.findByName(username);
        externalContext.redirect(requestedURI);
     } catch (ServletException e) {
        // Unknown login
        context.addMessage(null, new FacesMessage(FacesMessage.SEVERITY_ERROR, ejbUtils.getMsg("msgUnknownLogin"), null));
        loggedUser = null;
     }
  }

我认为您所做的不会影响用户查看受保护页面的权限。它看起来像测试数据库中现有的用户和密码。它适用于桌面（java se），但不适用于 web（java ee）应用程序，因为在 ee 中，用户可以通过其地址访问页面，而不是通过菜单或按钮。

查找基于表单的登录示例。

于 2013-06-27T14:52:58.017 回答