Java中關於SSM之整合Redis的詳解

Redis安裝與使用

第一步當然是安裝Redis，這裡以Windows上的安裝為例。

先下載Redis,可以選擇msi或zip套件安裝方式
zip方式需開啟cmd窗口，在解壓縮後的目錄下執行redis-server redis.windows.conf啟動Redis
#採用msi方式安裝後Redis預設啟動，不需要進行任何設定
可以在redis.windows.conf檔案中修改Redis連接埠號碼、密碼等配置，修改完成後使用redis-server redis.windows.conf指令重新啟動
在Redis安裝目錄下執行redis-cli -h 127.0.0.1 -p 6379 -a 密碼開啟Redis操作介面
如果報錯(error) ERR operation not permitted，使用auth 密碼進行驗證

##SSM整合Redis

這裡直接在上一篇SSM之框架整合的基礎上進行Redis整合，

這裡要注意，存入Redis的pojo類別必須實作Serializable介面 。

設定pom.xml引入Redis依賴

<!--redis--><dependency>
    <groupId>org.springframework.data</groupId>
    <artifactId>spring-data-redis</artifactId>
    <version>1.6.1.RELEASE</version></dependency><dependency>
    <groupId>redis.clients</groupId>
    <artifactId>jedis</artifactId>
    <version>2.7.3</version></dependency>

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redis.properties##
redis.host=127.0.0.1 redis.port=6379 redis.password=redis redis.maxIdle=100 redis.maxWait=1000 redis.testOnBorrow=true redis.timeout=100000 defaultCacheExpireTime=3600
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applicationContext-redis.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:mvc="http://www.springframework.org/schema/mvc"       
xmlns:context="http://www.springframework.org/schema/context"       
xmlns:aop="http://www.springframework.org/schema/aop"       
xmlns:tx="http://www.springframework.org/schema/tx"       
xsi:schemaLocation="http://www.springframework.org/schema/beans        
http://www.springframework.org/schema/beans/spring-beans.xsd        
http://www.springframework.org/schema/mvc        
http://www.springframework.org/schema/mvc/spring-mvc.xsd        
http://www.springframework.org/schema/context        
http://www.springframework.org/schema/context/spring-context.xsd        
http://www.springframework.org/schema/aop        
http://www.springframework.org/schema/aop/spring-aop.xsd        
http://www.springframework.org/schema/tx        
http://www.springframework.org/schema/tx/spring-tx.xsd">

    <!--引入Redis配置文件-->
    <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="locations">
            <list>
                <value>classpath:redis.properties</value>
            </list>
        </property>
    </bean>

    <!-- jedis 连接池配置 -->
    <bean id="poolConfig" class="redis.clients.jedis.JedisPoolConfig">
        <property name="maxIdle" value="${redis.maxIdle}"/>
        <property name="maxWaitMillis" value="${redis.maxWait}"/>
        <property name="testOnBorrow" value="${redis.testOnBorrow}"/>
    </bean>
    <!-- redis连接工厂 -->
    <bean id="connectionFactory" class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory">
        <property name="poolConfig" ref="poolConfig"/>
        <property name="port" value="${redis.port}"/>
        <property name="hostName" value="${redis.host}"/>
        <property name="password" value="${redis.password}"/>
        <property name="timeout" value="${redis.timeout}"></property>
    </bean>
    <bean id="redisTemplate" class="org.springframework.data.redis.core.RedisTemplate">
        <property name="connectionFactory" ref="connectionFactory"/>
        <property name="keySerializer">
            <bean class="org.springframework.data.redis.serializer.StringRedisSerializer"/>
        </property>
        <property name="valueSerializer">
            <bean class="org.springframework.data.redis.serializer.JdkSerializationRedisSerializer"/>
        </property>
    </bean>
    <!-- 缓存拦截器配置 -->
    <bean id="methodCacheInterceptor" class="com.zkh.interceptor.MethodCacheInterceptor">
        <property name="redisUtil" ref="redisUtil"/>
        <property name="defaultCacheExpireTime" value="${defaultCacheExpireTime}"/>
        <!-- 禁用缓存的类名列表 -->
        <property name="targetNamesList">
            <list>
                <value></value>
            </list>
        </property>
        <!-- 禁用缓存的方法名列表 -->
        <property name="methodNamesList">
            <list>
                <value></value>
            </list>
        </property>
    </bean>
    <bean id="redisUtil" class="com.zkh.util.RedisUtil">
        <property name="redisTemplate" ref="redisTemplate"/>
    </bean>
    <!--配置切面拦截方法 -->
    <aop:config proxy-target-class="true">
        <aop:pointcut id="controllerMethodPointcut" expression="        
        execution(* com.zkh.service.impl.*.select*(..))"/>
        <aop:advisor advice-ref="methodCacheInterceptor" pointcut-ref="controllerMethodPointcut"/>
    </aop:config></beans>

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MethodCacheInterceptor.java

package com.zkh.interceptor;
import com.zkh.util.RedisUtil;
import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
import java.util.List;
/** 
* Redis缓存过滤器 
*/
public class MethodCacheInterceptor implements MethodInterceptor {    
private RedisUtil redisUtil;    
private List<String> targetNamesList; // 禁用缓存的类名列表
    private List<String> methodNamesList; // 禁用缓存的方法列表
    private String defaultCacheExpireTime; // 缓存默认的过期时间

    @Override
    public Object invoke(MethodInvocation invocation) throws Throwable {
        Object value = null;

        String targetName = invocation.getThis().getClass().getName();
        String methodName = invocation.getMethod().getName();        
        if (!isAddCache(targetName, methodName)) {            
        // 跳过缓存返回结果
            return invocation.proceed();
        }
        Object[] arguments = invocation.getArguments();
        String key = getCacheKey(targetName, methodName, arguments);        
        try {            // 判断是否有缓存
            if (redisUtil.exists(key)) {                
            return redisUtil.get(key);
            }            // 写入缓存
            value = invocation.proceed();            
            if (value != null) {                
            final String tkey = key;                
            final Object tvalue = value;                
            new Thread(new Runnable() {                    
            @Override
                    public void run() {
                        redisUtil.set(tkey, tvalue, Long.parseLong(defaultCacheExpireTime));
                    }
                }).start();
            }
        } catch (Exception e) {
            e.printStackTrace();            
            if (value == null) {                
            return invocation.proceed();
            }
        }        return value;
    }    
    /**     
    * 是否加入缓存     
    *     
    * @return     
    */
    private boolean isAddCache(String targetName, String methodName) {        
    boolean flag = true;        
    if (targetNamesList.contains(targetName)
                || methodNamesList.contains(methodName) || targetName.contains("$$EnhancerBySpringCGLIB$$")) {
            flag = false;
        }        return flag;
    }    
    /**     
    
    * 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();
    }    public void setRedisUtil(RedisUtil redisUtil) {        
    this.redisUtil = redisUtil;
    }    public void setTargetNamesList(List<String> targetNamesList) {        
    this.targetNamesList = targetNamesList;
    }    public void setMethodNamesList(List<String> methodNamesList) {        
    this.methodNamesList = methodNamesList;
    }    public void setDefaultCacheExpireTime(String defaultCacheExpireTime) {        
    
    this.defaultCacheExpireTime = defaultCacheExpireTime;
    }
}

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RedisUtil.java 工具類別

package com.zkh.util;import org.apache.log4j.Logger;import org.springframework.data.redis.core.RedisTemplate;import org.springframework.data.redis.core.ValueOperations;import java.io.Serializable;import java.util.Set;import java.util.concurrent.TimeUnit;/** * Redis工具类 */public class RedisUtil { private RedisTemplate<Serializable, Object> 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) { Set<Serializable> keys = 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<Serializable, Object> 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<Serializable, Object> 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<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; } }
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#效果顯示

剛開始Redis中沒有任何記錄，接下來訪問第一頁記錄

#再查看緩存，記錄已經存如Redis，並且第一次訪問會從Mysql讀取資料

按
F5
重新整理頁面，可以從Tomcat控制台可以看到沒有進行SQL查詢，而是直接從Redis讀取快取數據，減輕了資料庫的負擔

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