redis与spring结合使用

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redis与spring结合使用，在 MethodInterceptor 里将请求参数为key，返回结果为value，通过约定的命名规则，将访问频繁的且对权限控制要求不高的请求“自动”接入redis。

比在具体方法里进行存取操作，工作量跟维护成本低很多。

public class MethodCacheInterceptor implements MethodInterceptor {     private RedisTemplate<Serializable, Object> redisTemplate;    private Long defaultCacheExpireTime = 10l; // 缓存默认的过期时间,这里设置了10秒     public Object invoke(MethodInvocation invocation) throws Throwable {        Object value = null;         String targetName = invocation.getThis().getClass().getName();        String methodName = invocation.getMethod().getName();         Object[] arguments = invocation.getArguments();        String key = getCacheKey(targetName, methodName, arguments);         try {            // 判断是否有缓存            if (exists(key)) {                return getCache(key);            }            // 写入缓存            value = invocation.proceed();            if (value != null) {                final String tkey = key;                final Object tvalue = value;                new Thread(new Runnable() {                    public void run() {                        setCache(tkey, tvalue, defaultCacheExpireTime);                    }                }).start();            }        } catch (Exception e) {            e.printStackTrace();            if (value == null) {                return invocation.proceed();            }        }        return value;    }     /**     * 创建缓存key     *     * @param targetName     * @param methodName     * @param arguments     */    private String getCacheKey(String targetName, String methodName,            Object[] arguments) {        StringBuffer sbu = new StringBuffer();        sbu.append(targetName).append("_").append(methodName);        if ((arguments != null) && (arguments.length != 0)) {            for (int i = 0; i < arguments.length; i++) {                sbu.append("_").append(arguments[i]);            }        }        return sbu.toString();    }     /**     * 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 getCache(final String key) {        Object result = null;        ValueOperations<Serializable, Object> operations = redisTemplate                .opsForValue();        result = operations.get(key);        return result;    }     /**     * 写入缓存     *     * @param key     * @param value     * @return     */    public boolean setCache(final String key, Object value, Long expireTime) {        boolean result = false;        try {            ValueOperations<Serializable, Object> operations = redisTemplate                    .opsForValue();            operations.set(key, value);            redisTemplate.expire(key, expireTime, TimeUnit.SECONDS);            result = true;        } catch (Exception e) {            e.printStackTrace();        }        return result;    }     public void setRedisTemplate(            RedisTemplate<Serializable, Object> redisTemplate) {        this.redisTemplate = redisTemplate;    }}

<!-- jedis 配置 -->    <bean id="poolConfig" class="redis.clients.jedis.JedisPoolConfig" >          <property name="maxIdle" value="${redis.maxIdle}" />          <property name="maxWaitMillis" value="${redis.maxWait}" />          <property name="testOnBorrow" value="${redis.testOnBorrow}" />    </bean >     <!-- redis服务器中心 -->    <bean id="connectionFactory"  class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory" >          <property name="poolConfig" ref="poolConfig" />          <property name="port" value="${redis.port}" />          <property name="hostName" value="${redis.host}" />          <!-- <property name="password" value="${redis.password}" /> -->          <property name="timeout" value="${redis.timeout}" ></property>    </bean >        <bean id="redisTemplate" class="org.springframework.data.redis.core.RedisTemplate" >          <property name="connectionFactory" ref="connectionFactory" />          <property name="keySerializer" >              <bean class="org.springframework.data.redis.serializer.StringRedisSerializer" />          </property>          <property name="valueSerializer" >              <bean class="org.springframework.data.redis.serializer.JdkSerializationRedisSerializer" />          </property>    </bean >     <!-- cache配置 -->    <bean id="methodCacheInterceptor" class="com.test.redis.interceptor.MethodCacheInterceptor" >          <property name="redisTemplate" ref="redisTemplate" />    </bean >     <!-- aop配置切点跟通知 -->    <bean id="methodCachePointCut" class="org.springframework.aop.support.RegexpMethodPointcutAdvisor">        <property name="advice" ref="methodCacheInterceptor"/>        <property name="pattern" value=".*ServiceImpl.*getTimestamp"/>    </bean>        <bean id="redisTestService" class="com.test.redis.RedisTestServiceImpl">    </bean>

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