我将第一步迈入JSF框架。我这样制作这些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}" />
</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;
}
}
在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>
的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>
我有这些问题: 1 - 在输入文本上我看到#{utente.nome}打印后点击按钮(为什么?目前我没有任何关于bean的东西)。 2 - 当我将它发送到服务器时,没有任何反应,并且将打印字符串“#{utente.nome}”。为什么呢?
答案 0 :(得分:1)
当web.xml
未正确配置为至少Servlet 2.4时,可能会发生这种情况。那时EL表达式(那些#{}
事物)将不会被评估。由于你使用的是复古的JSF 1.1,我敢打赌你也在使用老式的servlet容器。确保它支持Servlet 2.4并确保web.xml
至少声明为:
<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">
或者,如果您使用的是Servlet 2.5兼容容器,请确保web.xml
声明如下:
<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">
(并考虑将JSF升级到1.2或更好,2.0)
您还需要确保没有任何特定于servlet容器的库,例如servlet-api.jar
,j2ee.jar
,javaee.jar
,jsp-api.jar
等等。徘徊在webapp的/WEB-INF/lib
文件夹中,或者更糟糕的是,在JRE/lib/ext
文件夹中。 /WEB-INF/lib
文件夹应仅包含JSF库(以及特定于webapp本身的任何其他库)。 JRE/lib/ext
文件夹应保持不变。