JSF - First steps - Bean doesnt work
Im moving first steps into JSF framework. I so make these jsp/bean :
index.jsp :
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<%@ taglib prefix="f" uri="http://java.sun.com/jsf/core" %>
<%@ taglib prefix="h" uri="http://java.sun.com/jsf/html" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Home</title>
</head>
<body>
<f:view>
<h:form>
<h:outputText value="Inserisci il tuo nome" />
<h:inputText value="#{utente.nome}" />
<h:commandButton value="Cliccami" action="avanti" />
</h:form>
</f:view>
</body>
</html>
pagina1.jsp :
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h" %>
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Login Page</title>
</head>
<body>
<f:view>
<h:form id="LoginApplication">
<h:panelGrid id="lpg" columns="2">
<h:outputText value="Benvenuto nella tua prima pagina JSP " />
<h:outputText value="#{utente.nome}" />
<开发者_运维百科;/h:panelGrid>
</h:form>
</f:view>
</body>
</html>
user.java
package myPack;
public class user{
private String nome;
public user(){}
public String getNome(){
return nome;
}
public void setNome(String nome) {
this.nome=nome;
}
}
faces.config.xml
<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE faces-config PUBLIC
"-//Sun Microsystems, Inc.//DTD JavaServer Faces Config 1.1//EN"
"http://java.sun.com/dtd/web-facesconfig_1_1.dtd">
<!-- =========== FULL CONFIGURATION FILE ================================== -->
<faces-config>
<navigation-rule>
<from-view-id>/index.jsp</from-view-id>
<navigation-case>
<from-outcome>avanti</from-outcome>
<to-view-id>/pagina1.jsp</to-view-id>
</navigation-case>
</navigation-rule>
<managed-bean>
<managed-bean-name>utente</managed-bean-name>
<managed-bean-class>myPack.user</managed-bean-class>
<managed-bean-scope>request</managed-bean-scope>
</managed-bean>
</faces-config>
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<context-param>
<param-name>javax.faces.CONFIG_FILES</param-name>
<param-value>/WEB-INF/faces-config.xml</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.jsp</welcome-file>
</welcome-file-list>
</web-app>
and i have these problems : 1 - on the input text i see the #{utente.nome} printed before click on the button (why? at the moment i don't have nothing on the bean). 2 - when i send it to the server, nothing happen, and the string "#{utente.nome}" will printed. Why?
This can happen when the web.xml is not properly configured as at least Servlet 2.4. The EL expressions (those #{} things) won't be evaluated then. Since you're using the vintage JSF 1.1, I bet that you're using a vintage servletcontainer as well. Ensure that it supports Servlet 2.4 and ensure that the web.xml is declared at least as:
<web-app
xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
version="2.4">
Or if you're using a Servlet 2.5 compatible container, then ensure that web.xml is declared as follows:
<web-app
xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_5.xsd"
version="2.5">
(and consider upgrading JSF to 1.2 or, better, 2.0)
You also need to ensure that you don't have any servletcontainer specific libraries like servlet-api.jar, j2ee.jar, javaee.jar, jsp-api.jar, etc..etc.. wandering around in webapp's /WEB-INF/lib folder or even worse, in the JRE/lib/ext folder. The /WEB-INF/lib folder should contain only the JSF libraries (and any other libraries specific to the webapp itself). The JRE/lib/ext folder should be kept untouched.
加载中,请稍侯......
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