java aop redis缓存

<!-- Redis客户端 --><dependency><groupId>redis.clients</groupId><artifactId>jedis</artifactId><version>2.8.0</version></dependency>        <!-- Jackson Json处理工具包 --><dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-databind</artifactId><version>2.7.3</version></dependency>

spring 配置文件添加

  <!-- 开启切面代理 使得spring认识 @Aspect -->     <aop:aspectj-autoproxy/>

然后定义两个标注在Service实现方法上的注解，用于传递类型参数：

import java.lang.annotation.Documented;import java.lang.annotation.ElementType;import java.lang.annotation.Retention;import java.lang.annotation.RetentionPolicy;import java.lang.annotation.Target;@Retention(RetentionPolicy.RUNTIME)@Target(ElementType.METHOD)@Documentedpublic @interface RedisCache {    Class type();    public int expire() default 0;      //缓存多少秒,默认无限期  }

import java.lang.annotation.ElementType;import java.lang.annotation.Retention;import java.lang.annotation.RetentionPolicy;import java.lang.annotation.Target;@Retention(RetentionPolicy.RUNTIME)@Target(ElementType.METHOD)public @interface RedisEvict {    Class type();}

注解的使用方式如下：

@RedisCache(type = User.class, expire = 200000000)public List<User> findUsersByGroupId(Integer group_id) {return groupDao.findUsersByGroupId(group_id);}

@RedisEvict(type = User.class)// 表示该方法需要执行清除缓存逻辑public void updateUserByPhone(String nickName,String phone) {UserDao.updateUserByPhone(nickName, phone);}

JsonUtils

import java.io.IOException;import java.util.HashMap;import java.util.List;import java.util.Map;import java.util.Map.Entry;import org.apache.log4j.Logger;import com.fasterxml.jackson.core.type.TypeReference;import com.fasterxml.jackson.databind.JavaType;import com.fasterxml.jackson.databind.ObjectMapper;public class JsonUtils {private static Logger logger = Logger.getLogger(JsonUtils.class);// 定义jackson对象private static final ObjectMapper MAPPER = new ObjectMapper();/** * 将对象转换成json字符串。 *  * @param data * @return * @throws IOException */public static String objectToJson(Object data) {try {String string = MAPPER.writeValueAsString(data);return string;} catch (Exception e) {e.printStackTrace();}return null;}/** * 将json结果集转化为对象 *  * @param jsonData *            json数据 * @param clazz *            对象中的object类型 * @return */public static <T> T jsonToPojo(String jsonData, Class<T> beanType) {try {T t = MAPPER.readValue(jsonData, beanType);return t;} catch (Exception e) {e.printStackTrace();}return null;}/** * 将json数据转换成pojo对象list *  * @param jsonData * @param beanType * @return */public static <T> List<T> jsonToList(String jsonData, Class<T> beanType) {JavaType javaType = MAPPER.getTypeFactory().constructParametricType(List.class, beanType);try {List<T> list = MAPPER.readValue(jsonData, javaType);return list;} catch (Exception e) {e.printStackTrace();}return null;}/** * json string convert to map with javaBean */public static <T> Map<String, T> jsonTomap(String jsonStr, Class<T> clazz)throws Exception {Map<String, Map<String, Object>> map = MAPPER.readValue(jsonStr,new TypeReference<Map<String, T>>() {});Map<String, T> result = new HashMap<String, T>();for (Entry<String, Map<String, Object>> entry : map.entrySet()) {result.put(entry.getKey(), mapTopojo(entry.getValue(), clazz));}return result;}/** * json string convert to map */public static <T> Map<String, Object> jsonTomap(String jsonStr) {try {return MAPPER.readValue(jsonStr, Map.class);} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}return null;}/** * map convert to javaBean */public static <T> T mapTopojo(Map map, Class<T> clazz) {try {return MAPPER.convertValue(map, clazz);} catch (Exception e) {e.printStackTrace();}return null;}}

AOP的代码如下:

import java.util.List;import org.aspectj.lang.JoinPoint;import org.aspectj.lang.ProceedingJoinPoint;import org.aspectj.lang.annotation.Around;import org.aspectj.lang.annotation.Aspect;import org.aspectj.lang.annotation.Before;import org.aspectj.lang.reflect.MethodSignature;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Component;import com.core.annotation.RedisCache;import com.core.annotation.RedisEvict;import com.jedis.dao.JedisClient;import com.utils.JsonUtils;@Aspect@Componentpublic class CacheInterceptor {@AutowiredJedisClient jedisClient;//前置由于数据库数据变更  清理redis缓存@Before("@annotation(redisEvict)")public void <span style="font-family:Consolas, Courier New, Courier, mono, serif;"><span style="line-height: 18px; background-color: rgb(248, 248, 248);">doBefore</span></span>(JoinPoint jp,RedisEvict redisEvict){  try{    String modelName = redisEvict.type().getName();  // 清除对应缓存  jedisClient.del(modelName);      }catch (Exception e) {e.printStackTrace();System.out.println("缓存服务器出现问题,发邮箱，发信息...");}}// 配置环绕方法@Around("@annotation(redisCache)")public Object doAround(ProceedingJoinPoint pjp, RedisCache redisCache)throws Throwable {// 得到被代理的方法// Method me = ((MethodSignature) pjp.getSignature()).getMethod();// Class modelType = me.getAnnotation(RedisCache.class).type();//得到注解上类型Class modelType = redisCache.type();//System.out.println(modelType.getName());// 去Redis中看看有没有我们的数据 包名+ 类名 + 方法名 + 参数(多个)String cacheKey = getCacheKey(pjp);System.out.println(cacheKey);String value = null;try {//当取redis发生异常时，为了不影响程序正常执行，需要try..catch()...//检查redis中是否有缓存        value = jedisClient.hget(modelType.getName(),cacheKey);} catch (Exception e) {e.printStackTrace();System.out.println("缓存服务器出现问题,发邮箱，发信息...");}// result是方法的最终返回结果Object result = null;if (null == value) {// 缓存未命中System.out.println("缓存未命中");// 后端查询数据  result = pjp.proceed();           try {//当取redis发生异常时，为了不影响程序正常执行，需要try..catch()...// 序列化结果放入缓存String json = serialize(result);jedisClient.hset(modelType.getName(), cacheKey, json);if(redisCache.expire()>0) { jedisClient.expire(cacheKey, redisCache.expire());//设置缓存时间}} catch (Exception e) {e.printStackTrace();System.out.println("缓存服务器出现问题,发邮箱，发信息...");}} else {try{//当数据转换失败发生异常时，为了不影响程序正常执行，需要try..catch()...// int i =1/0;// 得到被代理方法的返回值类型Class returnType = ((MethodSignature) pjp.getSignature()).getReturnType();//把json反序列化result = deserialize(value, returnType, modelType);    // 缓存命中System.out.println("缓存命中");} catch (Exception e) {//数据转换失败，到后端查询数据  result = pjp.proceed();e.printStackTrace();System.out.println("缓存命中,但数据转换失败...");}}return result;}protected String serialize(Object target) {return JsonUtils.objectToJson(target);}protected Object deserialize(String jsonString, Class clazz, Class modelType) {// 序列化结果应该是List对象if (clazz.isAssignableFrom(List.class)) {return JsonUtils.jsonToList(jsonString, modelType);}// 序列化结果是普通对象return JsonUtils.jsonToPojo(jsonString, clazz);}// 包名+ 类名 + 方法名 + 参数(多个) 生成Keypublic String getCacheKey(ProceedingJoinPoint pjp) {StringBuffer key = new StringBuffer();// 包名+ 类名 cn.core.serice.product.ProductServiceImpl.productListString packageName = pjp.getTarget().getClass().getName();key.append(packageName);// 方法名String methodName = pjp.getSignature().getName();key.append(".").append(methodName);// 参数(多个)Object[] args = pjp.getArgs();for (Object arg : args) {// 参数key.append(".").append(arg.toString());}return key.toString();}}

jedisClient.java

public interface JedisClient {String get(String key);byte[] get(byte[] key);String set(String key, String value);String set(byte[] key, byte[] value);String hget(String hkey, String key);long hset(String hkey, String key, String value);long incr(String key);long expire(String key, int second);long ttl(String key);long del(String key);long hdel(String hkey, String key);}

JedisClientSingle 

import org.springframework.beans.factory.annotation.Autowired;import redis.clients.jedis.Jedis;import redis.clients.jedis.JedisPool;import com.edl.jedis.dao.JedisClient;public class JedisClientSingle implements JedisClient{@Autowiredprivate JedisPool jedisPool; @Overridepublic String get(String key) {Jedis jedis = jedisPool.getResource();String string = jedis.get(key);jedis.close();return string;}@Overridepublic String set(String key, String value) {Jedis jedis = jedisPool.getResource();String string = jedis.set(key, value);jedis.close();return string;}@Overridepublic String hget(String hkey, String key) {Jedis jedis = jedisPool.getResource();String string = jedis.hget(hkey, key);jedis.close();return string;}@Overridepublic long hset(String hkey, String key, String value) {Jedis jedis = jedisPool.getResource();Long result = jedis.hset(hkey, key, value);jedis.close();return result;}@Overridepublic long incr(String key) {Jedis jedis = jedisPool.getResource();Long result = jedis.incr(key);jedis.close();return result;}@Overridepublic long expire(String key, int second) {Jedis jedis = jedisPool.getResource();Long result = jedis.expire(key, second);jedis.close();return result;}@Overridepublic long ttl(String key) {Jedis jedis = jedisPool.getResource();Long result = jedis.ttl(key);jedis.close();return result;}@Overridepublic long del(String key) {Jedis jedis = jedisPool.getResource();Long result = jedis.del(key);jedis.close();return result;}@Overridepublic long hdel(String hkey, String key) {Jedis jedis = jedisPool.getResource();Long result = jedis.hdel(hkey, key);jedis.close();return result;}@Overridepublic byte[] get(byte[] key) {Jedis jedis = jedisPool.getResource();byte[] result = jedis.get(key);jedis.close();return result;}@Overridepublic String set(byte[] key, byte[] value) {Jedis jedis = jedisPool.getResource();String result = jedis.set(key, value);jedis.close();return result;}}

JedisClientCluster

public class JedisClientCluster implements JedisClient {@Autowiredprivate JedisCluster jedisCluster;@Overridepublic String get(String key) {return jedisCluster.get(key);}@Overridepublic String set(String key, String value) {return jedisCluster.set(key, value);}@Overridepublic String hget(String hkey, String key) {return jedisCluster.hget(hkey, key);}@Overridepublic long hset(String hkey, String key, String value) {return jedisCluster.hset(hkey, key, value);}@Overridepublic long incr(String key) {return jedisCluster.incr(key);}@Overridepublic long expire(String key, int second) {return jedisCluster.expire(key, second);}@Overridepublic long ttl(String key) {return jedisCluster.ttl(key);}@Overridepublic long del(String key) {return jedisCluster.del(key);}@Overridepublic long hdel(String hkey, String key) {return jedisCluster.hdel(hkey, key);}@Overridepublic byte[] get(byte[] key) {// TODO Auto-generated method stubreturn jedisCluster.get(key);}@Overridepublic String set(byte[] key, byte[] value) {// TODO Auto-generated method stubreturn jedisCluster.set(key, value);}}

spring-jedis.xml

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:task="http://www.springframework.org/schema/task"xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsdhttp://www.springframework.org/schema/beans                    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd                    http://www.springframework.org/schema/context                    http://www.springframework.org/schema/context/spring-context-3.0.xsd                    http://www.springframework.org/schema/aop                    http://www.springframework.org/schema/aop/spring-aop-3.0.xsd                    http://www.springframework.org/schema/tx                    http://www.springframework.org/schema/tx/spring-tx-3.0.xsd                    http://www.springframework.org/schema/task                    http://www.springframework.org/schema/task/spring-task-3.0.xsd"> <context:component-scan base-package="com.core" /><!-- jedis客户端单机版 --><bean id="redisClient" class="redis.clients.jedis.JedisPool"><constructor-arg name="host" value="192.168.1.87"></constructor-arg><constructor-arg name="port" value="6379"></constructor-arg></bean><bean id="jedisClient" class="com.edl.jedis.dao.impl.JedisClientSingle" /><!-- jedis集群版配置 --><!-- <bean id="redisClient" class="redis.clients.jedis.JedisCluster"><constructor-arg name="nodes"><set>    <bean class="redis.clients.jedis.HostAndPort"><constructor-arg name="host" value="192.168.1.87"></constructor-arg><constructor-arg name="port" value="7006"></constructor-arg></bean><bean class="redis.clients.jedis.HostAndPort"><constructor-arg name="host" value="192.168.1.87"></constructor-arg><constructor-arg name="port" value="7001"></constructor-arg></bean><bean class="redis.clients.jedis.HostAndPort"><constructor-arg name="host" value="192.168.1.87"></constructor-arg><constructor-arg name="port" value="7002"></constructor-arg></bean><bean class="redis.clients.jedis.HostAndPort"><constructor-arg name="host" value="192.168.1.87"></constructor-arg><constructor-arg name="port" value="7003"></constructor-arg></bean><bean class="redis.clients.jedis.HostAndPort"><constructor-arg name="host" value="192.168.1.87"></constructor-arg><constructor-arg name="port" value="7004"></constructor-arg></bean><bean class="redis.clients.jedis.HostAndPort"><constructor-arg name="host" value="192.168.1.87"></constructor-arg><constructor-arg name="port" value="7005"></constructor-arg></bean></set></constructor-arg><constructor-arg name="poolConfig" ref="jedisPoolConfig"></constructor-arg></bean><bean id="jedisClientCluster" class="com.edl.jedis.dao.impl.JedisClientCluster"></bean> --></beans>