本文共 10931 字,大约阅读时间需要 36 分钟。
1、引入jar包
2、在resources下创建redis.properties文件org.springframework.boot spring-boot-starter-redis org.springframework.session spring-session-data-redis
# REDIS (RedisProperties)# Redis数据库索引(默认为0)spring.redis.database=0spring.redis.host=localhostspring.redis.password=spring.redis.port=6379spring.redis.timeout=300spring.redis.maxIdle=8spring.redis.minIdle=0spring.redis.maxActive=8spring.redis.maxWait=-1#spring.redis.sentinel.master= # name of Redis server#spring.redis.sentinel.nodes= # comma-separated list of host:port pairs
3、创建RedisConfig,添加@EnableRedisHttpSession来开启spring session支持
package com.demo.redis;import com.demo.model.Redis;import com.fasterxml.jackson.annotation.JsonAutoDetect;import com.fasterxml.jackson.annotation.PropertyAccessor;import com.fasterxml.jackson.databind.ObjectMapper;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.beans.factory.annotation.Value;import org.springframework.boot.context.properties.ConfigurationProperties;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.connection.jedis.JedisConnectionFactory;import org.springframework.data.redis.core.RedisTemplate;import org.springframework.data.redis.core.StringRedisTemplate;import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;import org.springframework.session.data.redis.config.annotation.web.http.EnableRedisHttpSession;import java.lang.reflect.Method;/** * Created by huguoju on 2016/12/29. * 缓存管理(注解用) */@Configuration@EnableCaching@EnableRedisHttpSession //开启spring session支持 实现session共享public class RedisConfig extends CachingConfigurerSupport { @Autowired private Redis redis; private int expireTime = 60 * 60; /** * 生成key的策略 * @return */ @Bean public KeyGenerator keyGenerator() { 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(); } }; } @Bean public JedisConnectionFactory redisConnectionFactory() { JedisConnectionFactory factory = new JedisConnectionFactory(); factory.setHostName(redis.getHost()); factory.setPort(redis.getPort()); factory.setTimeout(redis.getTimeout()); //设置连接超时时间 return factory; } @Bean public CacheManager cacheManager(RedisTemplate redisTemplate) { RedisCacheManager cacheManager = new RedisCacheManager(redisTemplate); //Number of seconds before expiration. Defaults to unlimited (0) cacheManager.setDefaultExpiration(expireTime); //设置key-value超时时间 return cacheManager; //return new RedisCacheManager(redisTemplate); } @SuppressWarnings("unchecked") @Bean public RedisTemplate如果redis配置信息是放在application.properties里,可以直接用redisTemplate(RedisConnectionFactory factory) { StringRedisTemplate template = new StringRedisTemplate(factory); setSerializer(template); //设置序列化工具,这样ReportBean不需要实现Serializable接口 template.afterPropertiesSet(); return template; } private void setSerializer(StringRedisTemplate template) { 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); }}
@Value("${spring.redis.host}")private String host;
直接注入属性,我是将redis配置放在redis.properties里了,所以不能用@value了,
创建redis文件
package com.demo.model;import lombok.Data;import org.springframework.boot.context.properties.ConfigurationProperties;import org.springframework.context.annotation.Configuration;/** * Created by huguoju on 2016/12/29. */@Configuration@Data@ConfigurationProperties(prefix = "spring.redis",locations = "classpath:redis/redis.properties")public class Redis { private String database; private String host; private String password; private int port; private int timeout; private String maxIdle; private String minIdle; private String maxActive; private String maxWait;} 在redisConfig里通过
@Autowired private Redis redis;
调用就可以了。
4、测试,在testController中,
package com.demo.controller;import com.demo.model.User;import com.demo.service.TestService;import io.swagger.annotations.Api;import io.swagger.annotations.ApiOperation;import io.swagger.annotations.ApiParam;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.cache.annotation.Cacheable;import org.springframework.http.MediaType;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.*;import java.util.HashMap;import java.util.Map;/** * Created by huguoju on 2016/12/28. */@RestController@RequestMapping("test")@Api(value = "测试类",tags = "测试接口")public class TestController { /** * @Cacheable(key = "'user:'.concat(#userCode)",value = "user") * value的意思是当调用这个方法的时候,会从一个名叫 user 的缓存中查询,如果没有,则执行实际的方法(即查询数据库),并将执行的结果存入缓存中,否则返回缓存中的对象 */ @Autowired private TestService testService; @RequestMapping(value = "testData",produces = MediaType.APPLICATION_JSON_UTF8_VALUE,method = {RequestMethod.POST,RequestMethod.GET}) @ApiOperation("测试读写分离、缓存") @Cacheable(key = "'user:'.concat(#userCode)",value = "user") public User testDateSource( @ApiParam(name = "userCode",value = "用户id",required = true) @RequestParam Integer userCode){ User user=testService.selectByUserCode(userCode); return user; }} @Cacheable 的作用 主要针对方法配置,能够根据方法的请求参数对其结果进行缓存
@Cacheable 作用和配置方法 参数 解释 example value 缓存的名称,在 spring 配置文件中定义,必须指定至少一个 例如: @Cacheable(value=”mycache”) @Cacheable(value={”cache1”,”cache2”} key 缓存的 key,可以为空,如果指定要按照 SpEL 表达式编写,如果不指定,则缺省按照方法的所有参数进行组合 @Cacheable(value=”testcache”,key=”#userName”) condition 缓存的条件,可以为空,使用 SpEL 编写,返回 true 或者 false,只有为 true 才进行缓存 @Cacheable(value=”testcache”,condition=”#userName.length()>2”)
@CachePut 的作用 主要针对方法配置,能够根据方法的请求参数对其结果进行缓存,和 @Cacheable 不同的是,它每次都会触发真实方法的调用 @CachePut 作用和配置方法 参数 解释 example value 缓存的名称,在 spring 配置文件中定义,必须指定至少一个 @CachePut(value=”my cache”) key 缓存的 key,可以为空,如果指定要按照 SpEL 表达式编写,如果不指定,则缺省按照方法的所有参数进行组合 @CachePut(value=”testcache”,key=”#userName”) condition 缓存的条件,可以为空,使用 SpEL 编写,返回 true 或者 false,只有为 true 才进行缓存 @CachePut(value=”testcache”,condition=”#userName.length()>2”)
@CacheEvict @CachEvict 的作用 主要针对方法配置,能够根据一定的条件对缓存进行清空 @CacheEvict 作用和配置方法 参数 解释 example value 缓存的名称,在 spring 配置文件中定义,必须指定至少一个 @CacheEvict(value=”my cache”) key 缓存的 key,可以为空,如果指定要按照 SpEL 表达式编写,如果不指定,则缺省按照方法的所有参数进行组合 @CacheEvict(value=”testcache”,key=”#userName”) condition 缓存的条件,可以为空,使用 SpEL 编写,返回 true 或者 false,只有为 true 才进行缓存 @CacheEvict(value=”testcache”,condition=”#userName.length()>2”) allEntries 是否清空所有缓存内容,缺省为 false,如果指定为 true,则方法调用后将立即清空所有缓存 @CachEvict(value=”testcache”,allEntries=true) beforeInvocation 是否在方法执行前就清空,缺省为 false,如果指定为 true,则在方法还没有执行的时候就清空缓存,缺省情况下,如果方法执行抛出异常,则不会清空缓存 @CachEvict(value=”testcache”,beforeInvocation=true)
@Caching:多个不同的需求放在同一个方法上,就用Caching,比如清除多个缓存
@Caching(evict = { @CacheEvict(value="test1", key="#id",beforeInvocation = true), @CacheEvict(value="test2", key="#id",beforeInvocation = true)})
Caching源代码如下:
ps:redisUtil:
package com.example.util;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.data.redis.core.RedisTemplate;import org.springframework.data.redis.core.ValueOperations;import org.springframework.stereotype.Component;import java.io.Serializable;import java.util.Set;import java.util.concurrent.TimeUnit;/** * Created by huguoju on 2016/12/30. */@SuppressWarnings("unchecked")@Componentpublic class RedisUtils { @SuppressWarnings("rawtypes") @Autowired private RedisTemplate redisTemplate; /** * 批量删除对应的value * * @param keys */ public void remove(final String... keys) { for (String key : keys) { remove(key); } } /** * 批量删除key * * @param pattern */ public void removePattern(final String pattern) { Setkeys = redisTemplate.keys(pattern); if (keys.size() > 0) redisTemplate.delete(keys); } /** * 删除对应的value * * @param key */ public void remove(final String key) { if (exists(key)) { redisTemplate.delete(key); } } /** * 判断缓存中是否有对应的value * * @param key * @return */ public boolean exists(final String key) { return redisTemplate.hasKey(key); } /** * 读取缓存 * * @param key * @return */ public Object get(final String key) { Object result = null; ValueOperations operations = redisTemplate.opsForValue(); result = operations.get(key); return result; } /** * 写入缓存 * * @param key * @param value * @return */ public boolean set(final String key, Object value) { boolean result = false; try { ValueOperations operations = redisTemplate.opsForValue(); operations.set(key, value); result = true; } catch (Exception e) { e.printStackTrace(); } return result; } /** * 写入缓存 * * @param key * @param value * @return */ public boolean set(final String key, Object value, Long expireTime) { boolean result = false; try { ValueOperations operations = redisTemplate.opsForValue(); operations.set(key, value); redisTemplate.expire(key, expireTime, TimeUnit.SECONDS); result = true; } catch (Exception e) { e.printStackTrace(); } return result; }}
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