Spring Session - 使用Redis存储HttpSession例子

2022-09-12 08:52:48

目的

使用Redis存储管理HttpSession；

添加pom.xml

该工程基于Spring Boot，同时我们将使用Spring IO Platform来维护依赖版本号；

引入的依赖有spring-session、spring-boot-starter-web、spring-boot-starter-redis，pom文件如下：

<?xml version="1.0" encoding="UTF-8"?>

<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/xsd/maven-4.0.0.xsd">

    <modelVersion>4.0.0</modelVersion>

    <groupId>com.example</groupId>

    <artifactId>helloworld</artifactId>

    <version>0.0.1-SNAPSHOT</version>

    <dependencyManagement>

        <dependencies>

            <dependency>

                <groupId>io.spring.platform</groupId>

                <artifactId>platform-bom</artifactId>

                <version>Athens-SR2</version>

                <type>pom</type>

                <scope>import</scope>

            </dependency>

            <dependency>

                <!-- Import dependency management from Spring Boot -->

                <groupId>org.springframework.boot</groupId>

                <artifactId>spring-boot-dependencies</artifactId>

                <version>1.4.3.RELEASE</version>

                <type>pom</type>

                <scope>import</scope>

            </dependency>

        </dependencies>

    </dependencyManagement>

    <!-- Additional lines to be added here... -->

    <dependencies>

        <dependency>

            <groupId>org.springframework.session</groupId>

            <artifactId>spring-session</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-web</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-redis</artifactId>

        </dependency>

    </dependencies>

    <build>

        <plugins>

            <plugin>

                <groupId>org.springframework.boot</groupId>

                <artifactId>spring-boot-maven-plugin</artifactId>

                <version>1.4.3.RELEASE</version>

                <executions>

                    <execution>

                        <goals>

                            <goal>repackage</goal>

                        </goals>

                    </execution>

                </executions>

            </plugin>

        </plugins>

    </build>

</project>

配置Spring Session

配置比较简单，主要是添加@EnableRedisHttpSession注解即可，该注解会创建一个名字叫springSessionRepositoryFilter的Spring Bean，其实就是一个Filter，这个Filter负责用Spring Session来替换原先的默认HttpSession实现，在这个例子中，Spring Session是用Redis来实现的。

import org.springframework.session.data.redis.config.annotation.web.http.EnableRedisHttpSession;

@EnableRedisHttpSession

public class HttpSessionConfig {

}

操作HttpSession

这里我们将实现两个操作，一个是往Session中写入数据，另一个是查询数据，如下所示：

@RestController

public class Example {

    @RequestMapping("/set")

    String set(HttpServletRequest req) {

        req.getSession().setAttribute("testKey", "testValue");

        return "设置session:testKey=testValue";

    }

    @RequestMapping("/query")

    String query(HttpServletRequest req) {

        Object value = req.getSession().getAttribute("testKey");

        return "查询Session：\"testKey\"=" + value;

    }

}

编写main方法

编写main方法，使用@SpringBootApplication注解标注，如果查看该注解源码的话，会发现相当于添加了@SpringBootConfiguration@EnableAutoConfiguration@ComponentScan等注解

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication

public class APP {

       public static void main(String[] args) throws Exception {

            SpringApplication.run(APP.class, args);

        }

}