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How to use redis in projects

步履不停
步履不停Original
2019-06-22 14:29:374578browse

How to use redis in projects

I remembered that I wanted to integrate Redis into the JavaWeb project before. I searched a lot of tutorials on the Internet but they were not comprehensive. Now I finally figured it out, so I want to share it here.

How to use redis in projects

1. Redis installation

I won’t go into it here. There are many tutorials on the Internet, windows, Linux , my own is built on the server.

Graphical connection

How to use redis in projects

Add caching to business logic

1.1. Interface encapsulation

Commonly used methods to operate redis extract an interface, and create two implementation classes corresponding to the stand-alone version and the cluster version.

1.1.1. Interface definition

##jedisClient

package cn.e3mall.common.jedis;
import java.util.List;
public interface JedisClient {
String set(String key, String value);
String get(String key);
Boolean exists(String key);
Long expire(String key, int seconds);
Long ttl(String key);
Long incr(String key);
Long hset(String key, String field, String value);
String hget(String key, String field);
Long hdel(String key, String... field);
Boolean hexists(String key, String field);
List<String> hvals(String key);
Long del(String key);
}

JedisClientPool

package cn.e3mall.common.jedis;
import java.util.List;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
public class JedisClientPool implements JedisClient {
private JedisPool jedisPool;
public JedisPool getJedisPool() {
return jedisPool;
}
public void setJedisPool(JedisPool jedisPool) {
this.jedisPool = jedisPool;
}
@Override
public String set(String key, String value) {
Jedis jedis = jedisPool.getResource();
String result = jedis.set(key, value);
jedis.close();
return result;
}
@Override
public String get(String key) {
Jedis jedis = jedisPool.getResource();
String result = jedis.get(key);
jedis.close();
return result;
}
@Override
public Boolean exists(String key) {
Jedis jedis = jedisPool.getResource();
Boolean result = jedis.exists(key);
jedis.close();
return result;
}
@Override
public Long expire(String key, int seconds) {
Jedis jedis = jedisPool.getResource();
Long result = jedis.expire(key, seconds);
jedis.close();
return result;
}
@Override
public Long ttl(String key) {
Jedis jedis = jedisPool.getResource();
Long result = jedis.ttl(key);
jedis.close();
return result;
}
@Override
public Long incr(String key) {
Jedis jedis = jedisPool.getResource();
Long result = jedis.incr(key);
jedis.close();
return result;
}
@Override
public Long hset(String key, String field, String value) {
Jedis jedis = jedisPool.getResource();
Long result = jedis.hset(key, field, value);
jedis.close();
return result;
}
@Override
public String hget(String key, String field) {
Jedis jedis = jedisPool.getResource();
String result = jedis.hget(key, field);
jedis.close();
return result;
}
@Override
public Long hdel(String key, String... field) {
Jedis jedis = jedisPool.getResource();
Long result = jedis.hdel(key, field);
jedis.close();
return result;
}
@Override
public Boolean hexists(String key, String field) {
Jedis jedis = jedisPool.getResource();
Boolean result = jedis.hexists(key, field);
jedis.close();
return result;
}
@Override
public List<String> hvals(String key) {
Jedis jedis = jedisPool.getResource();
List<String> result = jedis.hvals(key);
jedis.close();
return result;
}
@Override
public Long del(String key) {
Jedis jedis = jedisPool.getResource();
Long result = jedis.del(key);
jedis.close();
return result;
}
}

JedisClientCluster

package cn.e3mall.common.jedis;
import java.util.List;
import redis.clients.jedis.JedisCluster;
public class JedisClientCluster implements JedisClient {
private JedisCluster jedisCluster;
public JedisCluster getJedisCluster() {
return jedisCluster;
}
public void setJedisCluster(JedisCluster jedisCluster) {
this.jedisCluster = jedisCluster;
}
@Override
public String set(String key, String value) {
return jedisCluster.set(key, value);
}
@Override
public String get(String key) {
return jedisCluster.get(key);
}
@Override
public Boolean exists(String key) {
return jedisCluster.exists(key);
}
@Override
public Long expire(String key, int seconds) {
return jedisCluster.expire(key, seconds);
}
@Override
public Long ttl(String key) {
return jedisCluster.ttl(key);
}
@Override
public Long incr(String key) {
return jedisCluster.incr(key);
}
@Override
public Long hset(String key, String field, String value) {
return jedisCluster.hset(key, field, value);
}
@Override
public String hget(String key, String field) {
return jedisCluster.hget(key, field);
}
@Override
public Long hdel(String key, String... field) {
return jedisCluster.hdel(key, field);
}
@Override
public Boolean hexists(String key, String field) {
return jedisCluster.hexists(key, field);
}
@Override
public List<String> hvals(String key) {
return jedisCluster.hvals(key);
}
@Override
public Long del(String key) {
return jedisCluster.del(key);
}
}

Configuration: applicationContext-redis.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.2.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.2.xsd">
<!-- 连接redis单机版 -->
<bean id="jedisClientPool" class="cn.e3mall.common.jedis.JedisClientPool">
<property name="jedisPool" ref="jedisPool"></property>
</bean>
<bean id="jedisPool" class="redis.clients.jedis.JedisPool">
<constructor-arg name="host" value="115.159.126.205"/>
<constructor-arg name="port" value="6379"/>
</bean>
<!-- 连接redis集群 -->
<!-- <bean id="jedisClientCluster" class="cn.e3mall.common.jedis.JedisClientCluster">
<property name="jedisCluster" ref="jedisCluster"/>
</bean>
<bean id="jedisCluster" class="redis.clients.jedis.JedisCluster">
<constructor-arg name="nodes">
<set>
<bean class="redis.clients.jedis.HostAndPort">
<constructor-arg name="host" value="192.168.25.162"></constructor-arg>
<constructor-arg name="port" value="7001"></constructor-arg>
</bean> 
<bean class="redis.clients.jedis.HostAndPort">
<constructor-arg name="host" value="192.168.25.162"></constructor-arg>
<constructor-arg name="port" value="7002"></constructor-arg>
</bean> 
<bean class="redis.clients.jedis.HostAndPort">
<constructor-arg name="host" value="192.168.25.162"></constructor-arg>
<constructor-arg name="port" value="7003"></constructor-arg>
</bean> 
<bean class="redis.clients.jedis.HostAndPort">
<constructor-arg name="host" value="192.168.25.162"></constructor-arg>
<constructor-arg name="port" value="7004"></constructor-arg>
</bean> 
<bean class="redis.clients.jedis.HostAndPort">
<constructor-arg name="host" value="192.168.25.162"></constructor-arg>
<constructor-arg name="port" value="7005"></constructor-arg>
</bean> 
<bean class="redis.clients.jedis.HostAndPort">
<constructor-arg name="host" value="192.168.25.162"></constructor-arg>
<constructor-arg name="port" value="7006"></constructor-arg>
</bean> 
</set>
</constructor-arg>
</bean> -->
</beans>

Package code test

@Test
public void testJedisClient() throws Exception {
//初始化Spring容器
ApplicationContext applicationContext = new ClassPathXmlApplicationContext("classpath:spring/applicationContext-redis.xml");
//从容器中获得JedisClient对象
JedisClient jedisClient = applicationContext.getBean(JedisClient.class);
jedisClient.set("first", "100");
String result = jedisClient.get("first");
System.out.println(result);
}

Add cache

1.1.1. Function analysis

Add cache when querying the content list.

1. Query the cache before querying the database.

2. After querying the results, respond directly to the results.

3. The query cannot be found. There is no need to query the database in the cache.

4. Add the query results to the cache.

5. Return the result. 

向redis中添加缓存：
Key：cid
Value：内容列表。需要把java对象转换成json。
 
使用hash对key进行归类。
HASH_KEY:HASH
            |--KEY:VALUE
            |--KEY:VALUE
            |--KEY:VALUE
            |--KEY:VALUE

Note: Adding cache cannot affect normal business logic.

Code implementation (implemented in the service layer)

@Autowired
private JedisClient jedisClient;
@Value("${CONTENT_LIST}")
private String CONTENT_LIST;
@Override
public E3Result addContent(TbContent content) {
//将内容数据插入到内容表
content.setCreated(new Date());
content.setUpdated(new Date());
//插入到数据库
contentMapper.insert(content);
//缓存同步,删除缓存中对应的数据。
jedisClient.hdel(CONTENT_LIST, content.getCategoryId().toString());
return E3Result.ok();
}
@Override
public List<TbContent> getContentListByCid(long cid) {
//查询缓存
try {
//如果缓存中有直接响应结果
String json = jedisClient.hget(CONTENT_LIST, cid + "");
if (StringUtils.isNotBlank(json)) {
List<TbContent> list = JsonUtils.jsonToList(json,TbContent.class);
System.out.println("从缓存中查出的数据");
return list;
}
} catch (Exception e) {
e.printStackTrace();
}
//如果没有查询数据库
TbContentExample example = new TbContentExample();
Criteria criteria = example.createCriteria();
//设置查询条件
criteria.andCategoryIdEqualTo(cid);
//执行查询
List<TbContent> list = contentMapper.selectByExampleWithBLOBs(example);
//把结果添加到缓存
try {
System.out.println("把结果添加到缓存");
jedisClient.hset(CONTENT_LIST, cid + "", JsonUtils.objectToJson(list));
} catch (Exception e) {
e.printStackTrace();
}
return list;
}

**Note that cache synchronization is required

Let’s talk about one more thing, hot cache, set an expiration time for it (it’s okay to not synchronize)

How to use redis in projects

  @Override
public TbItem getItemById(long itemId) {
//获取商品添加缓存，不影业务响逻辑，try-catch
try {
System.out.println("缓存获取商品信息");
String json = jedisClient.get(REDIS_ITEM_PRE+":"+itemId+":BASE");
if(StringUtils.isNotBlank(json)) {
TbItem tbItem = JsonUtils.jsonToPojo(json,TbItem.class);
return tbItem;
}
}catch(Exception e) {
e.printStackTrace();
}
//缓存中没有，查询数据库
//根据主键查询
//TbItem tbItem = itemMapper.selectByPrimaryKey(itemId);
TbItemExample example = new TbItemExample();
Criteria criteria = example.createCriteria();
//设置查询条件
criteria.andIdEqualTo(itemId);
//执行查询
List<TbItem> list = itemMapper.selectByExample(example);
if (list != null && list.size() > 0) {
//结果添加到缓存
try {
System.out.println("缓存添加商品信息");
jedisClient.set(REDIS_ITEM_PRE+":"+itemId+":BASE",JsonUtils.objectToJson(list.get(0)));
//设置过期时间(1个小时)
jedisClient.expire(REDIS_ITEM_PRE+":"+itemId+":BASE",TIEM_CACHE_EXPIRE);
}catch(Exception e) {
e.printStackTrace();
}
return list.get(0);
}
return null;
}

How to use redis in projects

Data in redis: 

{"itemId":1231490,"created":1425821627000,"updated":1425821627000,"itemDesc":"<table cellpadding=\"0\" cellspacing=\"0\" align=\"center\" border=\"0\" width=\"750\">  <tbody>    <tr>      <td height=\"51\" width=\"750\"><div style=\"PADDING-BOTTOM: 15px; LINE-HEIGHT: 1.5em; PADDING-LEFT: 15px; PADDING-RIGHT: 15px; FONT-FAMILY: &#39;微软雅黑&#39;; FONT-SIZE: 15px; PADDING-TOP: 15px\"><span style=\"color:#ff6666;\"><strong>温馨提示：</strong></span><strong>小米4联通版</strong>内置运营商软件，<strong>小米4官方联通版</strong>是无内置运营商软件的。</div></td>    </tr>  </tbody></table><div class=\"content_tpl\">    <div class=\"formwork_bt\" id=\"detail-tag-id-0\" name=\"detail-tag-id-0\" text=\"产品展示\">   <div class=\"formwork_bt_dz\">    <span>产品展示</span>    <span class=\"s2\">Products Exhibition</span>   </div>  </div> <table cellpadding=\"0\" cellspacing=\"6\" align=\"center\" border=\"0\" width=\"750\">  <tbody><tr>    <td><img src=\"http://img30.360buyimg.com/jgsq-productsoa/jfs/t346/347/1422821621/45195/e22eac9b/5439038bNa168d543.jpg\" alt=\"\" /></td>    <td><p class=\"formwork_titleleft\">小米手机4</p><p class=\"formwork_titleleft2\">依然出色性能用智能手机阅读、拍照、游戏甚至完成复杂艰巨的任务，这一切都依赖于快。每一代小米手机，都使用了当前先进的元器件。更快的处理器、更快的闪存、更快的相机和图像处理，支持更快的网络。集世界全新科技在一部5英寸大小的设备，只为让科技乐趣人人都可享用，生活正因此变得更加美好</p></td>  </tr></tbody></table>    <div class=\"formwork_bt\" id=\"detail-tag-id-2\" name=\"detail-tag-id-2\" text=\"产品信息\">   <div class=\"formwork_bt_dz\">    <span>产品信息</span>    <span class=\"s2\">Product Information</span>   </div>  </div> <div class=\"formwork\"><div class=\"formwork_titlecenter\">Qualcomm&reg; 骁龙? 801四核2.5GHz 处理器</div><div class=\"formwork_text\">高端手机处理器性能之王小米手机 4 采用了高通动力十足的骁龙801手机处理器，内含四个Krait 400 2.5GHz 处理核心。运算速度提升14%，性能更强大。它能出色地同时处理多个复杂任务。它的强大还体现在图像处理器速度较前代提升近一倍，这让拍照与录像都有了更多玩法和可能性。内含一个 Hexagon DSP 核心，专门以超低功耗运行电影、音乐、拍照等任务。这意味着在性能更强大的同时，手机续航都比以往更加持久耐用。</div></div><div class=\"formwork\"><div class=\"formwork_img\"><img src=\"http://img20.360buyimg.com/vc/jfs/t307/358/1403468763/249668/b4048162/54388804Na68f8ead.png\" alt=\"\" /></div></div><div class=\"formwork\"><div class=\"formwork_titlecenter\">Adreno 330 图形处理器</div><div class=\"formwork_text\">游戏机品质的3D渲染能力Adreno 330 图形处理器支持高级图形处理API，包括OpenGL ES 3.0、OpenCL、RenderscriptCompute和FlexRender 。它之所以能够快速渲染复杂的图形，得益于统一渲染架构及FlexRender 快速渲染技术。统一渲染架构能够根据所渲染的图形类型，动态调整其资源分配方式，像素和顶点渲染均可进行独立调节。FlexRender 技术可以直接或通过延迟渲染模式在图形像素间动态转换，从而帮助Adreno GPU更快速、更高效地渲染游戏图形。</div></div><div class=\"formwork\"><div class=\"formwork_img\"><img src=\"http://img20.360buyimg.com/vc/jfs/t352/350/1359939860/199186/e31d4b62/5438882fN8a00b5ac.png\" alt=\"\" /></div></div><div class=\"formwork\"><div class=\"formwork_titlecenter\">高色饱和度屏，84% NTSC色域</div><div class=\"formwork_text\">鲜艳度比 iPhone 5s 高17%小米手机4 采用了高色彩饱和度夏普/JDI屏幕，整体的色彩饱和度提升17%，令色彩表现力更加丰富。无论在小米手机4上面浏览图片、观看视频，或是使用精彩的App，都能为你呈现逼真的颜色效果。</div></div><div class=\"formwork\"><div class=\"formwork_img\"><img src=\"http://img20.360buyimg.com/vc/jfs/t292/303/1377649814/236958/cf633089/54388856N6b7e3293.png\" alt=\"\" /></div></div><table cellpadding=\"0\" cellspacing=\"6\" align=\"center\" border=\"0\" width=\"750\">  <tbody><tr>    <td><img src=\"http://img20.360buyimg.com/vc/jfs/t337/149/1399837173/112733/5916cfcd/54388886Neddc8729.png\" alt=\"\" /></td>    <td><p class=\"formwork_titleleft\">索尼高画质</p><p class=\"formwork_titleleft2\">最快0.3秒极速对焦如何用手机拍下转瞬即逝的美好瞬间？采用索尼 IMX 214 第二代 1300 万像素 Exmor RS? 堆栈式图像传感器，通过减少片上微透镜与感光二极管的距离，使其更容易集合光线。支持硬件更丰富、噪点更少的照片。6片镜头组采用了闭环式对焦技术，对焦最快至0.3秒，这比主流手机都快了两倍之多。它还具备手机上最大的F1.8大光圈，暗光更出色，背景虚化效果更加柔美。为了让拍摄具备更多便利和趣味，还可以使用魔术对焦功能，先拍照，回看时再选择焦点。不必苦练摄影技能，却可以用小米手机4拍出动人有趣的照片</p></td>  </tr></tbody></table><div class=\"formwork\"><div class=\"formwork_titlecenter\">支持最新4G LTE网络</div><div class=\"formwork_text\">用更快的方式上网、听音乐、看视频移动4G版支持最新中国移动4G（TDD-LTE）网络，下行峰值速率最高可达到132Mbps，上传的速度可达31Mbps。如此之快的传输速度几乎可满足对于无线应用的任何需要。当你外出旅行时，你可以用它随时随地观看在线高清视频，浏览网页或玩最流行的在线游戏，极速的4G网络速度可以带给你酣畅淋漓的使用体验。另可选购联通3G及电信3G版本。</div></div><div class=\"formwork\"><div class=\"formwork_img\"><img src=\"http://img20.360buyimg.com/vc/jfs/t322/260/1373090020/189626/610b2da/543888a1Ncd81c157.png\" alt=\"\" /></div></div><div class=\"formwork\"><div class=\"formwork_titlecenter\">用手机遥控电视、空调</div><div class=\"formwork_text\">配备红外发射器，支持2853款设备小米手机4 内置红外遥控功能，支持与红外接受设备的传输协议，可以通过专门为这一功能定制的小米遥控器App，遥控家里电视、空调等支持红外协议的家用电器。目前已支持2853款设备，更多设备不断更</div></div><div class=\"formwork\"><div class=\"formwork_img\"><img src=\"http://img20.360buyimg.com/vc/jfs/t343/265/1372124071/66786/5ee90d6e/543888d1N3d0c4330.png\" alt=\"\" /></div></div><div class=\"formwork\"><div class=\"formwork_titlecenter\">MIUI V5</div><div class=\"formwork_text\">全球24种语言版本，6500万用户好评如潮MIUI 针对原生 Android 深入系统底层优化，更流畅也更加省电。其次是好看，上千款原创主题，上万种搭配，让手机界面千变万化。更重要的是，它让你的生活更加方便。自动识别陌生电话，识别骚扰、诈骗电话。它还可以迅速找到你需要的生活服务，就连预约餐馆和医院挂号也能在系统中完成。</div></div><div class=\"formwork\"><div class=\"formwork_img\"><img src=\"http://img20.360buyimg.com/vc/jfs/t298/277/1374037756/194959/d1e9ee70/543888f1Na55c4785.png\" alt=\"\" /></div></div></div>"}
{"id":1231490,"title":"小米4 白色 联通3G手机","sellPoint":"卖完下柜！不锈钢金属边框，5英寸屏超窄边，骁龙四核2.5GHz处理器，3G RAM，1
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