基于spring Boot 1.5.2.RELEASE版本，一方面驗證與Redis的集成方法，另外了解使用方法。
集成方法
1、配置依賴
修改pom.xml，增加如下內容。
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<dependency> <groupId>org.springframework.boot</groupId> </dependency> |
2、配置Redis
修改application.yml，增加如下內容。
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spring: redis: host: localhost port: 6379 pool: max-idle: 8 min-idle: 0 max-active: 8 max-wait: -1 |
3、配置Redis緩存
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package net.jackieathome.cache;import java.lang.reflect.Method;import org.springframework.cache.CacheManager;import org.springframework.cache.annotation.CachingConfigurerSupport;import org.springframework.cache.annotation.EnableCaching;import org.springframework.cache.interceptor.KeyGenerator;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.data.redis.cache.RedisCacheManager;import org.springframework.data.redis.connection.RedisConnectionFactory;import org.springframework.data.redis.core.RedisTemplate;import org.springframework.data.redis.core.StringRedisTemplate;import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;import com.fasterxml.jackson.annotation.JsonAutoDetect;import com.fasterxml.jackson.annotation.PropertyAccessor;import com.fasterxml.jackson.databind.ObjectMapper;@Configuration@EnableCaching // 啟用緩存特性public class RedisConfig extends CachingConfigurerSupport { // 緩存數據時Key的生成器，可以依據業務和技術場景自行定制// @Bean// public KeyGenerator customizedKeyGenerator() {// return new KeyGenerator() {// @Override// public Object generate(Object target, Method method, Object... params) {// StringBuilder sb = new StringBuilder();// sb.append(target.getClass().getName());// sb.append(method.getName());// for (Object obj : params) {// sb.append(obj.toString());// }// return sb.toString();// }// };//// } // 定制緩存管理器的屬性，默認提供的CacheManager對象可能不能滿足需要 // 因此建議依賴業務和技術上的需求，自行做一些擴展和定制 @Bean public CacheManager cacheManager(@SuppressWarnings("rawtypes") RedisTemplate redisTemplate) { RedisCacheManager redisCacheManager = new RedisCacheManager(redisTemplate); redisCacheManager.setDefaultExpiration(300); return redisCacheManager; } @Bean public RedisTemplate<String, String> redisTemplate(RedisConnectionFactory factory) { StringRedisTemplate template = new StringRedisTemplate(factory); Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class); ObjectMapper om = new ObjectMapper(); om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY); om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL); jackson2JsonRedisSerializer.setObjectMapper(om); template.setValueSerializer(jackson2JsonRedisSerializer); template.afterPropertiesSet(); return template; }} |
驗證集成后的效果
考慮到未來參與的項目基于MyBatis實現數據庫訪問，而利用緩存，可有效改善Web頁面的交互體驗，因此設計了如下兩個驗證方案。
方案一
在訪問數據庫的數據對象上增加緩存注解，定義緩存策略。從測試效果看，緩存有效。
1、頁面控制器
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package net.jackieathome.controller;import java.util.List;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.RestController;import net.jackieathome.bean.User;import net.jackieathome.dao.UserDao;import net.jackieathome.db.mapper.UserMapper;@RestControllerpublic class UserController { @Autowired private UserDao userDao; @RequestMapping(method = RequestMethod.GET, value = "/user/id/{id}") public User findUserById(@PathVariable("id") String id) { return userDao.findUserById(id); } @RequestMapping(method = RequestMethod.GET, value = "/user/create") public User createUser() { long time = System.currentTimeMillis() / 1000; String id = "id" + time; User user = new User(); user.setId(id); userDao.createUser(user); return userDao.findUserById(id); }} |
2、Mapper定義
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package net.jackieathome.db.mapper;import java.util.List;import org.apache.ibatis.annotations.Mapper;import org.apache.ibatis.annotations.Param;import org.springframework.cache.annotation.CacheConfig;import org.springframework.cache.annotation.CachePut;import org.springframework.cache.annotation.Cacheable;import net.jackieathome.bean.User;@Mapperpublic interface UserMapper { void createUser(User user); User findUserById(@Param("id") String id);} |
3、數據訪問對象
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package net.jackieathome.dao;import java.util.ArrayList;import java.util.List;import org.apache.ibatis.annotations.Param;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.cache.annotation.CacheConfig;import org.springframework.cache.annotation.CachePut;import org.springframework.cache.annotation.Cacheable;import org.springframework.stereotype.Component;import org.springframework.transaction.annotation.Transactional;import net.jackieathome.bean.User;import net.jackieathome.db.mapper.UserMapper;@Component@CacheConfig(cacheNames = "users")@Transactionalpublic class UserDao { private static final Logger LOG = LoggerFactory.getLogger(UserDao.class); @Autowired private UserMapper userMapper; @CachePut(key = "#p0.id") public void createUser(User user) { userMapper.createUser(user); LOG.debug("create user=" + user); } @Cacheable(key = "#p0") public User findUserById(@Param("id") String id) { LOG.debug("find user=" + id); return userMapper.findUserById(id); }} |
方案二
直接在Mapper定義上增加緩存注解，控制緩存策略。從測試效果看，緩存有效，相比于方案一，測試代碼更加簡潔一些。
1、頁面控制器
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package net.jackieathome.controller;import java.util.List;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.RestController;import net.jackieathome.bean.User;import net.jackieathome.dao.UserDao;import net.jackieathome.db.mapper.UserMapper;@RestControllerpublic class UserController { @Autowired private UserMapper userMapper; @RequestMapping(method = RequestMethod.GET, value = "/user/id/{id}") public User findUserById(@PathVariable("id") String id) { return userMapper.findUserById(id); } @RequestMapping(method = RequestMethod.GET, value = "/user/create") public User createUser() { long time = System.currentTimeMillis() / 1000; String id = "id" + time; User user = new User(); user.setId(id); userMapper.createUser(user); return userMapper.findUserById(id); }} |
2、Mapper定義
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package net.jackieathome.db.mapper;import java.util.List;import org.apache.ibatis.annotations.Mapper;import org.apache.ibatis.annotations.Param;import org.springframework.cache.annotation.CacheConfig;import org.springframework.cache.annotation.CachePut;import org.springframework.cache.annotation.Cacheable;import net.jackieathome.bean.User;@CacheConfig(cacheNames = "users")@Mapperpublic interface UserMapper { @CachePut(key = "#p0.id") void createUser(User user); @Cacheable(key = "#p0") User findUserById(@Param("id") String id);} |
總結
上述兩個測試方案并沒有優劣之分，僅是為了驗證緩存的使用方法，體現了不同的控制粒度，在實際的項目開發過程中，需要依據實際情況做不同的決斷。
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持服務器之家。
原文鏈接：http://blog.csdn.net/jackie_xiaonan/article/details/70187752
