redis實戰(java專案應用)
阿新 • • 發佈:2019-01-28
首先,簡單介紹下Redis,redis是一個key-value儲存系統,並提供多種語言的API。和Memcached類似,它支援儲存的value型別相對更多,包括string(字串)、list(連結串列)、set(集合)、zset(sorted set --有序集合)和hash(雜湊型別)。更詳細的介紹可以參照官網(點選開啟連結),本文主要介紹redis在工程專案中的具體應用(Redis的Java客戶端jedis的使用,貼出jedis原始碼地址:點選開啟連結) 下面是具體的步驟:
1.下載jar包,本文使用的是jedis-2.5.2.jar,下載地址:http://grepcode.com/snapshot/repo1.maven.org/maven2/redis.clients/jedis/2.5.2現在很多專案使用maven作為專案依賴管理工具,maven只需在pom.xml檔案中新增以下依賴即可: redis.clients jedis 2.5.2
2.下面即是配置類了,看程式碼:[java] view plain copy
package com.netease.lwt;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.connection.jedis.JedisConnectionFactory;
import org.springframework.data.redis.core.StringRedisTemplate;
import redis.clients.jedis.JedisPoolConfig;
@Configuration
@ComponentScan(basePackages="com.netease.lwt.dao")
public class RedisConfiguration {
public static final String HOST = "e36d254038ee4529.m.cnhza.kvstore.aliyuncs.com";
public static final Integer PORT = 6379;
public static final String PASSWORD = "Laowantong2015";
@Bean
public RedisConnectionFactory jedisConnectionFactory(){
JedisPoolConfig poolConfig = new JedisPoolConfig();
poolConfig.setMaxIdle(8);
poolConfig.setMinIdle(0);
poolConfig.setTestOnBorrow(true);
poolConfig.setTestOnReturn(true);
poolConfig.setTestWhileIdle(true);
JedisConnectionFactory jedisConnectionFactory = new JedisConnectionFactory(poolConfig);
jedisConnectionFactory.setHostName(HOST);
jedisConnectionFactory.setPort(PORT);
jedisConnectionFactory.setPassword(PASSWORD);
return jedisConnectionFactory;
}
@Bean
public StringRedisTemplate redisTemplate(){
StringRedisTemplate redisTemplate = new StringRedisTemplate(jedisConnectionFactory());
return redisTemplate;
}
}
HOST,PORT,PASSWORD分別是伺服器地址,埠,連線密碼,其他的詳細配置可自己根據專案需求動態設定
3.接下來就是資料結構的定義了,redis支援包括string,list,set,sorted set,hash等結構。本專案中只用到了Set,SortSet,HashSet,若需要使用redis其他資料結構,可另行定義類。
redis各資料結構所提供的方法,可參考: http://redisdoc.com/index.html。
(1).redis資料集合名定義(set,get操作需要)
[java] view plain copy
public class RedisSetName {
// setName
public static final String USERGROUPS = "UserGroups";
public static final String GROUPAUCTIONS = "GroupAuctions";
public static final String AUCTIONJSONS = "AuctionJsons";
public static final String AUCTIONGOODS = "AuctionGoods";
public static final String AUCGOODIMAGES = "AucGoodImages";
public static final String GROUPINFOS = "GroupInfos";
public static final String USERAUCTIONISREMIND = "UserAuctionIsRemind";
public static final String USERFRIENDREMARK = "UserFriendRemark";
public static final String GROUPUSERS = "GroupUsers";
public static final String USERINFOS = "UserInfos";
public static final String RELUSERGROUPINFOS = "RelUserGroupInfos";
public static final String GROUPUSEREMARK = "GroupUserRemark";
}
(2)下面就是dao層一些操作定義了。見具體程式碼:因程式碼貼出篇幅過大,下面就只給出sortedset的dao層定義,其他的資料結構操作類似。
本文定義了redis中sortedset型別資料的增刪改查操作,可根據需要新增方法。
[java] view plain copy
package com.netease.lwt.dao;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;
import javax.inject.Inject;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Repository;
@Repository
public class RedisSetRepository {
private StringRedisTemplate redisTemplate;
@Inject
public RedisSetRepository(StringRedisTemplate redisTemplate){
this.redisTemplate = redisTemplate;
}
public Long add(String setName, String value) {
Long num = redisTemplate.opsForSet().add(setName, value);
return num;
}
public Long add(String setName, List values) {
Long num = new Long(0);
for(String value : values){
num += redisTemplate.opsForSet().add(setName, value);
}
return num;
}
public Long remove(String setName, String value){
Long num = redisTemplate.opsForSet().remove(setName, value);
return num;
}
public void removeAll(String setName) {
redisTemplate.opsForSet().remove(setName, redisTemplate.opsForSet().members(setName));
}
public List getAll(String setName){
setMembers = redisTemplate.opsForSet().members(setName);
return new ArrayList(setMembers);
}
}
(3)接下來就可以在自己的Service層定義自己的方法了,比如你把使用者資訊快取了,那在Service中需要獲取使用者資訊的時候就可以通過上數dao層定義的方法上獲取了。下面貼出本專案中一個使用例項
[html] view plain copy
/************************************** Redis相關增加/修改/刪除操作 **************************************************************/
@Override
public void save(Group group) {
groupRepository.save(group);
redisHashSetRepository.set(
RedisSetName.generateSetName(RedisSetName.GROUPINFOS,
group.getIm()), "name", group.getName());
}
public void deleteGroup(Group group) {
groupRepository.deleteByIm(group.getIm());
redisHashSetRepository.remove(
RedisSetName.generateSetName(RedisSetName.GROUPINFOS,
group.getIm()), "name");
}
[html] view plain copy
/*************************************** Redis相關查詢操作**************************************************************/
@Override
public List findGroupImsByUser(String uid) throws CustomException {
return ims = redisSetRepository.getAll(RedisSetName.generateSetName(RedisSetName.USERGROUPS, uid));
}