如何在jsf中从另一个访问一个ManagedBean

Question

I have two managedbean class( UserBean.java & HelloBean.java ) and one index.xhthl class. 我有两个ManagedBean类（ UserBean.java和HelloBean.java ）和一个index.xhthl类。 In HelloBean.java class, I have used @ManagedProperty anotation for accessing the property of UserBean.java and I have a method within HelloBean.java class. 在HelloBean.java类中，我使用@ManagedProperty批注来访问UserBean.java的属性，并且在HelloBean.java类中有一个方法。

here, my classes: 在这里，我的课：

UserBean.java UserBean.java

package com.bean;

import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;


@ManagedBean(name="ubean", eager=true)
@SessionScoped
public class UserBean {

    private String username;

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

HelloBean.java HelloBean.java

package com.bean;

import javax.faces.bean.ManagedBean;
import javax.faces.bean.ManagedProperty;
import javax.faces.bean.RequestScoped;


@ManagedBean(name="hellobean", eager=true)
@RequestScoped
public class HelloBean {

    @ManagedProperty(value="#{ubean}")
    private UserBean mbean;
    private String username;

    public String getUsername() {
        if(mbean!=null){
            username=mbean.getUsername();
        }
        return username;
    }

    public void setMbean(UserBean mbean) {
        this.mbean = mbean;
    }

    public UserBean getMbean() {
        return mbean;
    }

    public void showMsg(){  
        System.out.println("UserName :"+username);
    }
}

And, index.xhtml 而且， index.xhtml

<body>
    <h:form>
        <h:inputText id="username" value="#{ubean.username}"></h:inputText>
        <h:commandButton value="submit" action="#{hellobean.showMsg}"></h:commandButton>
    </h:form>
</body>

I want to invoke the showMsg() method from index.xhtml class. 我想从index.xhtml类调用showMsg()方法。 The method is fired by clicking commandButton , but it always returns null instead of inputText value. 通过单击commandButton会触发该方法，但它始终返回null而不是inputText值。 What's the problem in my codes. 我的代码有什么问题。 Someone, helps... Thanks in advance.. 有人帮忙...提前谢谢..

Answer 1

Here username is the property of UserBean.java class. 这里的username是UserBean.java类的属性。 As a result, you must have to call the username variable through a object of the parent( UserBean.java ) class.So, try it, mbean.getUsername() instead of only username . 结果，您必须通过父类（ UserBean.java ）类的对象调用username变量，因此请尝试使用mbean.getUsername()而不是仅username 。

如何在jsf中从另一个访问一个ManagedBean

问题描述

1 个解决方案

解决方案1
0 已采纳 2014-12-15 15:16:51

如何在jsf中从另一个访问一个ManagedBean

问题描述

1 个解决方案

解决方案1 0 已采纳 2014-12-15 15:16:51

解决方案1
0 已采纳 2014-12-15 15:16:51