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
<?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.cicoding.druid</groupId>
<artifactId>springboot_session_redis_colony</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<name>springboot_session_redis_colony</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.9.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.session</groupId>
<artifactId>spring-session-data-redis</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</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
- 先输入http://localhost:8082/session,在session中设置一个值
- http://localhost:8082/get,获取session中的值
- 复制这个工程,application.properties中的server.port=8081,然后访问“http://localhost:8081/get”,如下获取到了另一个工程中设置的session的值。
这样两个应用就能拿到同一个session集群共享了session
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