sprig boot 整合 redis 缓存

1、引入redis的starter依赖

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>

2、配置redsi地址

(一) 简单配置

spring.redis.host=localhost

(二) 详细配置

# spring redis
# Redis服务器地址
spring.redis.host=127.0.0.1
# REDIS (RedisProperties)
# Redis数据库索引 (默认为0)
spring.redis.database=0
# Redis服务器连接端口
spring.redis.port=6379
# Redis服务器连接密码（默认为空)
spring.redis.password=123456
# 连接池最大连接数 (使用负值表示没有限制)
spring.redis.jedis.pool.max-active=8
# 连接池最大阻塞等待时间 (使用负值表示没有限制)
spring.redis.jedis.pool.max-wait=-1
# 连接池中的最大空闲连接
spring.redis.jedis.pool.max-idle=8
# 连接池中的最小空闲连接
spring.redis.jedis.pool.min-idle=0
# 连接超时时间 单位 ms (毫秒)
spring.redis.timeout=300

3、测试缓存到redis

package com.laoxu.cache.controller;

import com.laoxu.cache.bean.Employee;
import com.laoxu.cache.service.EmployeeService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.bind.annotation.*;

@RestController
public class EmployeeController {

    @Autowired
    private EmployeeService employeeService;


    @GetMapping("/emp/{id}")
    public Employee getEmp(@PathVariable("id") Integer id){
        return employeeService.getEmployee(id);
    }

    @GetMapping("/emp")
    public Employee updateEmp(Employee employee){
        return employeeService.updateEmployee(employee);
    }
}

要将对象存到缓存中须实现序列化接口

public class Employee implements Serializable 

访问：http://localhost:8080/emp/1

redis中的值

将缓存结果序列化转为json格式

创建配置类

配置Redis

package com.laoxu.cache.config;

import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.cache.CacheManager;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.cache.RedisCacheConfiguration;
import org.springframework.data.redis.cache.RedisCacheManager;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.RedisSerializationContext;
import org.springframework.data.redis.serializer.RedisSerializer;
import org.springframework.data.redis.serializer.StringRedisSerializer;

import java.time.Duration;


@Configuration
@ConfigurationProperties(prefix = "spring.cache.redis")
public class MyRedisConfig {
    private Duration timeToLive = Duration.ZERO;
    public void setTimeToLive(Duration timeToLive) {
        this.timeToLive = timeToLive;
    }

    @Bean
    public CacheManager cacheManager(RedisConnectionFactory factory) {
        RedisSerializer<String> redisSerializer = new StringRedisSerializer();
        Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);

        //解决查询缓存转换异常的问题
        ObjectMapper om = new ObjectMapper();
        om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
        jackson2JsonRedisSerializer.setObjectMapper(om);

        // 配置序列化（解决乱码的问题）
        RedisCacheConfiguration config = RedisCacheConfiguration.defaultCacheConfig()
                .entryTtl(timeToLive)
                .serializeKeysWith(RedisSerializationContext.SerializationPair.fromSerializer(redisSerializer))
                .serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(jackson2JsonRedisSerializer))
                .disableCachingNullValues();

        RedisCacheManager cacheManager = RedisCacheManager.builder(factory)
                .cacheDefaults(config)
                .build();
        return cacheManager;
    }
}

其中setTimeToLive表示缓存过期时间

redis中的值

扩展：操作redis工具类

package com.neo.service;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.*;
import org.springframework.stereotype.Service;

import java.io.Serializable;
import java.util.List;
import java.util.Set;
import java.util.concurrent.TimeUnit;

@Service
public class RedisService {
    private Logger logger = LoggerFactory.getLogger(RedisService.class);
    @Autowired
    private RedisTemplate redisTemplate;

    /**
     * 存值
     * set value
     * @param key
     * @param value
     * @return
     */
    public boolean set(final String key, Object value) {
        boolean result = false;
        try {
            ValueOperations<Serializable, Object> operations = redisTemplate.opsForValue();
            operations.set(key, value);
            result = true;
        } catch (Exception e) {
            logger.error("set error: key {}, value {}",key,value,e);
        }
        return result;
    }

    /**
     * 存值带失效时间
     * set value with expireTime
     * @param key
     * @param value
     * @param expireTime
     * @return
     */
    public boolean set(final String key, Object value, Long expireTime) {
        boolean result = false;
        try {
            ValueOperations<Serializable, Object> operations = redisTemplate.opsForValue();
            operations.set(key, value);
            redisTemplate.expire(key, expireTime, TimeUnit.SECONDS);
            result = true;
        } catch (Exception e) {
            logger.error("set error: key {}, value {},expireTime {}",key,value,expireTime,e);
        }
        return result;
    }

    /**
     * 判断key是否存在
     * @param key
     * @return
     */
    public boolean exists(final String key) {
        return redisTemplate.hasKey(key);
    }

    /**
     * 获取值
     * @param key
     * @return
     */
    public Object get(final String key) {
        Object result = null;
        ValueOperations<Serializable, Object> operations = redisTemplate.opsForValue();
        result = operations.get(key);
        return result;
    }

    /**
     * 删除值
     * remove single key
     * @param key
     */
    public void remove(final String key) {
        if (exists(key)) {
            redisTemplate.delete(key);
        }
    }

    /**
     * 删除多个值
     * batch delete
     * @param keys
     */
    public void remove(final String... keys) {
        for (String key : keys) {
            remove(key);
        }
    }

    /**
     * 匹配删除值
     * batch delete with pattern
     * @param pattern
     */
    public void removePattern(final String pattern) {
        Set<Serializable> keys = redisTemplate.keys(pattern);
        if (keys.size() > 0)
            redisTemplate.delete(keys);
    }

    /**
     * hash存值
     * hash set
     * @param key
     * @param hashKey
     * @param value
     */
    public void hashSet(String key, Object hashKey, Object value){
        HashOperations<String, Object, Object> hash = redisTemplate.opsForHash();
        hash.put(key,hashKey,value);
    }

    /**
     * hash获取值
     * hash get
     * @param key
     * @param hashKey
     * @return
     */
    public Object hashGet(String key, Object hashKey){
        HashOperations<String, Object, Object>  hash = redisTemplate.opsForHash();
        return hash.get(key,hashKey);
    }

    /**
     * 列表存值
     *  list push
     * @param k
     * @param v
     */
    public void push(String k,Object v){
        ListOperations<String, Object> list = redisTemplate.opsForList();
        list.rightPush(k,v);
    }

    /**
     * 列表截取范围获取值
     *  list range
     * @param k
     * @param l
     * @param l1
     * @return
     */
    public List<Object> range(String k, long l, long l1){
        ListOperations<String, Object> list = redisTemplate.opsForList();
        return list.range(k,l,l1);
    }

    /**
     * 添加一个元素到集合中
     *  set add
     * @param key
     * @param value
     */
    public void setAdd(String key,Object value){
        SetOperations<String, Object> set = redisTemplate.opsForSet();
        set.add(key,value);
    }

    /**
     * 获取集合中所有元素
     * set get
     * @param key
     * @return
     */
    public Set<Object> setMembers(String key){
        SetOperations<String, Object> set = redisTemplate.opsForSet();
        return set.members(key);
    }

    /**
     * 有序添加元素到集合中
     * ordered set add
     * @param key
     * @param value
     * @param scoure
     */
    public void zAdd(String key,Object value,double scoure){
        ZSetOperations<String, Object> zset = redisTemplate.opsForZSet();
        zset.add(key,value,scoure);
    }

    /**
     * 根据优先级截取范围
     * rangeByScore
     * @param key
     * @param scoure
     * @param scoure1
     * @return
     */
    public Set<Object> rangeByScore(String key,double scoure,double scoure1){
        ZSetOperations<String, Object> zset = redisTemplate.opsForZSet();
        return zset.rangeByScore(key, scoure, scoure1);
    }
}

更详细的工具类：RedisUtil.java