Spring Boot 使用 Cache

最新推荐文章于 2023-04-10 15:50:45 发布

xpplrm

最新推荐文章于 2023-04-10 15:50:45 发布

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CC 4.0 BY-SA版权

文章标签： java 缓存

本文链接：https://blog.youkuaiyun.com/xpplrm/article/details/115487360

本文档展示了如何在Java应用中初始化并使用EhCache进行缓存管理。通过@Bean注解配置EhCacheManager，从类路径加载配置文件。接着创建Service，实现缓存的增删查改操作，包括设置缓存值、检查键是否存在及获取缓存值。在实际调用中，结合@Async异步处理，保存数据到数据库并同步更新缓存。此外，还展示了如何在不同组件中注入和使用特定的Cache实例。

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1 初始化 EhCacheManager


	@Bean
	public EhCacheManager ehCacheManager() {
		EhCacheManager em = new EhCacheManager();
		em.setCacheManagerConfigFile("classpath:config/ehcache.xml");
		return em;
	}

2 创建service


    @Autowired
    private EhCacheManager ehCacheCacheManager;

    private Cache getCache(String name) {
        //获取CacheManager类
        CacheManager cacheManager = ehCacheCacheManager.getCacheManager();
        //获取Cache
        Cache cache = cacheManager.getCache(name);

        return cache;
    }


    /**
     * 数据存入缓存
     *
     * @param name
     * @param key
     * @param obj
     */
    @Override
    public void setCacheValue(String name, String key, Object obj) {
        this.getCache(name).put(new Element(key, obj));
    }

    /**
     * 判断key是否存在
     *
     * @param name
     * @param key
     * @return
     */
    @Override
    public boolean isKeyInCache(String name, String key) {
        //获取Cache
        Cache cache = this.getCache(name);

        //ehcache惰性删除机制，缓存失效后key有可能依然存在
        if (cache != null && cache.isKeyInCache(key)) {
            return cache.get(key) == null ? false : true;
        } else {
            return false;
        }
    }

    /**
     * 获取key对应的缓存数据
     *
     * @param name
     * @param key
     * @return
     */
    @Override
    public Object getCacheValue(String name, String key) {
        return isKeyInCache(name, key) == true ? this.getCache(name).get(key) : null;
    }

3 调用

@Autowired
private ICacheService cacheService;


@Override
@Async
public void save(AdapterSearchlogDO adapterSearchlog) {

  String ckey = adapterSearchlog.getSid();
  if (!cacheService.isKeyInCache("logAdd", ckey)) {
        adapterSearchlog.setCreateDate(new Date());            
        adapterSearchlog.setSearchDate(DateUtils.getCheckDay(0));
        int isSave = adapterSearchlogDao.save(adapterSearchlog);
        if (isSave > 0) {
            cacheService.setCacheValue("logAdd", ckey, ckey);
        }
    } 
 }

3 特殊调用

@Service
@Component
public class RewriterCore {

   private Cache dowCache; 

	public Cache getDowCache() {
		return dowCache;
	}
	public void setDowCache(Cache dowCache) {
		this.dowCache = dowCache;
	}
}




@Service
@Configuration
@AutoConfigureBefore(XssConfig.class)
public class UrlAuthConfig {



 @Bean(name = "ehCacheCacheManager")
 @ConditionalOnMissingBean
 public net.sf.ehcache.CacheManager ehCacheCacheManager() {
      return CacheManager.create();
 }


/**
  * 授权重写配置
 */
@Bean(initMethod = "init", name = "rewriterCore") // 声明其为Bean实例
public RewriterCore getRewriterCoreBean() {
        RewriterCore reg = new RewriterCore();
        reg.setStats(false);
        reg.setConfigLoader(configLoader);
        reg.setSessionListener(sessionListener);
        reg.setRewriterListener(rewriterListener);
        reg.setAiRwtCache(ehCacheCacheManager().getCache("aiRwtCache"));
        reg.setDowCache(ehCacheCacheManager().getCache("downCache"));
        reg.setHttpResponseCache(getHttpResponseCacheBean());
        reg.setSessionTimeout(30);
        return reg;
 }




}