redis 在spring boot工程中的应用（二）

http://wiselyman.iteye.com/blog/2184884 在spring boot 中加入redis换成的样例

http://www.tuicool.com/articles/qyEvYnR  Spring Boot使用redis做数据缓存
http://www.myexception.cn/other/1938770.html   Spring Boot使用redis作数据缓存

================  以上都是基于注解，不是自定义的，因此不能满足我目前工作的需求

http://www.tuicool.com/articles/BFFB7r   Spring+Jedis+Redis自定义模板实现缓存Object对象 ：这个已经提供一种自定义的方法了

接下来介绍一下Redis一种实现方法：

先在application.properties中写入如下配置

spring.redis.database=0spring.redis.host=172.16.22.21spring.redis.password= # Login password of the redis server.spring.redis.pool.max-active=3000spring.redis.pool.max-idle=1000spring.redis.pool.max-wait=1500spring.redis.pool.min-idle=0spring.redis.port=6379spring.redis.sentinel.master= # Name of Redis server.spring.redis.sentinel.nodes= # Comma-separated list of host:port pairs.spring.redis.timeout=0

在configure中写入一下配置信息

import java.lang.reflect.Method;import org.springframework.beans.factory.annotation.Value;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.jedis.JedisConnectionFactory;import org.springframework.data.redis.core.RedisTemplate;import org.springframework.data.redis.core.StringRedisTemplate;import org.springframework.data.redis.serializer.GenericToStringSerializer;import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;import org.springframework.data.redis.serializer.StringRedisSerializer;import com.fasterxml.jackson.annotation.JsonAutoDetect;import com.fasterxml.jackson.annotation.PropertyAccessor;import com.fasterxml.jackson.databind.ObjectMapper;@Configuration@EnableCachingpublic class CacheConfig extends CachingConfigurerSupport {  @Value("${spring.redis.host}")  private String host;  @Value("${spring.redis.port}")  private int port;  @Value("${spring.redis.timeout}")  private int timeout;    @Bean  public KeyGenerator wiselyKeyGenerator(){        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 JedisConnectionFactory() {      JedisConnectionFactory factory = new JedisConnectionFactory();      factory.setHostName(host);      factory.setPort(port);      factory.setTimeout(timeout); //设置连接超时时间      return factory;  }  //针对特定的类进行序列化缓存，定义对应的bean ============= 对于序列化会存在许多问题，我在第（三）中会慢慢做总结  @Bean(name="redisTemplateLocationMonitor")  public RedisTemplate<String, LocationMonitor> redisTemplateLocationMonitor() {  RedisTemplate<String, LocationMonitor> redisTemplate = new RedisTemplate<String, LocationMonitor>();  redisTemplate.setConnectionFactory(JedisConnectionFactory());  Jackson2JsonRedisSerializer<Object> jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer<Object>(Object.class);  ObjectMapper om = new ObjectMapper();       om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);       om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);       jackson2JsonRedisSerializer.setObjectMapper(om);       redisTemplate.setValueSerializer(jackson2JsonRedisSerializer);      redisTemplate.afterPropertiesSet();           redisTemplate.setKeySerializer(new StringRedisSerializer());     redisTemplate.setHashKeySerializer(new GenericToStringSerializer<Object>(Object.class));     return redisTemplate;  }  //这个函数是通用的，但是如果换成的类有多种，并且在一个service中要调用多种redisTemplate，就要写对应的Bean  @Bean(name="redisTemplate")  public RedisTemplate<Object, Object> redisTemplate() {  RedisTemplate<Object, Object> redisTemplate = new RedisTemplate<Object, Object>();  redisTemplate.setConnectionFactory(JedisConnectionFactory());  Jackson2JsonRedisSerializer<Object> jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer<Object>(Object.class);  ObjectMapper om = new ObjectMapper();       om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);       om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);       jackson2JsonRedisSerializer.setObjectMapper(om);       redisTemplate.setValueSerializer(jackson2JsonRedisSerializer);      redisTemplate.afterPropertiesSet();           redisTemplate.setKeySerializer(new StringRedisSerializer());     redisTemplate.setHashKeySerializer(new GenericToStringSerializer<Object>(Object.class));     return redisTemplate;  }    @Bean(name="cacheManager")  public CacheManager cacheManager() {    return new RedisCacheManager(redisTemplate());  }      public 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);  }  }

以下是对应的自定义缓存方法：先看接口

public interface LocationMonitorRedis  {/* * 持久化Redis中缓存的定位信息 */public void saveToPSQ();/* * 向Redis中缓存一条定位信息 */public void save(LocationMonitor locationMonitor);}

写实现函数

@Servicepublic class LocationMonitorRedisImpl implements LocationMonitorRedis {@Resourceprivate RedisTemplate<String, LocationMonitor> redisTemplate;private final LocationMonitorRepository locationMonitorRepository;@Autowiredpublic LocationMonitorRedisImpl(LocationMonitorRepository locationMonitorRepository) {this.locationMonitorRepository = locationMonitorRepository;}//把数据持久化（可以根据自己情况实现，这里用jpa）@Overridepublic void saveToPSQ() {String pattern = "bak.LocationMonitor.*"; //模式串Set<String> keys = redisTemplate.keys(pattern);//找出所有匹配的键List<LocationMonitor> lmList = new ArrayList<LocationMonitor>(); Iterator<String> it = keys.iterator();while(it.hasNext()){String key = it.next();LocationMonitor lm = redisTemplate.opsForValue().get(key);//取出所有对应的缓存类的数据lmList.add(lm);}locationMonitorRepository.save(lmList);//持久化redisTemplate.delete(keys);//删除键}@Overridepublic void save(LocationMonitor locationMonitor) {if(locationMonitor != null){Long now = System.currentTimeMillis();  String key = "bak.LocationMonitor."+locationMonitor.getId()+"."+now;  //构建键值redisTemplate.opsForValue().set(key, locationMonitor);key = "LocationMonitor."+locationMonitor.getCorrectionAll().getId();redisTemplate.opsForValue().set(key, locationMonitor);   //保存} else {System.out.println("传来的对象为空！！！");return ;}}}