基于 Cokie 与 Filter 的单点登录系统

1. 项目结构

2. 主要说明

IndexServlet 处理项目运行首页，如果用户已登录则重定向到欢迎界面 index.jsp，用户未登录则重定向到 login.jsp进行登录

LoginServlet 处理登录请求，用户名 == 密码时登录成功，并新建Cookie:

        String username = req.getParameter("username");
        String password = req.getParameter("password");

        if (null != username && username.equals(password)) {
            HttpSession session = req.getSession();
            session.setAttribute("user", username);

            Cookie ck = new Cookie("sso", username);
            ck.setDomain("dtdream.com");
            ck.setPath("/");
            ck.setMaxAge(3600);
            resp.addCookie(ck);

            resp.sendRedirect("index");
        }

AutoLoginFilter 过滤所有请求，解析cookie，当cookie中携带有登录信息，则取出放进session中，实现用户自动登录

        HttpSession session = request.getSession();
        if (null == session || null == session.getAttribute("user")) {

            Cookie[] cookies = request.getCookies();
            if (null != cookies) {
                for (Cookie cookie : cookies) {
                    String cookieName = cookie.getName();
                    if ("sso".equals(cookieName)) {
                        session.setAttribute("user", cookie.getValue());
                    }
                }
            }
        }

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0"
         xmlns="http://java.sun.com/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
    http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">

  <filter>
    <filter-name>autoLoginFilter</filter-name>
    <filter-class>com.dtdream.dmall.servlet.AutoLoginFilter</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>autoLoginFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

  <servlet>
    <servlet-name>indexServlet</servlet-name>
    <servlet-class>com.dtdream.dmall.servlet.IndexServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>indexServlet</servlet-name>
    <url-pattern>/index</url-pattern>
  </servlet-mapping>

  <servlet>
    <servlet-name>loginServlet</servlet-name>
    <servlet-class>com.dtdream.dmall.servlet.LoginServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>loginServlet</servlet-name>
    <url-pattern>/login</url-pattern>
  </servlet-mapping>

</web-app>

3. 配置与测试：为实现cookie的共享子域必须相同

host文件修改：

127.0.0.1       bbs.dtdream.com
127.0.0.1       news.dtdream.com

tomcat server.xml配置修改，创建基于域名的虚拟主机：

      <Host name="bbs.dtdream.com"  appBase="bbs"
            unpackWARs="true" autoDeploy="true">
      </Host>
	  
	  <Host name="news.dtdream.com"  appBase="news"
            unpackWARs="true" autoDeploy="true">
      </Host>

http://bbs.dtdream.com:8080/index

http://news.dtdream.com:8080/index

基于 Cokie 与 Filter 的单点登录系统

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