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，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;
@Bean
public 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;
/** * @author Administrator * */ 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); } /**set Object*/ public String set(String key,Object object) { return jedis.set(key.getBytes(), SerializeUtil.serialize(object)); } /**get Object*/ public Object get(String key) { byte[] value = jedis.get(key.getBytes()); return SerializeUtil. unserialize(value); } /**delete a 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，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<IqProduct> iqProducts = (List<IqProduct>) object; for (int i = 0;i<iqProducts.size();i++){ IqProduct iqProduct = iqProducts.get(i); System. out.println(iqProduct.getProductName()); System. out.println(iqProduct.getId()); System. out.println(iqProduct.getTimestamp()); } } return object; } @RequestMapping(value = "/delList") public boolean delList(String keyredis){ boolean del = redisService.del(keyredis); return del; } } 6.测试结果
image.png
7.参考文章
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