无法从XHTML页面访问ManagedBean的方法
[英]Not able to access method of a managedbean from a xhtml page
问题描述
Here is my project structure: eclipse project structure 
这是我的项目结构： Eclipse项目结构
this is my HelloWorld.java 这是我的HelloWorld.java
package com.tutorialspoint.test;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;
@ManagedBean(name = "helloWorld")
@RequestScoped
public class HelloWorld
{
public HelloWorld()
{
System.out.println("HelloWorld started!");
}
public String getMessage()
{
return "JSF2!";
}
}
and this is my index.xhtml 这是我的index.xhtml
<?xml version="1.0" encoding="ISO-8859-1" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html lang="en"
xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:h="http://java.sun.com/jsf/html">
<h:head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
<title>Insert title here</title>
</h:head>
<h:body>
HEllo form <h:outputLabel value="#{helloWorld.getMessage()}" />
</h:body>
</h:body>
</html>
the output that i get after entering localhost:8080/demojsf/ is HEllo form and not HEllo from jsf2. 输入localhost：8080 / demojsf /后得到的输出是HEllo形式，而不是jsf2的HEllo。 What is wrong here? 怎么了
3 个解决方案
解决方案1
2 已采纳 2013-07-26 04:46:56
Below is the way of using h:outputLabel using for attribute of h:outputLabel 以下是将h:outputLabel for h:outputLabel属性的方法
public class HelloWorld
{
public String message= "JSF2!";
public HelloWorld()
{
System.out.println("HelloWorld started!");
}
public String getMessage()
{
return message;
}
}
<h:outputLabel for="msgID" value="HEllo form " />
<h:outputText id="msgID" value="#{helloWorld.message}"/>
解决方案2
1 2013-07-26 07:10:51
The h:outputLabel will be calling the getter method of the attribute. h：outputLabel将调用属性的getter方法。 So change the code as below, 因此，如下更改代码，
<h:outputLabel value="#{helloWorld.message}" />
Please find below a working code sample for me, 请在下面找到适合我的工作代码示例，
<!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://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:a4j="http://richfaces.org/a4j"
xmlns:rich="http://richfaces.org/rich">
<head>
<title>JSF Hello World</title>
</head>
<body>
<f:view>
<h:form>
<h2>
<h:outputLabel value="#{jsfHelloWorldBean.message}" />
</h2>
</h:form>
</f:view>
</body>
</html>
And my bean 还有我的豆
package devmanuals;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;
@ManagedBean(name="jsfHelloWorldBean")
@RequestScoped
public class JsfHelloWorldBean {
//String message;
public String getMessage(){
return "JSF!2";
}
}
解决方案3
1 2013-07-26 07:58:31
your code works fine on my side. 您的代码在我这边工作正常。 I used JSF2.1, JDK7, and Netbeans 7.3, well except for the double </h:body> 我使用了JSF2.1，JDK7和Netbeans 7.3，除了双重</h:body>
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