CAS 客户端与一般Web项目集成

这一段时间有同事在问CAS -Client的问题这里就基本问分析一下

1）由于CAS-Server 登录后客户端会记入自动session中（部署WebApp-Server） 

    所以我们只需要获取对应的Principal 在获取其中的信息

2）根据Principal 注册登录

HttpServletResponse resp = (HttpServletResponse)response;
		HttpSession session = req.getSession();
		if (session != null) {
			Object obj = session.getAttribute(AbstractCasFilter.CONST_CAS_ASSERTION);
			if (obj != null) {
				Assertion assertion = (Assertion)obj;
				AttributePrincipal p= assertion.getPrincipal();
				session.setAttribute("user", true);
			}
			
		}

3）定义权限过虑器

package com.zk.xx.login.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.RequestDispatcher;
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;

import org.jasig.cas.client.authentication.AttributePrincipal;
import org.jasig.cas.client.util.AbstractCasFilter;
import org.jasig.cas.client.validation.Assertion;

/**
 * Servlet Filter implementation class LoginFilter
 * @author LiuQing
 * 2010-10-05 11:45:56
 */
@WebFilter("/*")
public class LoginFilter implements Filter {

    /**
     * Default constructor. 
     */
    public LoginFilter() {
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see Filter#destroy()
	 */
	public void destroy() {
		// TODO Auto-generated method stub
	}

	
	/**
	 * @see Filter#init(FilterConfig)
	 */
	public void init(FilterConfig fConfig) throws ServletException {
		// TODO Auto-generated method stub
	}

	
	@Override
	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		HttpServletRequest req = (HttpServletRequest)request;
		//String uri = req.getServletContext().getContextPath();
		String actionName = req.getServletPath();
		//System.out.println(uri + " " + m);
		HttpServletResponse resp = (HttpServletResponse)response;
		HttpSession session = req.getSession();
		if (session != null) {
			Object obj = session.getAttribute(AbstractCasFilter.CONST_CAS_ASSERTION);
			if (obj != null) {
				Assertion assertion = (Assertion)obj;
				AttributePrincipal p= assertion.getPrincipal();
				session.setAttribute("user", true);
			}
			
		}
		
		
		if ("/login".equals(actionName)) {
		    req.getSession(true).setAttribute("user",true);	
		}
		else if ("/logout".equals(actionName)) {
			if (req.getSession() != null) {
				req.getSession().removeAttribute("user");
			}
		}
		if (req.getSession() == null || req.getSession().getAttribute("user") == null) {
		    RequestDispatcher disp = req.getRequestDispatcher("/login.jsp");
		    disp.forward(req, resp);
		}
		else {
			
			chain.doFilter(req, resp);
		}
		
	}

}

4）web.xml 文件

<?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_2_5.xsd"
	id="WebApp_ID" version="2.5">
	<display-name>demo1</display-name>

	<context-param>
		<param-name>serverName</param-name>
		<param-value>http://localhost:1010</param-value>
	</context-param>
	<filter>
		<filter-name>SsoSession</filter-name>
		<filter-class>org.jasig.cas.client.session.SingleSignOutFilter</filter-class>
	</filter>

	<filter>
		<filter-name>CAS Authentication Filter</filter-name>
		<filter-class>org.jasig.cas.client.authentication.AuthenticationFilter</filter-class>
		<init-param>
			<param-name>casServerLoginUrl</param-name>
			<param-value>https://localhost/cas/login</param-value>
		</init-param>
		<init-param>
			<param-name>ignorePattern</param-name>
			<param-value>http://localhost:1010/demoSSn01/login.jsp|/static/css/|/static/js/|http://localhost:1010/demoSSn01/$|http://localhost:1010/demoSSn01/login$|http://localhost:1010/demoSSn01/logout$</param-value>
		</init-param>
	</filter>

	<filter>
		<filter-name>CAS Validation Filter</filter-name>
		<filter-class>org.jasig.cas.client.validation.Cas20ProxyReceivingTicketValidationFilter</filter-class>
		<init-param>
			<param-name>casServerUrlPrefix</param-name>
			<param-value>https://localhost/cas</param-value>
		</init-param>
		<init-param>
			<param-name>serverName</param-name>
			<param-value>http://localhost:1010</param-value>
		</init-param>
	</filter>

	<filter>
		<filter-name>CAS HttpServletRequest Wrapper Filter</filter-name>
		<filter-class>org.jasig.cas.client.util.HttpServletRequestWrapperFilter</filter-class>
	</filter>

	<filter>
		<filter-name>CAS Assertion Thread Local Filter</filter-name>
		<filter-class>org.jasig.cas.client.util.AssertionThreadLocalFilter</filter-class>
	</filter>
	
	<filter-mapping>
		<filter-name>SsoSession</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>

	<filter-mapping>
		<filter-name>CAS Authentication Filter</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>


	
	<filter-mapping>
		<filter-name>CAS Validation Filter</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>
	
	<filter-mapping>
	    <filter-name>CAS Assertion Thread Local Filter</filter-name>
	    <url-pattern>/*</url-pattern>
	</filter-mapping>

	<welcome-file-list>
		<welcome-file>index.html</welcome-file>
		<welcome-file>index.htm</welcome-file>
		<welcome-file>index.jsp</welcome-file>
		<welcome-file>default.html</welcome-file>
		<welcome-file>default.htm</welcome-file>
		<welcome-file>default.jsp</welcome-file>
	</welcome-file-list>
</web-app>