单击按钮后无重定向

Question

我是 jsf 的新手，正在尝试构建应用程序。问题是当我单击登录命令按钮时没有任何反应。所以我输入了一些打印行，它告诉我与数据库的连接存在并且参数有效但它不会重定向。

这里是index.xhtml

<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:h="http://xmlns.jcp.org/jsf/html"
      xmlns:p="http://primefaces.org/ui">
    <h:head>
        <title>Dezurstvo</title>
    </h:head>
    <h:body>
        Login
        <br />
        <h:form>
            <p:growl id="msgs" showDetail="true"/>
            <h:panelGrid columns="2" cellpadding="5">
                <h:outputText value="Username"/>
                <p:inputText value="#{logIn.username}" required="true"/>
                <h:outputText value="Password"/>
                <p:password id="pass" value="#{logIn.password}" feedback="false" required="true"/>
            </h:panelGrid>
            <p:commandButton value="Login" action="#{logIn.loadUser()}" update="msgs" />
            <p:commandButton value="Regisracija" />
        </h:form>
        <h:link outcome="adminMain" value="Primefaces welcome page" />
    </h:body>
</html>

NavigationBean class

package beans;

import dataBeans.Korisnik;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;
import javax.faces.context.FacesContext;
import javax.servlet.http.HttpSession;


@ManagedBean(name = "navigation")
@RequestScoped
class NavigationBean {
        public String getHomepage(){
        FacesContext context = FacesContext.getCurrentInstance();
        HttpSession session = (HttpSession) context.getExternalContext().getSession(false);
        Korisnik kor = (Korisnik)session.getAttribute("username");
        if(!"A".equals(kor.getStatus()) || !"D".equals(kor.getStatus()) || !"N".equals(kor.getStatus()))
            return "index";
        else if("A".equals(kor.getStatus()))
            return "adminMain";
        else if("D".equals(kor.getStatus()))
            return "demonstratorMain";
        else if("N".equals(kor.getStatus()))
            return "nastavnikMain";
        return "";
    }
    public static String redirect(String status){
        if(!"A".equals(status) || !"D".equals(status) || !"N".equals(status))
            return "index";
        else if("A".equals(status))
            return "adminMain";
        else if("D".equals(status))
            return "demonstratorMain";
        else if("N".equals(status))
            return "nastavnikMain";
        return "error";
    }
}

登录 Bean

  package beans;

import dataBeans.Korisnik;
import javax.faces.application.FacesMessage;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.event.ActionEvent;
import javax.servlet.http.HttpSession;

@ManagedBean(name="logIn")
@RequestScoped
public class LoginBean {
    private String user;
    private String pass;

    private UIComponent component;
    public UIComponent getComponent() {
        return component;
    }
    public void setComponent(UIComponent component) {
        this.component = component;
    }

    public LoginBean()  {}

    /**
     * @return the user
     */
    public String getUsername() {
        return user;
    }

    /**
     * @param username the user to set
     */
    public void setUsername(String username) {
        this.user = username;
    }

    /**
     * @return the pass
     */
    public String getPassword() {
        return pass;
    }

    /**
     * @param password the pass to set
     */
    public void setPassword(String password) {
        this.pass = password;
    }


    //Loading user into session
    public String loadUser() {
        FacesContext context = FacesContext.getCurrentInstance();
        HttpSession session = (HttpSession) context.getExternalContext().getSession(false);
        FacesMessage msg;
        Korisnik kor = Korisnik.getUser(user);

        if (user.equals(kor.getUsername())) {
            System.out.println( "user je = " + kor.getUsername());
            //User exists in database
            if (pass.equals(kor.getPassword())) {
                System.out.println( "Sifra je = " + kor.getPassword());
                System.out.println( "Status = " + kor.getStatus());
                //Pasword is OK              
                session.setAttribute(user, kor);
                return NavigationBean.redirect(kor.getStatus());
            } else {
                //Wrong pass
              //  System.out.println( "Sifra je = " + kor.getPassword());
                msg = new FacesMessage(FacesMessage.SEVERITY_WARN, "", "Pogrešna šifra.");
                return msg.toString();
            }
        } else {
            //Wrog user
            msg = new FacesMessage(FacesMessage.SEVERITY_WARN, "", "Korisnik sa datim korisničkim imenom ne postoji.");
            return msg.toString();
        }
    }

    public String signOut(){
        FacesContext context = FacesContext.getCurrentInstance();
        HttpSession session = (HttpSession) context.getExternalContext().getSession(false);
        session.invalidate();
        return "logIn";
    }
}

人脸配置

<?xml version='1.0' encoding='UTF-8'?>
<faces-config version="2.2"
              xmlns="http://xmlns.jcp.org/xml/ns/javaee"
              xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
              xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-facesconfig_2_2.xsd">

    <navigation-rule>
        <from-view-id>/index.xhtml</from-view-id>
        <navigation-case>
            <from-outcome>adminMain</from-outcome>
            <to-view-id>admin/adminMain.xhtml</to-view-id>
        </navigation-case>
        <navigation-case>
            <from-outcome>demonstratorMain</from-outcome>
            <to-view-id>demonstrator/demonstratorMain.xhtml</to-view-id>
        </navigation-case>
        <navigation-case>
            <from-outcome>nastavnikMain</from-outcome>
            <to-view-id>nastavnik/nastavnikMain.xhtml</to-view-id>
        </navigation-case>
        <navigation-case>
            <from-outcome>error</from-outcome>
            <to-view-id>error.xhtml</to-view-id>
        </navigation-case>
    </navigation-rule>
</faces-config>

和网络

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.1" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd">
    <context-param>
        <param-name>javax.faces.PROJECT_STAGE</param-name>
        <param-value>Development</param-value>
    </context-param>
    <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>
    </servlet-mapping>
    <session-config>
        <session-timeout>
            30
        </session-timeout>
    </session-config>
    <welcome-file-list>
        <welcome-file>faces/index.xhtml</welcome-file>
    </welcome-file-list>

</web-app>

当单击按钮时，它从 LoginBean 调用函数 loadUser，他从 NavigationBean 调用重定向，应该根据用户的状态将我重定向到特定页面，但没有任何反应。另外，当我输入错误的数据时，它会显示

Warning:   JSF1091: No mime type could be found for file /javax.faces.application.FacesMessage@67cc4160.  To resolve this, add a mime-type mapping to the applications web.xml.
Warning:   JSF1064: Unable to find or serve resource, /javax.faces.application.FacesMessage@67cc4160.

不知道这是否与此有关。

我正在使用 glassfish server 4.1、primefaces 5.0、wamp、netbeans 8.0.2、jsf 2.2

如果需要，这里是树视图

Answer 1

来自 JSF 操作方法的字符串 return 必须代表 JSF 视图 ID，如下所示：

public String submit() {
    // ...
    return "/some.xhtml";
}

或真正的重定向（您所有的情况都是 simple forwards, not redirects，也正确使用此术语）：

public String submit() {
    // ...
    return "/some.xhtml?faces-redirect=true";
}

或 null 与 "return to current page":

相同

public String submit() {
    // ...
    return null;
}

如果您在 faces-config.xml 旧 JSF 1.x 样式中使用导航案例，那么 returned 字符串也可以表示导航案例结果。

关于您的具体问题，您在服务器日志中收到以下警告：

Warning:   JSF1064: Unable to find or serve resource, /javax.faces.application.FacesMessage@67cc4160.

这意味着 JSF 没有将字符串值 /javax.faces.application.FacesMessage@67cc4160 识别为有效的 JSF 视图 ID。这基本上意味着您在操作方法中确实喜欢以下操作：

public String submit() {
    // ...
    return "/javax.faces.application.FacesMessage@67cc4160";
}

事实上，您在下面几行中正是这样做的！

    } else {
        //Wrong pass
        //  System.out.println( "Sifra je = " + kor.getPassword());
        msg = new FacesMessage(FacesMessage.SEVERITY_WARN, "", "Pogrešna šifra.");
        return msg.toString();
    }
} else {
    //Wrog user
    msg = new FacesMessage(FacesMessage.SEVERITY_WARN, "", "Korisnik sa datim korisničkim imenom ne postoji.");
    return msg.toString();
}

这不是 return 到当前视图的正确方法，并在上下文中添加了面孔消息。替换 return 行如下：

context.addMessage(null, msg);
return null;

另请参阅：

How to navigate in JSF? How to make URL reflect current page (and not previous one)
Creating FacesMessage in action method outside JSF conversion/validation mechanism?

单击按钮后无重定向

No redirection after button click

jsf

redirect

primefaces

jsf-2

另请参阅：