SpringBoot系列：Spring Boot集成Spring Cache，使用RedisCache
<p>前面的章节，讲解了Spring Boot集成Spring Cache，Spring Cache已经完成了多种Cache的实现，包罗EhCache、RedisCache、ConcurrentMapCache等。</p><p>这一节我们来看看Spring Cache利用RedisCache。</p>
<h3 id="一rediscache利用演示">一、RedisCache利用演示</h3>
<p>Redis是一个key-value存储体系，在web应用上被广泛应用，这里就不对其过多形貌了。</p>
<p>本章节示例是在Spring Boot集成Spring Cache的源码基础上举行改造。源码地点：https://github.com/imyanger/springboot-project/tree/master/p20-springboot-cache</p>
<p>利用RedisCache作为缓存，我们先引入相干依赖。</p>
<code><dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!--redis依赖-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
</dependency></code>
<p>然后SpringBoot设置文件中，对redis举行设置。</p>
<code>server:
port: 10900
spring:
profiles:
active: dev
redis:
host: localhost #redis服务器地点
port: 6379 #redis端口
password: 1234 #redis暗码
timeout: 60000 #连接超时时间
database: 0 #数据库索引，默认为0</code>
<p>SpringBoot中利用Redis，可以通过Spring Cache的注解，也可以利用RedisTemplate来实现，大部分情况下，由于注解存在肯定范围性不敷机动，一般实际开辟中都是利用的RedisTemplate。</p>
<p>附上CacheConfig注入RedisTemplate，假如不必要利用RedisTemplate，直接将@EnableCaching注解加在SpringBoot启动类上即可。</p>
<code>@Configuration
@EnableCaching
public class CacheConfig {
@Bean
public RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory connectionFactory) {
RedisTemplate<String, Object> redisTemplate = new RedisTemplate<>();
redisTemplate.setConnectionFactory(connectionFactory);
// 利用Jackson2JsonRedisSerializer来序列化和反序列化redis的value值（默认利用JDK的序列化方式）
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);
redisTemplate.setValueSerializer(serializer);
// 利用StringRedisSerializer来序列化和反序列化redis的key值
redisTemplate.setKeySerializer(new StringRedisSerializer());
redisTemplate.afterPropertiesSet();
return redisTemplate;
}
}</code>
<p>如许就可以开始利用RedisCache了，测试代码与Spring Boot集成Spring Cache一致。</p>
<p>CacheApi接口调用类，方便调用举行测试。</p>
<code>@RestController
@RequestMapping("cache")
public class CacheApi {
@Autowired
private CacheService cacheService;
@GetMapping("get")
public Userget(@RequestParam int id){
return cacheService.get(id);
}
@PostMapping("set")
public Userset(@RequestParam int id, @RequestParam String code, @RequestParam String name){
User u = new User(code, name);
return cacheService.set(id, u);
}
@DeleteMapping("del")
public voiddel(@RequestParam int id){
cacheService.del(id);
}
}</code>
<p>CacheService缓存业务处置惩罚类，添加缓存，更新缓存和删除。</p>
<code>@Slf4j
@Service
public class CacheService {
private Map<Integer, User> dataMap = new HashMap <Integer, User>(){
{
for (int i = 1; i < 100 ; i++) {
User u = new User("code" + i, "name" + i);
put(i, u);
}
}
};
// 获取数据
@Cacheable(value = "cache", key = "'user:' + #id")
public User get(int id){
log.info("通过id{}查询获取", id);
return dataMap.get(id);
}
// 更新数据
@CachePut(value = "cache", key = "'user:' + #id")
public User set(int id, User u){
log.info("更新id{}数据", id);
dataMap.put(id, u);
return u;
}
//删除数据
@CacheEvict(value = "cache", key = "'user:' + #id")
public void del(int id){
log.info("删除id{}数据", id);
dataMap.remove(id);
}
}</code>
<p>启动服务举行测试，可以看到缓存功能正常，且打开redis举行查看，也能看到对应的缓存数据。</p>
<p>源码地点：https://github.com/imyanger/springboot-project/tree/master/p21-springboot-cache-redis</p><br><br/><br/><br/><br/><br/>来源：<a href="https://www.cnblogs.com/imyanger/p/11729490.html" target="_blank">https://www.cnblogs.com/imyanger/p/11729490.html</a>
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