有几种办法:
1.扩展指定server
利用Servlet容器提供的插件功能,自定义HttpSession的创建和管理策略,并通过配置的方式替换掉默认的策略。缺点:耦合Tomcat/Jetty等Servlet容器,不能随意更换容器。
2.利用Filter
利用HttpServletRequestWrapper,实现自己的 getSession()方法,接管创建和管理Session数据的工作。spring-session就是通过这样的思路实现的。
3 利用spring session
Spring Boot中spring session支持方式:
JDBC、MongoDB、Redis、Hazelcast、HashMap
一、引入maven依赖
<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>
二、配置application.properties
server.port=8080
spring.redis.host=localhost
spring.redis.port=6379
# 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.shyroke;
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 SpringbootSessionApplication {
public static void main(String[] args) {
SpringApplication.run(SpringbootSessionApplication.class, args);
}
}
四、编写控制器
package com.shyroke.controller;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.http.HttpRequest;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
@Controller
@RequestMapping(value = "/")
public class IndexController {
@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:8080/session,在session中设置一个值
- 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。
源码面前,了无秘密