25、springboot与缓存整合Redis

默认使用ConcurrentMapCacheManager 将数据保存在下面的Map中

docker：

安装Redis：

查看官方文档：

添加约束

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

此时redis就引入再容器中

可以查看自动配置的类：RedisAutoConfiguration.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;
    }
}

在配置文件中引入redis的地址：

测试：

此时两个操作redis的类都在容器中：

//操作kv键值对的
@Autowired
RedisTemplate redisTemplate;

//操作kv都是字符串
@Autowired
StringRedisTemplate stringRedisTemplate;

测试：

测试添加对象：

 

对象实现类需要实现序列化

public class Employee  implements Serializable {

//测试保存对象
@Test
public  void test2(){
    //保存的是emp的对象
    Employee emp = employeeMapper.getEmpById();
    //保存的是employee的对象
    //默认如果使用保存对象，使用jdk序列化机制，序列化后的数据保存在redis中
    redisTemplate.opsForValue().set("emp01",emp);
}

//测试天对保存对象2

 

首先是自动一序列化器

@Configuration
public class redisConfig {
    //专门序列化Employee
    @Bean
    public RedisTemplate<Object, Employee> redisTemplateEmp(RedisConnectionFactory redisConnectionFactory) throws UnknownHostException {
        RedisTemplate<Object, Employee> template = new RedisTemplate();
        template.setConnectionFactory(redisConnectionFactory);

        Jackson2JsonRedisSerializer<Employee> json = new Jackson2JsonRedisSerializer<Employee>(Employee.class);
        template.setDefaultSerializer(json);
return template;
    }
}

@Autowired
RedisTemplate redisTemplateEmp;

//测试保存对象
@Test
public  void test2(){
    //保存的是emp的对象
    Employee emp = employeeMapper.getEmpById();
    //将数据以json的方式
    //实现redisTemplate默认的序列化规则，改变默认的序列化规则
    redisTemplateEmp.opsForValue().set("emp1",emp);
}

测试缓存：

原理：

1、引入redis的starter，容器自动导入的是RedisCacheManage

2、RedisCacheManager帮我们自动创建RedisCache, redis通过操作redis缓存数据的

RedisCacheConfiguration.class

@Bean
public RedisCacheManager cacheManager(RedisConnectionFactory redisConnectionFactory, ResourceLoader resourceLoader) {
    RedisCacheManagerBuilder builder = RedisCacheManager.builder(redisConnectionFactory).cacheDefaults(this.determineConfiguration(resourceLoader.getClassLoader()));
    List<String> cacheNames = this.cacheProperties.getCacheNames();
    if (!cacheNames.isEmpty()) {
        builder.initialCacheNames(new LinkedHashSet(cacheNames));
    }

    return (RedisCacheManager)this.customizerInvoker.customize(builder.build());
}

protected Collection<RedisCache> loadCaches() {
    List<RedisCache> caches = new LinkedList();
    Iterator var2 = this.initialCacheConfiguration.entrySet().iterator();

    while(var2.hasNext()) {
        Entry<String, RedisCacheConfiguration> entry = (Entry)var2.next();
        caches.add(this.createRedisCache((String)entry.getKey(), (RedisCacheConfiguration)entry.getValue()));
    }

    return caches;
}

 

查询之后。再点击刷新依然是这个页面

3、默认保存数据都是k-v都是object，利用序列化来保存   

查看缓存：

4、让保存的数据为json

    1.引入redis的starter，cacheManager变为RedisCacheManager

    2.默认创建的RedisCacheManager，再操作数据的     RedisConnectionFactory 

    RedisCacheConfiguration

@Bean
public RedisCacheManager cacheManager(RedisConnectionFactory redisConnectionFactory, ResourceLoader resourceLoader) {
    RedisCacheManagerBuilder builder = RedisCacheManager.builder(redisConnectionFactory).cacheDefaults(this.determineConfiguration(resourceLoader.getClassLoader()));
    List<String> cacheNames = this.cacheProperties.getCacheNames();
    if (!cacheNames.isEmpty()) {
        builder.initialCacheNames(new LinkedHashSet(cacheNames));
    }

    return (RedisCacheManager)this.customizerInvoker.customize(builder.build());
}

public class 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;
    }

  3.默认使用的是JdkSerializationRedisSerializer

RedisTemplate.java

public void afterPropertiesSet() {
    super.afterPropertiesSet();
    boolean defaultUsed = false;
    if (this.defaultSerializer == null) {
this.defaultSerializer = new JdkSerializationRedisSerializer(this.classLoader != null ? this.classLoader : this.getClass().getClassLoader());
    }

}

    4.自定义

springboot的1.5