springboot+redis实现session共享

最新推荐文章于 2025-04-20 08:30:11 发布

天明少侠

最新推荐文章于 2025-04-20 08:30:11 发布

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分类专栏： spring boot 文章标签： Spring Boot 入口类

本文链接：https://blog.youkuaiyun.com/thebigdipperbdx/article/details/81558674

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配置多数据源

com.sto.stock.datasource.DataSourceConfig

@Primary注解只能加在一个数据源上

常用注解

@ConfigurationProperties

@ConfigurationProperties(“spring.datasource.druid.one”)
@ConfigurationProperties(prefix=“spring.rabbitmq”)

解决myBatis下不能嵌套jar文件的问题

VFS.addImplClass(SpringBootVFS.class);

log4j.properties

log4j.appender.file.File=/app/server/logs/sto-service-stock/log.log

入口类运用CountDownLatch

@SpringBootApplication
@DubboComponentScan(basePackages = "com.sto.stock.service.impl")
public class StockApplication {
	
	private static CountDownLatch latch = new CountDownLatch(1);
	
	public static void main(String[] args) {
		SpringApplication.run(StockApplication.class, args);
		try {
			latch.await();
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
	}
}

CountDownLatch设置等待线程数为1，且主方法没有调用countDown()，故使得主线程永远阻塞

原因解释

因为POM文件中没有加spring-boot-starter-web，运行入口类，程序出错【没有提供Tomcat容器】，主线程退出，就无法提供dubbo服务，所以要加CountDownLatch，阻塞主线程。

而，spring-boot-starter-web内嵌Tomcat容器，主线程可以正常跑【Spring Boot支持容器的自动配置，默认是Tomcat】

采取措施

运用CountDownLatch使得主线程永远阻塞
POM文件中添加spring-boot-starter-web【支持全栈式Web开发，包括Tomcat和spring-webmvc。】

oracle hint

存储在数据库中数据的分布情况开发人员或管理员比Oracle优化器更加的清楚，在优化器不能作出最有查询路径选择的情况下，使用HINT（提示）人为的固定查询路径，一定程度能生成更优的执行计划。

用到别名时，/+INDEX(TABLE INDEX_NAME)/中的TABLE一定是别名，否则不走执行强制索引。

select /*+INDEX(t IDX_SEL_ADD_DATE)*/ t.own_sys, count(1)  
 from std_entp_login t  
where t.add_date >  
              to_date('2010-12-28 00:00:00', 'yyyy-mm-dd hh24:mi:ss')  
          and t.add_date <  
              to_date('2010-12-28 23:59:59', 'yyyy-mm-dd hh24:mi:ss')  
group by t.own_sys

模糊查询

where cusname like '%' || #{cusname} || '%' or cuscode like '%' || #{cusname} || '%'

共享session

package com.fuzzy.search;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.support.SpringBootServletInitializer;
import org.springframework.context.annotation.Bean;
import org.springframework.session.data.redis.config.annotation.web.http.EnableRedisHttpSession;
import org.springframework.session.web.http.CookieHttpSessionStrategy;
import org.springframework.session.web.http.DefaultCookieSerializer;

@SpringBootApplication
@EnableRedisHttpSession(maxInactiveIntervalInSeconds = 21600, redisNamespace = "fuzzy-search-web")
public class FuzzySearchApplication extends SpringBootServletInitializer {

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

    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder builder){
        return builder.sources(FuzzySearchApplication.class);
    }

    @Bean
    public CookieHttpSessionStrategy cookieHttpSessionStrategy(){
        CookieHttpSessionStrategy strategy=new CookieHttpSessionStrategy();
        DefaultCookieSerializer cookieSerializer=new DefaultCookieSerializer();
        cookieSerializer.setCookieName("fuzzy-search-web");//cookies名称
        cookieSerializer.setCookieMaxAge(21600);//过期时间(秒)
        strategy.setCookieSerializer(cookieSerializer);
        return strategy;
    }


}

集群和分布式部署，需要考虑session共享@EnableRedisHttpSession，将HttpSession存储在Redis中

    @RequestMapping("/execute")
    public ModelAndView execute(HttpServletRequest request){
        HttpSession session=request.getSession();
        session.setAttribute("hello","world");

        ModelAndView view=new ModelAndView("fuzzysearch");
        DateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
        Date date=new Date();
        Calendar c=Calendar.getInstance();
        c.setTime(date);
        c.add(Calendar.DAY_OF_MONTH, -3); //当前天数-3
        view.addObject("start", sdf.format(c.getTime()));
        view.addObject("end", sdf.format(c.getTime()));
        view.addObject("timestamp", System.currentTimeMillis());

        helloBean.executeProcess("sayBean");

        System.out.println(session.getAttribute("hello"));
        return view;
    }