1.加入相关依赖包：
4.0.0 springBootD demo 0.0.1-SNAPSHOT jar demo Demo project for Spring Boot org.springframework.boot spring-boot-starter-parent 2.0.3.RELEASE UTF-8 UTF-8 1.8 org.mybatis.spring.boot mybatis-spring-boot-starter 1.3.2 org.springframework.boot spring-boot-starter-data-redis org.springframework.boot spring-boot-starter-web mysql mysql-connector-java runtime org.springframework.boot spring-boot-starter-test test io.springfox springfox-swagger2 2.6.1 io.springfox springfox-swagger-ui 2.6.1 org.springframework.boot spring-boot-maven-plugin org.mybatis.generator mybatis-generator-maven-plugin 1.3.2 src/main/resources/generatorConfig.xml true true Generate MyBatis Artifacts generate org.mybatis.generator mybatis-generator-core 1.3.2
2.springboot配置文件：
#数据库配置spring.datasource.data-username=com.mysql..jdbc.Driverspring.datasource.url=jdbc:mysql://localhost:3306/springboot?seUnicode=true&characterEncoding=utf8&characterSetResults=utf8spring.datasource.username=rootspring.datasource.password=root#redis配置spring.redis.host=localhostspring.redis.port=6379spring.redis.database=1spring.redis.jedis.pool.max-active=8spring.redis.jedis.pool.max-wait= -1msspring.redis.jedis.pool.max-idle=500#mybatismybatis.mapper-locations=classpath*:mybatis/mapper/**/*.xml#开启MyBatis的二级缓存mybatis.configuration.cache-enabled=true#日志配置logging.level.springbootd.demo=debuglogging.level.org.springframework.web=debuglogging.level.org.springframework.transaction=debuglogging.level.org.mybatis=debug
3.建立获取spring容器获取bean工具类，通过Spring Aware（容器感知）来获取到ApplicationContext，然后根据ApplicationContext获取容器中的Bean，因为RedisTemplate的bean不能用@Autowired注解注入
package springbootd.demo.util;import org.springframework.context.ApplicationContext;import org.springframework.context.ApplicationContextAware;import org.springframework.stereotype.Component;@Componentpublic class ApplicationContextHolder implements ApplicationContextAware{ private static ApplicationContext applicationContext; /** * 实现ApplicationContextAware接口的context注入函数, 将其存入静态变量. */ public void setApplicationContext(ApplicationContext applicationContext) { ApplicationContextHolder.applicationContext = applicationContext; // NOSONAR } /** * 取得存储在静态变量中的ApplicationContext. */ public static ApplicationContext getApplicationContext() { checkApplicationContext(); return applicationContext; } /** * 从静态变量ApplicationContext中取得Bean, 自动转型为所赋值对象的类型. */ @SuppressWarnings("unchecked") public static T getBean(String name) { checkApplicationContext(); return (T) applicationContext.getBean(name); } /** * 从静态变量ApplicationContext中取得Bean, 自动转型为所赋值对象的类型. */ @SuppressWarnings("unchecked") public static T getBean(Class clazz) { checkApplicationContext(); return (T) applicationContext.getBeansOfType(clazz); } /** * 清除applicationContext静态变量. */ public static void cleanApplicationContext() { applicationContext = null; } private static void checkApplicationContext() { if (applicationContext == null) { throw new IllegalStateException("applicaitonContext未注入,请在applicationContext.xml中定义SpringContextHolder"); } }}
4.实现mybatis缓存接口：
package springbootd.demo.util;import org.apache.ibatis.cache.Cache;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.data.redis.core.RedisCallback;import org.springframework.data.redis.core.RedisTemplate;import org.springframework.data.redis.core.ValueOperations;import java.util.concurrent.TimeUnit;import java.util.concurrent.locks.ReadWriteLock;import java.util.concurrent.locks.ReentrantReadWriteLock;public class MybatisRedisCache implements Cache { private static final Logger logger = LoggerFactory.getLogger(MybatisRedisCache.class); private final ReadWriteLock readWriteLock = new ReentrantReadWriteLock(); private final String id; // cache instance id private RedisTemplate redisTemplate; private static final long EXPIRE_TIME_IN_MINUTES = 30; // redis过期时间 public MybatisRedisCache(String id) { if (id == null) { throw new IllegalArgumentException("Cache instances require an ID"); } this.id = id; } @Override public String getId() { return id; } /** * Put query result to redis * * @param key * @param value */ @Override @SuppressWarnings("unchecked") public void putObject(Object key, Object value) { RedisTemplate redisTemplate = getRedisTemplate(); ValueOperations opsForValue = redisTemplate.opsForValue(); opsForValue.set(key, value, EXPIRE_TIME_IN_MINUTES, TimeUnit.MINUTES); logger.debug("Put query result to redis"); } /** * Get cached query result from redis * * @param key * @return */ @Override public Object getObject(Object key) { RedisTemplate redisTemplate = getRedisTemplate(); ValueOperations opsForValue = redisTemplate.opsForValue(); logger.debug("Get cached query result from redis"); return opsForValue.get(key); } /** * Remove cached query result from redis * * @param key * @return */ @Override @SuppressWarnings("unchecked") public Object removeObject(Object key) { RedisTemplate redisTemplate = getRedisTemplate(); redisTemplate.delete(key); logger.debug("Remove cached query result from redis"); return null; } /** * Clears this cache instance */ @Override public void clear() { RedisTemplate redisTemplate = getRedisTemplate(); redisTemplate.execute((RedisCallback) connection -> { connection.flushDb(); return null; }); logger.debug("Clear all the cached query result from redis"); } @Override public int getSize() { return 0; } @Override public ReadWriteLock getReadWriteLock() { return readWriteLock; } private RedisTemplate getRedisTemplate() { if (redisTemplate == null) { redisTemplate = ApplicationContextHolder.getBean("redisTemplate"); } return redisTemplate; }}
5.在mapper.xml映射文件中开启缓存：
id, pass_word, user_name
细节提示：
1.mapper映射接口类要加上@mapper注解，将其添加入ioc容器：
import org.apache.ibatis.annotations.Mapper;import springbootd.demo.mybatisEntity.User;@Mapperpublic interface UserMapper { User selectByPrimaryKey(Long id);} 或者在springboot入口类加上@MapperScan(basePackages ="包路径")
@SpringBootApplication@MapperScan(basePackages ="springbootd.demo.mybatisDao")public class DemoApplication { public static void main(String[] args) { SpringApplication.run(DemoApplication.class, args); }}