一個已有的Struts+Spring+Hibernate項目，以前使用MySQL數(shù)據(jù)庫，現(xiàn)在想把Redis也整合進去。
1. 相關(guān)Jar文件
下載并導(dǎo)入以下3個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文件夾下面新建一個redis.properties文件，設(shè)置連接Redis的一些屬性。
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
再新建一個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類
新建一個com.school.redisclient包，結(jié)構(gòu)如下：
接口IRedisService：
public interface IRedisServiceK, 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);
}
抽象類AbstractRedisService，主要是對RedisTemplate進行操作：
public abstract class AbstractRedisServiceK, V> implements IRedisServiceK, V> {
@Autowired
private RedisTemplateK, V> redisTemplate;
public RedisTemplateK, V> getRedisTemplate() {
return redisTemplate;
}
public void setRedisTemplate(RedisTemplateK, V> redisTemplate) {
this.redisTemplate = redisTemplate;
}
@Override
public void set(final K key, final V value, final long expiredTime) {
BoundValueOperationsK, 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) {
BoundValueOperationsK, 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);
}
}
}
實現(xiàn)類RedisService：
@Service("redisService")
public class RedisService extends AbstractRedisServiceString, String> {
}
工具類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. 查詢功能的實現(xiàn)
新建一個Action：RClasQueryAction，返回Redis里面所有的課程數(shù)據(jù)。
@SuppressWarnings("serial")
public class RClasQueryAction extends ActionSupport {
RedisService rs = RedisTool.getRedisService();
ListClas> claslist = new ArrayListClas>();
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 ArrayListClas>();
int num = Integer.parseInt(rs.get("clas:count"));
for (int i=0; inum; 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的設(shè)置和jsp文件就不詳細講了。
5. Redis數(shù)據(jù)庫
Redis數(shù)據(jù)庫里面的內(nèi)容（使用的是Redis Desktop Manager）：
最后是運行結(jié)果：
當(dāng)然，這只是實現(xiàn)了從Redis查詢數(shù)據(jù)，還沒有實現(xiàn)將Redis作為MySQL的緩存。
5. 添加功能的實現(xiàn)
新建一個Action：RClasAction，實現(xiàn)向Redis添加課程數(shù)據(jù)，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();
ListClas> claslist = new ArrayListClas>();
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){
ListString> 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是一個List類型的Key-Value，記錄了所有的課程ID，取出最后一個ID，再+1，作為增加的課程的ID，同時clas:count的值也要+1。使用addHash()方法向Redis添加了一個Hash類型的Key-Value(也就是一門課程)：
@SuppressWarnings({ "unchecked", "rawtypes" })
public synchronized void addHash(K key, HashMap map){
redisTemplate.opsForHash().putAll(key, map);
}
同時將該門課程增加到MySQL。
6. 刪除功能的實現(xiàn)
新建一個Action：RClasDeleteAction，實現(xiàn)刪除Redis的課程數(shù)據(jù)，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){
// 刪除
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));
}
}
直接刪除clas:id，再將clas:count的值-1，這兩步比較簡單，復(fù)雜的是從clas:id中刪除該課程的ID，使用了delListItem()方法來實現(xiàn)：
@Override
public synchronized void delListItem(K key, V value){
redisTemplate.opsForList().remove(key, 1, value);
}
redisTemplate.opsForList().remove()方法類似于LREM命令。最后在MySQL中也刪除相同的課程。
7. 修改功能的實現(xiàn)
新建一個Action：RClasUpdateAction，實現(xiàn)刪除Redis的課程數(shù)據(jù)，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()方法來更新：
@SuppressWarnings({ "rawtypes", "unchecked" })
@Override
public synchronized void putHash(K key, HashMap map){
redisTemplate.boundHashOps(key).putAll(map);
}
同時在MySQL做相同的更新操作。
以上就是本文的全部內(nèi)容，希望對大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。
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