1.什么事单点登录
单点登录其实就是实现这么一个功能。例如你登陆了www.bbs.kite.com这个网站，当你再登陆www.news.kite.com这个网站时，
就不需要再登陆了。以上两个网站一个很大的相似点，就是都有相同的域名.kite.com 。
二、单点登录的代码实现
1、新建一个webproject ，名为sso_bbs
2.新建一个servlet
1 package kite.servlet; 2 3 import java.io.IOException; 4 import java.io.PrintWriter; 5 6 import javax.servlet.ServletException; 7 import javax.servlet.http.Cookie; 8 import javax.servlet.http.HttpServlet; 9 import javax.servlet.http.HttpServletRequest; 10 import javax.servlet.http.HttpServletResponse; 11 12 public class LoginServlet extends HttpServlet 13 { 14 public void doGet(HttpServletRequest request, HttpServletResponse response) 15 throws ServletException, IOException 16 { 17 this.doPost(request, response); 18 } 19 20 public void doPost(HttpServletRequest request, HttpServletResponse response) 21 throws ServletException, IOException 22 { 23 String userName = request.getParameter("userName"); 24 String password = request.getParameter("password"); 25 26 if(userName != null && password != null) 27 { 28 if(userName.equals(password)) 29 { 30 request.getSession().setAttribute("user", userName); 31 32 Cookie cookie = new Cookie("sso", userName); 33 cookie.setMaxAge(60*60); 34 cookie.setDomain(".kite.com"); 35 cookie.setPath("/"); 36 response.addCookie(cookie); 37 } 38 } 39 response.sendRedirect(request.getContextPath() "/index.jsp"); 40 } 41 42 }
3.修改host文件
到C:WindowsSystem32driversetc目录下找到名为host文件，并在其中加上以下代码：
127.0.0.1 localhost 127.0.0.1 www.bbs.kite.com 127.0.0.1 www.news.kite.com
4.修改tomcat/config/server.xml文件
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 "%r" %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>
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