SSO（单点登录）示例

此文为转载文章，出处：https://www.cnblogs.com/jpfss/p/9273680.html

SSO在我们的应用中非常常见，例如我们在OA系统登录了，我们就可以直接进入采购系统，不需要再登录了，这样使我们非常方便。现在网上也有很多实现方法，于是乎我也想写一个看看。我主要用到的是cookie的机制。在此，分享给大家， 同时提供源代码下载。

进入主题：

工程说明

SSO的实现一般是会有一个SSO Server，也会叫认证中心，同时也会有被认证的系统，如OA系统、采购系统等，他们就相当于SSO Server的client。

为了更形象体现SSO，我写的SSO是有三个工程：一个SSO Server端口为8081，一个OA系统端口为8082，一个采购系统端口为8083。如图：

流程介绍

在整个SSO流程当，有两个流程非常重要，第一个是用户没有登录系统到登录系统的过程；第二是用户在一个系统当中已经登录（例如在OA系统中登录了），但又想进入另一个系统（例如进入PRO系统）的过程，如果把这两个过程搞定了，那么SSO也就搞定了。我画了两幅图来说明这两个过程。

先看用户没有登录系统到登录系统的过程，如图：

1：用户通过URL访问OA系统。

2：在OA系统中的filter发现这个URL没有ticket（你暂且就把ticket看做是门票），此时就会跳转到SSO Server。

3：SSO Server中的filter发现该客户端中的cookie中没有相应信息，也即是一个没有登录的用户，那么会跳转到登录页面。

4：用户在登录页面填写相应信息，然后通过post方式提交到SSO Server中。

5：SSO Server会校验用户信息（我为了快，我的校验方式就是要用户名为：cloud，同时密码为：cloud），同时在cookie中放username。

6：将生成ticket和username放到JVMCache中，在实际项目应该放到Memcached中，它的用处等下分析。

7，8：就是在用户访问OA系统的URL基础上加上了一个ticket参数，这样跳转到OA系统。

（此时进入OA系统时，filter发现URL是带ticket的，则filter会根据带过来的ticket并通过HttpClient的形式去调用SSO Server中的TicektServlet，这样就会返回用户名，其实这个用户名就是从JVMCache拿到的，同时马上将这个ticket从JVMCache中移除，这样保证一个ticket只会用一次，然后把返回的用户名放到session中）

9：session中有了用户名，说明用户登录成功了，则会去本应该返问的servlet。

10，11：将OA系统返回的视图给用户。

第二过程，用户已经登录成功了，但要访问另一个系统，如图：

1：用户通过URL访问PRO系统。

2：在PRO系统中的filter发现这个URL没有ticket，此时就会跳转到SSO Server。此时，由于用户登录了，所以cookie中有相应的信息（例如用户名），此时SSO Server中的filter会生成一个ticket。

3：将生成的ticket和username放到JVMCache中。

4：就是在用户访问PRO系统的URL基础上加上了一个ticket参数，这样跳转到PRO系统。

（此时进入PRO系统时，filter发现URL是带ticket的，则filter会根据带过来的ticket并通过HttpClient的形式去调用SSO Server中的TicektServlet，这样就会返回用户名，其实这个用户名就是从JVMCache拿到的，同时马上将这个ticket从JVMCache中移除，这样保证一个ticket只会用一次，然后把返回的用户名放到session中）

5：session中有了用户名，说明用户登录成功了，则会去本应该返问的servlet。

5，7：将PRO系统返回的视图给用户。

关键代码

先看SSO Server工程中的代码：

pom.xml

（注意：端口为8081）

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">

  <modelVersion>4.0.0</modelVersion>

  <groupId>com.cloud.sso.server</groupId>

  <artifactId>sso-server</artifactId>

  <packaging>war</packaging>

  <version>0.0.1-SNAPSHOT</version>

  <name>sso-server Maven Webapp</name>

  <url>http://maven.apache.org</url>

  <dependencies>

      <dependency>

          <groupId>javax.servlet</groupId>

          <artifactId>servlet-api</artifactId>

          <version>2.5</version>

          <scope>provided</scope>

      </dependency>

  </dependencies>

  <build>

    <finalName>sso-server</finalName>

    <plugins>

      <plugin>

          <groupId>org.mortbay.jetty</groupId>

          <artifactId>jetty-maven-plugin</artifactId>

          <version>8.1.9.v20130131</version>

          <configuration>

              <stopKey>stop</stopKey>

              <stopPort>6000</stopPort>

              <webAppConfig>

                  <contextPath>/sso</contextPath>

              </webAppConfig>

              <scanIntervalSeconds>4</scanIntervalSeconds>

              <connectors>

                  <connector implementation="org.eclipse.jetty.server.nio.SelectChannelConnector">

                      <port>8081</port>

                      <maxIdleTime>60000</maxIdleTime>

                  </connector>

              </connectors>

          </configuration>

      </plugin>

    </plugins>

  </build>

</project>

SSO Server中的filter

SSOServerFilter.java

package com.cloud.sso.server.filter;

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.Cookie;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import com.cloud.sso.server.JVMCache;

public class SSOServerFilter implements Filter {

    @Override

    public void destroy() {

    }

    @Override

    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {

        HttpServletRequest request = (HttpServletRequest) servletRequest;

        HttpServletResponse response = (HttpServletResponse) servletResponse;

        String service = request.getParameter("service");

        String ticket = request.getParameter("ticket");

        Cookie[] cookies = request.getCookies();

        String username = "";

        if (null != cookies) {

            for (Cookie cookie : cookies) {

                if ("sso".equals(cookie.getName())) {

                    username = cookie.getValue();

                    break;

                }

            }

        }

        if (null == service && null != ticket) {

            filterChain.doFilter(servletRequest, servletResponse);

            return;

        }

        if (null != username && !"".equals(username)) {

            long time = System.currentTimeMillis();

            String timeString = username + time;

            JVMCache.TICKET_AND_NAME.put(timeString, username);

            StringBuilder url = new StringBuilder();

            url.append(service);

            if (0 <= service.indexOf("?")) {

                url.append("&");

            } else {

                url.append("?");

            }

            url.append("ticket=").append(timeString);

            response.sendRedirect(url.toString());

        } else {

            filterChain.doFilter(servletRequest, servletResponse);

        }

    }

    @Override

    public void init(FilterConfig arg0) throws ServletException {

    }

}

两个servlet:

LoginServlet.java

package com.cloud.sso.server.servlet;

import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.http.Cookie;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import com.cloud.sso.server.JVMCache;

public class LoginServlet extends HttpServlet {

    private static final long serialVersionUID = -3170191388656385924L;

    @Override

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        this.doPost(request, response);

    }

    @Override

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        String username = request.getParameter("username");

        String password = request.getParameter("password");

        String service = request.getParameter("service");

        if ("cloud".equals(username) && "cloud".equals(password)) {

            Cookie cookie = new Cookie("sso", username);

            cookie.setPath("/");

            response.addCookie(cookie);

            long time = System.currentTimeMillis();

            String timeString = username + time;

            JVMCache.TICKET_AND_NAME.put(timeString, username);

            if (null != service) {

                StringBuilder url = new StringBuilder();

                url.append(service);

                if (0 <= service.indexOf("?")) {

                    url.append("&");

                } else {

                    url.append("?");

                }

                url.append("ticket=").append(timeString);

                response.sendRedirect(url.toString());

            } else {

                response.sendRedirect("/sso/index.jsp");

            }

        } else {

            response.sendRedirect("/sso/index.jsp?service=" + service);

        }

    }

}

TicketServlet.java

package com.cloud.sso.server.servlet;

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import com.cloud.sso.server.JVMCache;

public class TicketServlet extends HttpServlet {

    private static final long serialVersionUID = 5964206637772848290L;

    @Override

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        super.doGet(request, response);

    }

    @Override

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        String ticket = request.getParameter("ticket");

        String username = JVMCache.TICKET_AND_NAME.get(ticket);

        JVMCache.TICKET_AND_NAME.remove(ticket);

        PrintWriter writer = response.getWriter();

        writer.write(username);

    }

}

JVMCache.java

package com.cloud.sso.server;

import java.util.HashMap;

import java.util.Map;

public class JVMCache {

    public static Map<String, String> TICKET_AND_NAME = new HashMap<String, String>();

}

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:jsp="http://java.sun.com/xml/ns/javaee/jsp" 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">

    <welcome-file-list>

        <welcome-file>index.jsp</welcome-file>

    </welcome-file-list>

    <filter>

        <filter-name>ssoServerFilter</filter-name>

        <filter-class>com.cloud.sso.server.filter.SSOServerFilter</filter-class>

    </filter>

    <filter-mapping>

        <filter-name>ssoServerFilter</filter-name>

        <url-pattern>/*</url-pattern>

    </filter-mapping>

    <servlet>

        <servlet-name>login</servlet-name>

        <servlet-class>com.cloud.sso.server.servlet.LoginServlet</servlet-class>

    </servlet>

    <servlet-mapping>

        <servlet-name>login</servlet-name>

        <url-pattern>/user/login</url-pattern>

    </servlet-mapping>

    <servlet>

        <servlet-name>ticket</servlet-name>

        <servlet-class>com.cloud.sso.server.servlet.TicketServlet</servlet-class>

    </servlet>

    <servlet-mapping>

        <servlet-name>ticket</servlet-name>

        <url-pattern>/ticket</url-pattern>

    </servlet-mapping>

</web-app>

下面是OA系统中的代码：

pom.xml

（注意：端口为8082）

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">

  <modelVersion>4.0.0</modelVersion>

  <groupId>com.cloud.sso.oa</groupId>

  <artifactId>sso-oa</artifactId>

  <packaging>war</packaging>

  <version>0.0.1-SNAPSHOT</version>

  <name>sso-oa Maven Webapp</name>

  <url>http://maven.apache.org</url>

  <dependencies>

      <dependency>

          <groupId>javax.servlet</groupId>

          <artifactId>servlet-api</artifactId>

          <version>2.5</version>

          <scope>provided</scope>

      </dependency>

      <dependency>

          <groupId>commons-httpclient</groupId>

          <artifactId>commons-httpclient</artifactId>

          <version>3.1</version>

      </dependency>

  </dependencies>

  <build>

    <finalName>sso-oa</finalName>

    <plugins>

      <plugin>

          <groupId>org.mortbay.jetty</groupId>

          <artifactId>jetty-maven-plugin</artifactId>

          <version>8.1.9.v20130131</version>

          <configuration>

              <stopKey>stop</stopKey>

              <stopPort>6000</stopPort>

              <webAppConfig>

                  <contextPath>/oa</contextPath>

              </webAppConfig>

              <scanIntervalSeconds>4</scanIntervalSeconds>

              <connectors>

                  <connector implementation="org.eclipse.jetty.server.nio.SelectChannelConnector">

                      <port>8082</port>

                      <maxIdleTime>60000</maxIdleTime>

                  </connector>

              </connectors>

          </configuration>

      </plugin>

    </plugins>

  </build>

</project>

OA系统中的filter：

SSOClientFilter.java

package com.cloud.sso.oa.filter;

import java.io.IOException;

import java.net.URLEncoder;

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;

import javax.servlet.http.HttpSession;

import org.apache.commons.httpclient.HttpClient;

import org.apache.commons.httpclient.methods.PostMethod;

public class SSOClientFilter implements Filter {

    @Override

    public void destroy() {

    }

    @Override

    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {

        HttpServletRequest request = (HttpServletRequest) servletRequest;

        HttpServletResponse response = (HttpServletResponse) servletResponse;

        HttpSession session = request.getSession();

        String username = (String) session.getAttribute("username");

        String ticket = request.getParameter("ticket");

        String url = URLEncoder.encode(request.getRequestURL().toString(), "UTF-8");

        if (null == username) {

            if (null != ticket && !"".equals(ticket)) {

                PostMethod postMethod = new PostMethod("http://localhost:8081/sso/ticket");

                postMethod.addParameter("ticket", ticket);

                HttpClient httpClient = new HttpClient();

                try {

                    httpClient.executeMethod(postMethod);

                    username = postMethod.getResponseBodyAsString();

                    postMethod.releaseConnection();

                } catch (Exception e) {

                    e.printStackTrace();

                }

                if (null != username && !"".equals(username)) {

                    session.setAttribute("username", username);

                    filterChain.doFilter(request, response);

                } else {

                    response.sendRedirect("http://localhost:8081/sso/index.jsp?service=" + url);

                }

            } else {

                response.sendRedirect("http://localhost:8081/sso/index.jsp?service=" + url);

            }

        } else {

            filterChain.doFilter(request, response);

        }

    }

    @Override

    public void init(FilterConfig arg0) throws ServletException {

    }

}

OAServlet.java

package com.cloud.sso.oa.servlet;

import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class OAServlet extends HttpServlet {

    private static final long serialVersionUID = 3615122544373006252L;

    @Override

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        request.getRequestDispatcher("/WEB-INF/jsp/welcome.jsp").forward(request, response);

    }

    @Override

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        this.doGet(request, response);

    }

}

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:jsp="http://java.sun.com/xml/ns/javaee/jsp" 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">

    <welcome-file-list>

        <welcome-file>index.jsp</welcome-file>

    </welcome-file-list>

    <filter>

        <filter-name>ssoClientFilter</filter-name>

        <filter-class>com.cloud.sso.oa.filter.SSOClientFilter</filter-class>

    </filter>

    <filter-mapping>

        <filter-name>ssoClientFilter</filter-name>

        <url-pattern>/*</url-pattern>

    </filter-mapping>

    <servlet>

        <servlet-name>list</servlet-name>

        <servlet-class>com.cloud.sso.oa.servlet.OAServlet</servlet-class>

    </servlet>

    <servlet-mapping>

        <servlet-name>list</servlet-name>

        <url-pattern>/list</url-pattern>

    </servlet-mapping>

</web-app>

下面是PRO系统的代码：

pom.xml

（注意：端口为8083）

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">

  <modelVersion>4.0.0</modelVersion>

  <groupId>com.cloud.sso.pro</groupId>

  <artifactId>sso-pro</artifactId>

  <packaging>war</packaging>

  <version>0.0.1-SNAPSHOT</version>

  <name>sso-pro Maven Webapp</name>

  <url>http://maven.apache.org</url>

  <dependencies>

    <dependency>

          <groupId>javax.servlet</groupId>

          <artifactId>servlet-api</artifactId>

          <version>2.5</version>

          <scope>provided</scope>

      </dependency>

      <dependency>

          <groupId>commons-httpclient</groupId>

          <artifactId>commons-httpclient</artifactId>

          <version>3.1</version>

      </dependency>

  </dependencies>

  <build>

    <finalName>sso-pro</finalName>

    <plugins>

      <plugin>

          <groupId>org.mortbay.jetty</groupId>

          <artifactId>jetty-maven-plugin</artifactId>

          <version>8.1.9.v20130131</version>

          <configuration>

              <stopKey>stop</stopKey>

              <stopPort>6000</stopPort>

              <webAppConfig>

                  <contextPath>/pro</contextPath>

              </webAppConfig>

              <scanIntervalSeconds>4</scanIntervalSeconds>

              <connectors>

                  <connector implementation="org.eclipse.jetty.server.nio.SelectChannelConnector">

                      <port>8083</port>

                      <maxIdleTime>60000</maxIdleTime>

                  </connector>

              </connectors>

          </configuration>

      </plugin>

    </plugins>

  </build>

</project>

PRO系统中的filter

SSOClientFilter.java

package com.cloud.sso.pro.filter;

import java.io.IOException;

import java.net.URLEncoder;

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;

import javax.servlet.http.HttpSession;

import org.apache.commons.httpclient.HttpClient;

import org.apache.commons.httpclient.methods.PostMethod;

public class SSOClientFilter implements Filter {

    @Override

    public void destroy() {

    }

    @Override

    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {

        HttpServletRequest request = (HttpServletRequest) servletRequest;

        HttpServletResponse response = (HttpServletResponse) servletResponse;

        HttpSession session = request.getSession();

        String username = (String) session.getAttribute("username");

        String ticket = request.getParameter("ticket");

        String url = URLEncoder.encode(request.getRequestURL().toString(), "UTF-8");

        if (null == username) {

            if (null != ticket && !"".equals(ticket)) {

                PostMethod postMethod = new PostMethod("http://localhost:8081/sso/ticket");

                postMethod.addParameter("ticket", ticket);

                HttpClient httpClient = new HttpClient();

                try {

                    httpClient.executeMethod(postMethod);

                    username = postMethod.getResponseBodyAsString();

                    postMethod.releaseConnection();

                } catch (Exception e) {

                    e.printStackTrace();

                }

                if (null != username && !"".equals(username)) {

                    session.setAttribute("username", username);

                    filterChain.doFilter(request, response);

                } else {

                    response.sendRedirect("http://localhost:8081/sso/index.jsp?service=" + url);

                }

            } else {

                response.sendRedirect("http://localhost:8081/sso/index.jsp?service=" + url);

            }

        } else {

            filterChain.doFilter(request, response);

        }

    }

    @Override

    public void init(FilterConfig arg0) throws ServletException {

    }

}

ProServlet.java

package com.cloud.sso.pro.servlet;

import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class ProServlet extends HttpServlet {

    private static final long serialVersionUID = -1334093914490423930L;

    @Override

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        request.getRequestDispatcher("/WEB-INF/jsp/welcome.jsp").forward(request, response);

    }

    @Override

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        super.doPost(request, response);

    }

}

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:jsp="http://java.sun.com/xml/ns/javaee/jsp" 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">

    <welcome-file-list>

        <welcome-file>index.jsp</welcome-file>

    </welcome-file-list>

    <filter>

        <filter-name>ssoClientFilter</filter-name>

        <filter-class>com.cloud.sso.pro.filter.SSOClientFilter</filter-class>

    </filter>

    <filter-mapping>

        <filter-name>ssoClientFilter</filter-name>

        <url-pattern>/*</url-pattern>

    </filter-mapping>

    <servlet>

        <servlet-name>list</servlet-name>

        <servlet-class>com.cloud.sso.pro.servlet.ProServlet</servlet-class>

    </servlet>

    <servlet-mapping>

        <servlet-name>list</servlet-name>

        <url-pattern>/list</url-pattern>

    </servlet-mapping>

</web-app>

运行结果：

1：分别启动这三个工程。

2：访问OA系统，URL：http://localhost:8082/oa/list

3：这样到登录页面，如图：

4：用户名为：cloud，密码为：cloud，点击登录则会显示，如图：

5：然后去进入PRO系统，URL：http://localhost:8083/pro/list，则就不需要登录了，直接进入，如图：

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