使用filter + cookie实现单点登录

1 <?xml version=\'1.0\' encoding=\'utf-8\'?> 2 <!-- 3 Licensed to the Apache Software Foundation (ASF) under one or more 4 contributor license agreements. See the NOTICE file distributed with 5 this work for additional information regarding copyright ownership. 6 The ASF licenses this file to You under the Apache License, Version 2.0 7 (the "License"); you may not use this file except in compliance with 8 the License. You may obtain a copy of the License at 9 10 http://www.apache.org/licenses/LICENSE-2.0 11 12 Unless required by applicable law or agreed to in writing, software 13 distributed under the License is distributed on an "AS IS" BASIS, 14 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 See the License for the specific language governing permissions and 16 limitations under the License. 17 --> 18 <!-- Note: A "Server" is not itself a "Container", so you may not 19 define subcomponents such as "Valves" at this level. 20 Documentation at /docs/config/server.html 21 --> 22 <Server port="8005" shutdown="SHUTDOWN"> 23 <!-- Security listener. Documentation at /docs/config/listeners.html 24 <Listener className="org.apache.catalina.security.SecurityListener" /> 25 --> 26 <!--APR library loader. Documentation at /docs/apr.html --> 27 <Listener className="org.apache.catalina.core.AprLifecycleListener" SSLEngine="on" /> 28 <!--Initialize Jasper prior to webapps are loaded. Documentation at /docs/jasper-howto.html --> 29 <Listener className="org.apache.catalina.core.JasperListener" /> 30 <!-- Prevent memory leaks due to use of particular java/javax APIs--> 31 <Listener className="org.apache.catalina.core.JreMemoryLeakPreventionListener" /> 32 <Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener" /> 33 <Listener className="org.apache.catalina.core.ThreadLocalLeakPreventionListener" /> 34 35 <!-- Global JNDI resources 36 Documentation at /docs/jndi-resources-howto.html 37 --> 38 <GlobalNamingResources> 39 <!-- Editable user database that can also be used by 40 UserDatabaseRealm to authenticate users 41 --> 42 <Resource name="UserDatabase" auth="Container" 43 type="org.apache.catalina.UserDatabase" 44 description="User database that can be updated and saved" 45 factory="org.apache.catalina.users.MemoryUserDatabaseFactory" 46 pathname="conf/tomcat-users.xml" /> 47 </GlobalNamingResources> 48 49 <!-- A "Service" is a collection of one or more "Connectors" that share 50 a single "Container" Note: A "Service" is not itself a "Container", 51 so you may not define subcomponents such as "Valves" at this level. 52 Documentation at /docs/config/service.html 53 --> 54 <Service name="Catalina"> 55 56 <!--The connectors can use a shared executor, you can define one or more named thread pools--> 57 <!-- 58 <Executor name="tomcatThreadPool" namePrefix="catalina-exec-" 59 maxThreads="150" minSpareThreads="4"/> 60 --> 61 62 63 <!-- A "Connector" represents an endpoint by which requests are received 64 and responses are returned. Documentation at : 65 Java HTTP Connector: /docs/config/http.html (blocking & non-blocking) 66 Java AJP Connector: /docs/config/ajp.html 67 APR (HTTP/AJP) Connector: /docs/apr.html 68 Define a non-SSL HTTP/1.1 Connector on port 8080 69 --> 70 <Connector port="8080" protocol="HTTP/1.1" 71 connectionTimeout="20000" 72 redirectPort="8443" /> 73 <!-- A "Connector" using the shared thread pool--> 74 <!-- 75 <Connector executor="tomcatThreadPool" 76 port="8080" protocol="HTTP/1.1" 77 connectionTimeout="20000" 78 redirectPort="8443" /> 79 --> 80 <!-- Define a SSL HTTP/1.1 Connector on port 8443 81 This connector uses the JSSE configuration, when using APR, the 82 connector should be using the OpenSSL style configuration 83 described in the APR documentation --> 84 <!-- 85 <Connector port="8443" protocol="HTTP/1.1" SSLEnabled="true" 86 maxThreads="150" scheme="https" secure="true" 87 clientAuth="false" sslProtocol="TLS" /> 88 --> 89 90 <!-- Define an AJP 1.3 Connector on port 8009 --> 91 <Connector port="8009" protocol="AJP/1.3" redirectPort="8443" /> 92 93 94 <!-- An Engine represents the entry point (within Catalina) that processes 95 every request. The Engine implementation for Tomcat stand alone 96 analyzes the HTTP headers included with the request, and passes them 97 on to the appropriate Host (virtual host). 98 Documentation at /docs/config/engine.html --> 99 100 <!-- You should set jvmRoute to support load-balancing via AJP ie : 101 <Engine name="Catalina" defaultHost="localhost" jvmRoute="jvm1"> 102 --> 103 <Engine name="Catalina" defaultHost="localhost"> 104 105 <!--For clustering, please take a look at documentation at: 106 /docs/cluster-howto.html (simple how to) 107 /docs/config/cluster.html (reference documentation) --> 108 <!-- 109 <Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"/> 110 --> 111 112 <!-- Use the LockOutRealm to prevent attempts to guess user passwords 113 via a brute-force attack --> 114 <Realm className="org.apache.catalina.realm.LockOutRealm"> 115 <!-- This Realm uses the UserDatabase configured in the global JNDI 116 resources under the key "UserDatabase". Any edits 117 that are performed against this UserDatabase are immediately 118 available for use by the Realm. --> 119 <Realm className="org.apache.catalina.realm.UserDatabaseRealm" 120 resourceName="UserDatabase"/> 121 </Realm> 122 123 <Host name="localhost" appBase="webapps" 124 unpackWARs="true" autoDeploy="true"> 125 126 127 128 <!-- SingleSignOn valve, share authentication between web applications 129 Documentation at: /docs/config/valve.html --> 130 <!-- 131 <Valve className="org.apache.catalina.authenticator.SingleSignOn" /> 132 --> 133 134 <!-- Access log processes all example. 135 Documentation at: /docs/config/valve.html 136 Note: The pattern used is equivalent to using pattern="common" --> 137 <Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs" 138 prefix="localhost_access_log." suffix=".txt" 139 pattern="%h %l %u %t &quot;%r&quot; %s %b" /> 140 141 </Host> 142 143 144 145 <Host name="www.bbs.kite.com" appBase="bbs"> 146 </Host> 147 148 <Host name="www.news.kite.com" appBase="news"> 149 </Host> 150 </Engine> 151 </Service> 152 </Server>

1 package kite.filter; 2 3 import java.io.IOException; 4 5 import javax.servlet.Filter; 6 import javax.servlet.FilterChain; 7 import javax.servlet.FilterConfig; 8 import javax.servlet.ServletException; 9 import javax.servlet.ServletRequest; 10 import javax.servlet.ServletResponse; 11 import javax.servlet.http.Cookie; 12 import javax.servlet.http.HttpServletRequest; 13 14 public class LoginFilter implements Filter 15 { 16 17 @Override 18 public void destroy() 19 { 20 // TODO Auto-generated method stub 21 22 } 23 24 @Override 25 public void doFilter(ServletRequest req, ServletResponse resp, 26 FilterChain chain) throws IOException, ServletException 27 { 28 29 HttpServletRequest request = (HttpServletRequest) req; 30 //在request中获得session 判断是否存在user对应的value 如果不存在从 cookie中获得 31 if(request.getSession().getAttribute("user") == null) 32 { 33 Cookie[] cs = request.getCookies(); 34 if(cs != null && cs.length > 0) 35 { 36 for(Cookie c : cs) 37 { 38 if("sso".equals(c.getName())) 39 { 40 request.getSession().setAttribute("user", c.getValue()); 41 } 42 } 43 } 44 45 } 46 chain.doFilter(request, resp); 47 } 48 49 @Override 50 public void init(FilterConfig arg0) throws ServletException 51 { 52 // TODO Auto-generated method stub 53 54 } 55 56 }