package com.shanhy.example.redis;

import java.util.HashMap;
import java.util.Map;

import javax.annotation.PostConstruct;

import org.springframework.stereotype.Component;

/**
 * 方法缓存key常量
 * 
 * @author SHANHY
 */
@Component
public class RedisKeys {

  // 测试 begin
  public static final String _CACHE_TEST = "_cache_test";// 缓存key
  public static final Long _CACHE_TEST_SECOND = 20L;// 缓存时间
  // 测试 end

  // 根据key设定具体的缓存时间
  private Map<String, Long> expiresMap = null;

  @PostConstruct
  public void init(){
    expiresMap = new HashMap<>();
    expiresMap.put(_CACHE_TEST, _CACHE_TEST_SECOND);
  }

  public Map<String, Long> getExpiresMap(){
    return this.expiresMap;
  }
}

package com.shanhy.example.redis;

import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;

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.cache.interceptor.SimpleKeyGenerator;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.cache.RedisCacheManager;
import org.springframework.data.redis.core.RedisTemplate;

/**
 * 注解式环境管理
 * 
 * @author 单红宇(CSDN catoop)
 * @create 2016年9月12日
 */
@Configuration
@EnableCaching
public class CachingConfig extends CachingConfigurerSupport {

  /**
   * 在使用@Cacheable时，如果不指定key，则使用找个默认的key生成器生成的key
   *
   * @return
   * 
   * @author 单红宇(CSDN CATOOP)
   * @create 2017年3月11日
   */
  @Override
  public KeyGenerator keyGenerator() {
    return new SimpleKeyGenerator() {

      /**
       * 对参数进行拼接后MD5
       */
      @Override
      public Object generate(Object target, Method method, Object... params) {
        StringBuilder sb = new StringBuilder();
        sb.append(target.getClass().getName());
        sb.append(".").append(method.getName());

        StringBuilder paramsSb = new StringBuilder();
        for (Object param : params) {
          // 如果不指定，默认生成包含到键值中
          if (param != null) {
            paramsSb.append(param.toString());
          }
        }

        if (paramsSb.length() > 0) {
          sb.append("_").append(paramsSb);
        }
        return sb.toString();
      }

    };

  }

  /**
   * 管理缓存
   *
   * @param redisTemplate
   * @return
   */
  @Bean
  public CacheManager cacheManager(RedisTemplate<String, Object> redisTemplate, RedisKeys redisKeys) {
    RedisCacheManager rcm = new RedisCacheManager(redisTemplate);
    // 设置缓存默认过期时间（全局的）
    rcm.setDefaultExpiration(1800);// 30分钟

    // 根据key设定具体的缓存时间，key统一放在常量类RedisKeys中
    rcm.setExpires(redisKeys.getExpiresMap());

    List<String> cacheNames = new ArrayList<String>(redisKeys.getExpiresMap().keySet());
    rcm.setCacheNames(cacheNames);

    return rcm;
  }

}

package com.shanhy.example.service;

import org.apache.commons.lang3.RandomStringUtils;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.stereotype.Service;

import com.shanhy.example.redis.RedisKeys;

@Service
public class TestService {

  /**
   * 固定key
   *
   * @return
   * @author SHANHY
   * @create 2017年4月9日
   */
  @Cacheable(value = RedisKeys._CACHE_TEST, key = "'" + RedisKeys._CACHE_TEST + "'")
  public String testCache() {
    return RandomStringUtils.randomNumeric(4);
  }

  /**
   * 存储在Redis中的key自动生成，生成规则详见CachingConfig.keyGenerator()方法
   *
   * @param str1
   * @param str2
   * @return
   * @author SHANHY
   * @create 2017年4月9日
   */
  @Cacheable(value = RedisKeys._CACHE_TEST)
  public String testCache2(String str1, String str2) {
    return RandomStringUtils.randomNumeric(4);
  }
}

package com.shanhy.example.controller;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.connection.jedis.RedisClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.shanhy.example.service.TestService;

/**
 * 测试Controller
 * 
 * @author 单红宇(365384722)
 * @create 2017年4月9日
 */
@RestController
@RequestMapping("/test")
public class TestController {

  private static final Logger LOG = LoggerFactory.getLogger(TestController.class);

  @Autowired
  private RedisClient redisClient;

  @Autowired
  private TestService testService;

  @GetMapping("/redisCache")
  public String redisCache() {
    redisClient.set("shanhy", "hello,shanhy", 100);
    LOG.info("getRedisValue = {}", redisClient.get("shanhy"));
    testService.testCache2("aaa", "bbb");
    return testService.testCache();
  }
}