null); } public陶大客 void setStr(String key

摘要:在项目中,缓存以及mq消息队列可以说是不可或缺的2个重要技术。前者主要是为了减轻数据库压力,大幅度提升性能。



redis是如何存储对象和集合的

在项目中,缓存以及mq消息队列可以说是不可或缺的2个重要技术。前者主要是为了减轻数据库压力,大幅度提升性能。后者主要是为了提高用户的体验度,阿瑟隆在哪,我理解的是再后端做的一个ajax请求(异步),并且像ribbmitmq等消息队列有重试机制等功能。

这里主要讲redis如何把对象,集合存入,并且取出.

1.在启动类上加入如下代码

private Jedis jedis;private JedisPoolConfig config;private JedisShardInfo sharInfo;@Beanpublic Jedis jedis(){//连接redis服务器,192.168.0.100:6379// jedis = new Jedis("192.168.0.100", 6379);// //权限认证// jedis.auth("123456");// 操作单独的文本串config = new JedisPoolConfig(); config.setMaxIdle(1000);//最大空闲时间config.setMaxWaitMillis(1000); //最大等待时间config.setMaxTotal(500); //redis池中最大对象个数sharInfo = new JedisShardInfo("192.168.0.100", 6379); sharInfo.setPassword("123456"); sharInfo.setConnectionTimeout(5000);//链接超时时间jedis = new Jedis(sharInfo);return jedis; }

2.在Application.yml当中加入redis配置

spring: redis: database: 0 host: 101.132.191.77 port: 6379 password: 123456 pool: max-idle: 8 #连接池最大连接数(使用负值表示没有限制) min-idle: 0 # 连接池中的最小空闲连接 max-active: 8 # 连接池最大阻塞等待时间(使用负值表示没有限制) max-wait: -1 # 连接池中的最大空闲连接 timeout: 5000 # 连接超时时间(毫秒)

3..新建SerializeUtil类,这个类主要是为了将对象序列化redis当中

import JAVA.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.ObjectInputStream; import java.io.ObjectOutputStream;/** public class SerializeUtil { public static byte[] serialize(Object object) { ObjectOutputStream oos = null; ByteArrayOutputStream baos = null; try {// 序列化baos = new ByteArrayOutputStream(); oos = new ObjectOutputStream(baos); oos.writeObject(object); byte[] bytes = baos.toByteArray(); return bytes; } catch (Exception e) { }return null; } public static Object unserialize( byte[] bytes) { ByteArrayInputStream bais = null; try { // 反序列化bais = new ByteArrayInputStream(bytes); ObjectInputStream ois = new ObjectInputStream(bais); return ois.readObject(); } catch (Exception e) { }return null; } }

4.我封装了一个RedisServiceImpl类,主要是用对redis设值和取值

redisServiceImpl.set主要是传object,setStr主要设置string

import com.ys.util.redis.SerializeUtil; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.data.redis.core.StringRedisTemplate; import org.springframework.stereotype.Service; import redis.clients.jedis.Jedis; import java.util.List; import java.util.Map; import java.util.concurrent.TimeUnit; @Service public class RedisServiceImpl {@Autowired private StringRedisTemplate stringRedisTemplate; @Autowired private Jedis jedis; public void setStr(String key, String value) { setStr(key, value, null); } public void setStr(String key, Object value, Long time) {if(value == null){ return; }if(value instanceof String){ String obj = (String) value; stringRedisTemplate.opsForValue().set(key, obj); }else if(value instanceof List){ List obj = (List) value; stringRedisTemplate.opsForList().leftPushAll(key,obj); }else if(value instanceof Map){ Map obj = (Map) value; stringRedisTemplate.opsForHash().putAll(key,obj); }if (time != null) stringRedisTemplate.expire(key, time, TimeUnit.SECONDS); } public Object getKey(String key) {return stringRedisTemplate.opsForValue().get(key); } public void delKey(String key) { stringRedisTemplate.delete(key); } public boolean del(String key) {return jedis.del(key.getBytes())>0; } }

5.测试redis是否ok,编写redisController类

import com.ys.service.impl.RedisServiceImpl; import com.ys.vo.IqProduct; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; import java.util.ArrayList; import java.util.Date; import java.util.List; @RestController public class RedisServiceController { @Autowired private RedisServiceImpl redisService; @RequestMapping(value = "/setredis") public String setredis(String keyredis){ redisService.setStr(keyredis,"2018年1月26日"); return "保存成功,请访问getredis查询redis"; } @RequestMapping(value = "/setObj") public String setObj(String keyredis){ IqProduct iqProduct = new IqProduct(); iqProduct.setSort(1); iqProduct.setTimestamp(new Date().getTime()); iqProduct.setProductName("productname"); // list.add(iqProduct); redisService.set(keyredis, iqProduct); return "保存成功,请访问getredis查询redis"; } @RequestMapping(value = "/getObj") public Object getObj(String keyredis){ Object object = redisService.get(keyredis); if(object !=null){ IqProduct iqProduct = (IqProduct) object; System. out.println(iqProduct.getProductName()); System. out.println(iqProduct.getId()); System. out.println(iqProduct.getTimestamp()); }return object; } @RequestMapping(value = "/delObj") public boolean delObj(String keyredis) {boolean del = redisService.del(keyredis); return del; } @RequestMapping(value = "/getredis") public String getredis(String keyredis){ String getredis = (String) redisService.getKey(keyredis); return "redis的key是===>"+getredis; } @RequestMapping(value = "/delredis") public String delredis(String keyredis){ redisService.delKey(keyredis); return "删除成功,永茂林地入口,请通过getredis进行查询"; } @RequestMapping(value = "/setList") public String setList(String keyredis){ List list = new ArrayList();for (int i = 0;i<10;i++){ IqProduct iqProduct = new IqProduct(); iqProduct.setSort(1); iqProduct.setTimestamp(new Date().getTime()); iqProduct.setProductName("productname"); list.add(iqProduct); } redisService.set(keyredis, list); return "保存成功,请访问getredis查询redis"; } @RequestMapping(value = "/getList") public Object getList(String keyredis){ Object object = redisService.get(keyredis); if(object !=null){ List iqProducts = (List) object; for (int i = 0;i
本文地址:/wenhua/20190810/25301.html 转载请注明出处!
相关文章:
  1. [国际新闻]如何对抗全球变暖?联天阅网合国专家:从少吃
  2. [新闻资讯]看锤石如何一刀秒大龙美国经济增长前景面临巨
  3. [专题专栏]看锤石如何一刀秒大龙中国新闻稿援引驻港有关