5

我正在通过引用此链接来实现网络过滤器

我的代码是

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"
    id="WebApp_ID" version="2.5">
    <display-name>project_name</display-name>
    <welcome-file-list>
        <welcome-file>/project_name/faces/jsp/HomePage.jsp</welcome-file>
    </welcome-file-list>
    <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>
    <context-param>
        <description>State saving method: 'client' or 'server' (=default). See JSF Specification 2.5.2</description>
        <param-name>javax.faces.STATE_SAVING_METHOD</param-name>
        <param-value>client</param-value>
    </context-param>
    <context-param>
        <param-name>javax.servlet.jsp.jstl.fmt.localizationContext</param-name>
        <param-value>resources.application</param-value>
    </context-param>

    <context-param>
        <param-name>org.richfaces.CONTROL_SKINNING</param-name>
        <param-value>enable</param-value>
    </context-param>
    <context-param>
        <param-name>org.richfaces.LoadScriptStrategy</param-name>
        <param-value>ALL</param-value>
    </context-param>
    <context-param>
        <param-name>org.richfaces.LoadStyleStrategy</param-name>
        <param-value>ALL</param-value>
    </context-param>
    <context-param>
        <param-name>org.ajax4jsf.DEFAULT_EXPIRE</param-name>
        <param-value>2764800</param-value>
    </context-param>
    <context-param>
        <param-name>org.apache.myfaces.ERROR_HANDLING</param-name>
        <param-value>false</param-value>
    </context-param>
    <context-param>
        <param-name>org.ajax4jsf.handleViewExpiredOnClient</param-name>
        <param-value>true</param-value>
    </context-param>

    <filter>
        <display-name>RichFaces Filter</display-name>
        <filter-name>richfaces</filter-name>
        <filter-class>org.ajax4jsf.Filter</filter-class>
        <init-param>
            <param-name>createTempFiles</param-name>
            <param-value>false</param-value>
        </init-param>
        <init-param>
            <param-name>maxRequestSize</param-name>
            <param-value>20000000</param-value>
        </init-param>
        <init-param>
            <param-name>enable-cache</param-name>
            <param-value>true</param-value>
        </init-param>


    </filter>

    <filter>
        <filter-name>loginFilter</filter-name>
        <filter-class>com.common.LoginFilter</filter-class>
    </filter>

     <filter-mapping>
        <filter-name>loginFilter</filter-name>
        <url-pattern>/faces/*</url-pattern>
    </filter-mapping>

    <filter-mapping>
        <filter-name>richfaces</filter-name>
        <servlet-name>Faces Servlet</servlet-name>
        <dispatcher>REQUEST</dispatcher>
        <dispatcher>FORWARD</dispatcher>
        <dispatcher>INCLUDE</dispatcher>
    </filter-mapping>

    <listener>
        <listener-class>com.sun.faces.config.ConfigureListener</listener-class>
    </listener>
    <servlet-mapping>
        <servlet-name>Faces Servlet</servlet-name>
        <url-pattern>*.jsf</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>Faces Servlet</servlet-name>
        <url-pattern>*.faces</url-pattern>
    </servlet-mapping>
    <servlet>
        <servlet-name>Resource Servlet</servlet-name>
        <servlet-class>org.primefaces.resource.ResourceServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>Resource Servlet</servlet-name>
        <url-pattern>/primefaces_resource/*</url-pattern>
    </servlet-mapping>
</web-app>

登录过滤器类

public class LoginFilter implements Filter {

    @Override
    public void init(FilterConfig config) throws ServletException {
        // If you have any <init-param> in web.xml, then you could get them
        // here by config.getInitParameter("name") and assign it as field.
    }

    @Override
    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
        System.out.println("Inside Login Filter");
        HttpServletRequest request = (HttpServletRequest) req;
        HttpServletResponse response = (HttpServletResponse) res;
        HttpSession session = request.getSession(false);
System.out.println("session..."+ session);
        if (session == null || session.getAttribute(IConstants.HAS_USER_ID) == null) {
            response.sendRedirect(request.getContextPath() + "/faces/jsp/login.jsp"); // No logged-in user found, so redirect to login page.
        } else {
            chain.doFilter(req, res); // Logged-in user found, so just continue request.
        }
    }

    @Override
    public void destroy() {
        // If you have assigned any expensive resources as field of
        // this Filter class, then you could clean/close them here.
    }

}

登录成功后设置会话变量

FacesContext.getCurrentInstance().getExternalContext()
                .getSessionMap()
                .put(IConstants.HAS_USER_ID, IConstants.HAS_USER_ID);

但我面临的问题是我一直低于日志

Inside Login Filter
session...org.apache.catalina.session.StandardSessionFacade@1c134e1

在控制台和页面永远不会重定向到下一页或登录页面。

4

2 回答 2

8

这是因为您的过滤器也匹配登录页面上的请求。它基本上是在无限循环中运行，重定向到登录页面。基本上有2个选项：

  1. 确保过滤器映射未覆盖登录 URL。将受限制的页面放在 , 等文件夹/secured/*中，/app/*并将过滤器映射到该 URL 模式，并将登录页面放在外面。

  2. 如果当前未请求登录 URL，请检查过滤器。

    @Override
public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
    HttpServletRequest request = (HttpServletRequest) req;
    HttpServletResponse response = (HttpServletResponse) res;
    HttpSession session = request.getSession(false);
    boolean loggedIn = (session != null) ? session.getAttribute(IConstants.HAS_USER_ID) != null : false;
    String loginURL = request.getContextPath() + "/faces/jsp/login.jsp"; 

    if (!loggedIn && !request.getRequestURI().equals(loginURL)) {       
        response.sendRedirect(loginURL);
    } else {
        chain.doFilter(request, response);
    }
}
于 2013-01-16T10:42:48.110 回答
0

我实现了一个缓存过滤器。这是代码。看看这是否有帮助

在您的 web.xml 中添加以下内容

<filter>
    <filter-name>cache</filter-name>
    <filter-class>au.com.webapp.config.CacheFilter</filter-class>
</filter>
<filter-mapping>
    <filter-name>cache</filter-name>
    <url-pattern>*.xhtml</url-pattern>
</filter-mapping>

在您的 au.com.webapp.config 包中创建一个类 CacheFilter，如下所示：

package au.com.webapp.config;

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.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class CacheFilter implements Filter {
    private static long maxAge = 86400 * 30; // 30 days in seconds

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {
        HttpServletResponse httpResponse = (HttpServletResponse) response;
        String uri = ((HttpServletRequest) request).getRequestURI();
        if (uri.contains(".js") || uri.contains(".css") || uri.contains(".svg") || uri.contains(".gif")
                || uri.contains(".woff") || uri.contains(".png")) {
            httpResponse.setHeader("Cache-Control", "max-age=" + maxAge);
        }
        chain.doFilter(request, response);
    }

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        System.out.println("Cache Filter started: ");

    }

    @Override
    public void destroy() {
    }
}
于 2016-02-23T02:21:35.760 回答