我尝试使用 JSF 配置 Servlet 过滤器。我在这里遇到很多问题，我也使用 PrimeFaces。
这是我的 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" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>JsfEaxmples</display-name>
<context-param>
<param-name>javax.faces.STATE_SAVING_METHOD</param-name>
<param-value>server</param-value>
</context-param>
<context-param>
<param-name>javax.faces.DEFAULT_SUFFIX</param-name>
<param-value>.xhtml</param-value>
</context-param>
<context-param>
<param-name>javax.faces.PROJECT_STAGE</param-name>
<param-value>Development</param-value>
</context-param>
<context-param>
<param-name>javax.faces.FACELETS_REFRESH_PERIOD</param-name>
<param-value>1</param-value>
</context-param>
<context-param>
<param-name>javax.faces.FACELETS_SKIP_COMMENTS</param-name>
<param-value>true</param-value>
</context-param>
<context-param>
<param-name>javax.faces.SEPARATOR_CHAR</param-name>
<param-value>-</param-value>
</context-param>
<context-param>
<param-name>org.richfaces.skin</param-name>
<param-value>classic</param-value>
</context-param>
<context-param>
<param-name>facelets.BUILD_BEFORE_RESTORE</param-name>
<param-value>true</param-value>
</context-param>
<context-param>
<param-name>facelets.RECREATE_VALUE_EXPRESSION_ON_BUILD_BEFORE_RESTORE</param-name>
<param-value>true</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>*.xhtml</url-pattern>
</servlet-mapping>
<context-param>
<param-name>javax.servlet.jsp.jstl.fmt.localizationContext</param-name>
<param-value>resources.application</param-value>
</context-param>
<listener>
<listener-class>com.sun.faces.config.ConfigureListener</listener-class>
</listener>
<filter>
<filter-name>sessionfilter</filter-name>
<filter-class>com.invoice.sessionfilter</filter-class>
</filter>
<filter-mapping>
<filter-name>sessionfilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
首先我使用这样的过滤器<url-pattern>jsf invoice system/*</url-pattern>这完全不起作用，所以我改为<url-pattern>/*</url-pattern>这个有回应，但在我的过滤中出现了很多问题
我用过滤器检查以下过程
- 如果会话不存在，用户应重定向到登录页面
- 如果会话存在并且用户进入登录页面，则不应重定向他
添加过滤器 PrimeFaces 组件后外观发生变化。添加过滤器后，无法正确导航。
这是我的过滤器代码。
package com.invoice;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
public class sessionfilter implements Filter {
String uname;
/**
* Default constructor.
*/
public sessionfilter() {
// TODO Auto-generated constructor stub
}
/**
* @see Filter#destroy()
*/
public void destroy() {
// TODO Auto-generated method stub
}
/**
* @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
*/
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
// place your code here
// pass the request along the filter chain
HttpServletRequest req = (HttpServletRequest) request;
HttpServletResponse resp = (HttpServletResponse) response;
String pagerequested = req.getRequestURL().toString();
HttpSession ses = req.getSession(true);
//uname=(String)ses.getAttribute("uname");//null pointer exception
if (pagerequested.contains("Login.xhtml") && uname == null)// if user logs in to this for first time
{
chain.doFilter(request, response);
} else if (uname != null && pagerequested.contains("Login.xhtml")) { // if session exists and user tries to go to login page he should be redirected
resp.sendRedirect("invoiceinfo.xhtml");
} else if (uname == null && !pagerequested.contains("Login.xhtml")) {
try {
uname = (String) ses.getAttribute("uname");
chain.doFilter(request, response);
} catch (Exception e) {
resp.sendRedirect("Login.xhtml");
}
}
}
/**
* @see Filter#init(FilterConfig)
*/
public void init(FilterConfig fConfig) throws ServletException {
// TODO Auto-generated method stub
}
}
这是我在会话范围内的登录信息，我在这里不使用注释
package com.invoice;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import javax.faces.bean.SessionScoped;
import javax.faces.context.FacesContext;
import javax.servlet.http.HttpSession;
@SessionScoped
public class login {
String username, userpassword, errormess, navipg;
public String getNavipg() {
return navipg;
}
public void setNavipg(String navipg) {
this.navipg = navipg;
}
public String getErrormess() {
return errormess;
}
public void setErrormess(String errormess) {
this.errormess = errormess;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getUserpassword() {
return userpassword;
}
public void setUserpassword(String userpassword) {
this.userpassword = userpassword;
}
public String navigate() {
try {
Class.forName("oracle.jdbc.driver.OracleDriver");
Connection con = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:XE", "invoice", "google");
Statement stmt = con.createStatement();
ResultSet rs = stmt.executeQuery("select username,password from usertable where username='" + username + "' and password='" + userpassword + "' ");
if (rs.next()) {
setErrormess("");
FacesContext.getCurrentInstance().getExternalContext().getSessionMap().put("uname", this.username);
navipg = "invoiceinfo";
} else {
setErrormess("Invalid Login credentials");
username = "";
navipg = "Login";
}
} catch (Exception e) {
e.printStackTrace();
}
return navipg;
}
public String logout() {
FacesContext.getCurrentInstance().getExternalContext().invalidateSession();
return "Login";
}
}
我的登录页面是
<!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:ui="http://java.sun.com/jsf/facelets"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:p="http://primefaces.org/ui">
<h:head>
<style type="text/css">
.ui-panelgrid tr,
.ui-panelgrid td {
border: none;
}
</style>
</h:head>
<h:body>
<h:form>
<p:panelGrid columns="3" id="pnl" border= "0">
<f:facet name="header"><p:graphicImage value="login.jpg"/></f:facet>
<h:outputText value="Username"/>
<p:inputText id="uname" value="#{login.username}" required="true" label="username"/>
<p:message for="uname"/>
<h:outputText value="Password"/>
<p:password id="pass" value="#{login.userpassword}" required="true" label="password"/>
<p:message for="pass"/>
<p:commandButton value="Login" action="#{login.navigate}" ajax="false"/>
<p:button value="Reset" />
</p:panelGrid>
<h1><h:outputText value="#{login.errormess}"/></h1>
</h:form>
</h:body>
</html>
我完全被困在这里，不知道如何继续过滤。
