Spring Session

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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;@EnableRedisHttpSessionpublic 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：

@RestControllerpublic 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;@SpringBootApplicationpublic class APP {       public static void main(String[] args) throws Exception {            SpringApplication.run(APP.class, args);        }}