Java 导航案例在JSF中不起作用
我们正在进行我们的第一个JSF项目,我们遇到了一些问题。我们正在创建登录功能,当我们点击登录按钮时,它会抛出:Java 导航案例在JSF中不起作用,java,jsf,web.xml,faces-config,Java,Jsf,Web.xml,Faces Config,我们正在进行我们的第一个JSF项目,我们遇到了一些问题。我们正在创建登录功能,当我们点击登录按钮时,它会抛出: IllegalArgumentException-null 来源 NullPointerException- Servlet[Faces]的Servlet.service() Servlet]在具有路径的上下文中 [/jsf blank]引发异常 你知道它为什么不起作用吗?请启发我们 下面是我们的用户bean: public class User { private lon
- IllegalArgumentException-null 来源
- NullPointerException- Servlet[Faces]的Servlet.service() Servlet]在具有路径的上下文中 [/jsf blank]引发异常
public class User
{
private long id;
private String username;
private String password;
public User()
{
}
public User(String username, String password)
{
this.username = username;
this.password = password;
}
public User(long id, String username, String password)
{
super();
this.id = id;
this.username = username;
this.password = password;
}
public String getNextPage()
{
return "failure"; //or "admin" or "client"
}
public long getId()
{
return id;
}
public void setId(long id)
{
this.id = id;
}
public String getUsername()
{
return username;
}
public String getPassword()
{
return password;
}
public void setUsername(String username)
{
this.username = username;
}
public void setPassword(String password)
{
this.password = password;
}
}
我们的login.jsp页面:
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="f" uri="http://java.sun.com/jsf/core"%>
<%@ taglib prefix="h" uri="http://java.sun.com/jsf/html"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Login</title>
</head>
<body>
<f:view>
<h:form>
Username: <h:inputText value="#{userBean.username}"></h:inputText>
<br />
Password: <h:inputText value="#{userBean.password}"></h:inputText>
<br />
<h:commandButton value="Login" action="#{userBean.getNextPage}" ></h:commandButton>
</h:form>
</f:view>
</body>
</html>
登录
用户名:
密码:
我们的faces-config.xml:
<?xml version="1.0"?>
<faces-config xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-facesconfig_2_0.xsd"
version="2.0">
<managed-bean>
<managed-bean-name>userBean</managed-bean-name>
<managed-bean-class>data_layer.model.User</managed-bean-class>
<managed-bean-scope>session</managed-bean-scope>
</managed-bean>
<navigation-rule>
<from-view-id>/login.jsp</from-view-id>
<navigation-case>
<from-action>#{userBean.getNextPage}</from-action>
<from-outcome>admin</from-outcome>
<to-view-id>/admin.jsp</to-view-id>
</navigation-case>
<navigation-case>
<from-action>#{userBean.getNextPage}</from-action>
<from-outcome>failure</from-outcome>
<to-view-id>/failure.jsp</to-view-id>
</navigation-case>
<navigation-case>
<from-action>#{userBean.getNextPage}</from-action>
<from-outcome>client</from-outcome>
<to-view-id>/client.jsp</to-view-id>
</navigation-case>
</navigation-rule>
</faces-config>
用户bean
数据\u layer.model.User
一场
/login.jsp
#{userBean.getNextPage}
管理
/admin.jsp
#{userBean.getNextPage}
失败
/failure.jsp
#{userBean.getNextPage}
客户
/client.jsp
我们的web.xml:
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
version="2.5">
<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>*.jsf</url-pattern>
</servlet-mapping>
<context-param>
<param-name>javax.faces.CONFIG_FILES</param-name>
<param-value>/WEB-INF/faces-config.xml</param-value>
</context-param>
<context-param>
<param-name>javax.faces.PROJECT_STAGE</param-name>
<param-value>Development</param-value>
</context-param>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
<!-- <welcome-file>index.html</welcome-file> -->
</welcome-file-list>
</web-app>
Facesservlet
javax.faces.webapp.FacesServlet
1.
Facesservlet
*.jsf
javax.faces.CONFIG_文件
/WEB-INF/faces-config.xml
javax.faces.PROJECT_阶段
发展
index.jsp
我们的目录结构是:
您正在混合使用JSF1.x和JSF2.x方法。也许你读的是一本过时的书/教程,它是针对JSF1.x的,而IDE是自动生成JSF2.x的 默认情况下,JSF2.0不再支持JSP。遗留的JSP已经成功地提供了更优越的模板功能。尽管可以将JSF2.0配置为再次使用老式JSP,但我强烈建议不要这样做。而是将
login.jsp
重写为login.xhtml
:
<!DOCTYPE html>
<html lang="en"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:ui="http://java.sun.com/jsf/facelets">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Login</title>
</head>
<body>
<h:form>
Username: <h:inputText value="#{userBean.username}" />
<br />
Password: <h:inputText value="#{userBean.password}" />
<br />
<h:commandButton value="Login" action="#{userBean.getNextPage}" />
</h:form>
</body>
使用新的隐式导航,默认情况下,结果将被视为视图的文件名。您已经做得很好了,所以根本不需要这些导航规则。您混合了JSF1.x和JSF2.x方法。也许你读的是一本过时的书/教程,它是针对JSF1.x的,而IDE是自动生成JSF2.x的 默认情况下,JSF2.0不再支持JSP。遗留的JSP已经成功地提供了更优越的模板功能。尽管可以将JSF2.0配置为再次使用老式JSP,但我强烈建议不要这样做。而是将
login.jsp
重写为login.xhtml
:
<!DOCTYPE html>
<html lang="en"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:ui="http://java.sun.com/jsf/facelets">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Login</title>
</head>
<body>
<h:form>
Username: <h:inputText value="#{userBean.username}" />
<br />
Password: <h:inputText value="#{userBean.password}" />
<br />
<h:commandButton value="Login" action="#{userBean.getNextPage}" />
</h:form>
</body>
使用新的隐式导航,默认情况下,结果将被视为视图的文件名。你已经做得很好了,所以你根本不需要那些导航规则