Spring Session -redis

SpringBoot之使用Spring Session集群-redis

用nginx做负载的时候，会出现每一次http请求都会分配到不同的tomcat上，这样用session存储用户数据就会有问题。因为tomcat集群之间没有实现session共享。

spring-session跟redis很好的帮我们解决了这个问题。

一、引入maven依赖

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

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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

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    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

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    <modelVersion>4.0.0</modelVersion>

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    <groupId>com.cicoding.druid</groupId>

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    <artifactId>springboot_session_redis_colony</artifactId>

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    <version>0.0.1-SNAPSHOT</version>

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    <packaging>war</packaging>

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    <name>springboot_session_redis_colony</name>

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    <description>Demo project for Spring Boot</description>

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    <parent>

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

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

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        <version>1.5.9.RELEASE</version>

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        <relativePath /> <!-- lookup parent from repository -->

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    </parent>

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    <properties>

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        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

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        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>

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        <java.version>1.8</java.version>

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    </properties>

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    <dependencies>

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        <dependency>

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

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

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        </dependency>

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        <dependency>

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

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            <artifactId>spring-session-data-redis</artifactId>

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        </dependency>

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        <dependency>

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

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

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        </dependency>

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    </dependencies>

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    <build>

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        <plugins>

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            <plugin>

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

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

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            </plugin>

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        </plugins>

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    </build>

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</project>

二、配置application.properties

server.port=8082
spring.redis.host=localhost
spring.redis.port=6379
spring.redis.password=redis password

# spring session使用存储类型
spring.session.store-type=redis

spirngboot默认就是使用redis方式，如果不想用可以填none。

三、在启动类中加入@EnableRedisHttpSession 注解

package com.cicoding;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.session.data.redis.config.annotation.web.http.EnableRedisHttpSession;

@EnableCaching
@EnableRedisHttpSession  
@SpringBootApplication
public class SessionApplication {

	public static void main(String[] args) {
		SpringApplication.run(SessionApplication.class, args);
	}
}

四、编写控制器

package com.cicoding.controller;

import java.util.HashMap;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
@Controller
@RequestMapping(value = "/")
public class UserController {

	@ResponseBody
    @RequestMapping(value = "/session")
    public Map<String, Object> getSession(HttpServletRequest request) {
        request.getSession().setAttribute("username", "admin");
        Map<String, Object> map = new HashMap<String, Object>();
        map.put("sessionId", request.getSession().getId());
        return map;
    }

    @ResponseBody
    @RequestMapping(value = "/get")
    public String get(HttpServletRequest request) {
        String userName = (String) request.getSession().getAttribute("username");

        return userName;
    }

}

五、测试