详解SSH框架和Redis的整合

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。