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redis保存session信息的示例代码

2023-01-16 15:00

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本文实现一个将session信息保存在 redis中，多个tomcat中的工程都从redis获取session信息的示例。

1、新建一个maven web 工程名为 session-redis 如下：

目录结构如下：

2、修改配置文件内容

pom.xml 中依赖如下：

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.7</maven.compiler.source>
    <maven.compiler.target>1.7</maven.compiler.target>
     <spring.version>5.0.4.RELEASE</spring.version>
  </properties>
  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
      <scope>test</scope>
    </dependency>
      <!--spring 依赖包-->
      <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-context</artifactId>
          <version>${spring.version}</version>
      </dependency>
      <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-core</artifactId>
          <version>${spring.version}</version>
      </dependency>
      <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-webmvc</artifactId>
          <version>${spring.version}</version>
      </dependency>
      <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-beans</artifactId>
          <version>${spring.version}</version>
      </dependency>
      <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-context-support</artifactId>
          <version>${spring.version}</version>
      </dependency>
      <!--spring 依赖包  结束-->
      <!-- Spring 升级4+ 依赖的JSON包 -->
      <dependency>
          <groupId>com.fasterxml.jackson.core</groupId>
          <artifactId>jackson-databind</artifactId>
          <version>2.9.5</version>
      </dependency>
      <dependency>
          <groupId>commons-collections</groupId>
          <artifactId>commons-collections</artifactId>
          <version>3.2.2</version>
      </dependency>
      <!-- /Spring 升级4+ 依赖的JSON包 -->
      <!--sfl4j+spring-->
      <dependency>
          <groupId>ch.qos.logback</groupId>
          <artifactId>logback-classic</artifactId>
          <version>1.2.3</version>
      </dependency>
      <dependency>
          <groupId>org.logback-extensions</groupId>
          <artifactId>logback-ext-spring</artifactId>
          <version>0.1.5</version>
      </dependency>
      <dependency>
          <groupId>org.slf4j</groupId>
          <artifactId>jcl-over-slf4j</artifactId>
          <version>1.7.25</version>
      </dependency>
      <!--sfl4j+spring-->
      <!--jedis依赖-->
      <dependency>
          <groupId>redis.clients</groupId>
          <artifactId>jedis</artifactId>
          <version>2.9.0</version>
      </dependency>
      <!--web包依赖-->
      <dependency>
          <groupId>javax.servlet</groupId>
          <artifactId>servlet-api</artifactId>
          <version>2.5</version>
          <scope>compile</scope>
      </dependency>
      <dependency>
          <groupId>javax.servlet.jsp</groupId>
          <artifactId>jsp-api</artifactId>
          <version>2.2</version>
      </dependency>
      <!--spirng实现redissession存储依赖包-->
      <dependency>
          <groupId>org.springframework.session</groupId>
          <artifactId>spring-session-data-redis</artifactId>
          <version>2.0.4.RELEASE</version>
      </dependency>
  </dependencies>

web.xml 配置文件内容

<web-app>
  <display-name>Archetype Created Web Application</display-name>
  <!--配置spring session 过滤器   session数据的保存应该是通过过滤器来起作用，具体如何起作用日后研究-->
  <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>
  </filter-mapping>
  <!-- 配置springmvc -->
  <servlet>
    <servlet-name>springMvc</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath*:mvc-demo.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>springMvc</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>
</web-app>

mvc-demo.xml 增加配置内容、

  <!--spring注解配置-->
  <mvc:annotation-driven/>
    <context:component-scan base-package="com.test.session"/>
    <!--redis保存session信息配置类-->
    <bean id="redisHttpSessionConfiguration"
          class="org.springframework.session.data.redis.config.annotation.web.http.RedisHttpSessionConfiguration">
        <property name="maxInactiveIntervalInSeconds" value="60"/><!--session 信息过期时间-->

    </bean>
    <!--redis 链接信息配置-->
    <bean id="standlongConfig" class="org.springframework.data.redis.connection.RedisStandaloneConfiguration">
        <property name="port" value="6379"/>
        <property name="hostName" value="127.0.0.1"/>
        <property name="database" value="0"/>
    </bean>
      <!--jedis 连接工厂配置-->
    <bean id="jedisConnectionFactory" class="
    org.springframework.data.redis.connection.jedis.JedisConnectionFactory">
        <constructor-arg name="standaloneConfig" ref="standlongConfig"/>
    </bean>

3、增加IndexController类，里边两个方法
index 方法返回字符串 index ，并且在session中添加属性 name 为 zhangsan ，打印sessionid
getName 方法返回session中的name属性 .打印sessionid
如下：

@RestController
public class IndexController {

    @GetMapping ("/index")
    public String index(HttpServletRequest request){
        request.getSession().setAttribute("name","zhagnsan");
        System.out.println("-----index------------sessionid"+request.getSession().getId());
        return "index";
    }

    @GetMapping ("/getName")
    public String getName(HttpServletRequest request){
        System.out.println("----getName-------------sessionid======"+request.getSession().getId());

        return  (String)request.getSession().getAttribute("name");
    }
}

4、在本机启动redis服务

在这里插入图片描述