在工作中,咱们用到分布式缓存的时候,第一抉择就是Redis,明天介绍一下SpringBoot如何集成Redis的,别离应用Jedis和Spring-data-redis两种形式。

一、应用Jedis形式集成

1、减少依赖

<!-- spring-boot-starter-web不是必须的,这里是为了测试--><dependency>    <groupId>org.springframework.boot</groupId>    <artifactId>spring-boot-starter-web</artifactId></dependency><dependency>    <groupId>org.projectlombok</groupId>    <artifactId>lombok</artifactId>    <optional>true</optional></dependency><dependency>    <groupId>redis.clients</groupId>    <artifactId>jedis</artifactId></dependency><dependency><!-- fastjson不是必须的,这里是为了测试-->    <groupId>com.alibaba</groupId>    <artifactId>fastjson</artifactId>    <version>1.2.73</version></dependency>

2、配置项

redis.host=localhostredis.maxTotal=5redis.maxIdle=5redis.testOnBorrow=true#以下形式也能够,SpringBoot同样能将其解析注入到JedisPoolConfig中#redis.max-total=3#redis.max-idle=3#redis.test-on-borrow=true

3、配置连接池

/** * @author 公-众-号:程序员阿牛 * 因为Jedis实例自身不非线程平安的,因而咱们用JedisPool */@Configurationpublic class CommonConfig {    @Bean    @ConfigurationProperties("redis")    public JedisPoolConfig jedisPoolConfig() {        return new JedisPoolConfig();    }    @Bean(destroyMethod = "close")    public JedisPool jedisPool(@Value("${redis.host}") String host) {        return new JedisPool(jedisPoolConfig(), host);    }}

4、测试

/** * @author 公-众-号:程序员阿牛 */@RestControllerpublic class JedisController {    @Autowired    private JedisPool jedisPool;    @RequestMapping("getUser")    public String getUserFromRedis(){        UserInfo userInfo = new UserInfo();        userInfo.setUserId("A0001");        userInfo.setUserName("张三丰");        userInfo.setAddress("武当山");        jedisPool.getResource().set("userInfo", JSON.toJSONString(userInfo));        UserInfo userInfo1 = JSON.parseObject(jedisPool.getResource().get("userInfo"),UserInfo.class);        return userInfo1.toString();    }}

运行后果如下:

咱们能够本人包装一个RedisClient,来简化咱们的操作

应用spring-data-redis

1、引入依赖

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

2、配置项

在application.properties中减少配置

spring.redis.host=localhostspring.redis.port=6379

3、应用

/** * @author 公-众-号:程序员阿牛 */@RestControllerpublic class RedisController {    @Autowired    private RedisTemplate redisTemplate;    @RequestMapping("getUser2")    public String getUserFromRedis(){        UserInfo userInfo = new UserInfo();        userInfo.setUserId("A0001");        userInfo.setUserName("张三丰");        userInfo.setAddress("武当山");        redisTemplate.opsForValue().set("userInfo", userInfo);        UserInfo userInfo1 = (UserInfo) redisTemplate.opsForValue().get("userInfo");        return userInfo1.toString();    }}

是的,你只须要引入依赖、退出配置就能够应用Redis了,不要快乐的太早,这外面会有一些坑

4、可能会遇到的坑


应用工具查看咱们方才set的内容,发现key后面多了一串字符,value也是不可见的

起因

应用springdataredis,默认状况下是应用org.springframework.data.redis.serializer.JdkSerializationRedisSerializer这个类来做序列化
具体咱们看一下RedisTemplate 代码如何实现的

/***在初始化的时候,默认的序列化类是JdkSerializationRedisSerializer*/public void afterPropertiesSet() {        super.afterPropertiesSet();        boolean defaultUsed = false;        if (this.defaultSerializer == null) {            this.defaultSerializer = new JdkSerializationRedisSerializer(this.classLoader != null ? this.classLoader : this.getClass().getClassLoader());        }   ...省略无关代码}
如何解决

很简略,本人定义RedisTemplate并指定序列化类即可

/** * @author 公-众-号:程序员阿牛 */@Configurationpublic class RedisConfig {    @Bean    public RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory connectionFactory) {        RedisTemplate<String, Object> template = new RedisTemplate<>();        template.setConnectionFactory(connectionFactory);        template.setValueSerializer(jackson2JsonRedisSerializer());        //应用StringRedisSerializer来序列化和反序列化redis的key值        template.setKeySerializer(new StringRedisSerializer());        template.setHashKeySerializer(new StringRedisSerializer());        template.setHashValueSerializer(jackson2JsonRedisSerializer());        template.afterPropertiesSet();        return template;    }    @Bean    public RedisSerializer<Object> jackson2JsonRedisSerializer() {        //应用Jackson2JsonRedisSerializer来序列化和反序列化redis的value值        Jackson2JsonRedisSerializer serializer = new Jackson2JsonRedisSerializer(Object.class);        ObjectMapper mapper = new ObjectMapper();        mapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);        mapper.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);        serializer.setObjectMapper(mapper);        return serializer;    }}

查看运行后果:

哨兵和集群

只须要改一下配置项即可

# 哨兵spring.redis.sentinel.master=mymasterspring.redis.sentinel.nodes=127.0.0.1:26379,127.0.0.1:26380,127.0.0.1:26381#集群spring.redis.cluster.max-redirects=100spring.redis.cluster.nodes=127.0.0.1:6379,127.0.0.1:6380,127.0.0.1:6381,127.0.0.1:6382,127.0.0.1:6383,127.0.0.1:6384

总结:

以上两种形式都能够,然而还是倡议你应用Spring-data-redis,因为Spring通过多年的倒退,尤其是Springboot的日渐成熟,曾经为咱们简化了很多操作。