springboot_redis

Posted 2022-02-14 ustc-anmin

1.引入redis的启动器

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

2.指定redis的主机地址

3.自动注入模板

    @Autowired
    StringRedisTemplate stringRedisTemplate;   //k v都是字符串的

    @Autowired
    RedisTemplate<Object, Object> redisTemplate;   //k v都是对象的

 redsiAutoConfiguration:

//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by Fernflower decompiler)
//

package org.springframework.boot.autoconfigure.data.redis;

import java.net.UnknownHostException;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.RedisOperations;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.StringRedisTemplate;

@Configuration
@ConditionalOnClass(RedisOperations.class)
@EnableConfigurationProperties(RedisProperties.class)
@Import(LettuceConnectionConfiguration.class, JedisConnectionConfiguration.class)
public class RedisAutoConfiguration 
    public RedisAutoConfiguration() 
    

    @Bean
    @ConditionalOnMissingBean(
        name = "redisTemplate"
    )
    public RedisTemplate<Object, Object> redisTemplate(RedisConnectionFactory redisConnectionFactory) throws UnknownHostException 
        RedisTemplate<Object, Object> template = new RedisTemplate();
        template.setConnectionFactory(redisConnectionFactory);
        return template;
    

    @Bean
    @ConditionalOnMissingBean
    public StringRedisTemplate stringRedisTemplate(RedisConnectionFactory redisConnectionFactory) throws UnknownHostException 
        StringRedisTemplate template = new StringRedisTemplate();
        template.setConnectionFactory(redisConnectionFactory);
        return template;
    

View Code

 @Test
    public void test01()
        stringRedisTemplate.opsForValue().append("k2","_append_k2");
    

---

 测试保存对象:

@Test
    public void test02()
        User user = new User();
        user.setId(36);
        user.setAddress("上海市黄浦区赵家桥285号");
        user.setAge(21);
        user.setSex(1);
        user.setName("包青天");
        redisTemplate.opsForValue().set("usr1",user);//默认以java序列化的形式保存
    

 

---

 添加配置，使其能以json的数据形式存入redis中：

package ustc.anmin.springboot.service;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;
import ustc.anmin.springboot.bean.User;

import java.net.UnknownHostException;

@Configuration
public class MyRedisConfig 

    @Bean
    public RedisTemplate<Object, User> userRedisTemplate(RedisConnectionFactory redisConnectionFactory) throws UnknownHostException 
        RedisTemplate<Object, User> template = new RedisTemplate();
        //关键
        template.setDefaultSerializer(new Jackson2JsonRedisSerializer<User>(User.class));
        template.setConnectionFactory(redisConnectionFactory);
        return template;
    

 

 

---

 将redis设为缓存中间件：

1.在pom.xml中引入redis的starter

2.将数据格式转为json形式  要修改redisManager

    @Bean
    public CacheManager cacheManager(RedisConnectionFactory redisConnectionFactory) 
        //初始化一个RedisCacheWriter
        RedisCacheWriter redisCacheWriter = RedisCacheWriter.nonLockingRedisCacheWriter(redisConnectionFactory);
        //设置CacheManager的值序列化方式为json序列化
        RedisSerializer<Object> jsonSerializer = new GenericJackson2JsonRedisSerializer();
        RedisSerializationContext.SerializationPair<Object> pair = RedisSerializationContext.SerializationPair
                .fromSerializer(jsonSerializer);
        RedisCacheConfiguration defaultCacheConfig=RedisCacheConfiguration.defaultCacheConfig()
                .serializeValuesWith(pair);
        //设置默认超过期时间是30秒
        defaultCacheConfig.entryTtl(Duration.ofSeconds(30));
        //初始化RedisCacheManager
        return new RedisCacheManager(redisCacheWriter, defaultCacheConfig);
    

 

其余设置与spring-boot启动缓存的方式一样。