自己动手写SSO（单点登录）

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 &amp;&amp; null != ticket) {
        filterChain.doFilter(servletRequest, servletResponse);
        return;
    }

    if (null != username &amp;&amp; !"".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 &lt;= service.indexOf("?")) {
            url.append("&amp;");
        } 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) &amp;&amp; "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 &lt;= service.indexOf("?")) {
                url.append("&amp;");
            } 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&lt;String, String&gt; TICKET_AND_NAME = new HashMap&lt;String, String&gt;();

}

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>
&lt;filter&gt;
    &lt;filter-name&gt;ssoServerFilter&lt;/filter-name&gt;
    &lt;filter-class&gt;com.cloud.sso.server.filter.SSOServerFilter&lt;/filter-class&gt;
&lt;/filter&gt;
&lt;filter-mapping&gt;
    &lt;filter-name&gt;ssoServerFilter&lt;/filter-name&gt;
    &lt;url-pattern&gt;/*&lt;/url-pattern&gt;
&lt;/filter-mapping&gt;

&lt;servlet&gt;
    &lt;servlet-name&gt;login&lt;/servlet-name&gt;
    &lt;servlet-class&gt;com.cloud.sso.server.servlet.LoginServlet&lt;/servlet-class&gt;
&lt;/servlet&gt;
&lt;servlet-mapping&gt;
    &lt;servlet-name&gt;login&lt;/servlet-name&gt;
    &lt;url-pattern&gt;/user/login&lt;/url-pattern&gt;
&lt;/servlet-mapping&gt;

&lt;servlet&gt;
    &lt;servlet-name&gt;ticket&lt;/servlet-name&gt;
    &lt;servlet-class&gt;com.cloud.sso.server.servlet.TicketServlet&lt;/servlet-class&gt;
&lt;/servlet&gt;
&lt;servlet-mapping&gt;
    &lt;servlet-name&gt;ticket&lt;/servlet-name&gt;
    &lt;url-pattern&gt;/ticket&lt;/url-pattern&gt;
&lt;/servlet-mapping&gt;

</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 &amp;&amp; !"".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 &amp;&amp; !"".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>
&lt;filter&gt;
    &lt;filter-name&gt;ssoClientFilter&lt;/filter-name&gt;
    &lt;filter-class&gt;com.cloud.sso.oa.filter.SSOClientFilter&lt;/filter-class&gt;
&lt;/filter&gt;
&lt;filter-mapping&gt;
    &lt;filter-name&gt;ssoClientFilter&lt;/filter-name&gt;
    &lt;url-pattern&gt;/*&lt;/url-pattern&gt;
&lt;/filter-mapping&gt;

&lt;servlet&gt;
    &lt;servlet-name&gt;list&lt;/servlet-name&gt;
    &lt;servlet-class&gt;com.cloud.sso.oa.servlet.OAServlet&lt;/servlet-class&gt;
&lt;/servlet&gt;
&lt;servlet-mapping&gt;
    &lt;servlet-name&gt;list&lt;/servlet-name&gt;
    &lt;url-pattern&gt;/list&lt;/url-pattern&gt;
&lt;/servlet-mapping&gt;

</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 &amp;&amp; !"".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 &amp;&amp; !"".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>
&lt;filter&gt;
    &lt;filter-name&gt;ssoClientFilter&lt;/filter-name&gt;
    &lt;filter-class&gt;com.cloud.sso.pro.filter.SSOClientFilter&lt;/filter-class&gt;
&lt;/filter&gt;
&lt;filter-mapping&gt;
    &lt;filter-name&gt;ssoClientFilter&lt;/filter-name&gt;
    &lt;url-pattern&gt;/*&lt;/url-pattern&gt;
&lt;/filter-mapping&gt;

&lt;servlet&gt;
    &lt;servlet-name&gt;list&lt;/servlet-name&gt;
    &lt;servlet-class&gt;com.cloud.sso.pro.servlet.ProServlet&lt;/servlet-class&gt;
&lt;/servlet&gt;
&lt;servlet-mapping&gt;
    &lt;servlet-name&gt;list&lt;/servlet-name&gt;
    &lt;url-pattern&gt;/list&lt;/url-pattern&gt;
&lt;/servlet-mapping&gt;

</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：

工程源代码供下载：

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