详解SSH框架和Redis的整合

2020-10-28 21:37:25

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一个已有的Struts+Spring+Hibernate项目，以前使用MySQL数据库，现在想把Redis也整合进去。

1. 相关Jar文件

下载并导入以下3个Jar文件：

commons-pool2-2.4.2.jar、jedis-2.3.1.jar、spring-data-redis-1.3.4.RELEASE.jar。

2. Redis配置文件

在src文件夹下面新建一个redis.properties文件，设置连接Redis的一些属性。

redis.host=127.0.0.1 redis.port=6379 redis.default.db=1 redis.timeout=100000 redis.maxActive=300 redis.maxIdle=100 redis.maxWait=1000 redis.testOnBorrow=true

再新建一个redis.xml文件。

<?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:p="http://www.springframework.org/schema/p"  xmlns:context="http://www.springframework.org/schema/context"  xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd  http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">   <context:property-placeholder location="classpath:redis.properties"/>   <bean id="propertyConfigurerRedis"   class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">   <property name="order" value="1" />   <property name="ignoreUnresolvablePlaceholders" value="true" />   <property name="systemPropertiesMode" value="1" />   <property name="searchSystemEnvironment" value="true" />   <property name="locations">   <list>    <value>classpath:redis.properties</value>   </list>   </property>  </bean>  <bean id="jedisPoolConfig"   class="redis.clients.jedis.JedisPoolConfig">   <property name="maxIdle" value="${redis.maxIdle}" />   <property name="testOnBorrow" value="${redis.testOnBorrow}" />  </bean>   <bean id="jedisConnectionFactory"   class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory">   <property name="usePool" value="true"></property>   <property name="hostName" value="${redis.host}" />   <property name="port" value="${redis.port}" />   <property name="timeout" value="${redis.timeout}" />   <property name="database" value="${redis.default.db}"></property>   <constructor-arg index="0" ref="jedisPoolConfig" />  </bean>  <bean id="redisTemplate"   class="org.springframework.data.redis.core.StringRedisTemplate"   p:connectionFactory-ref="jedisConnectionFactory"  >  </bean>   <bean id="redisBase" abstract="true">   <property name="template" ref="redisTemplate"/>  </bean>   <context:component-scan base-package="com.school.redisclient" /> </beans>

3. Redis类

新建一个com.school.redisclient包，结构如下：

接口IRedisService：

public interface IRedisService<K, V> {   public void set(K key, V value, long expiredTime);  public V get(K key); public Object getHash(K key, String name); public void del(K key);   }

抽象类AbstractRedisService，主要是对RedisTemplate进行操作：

public abstract class AbstractRedisService<K, V> implements IRedisService<K, V> {   @Autowired   private RedisTemplate<K, V> redisTemplate;     public RedisTemplate<K, V> getRedisTemplate() {    return redisTemplate;   }     public void setRedisTemplate(RedisTemplate<K, V> redisTemplate) {    this.redisTemplate = redisTemplate;   }     @Override   public void set(final K key, final V value, final long expiredTime) {    BoundValueOperations<K, V> valueOper = redisTemplate.boundValueOps(key);    if (expiredTime <= 0) {     valueOper.set(value);    } else {     valueOper.set(value, expiredTime, TimeUnit.MILLISECONDS);    }   }   @Override   public V get(final K key) {    BoundValueOperations<K, V> valueOper = redisTemplate.boundValueOps(key);    return valueOper.get();   }   @Override   public Object getHash(K key, String name){   Object res = redisTemplate.boundHashOps(key).get(name);   return res;  }    @Override   public void del(K key) {    if (redisTemplate.hasKey(key)) {     redisTemplate.delete(key);    }   }    }

实现类RedisService：

@Service("redisService") public class RedisService extends AbstractRedisService<String, String> {  }

工具类RedisTool：

public class RedisTool {  private static ApplicationContext factory; private static RedisService redisService;  public static ApplicationContext getFactory(){  if (factory == null){   factory = new ClassPathXmlApplicationContext("classpath:redis.xml");  }  return factory; }  public static RedisService getRedisService(){  if (redisService == null){   redisService = (RedisService) getFactory().getBean("redisService");  }    return redisService; }}

4. 查询功能的实现

新建一个Action：RClasQueryAction，返回Redis里面所有的课程数据。

@SuppressWarnings("serial")public class RClasQueryAction extends ActionSupport {  RedisService rs = RedisTool.getRedisService(); List<Clas> claslist = new ArrayList<Clas>(); Clas c; public String execute(){  if (rs != null){   System.out.println("RedisService : " + rs);   getAllClas();  }  ServletActionContext.getRequest().setAttribute("claslist", claslist);  return SUCCESS; } private void getAllClas(){  claslist = new ArrayList<Clas>();    int num = Integer.parseInt(rs.get("clas:count"));  for (int i=0; i<num; i++){   String cid = "clas:" + (i+1);   c = new Clas();   int id = Integer.parseInt(String.valueOf(rs.getHash(cid, "ID")));   c.setId(id);   System.out.println("ID:" + id);   String name = (String) rs.getHash(cid, "NAME");   c.setName(name);   System.out.println("NAME:" + name);   String comment = (String) rs.getHash(cid, "COMMENT");   c.setComment(comment);   System.out.println("COMMENT:" + comment);   claslist.add(c);  } }}

Struts的设置和jsp文件就不详细讲了。

5. Redis数据库

Redis数据库里面的内容（使用的是Redis Desktop Manager）：

最后是运行结果：

当然，这只是实现了从Redis查询数据，还没有实现将Redis作为MySQL的缓存。

5. 添加功能的实现

新建一个Action：RClasAction，实现向Redis添加课程数据，并同步到MySQL。

package com.school.action;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import org.springframework.beans.factory.annotation.Autowired;import com.opensymphony.xwork2.ActionSupport;import com.school.entity.Clas;import com.school.redisclient.RedisService;import com.school.redisclient.RedisTool;import com.school.service.ClasService;@SuppressWarnings("serial")public class RClasAction extends ActionSupport {  @Autowired private ClasService clasService;  RedisService rs = RedisTool.getRedisService(); List<Clas> claslist = new ArrayList<Clas>();  private Clas clas; public Clas getClas() {  return clas; }  public void setClas(Clas Clas) {  this.clas = Clas; }  public String execute(){  saveClas(clas);  return SUCCESS; }  @SuppressWarnings({ "rawtypes", "unchecked" }) private void saveClas(Clas c){  List<String> ids = rs.getList("clas:id");  // clas:id  int num = ids.size();  int id = Integer.parseInt(ids.get(num-1)) + 1;  rs.rightPushList("clas:id", String.valueOf(id));  // clas:count  int count = Integer.parseInt(rs.get("clas:count"));  rs.set("clas:count", String.valueOf(count+1), -1);  // 增加  HashMap hashmap = new HashMap();  hashmap.put("ID", String.valueOf(id));  hashmap.put("NAME", clas.getName());  hashmap.put("COMMENT", clas.getComment());  rs.addHash("clas:" + id, hashmap);  // 同步到MySQL  clasService.saveClas(clas); }}

clas:id是一个List类型的Key-Value，记录了所有的课程ID，取出最后一个ID，再+1，作为增加的课程的ID，同时clas:count的值也要+1。使用addHash()方法向Redis添加了一个Hash类型的Key-Value(也就是一门课程)：

  @SuppressWarnings({ "unchecked", "rawtypes" })  public synchronized void addHash(K key, HashMap map){   redisTemplate.opsForHash().putAll(key, map);  }

同时将该门课程增加到MySQL。

6. 删除功能的实现

新建一个Action：RClasDeleteAction，实现删除Redis的课程数据，并同步到MySQL。

package com.school.action;import org.springframework.beans.factory.annotation.Autowired;import com.opensymphony.xwork2.ActionSupport;import com.school.redisclient.RedisService;import com.school.redisclient.RedisTool;import com.school.service.ClasService;@SuppressWarnings("serial")public class RClasDeleteAction extends ActionSupport {  @Autowired private ClasService clasService;  RedisService rs = RedisTool.getRedisService()  private int id; public int getId(){  return id; } public void setId(int id){  this.id=id; }  public String execute(){   deleteClas(id);  // 同步到MySQL  clasService.deleteClas(id);  return SUCCESS; } private void deleteClas(int id){  // 删除  rs.del("clas:" + id);  // clas:count  int count = Integer.parseInt(rs.get("clas:count"));  rs.set("clas:count", String.valueOf(count-1), -1);  // clas:id  rs.delListItem("clas:id", String.valueOf(id)); }}

直接删除clas:id，再将clas:count的值-1，这两步比较简单，复杂的是从clas:id中删除该课程的ID，使用了delListItem()方法来实现：

  @Override  public synchronized void delListItem(K key, V value){   redisTemplate.opsForList().remove(key, 1, value);  }

redisTemplate.opsForList().remove()方法类似于LREM命令。最后在MySQL中也删除相同的课程。

7. 修改功能的实现

新建一个Action：RClasUpdateAction，实现删除Redis的课程数据，并同步到MySQL。

package com.school.action;import java.util.HashMap;import org.springframework.beans.factory.annotation.Autowired;import com.opensymphony.xwork2.ActionSupport;import com.school.entity.Clas;import com.school.redisclient.RedisService;import com.school.redisclient.RedisTool;import com.school.service.ClasService;@SuppressWarnings("serial")public class RClasUpdateAction extends ActionSupport{  @Autowired private ClasService clasService;  RedisService rs = RedisTool.getRedisService();  private Clas clas; public Clas getClas() {  return clas; } public void setClas(Clas clas) {  this.clas = clas; }  @SuppressWarnings({ "unchecked", "rawtypes" }) public String execute(){  HashMap hashmap = new HashMap();  hashmap.put("ID", String.valueOf(clas.getId()));  hashmap.put("NAME", clas.getName());  hashmap.put("COMMENT", clas.getComment());  rs.putHash("clas:" + clas.getId(), hashmap);  // 同步到MySQL  clasService.updateClas(clas);  return SUCCESS; }}

使用了putHash()方法来更新：

  @SuppressWarnings({ "rawtypes", "unchecked" })  @Override  public synchronized void putHash(K key, HashMap map){   redisTemplate.boundHashOps(key).putAll(map);  }

同时在MySQL做相同的更新操作。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持武林网。

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