最近在看一些关于spring session 的知识，特做一个笔记记录一下。
在项目中经常会遇到这么一种情况，同一个web项目有时需要部署多份，然后使用nginx实现负载均衡，那么遇到的问题就是，部署多份之后，如何实现一个session的共享功能。此时就可以使用spring session来实现。
参考网址：http://docs.spring.io/spring-session/docs/current/reference/html5/guides/httpsession-jdbc-xml.html
1.引入spring session 的jar包依赖。
<?xml version="1.0"?> <project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>com.huan.spring</groupId> <artifactId>spring-session-parent</artifactId> <version>0.0.1-SNAPSHOT</version> </parent> <artifactId>02_spring_session_jdbc</artifactId> <packaging>war</packaging> <name>02_spring_session_jdbc Maven Webapp</name> <url>http://maven.apache.org</url> <dependencies> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> </dependency> <dependency> <groupId>org.springframework.session</groupId> <artifactId>spring-session-jdbc</artifactId> <type>pom</type> </dependency> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> </dependency> <dependency> <groupId>com.oracle</groupId> <artifactId>ojdbc14</artifactId> </dependency> </dependencies> <build> <finalName>02_spring_session_jdbc</finalName> </build> </project>
spring 的版本:4.1.5.RELEASE spring session-jdbc的版本:1.2.0.RELEASE
二、配置spring session的配置文件
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd"> <context:annotation-config /> <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close"> <!-- 基本属性driverClassName、 url、user、password --> <property name="driverClassName" value="oracle.jdbc.OracleDriver" /> <property name="url" value="jdbc:oracle:thin:@localhost:1521:orcl" /> <property name="username" value="scott" /> <property name="password" value="tiger" /> </bean> <bean class="org.springframework.session.jdbc.config.annotation.web.http.JdbcHttpSessionConfiguration" /> <bean class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <constructor-arg ref="dataSource" /> </bean> </beans>
三、配置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" 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"> <context-param> <param-name>contextConfigLocation</param-name> <param-value> classpath:spring-session.xml </param-value> </context-param> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <filter> <filter-name>springSessionRepositoryFilter</filter-name> <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class> </filter> <filter-mapping> <filter-name>springSessionRepositoryFilter</filter-name> <url-pattern>/*</url-pattern> <dispatcher>REQUEST</dispatcher> <dispatcher>ERROR</dispatcher> </filter-mapping> </web-app>
四、编写测试代码
1.登录界面(login.jsp)
<body> <form action="LoginServlet" method="post"> <table> <tbody> <tr> <td>用户名:</td> <td><input name="loginName" required="required" /></td> </tr> <tr> <td>密码:</td> <td><input type="password" name="password" required="required"></td> </tr> </tbody> <tfoot> <tr> <td colspan="2"><input type="submit" value="登录"></td> </tr> </tfoot> </table> </form> </body>
2.后台的逻辑处理
@WebServlet("/LoginServlet")
public class LoginServlet extends HttpServlet {
private static final long serialVersionUID = -8455306719565291102L;
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doPost(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
HttpServletRequest request = (HttpServletRequest) req;
HttpServletResponse response = (HttpServletResponse) resp;
request.setCharacterEncoding("UTF-8");
String loginName = request.getParameter("loginName");
String password = request.getParameter("password");
request.getSession().setAttribute("login", true);
request.getSession().setAttribute(loginName, password);
response.sendRedirect(request.getContextPath() + "/show.jsp");
}
}
3.展示界面(show.jsp ---> 没有登录访问次界面，直接跳到登录界面)
<body>
输出session中的值:
<%
if (request.getSession().getAttribute("login") == null) {
response.sendRedirect(request.getContextPath() + "/login.jsp");
}
%>
<%
Enumeration<String> enumeration = request.getSession().getAttributeNames();
while (enumeration.hasMoreElements()) {
String key = enumeration.nextElement();
Object value = request.getSession().getAttribute(key);
out.println(key + " --- " + value);
}
%>
<br>
-----------------
jsessionId:<%=request.getSession().getId() %>
----------------------
<%=request.getRemoteAddr()%>
<%=request.getRemotePort()%>
<%=request.getRemoteHost()%>
<%=request.getRemoteUser()%>
<%=request.getHeader("X-Real-IP")%>
<%=request.getHeader("Host")%>
<%=request.getHeader("X-Forwarded-For")%>
<%=request.getLocalPort()%>
</body>
4.nginx的简单配置 --- 启动ngnix
5.分别启动2个tomcat容器
6.修改其中一个tomcat容器中的show.jsp的值，随便加一个内容，以示区分。
7.页面上访问
8.可以到oracle数据区中进行查询，用到的表
select * from SPRING_SESSION t; select * from SPRING_SESSION_ATTRIBUTES t;
9.用到的sql语句所在的jar包目录
