之前redis已经描述了redis 的基本作用与用处， 这一篇主要讲述redis运用场景以及分片,和spring整合。redis 存储数据结构大致5种，String 普通键值对，用的比较多。HASH针对 key 唯一标识 hashmap 键值对运用也比较多 list set 当然是集合运用 sortedSet 排序集合使用。
首先看redis 和spring 配置整合
可能开发中redis 服务器一般不止一台 在list 下注入就行。
相信很多时候我们在写代码的时候数据结构运用的恰当能够，帮我审很多事，并且解决很多问题,redis 也一样。自己封装了一下常用的redis 使用工具类
这里主要是针对String类型 封装的方法 ，其他类型基本大致一直。可以对照着网站去理解,
这里的json输出， 序列化 是用的阿里巴巴fastjson,也可以Google gson, protobuf 在序列化方面是比较快的。找时间试一试。
http://redisdoc.com/index.html
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首先看redis 和spring 配置整合
<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"
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-3.1.xsd"><bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"><property name="order" value="2" /><property name="ignoreUnresolvablePlaceholders" value="true" /><property name="locations"><list><value>classpath:demo-provider-module.properties</value></list></property></bean><!-- redis连接池的配置 --><bean id="jedisPoolConfig" class="redis.clients.jedis.JedisPoolConfig"> <property name="maxTotal" value="2048" /> <property name="maxIdle" value="200" /> <property name="numTestsPerEvictionRun" value="1024"/> <property name="timeBetweenEvictionRunsMillis" value="30000" /> <property name="minEvictableIdleTimeMillis" value="-1" /> <property name="softMinEvictableIdleTimeMillis" value="10000" /> <property name="maxWaitMillis" value="1500"/> <property name="testOnBorrow" value="true" /> <property name="testWhileIdle" value="true"/> <property name="testOnReturn" value="false"/> <property name="jmxEnabled" value="true"/> <property name="jmxNamePrefix" value="youyuan"/> <property name="blockWhenExhausted" value="false"/> </bean> <!-- redis的连接池pool，不是必选项：timeout/password --><bean id="shardedJedisPool" class="redis.clients.jedis.ShardedJedisPool"> <constructor-arg index="0" ref="jedisPoolConfig"/> <constructor-arg index="1"> <list> <bean name="master" class="redis.clients.jedis.JedisShardInfo"> <constructor-arg index="0" value="${redis1.server.host}"/> <constructor-arg index="1" value="${redis1.server.port}" type="int"/><!-- 指定参数类型否则可能回报错 --><constructor-arg index="2" value="${redis1.server.timeout}" type="int"/> </bean> </list> </constructor-arg> </bean> </beans>可能开发中redis 服务器一般不止一台 在list 下注入就行。
相信很多时候我们在写代码的时候数据结构运用的恰当能够，帮我审很多事，并且解决很多问题,redis 也一样。自己封装了一下常用的redis 使用工具类
package demo.dcn.cache;
import java.util.ArrayList;
import java.util.List;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import com.alibaba.fastjson.TypeReference;
import com.google.protobuf.Internal.ProtobufList;
/**
* Redis序列化及反序列化工具类
* @author kun.zhang@downjoy.com
*/
public class JedisUtil {
/**
* 把对象转换成json 文本
* @param object
* @return
*/
public static String toJson(Object object){
return JSON.toJSONString(object);
}
/**
* 单独的T 代表一个类型 而 Class<T>代表这个类型所对应的类
* 把JSON文本parse为JavaBean
* @param json
* @param clazz
* @return
*/
public static <T> T toObject(String json,Class<T> clazz){
return JSON.parseObject(json, clazz);
}
/**
* 泛型解析方法
*
* @param json
* @param typeReference
* @return
*/
public static <T> T toObject(String json,TypeReference<T> typeReference){
return JSON.parseObject(json, typeReference);
}
/**
* 把json 文本转换成对象集合形式
* @param json
* @param T
* @return
*/
public static <T> List<T> parseArray(String json,Class<T> T){
return JSON.parseArray(json, T);
}
/**
* 解析数组json 转换成对象集合方式
* @param jsons
* @param clazz
* @return
*/
public static <T> List<T> toObjects(List<String> jsons, Class<T> clazz){
List<T> list = new ArrayList<T>();
for (String json : jsons) {
T obj = toObject(json, clazz);
if(null != obj) {
list.add(obj);
}
}
return list;
}
/**
* 把把JSON文本parse为JSONObject javamap或者JSONArray Javalist
* @param json
* @return
*/
public static Object parseObject(String json){
return JSON.parse(json);
}
/**
* 把JSON文本parse成JSONObject
* @param json
* @return
*/
public static JSONObject parJsonObject(String json){
return JSONObject.parseObject(json);
}
/**
* 把JSON文本parse成JSONArray
* @param text
* @return
*/
public static final JSONArray parseArray(String text){
return JSONArray.parseArray(text);
}
/**
* 将JavaBean序列化为带格式的JSON文本
* @param object
* @param prettyFormat
* @return
*/
public static final String toJSONString(Object object, boolean prettyFormat){
return JSON.toJSONString(object, prettyFormat);
}
/**
* 将JavaBean转换为JSONObject或者JSONArray
* @param javaObject
* @return
*/
public static final Object toJSON(Object javaObject){
return JSON.toJSON(javaObject);
}
}
package demo.dcn.cache;
import redis.clients.jedis.ShardedJedis;
/**
* 自定义分片jedis
* @author kun.zhang@downjoy.com
*/
public class SelfShardedJedis {
private ShardedJedis shardedJedis;//分片
private Boolean isReturn;//是否归还连接池
public SelfShardedJedis(ShardedJedis shardedJedis, Boolean isReturn) {
super();
this.shardedJedis = shardedJedis;
this.isReturn = isReturn;
}
public SelfShardedJedis() {
super();
}
/**
* @return the shardedJedis
*/
public ShardedJedis getShardedJedis() {
return shardedJedis;
}
/**
* @param shardedJedis the shardedJedis to set
*/
public void setShardedJedis(ShardedJedis shardedJedis) {
this.shardedJedis = shardedJedis;
}
/**
* @return the isReturn
*/
public Boolean getIsReturn() {
return isReturn;
}
/**
* @param isReturn the isReturn to set
*/
public void setIsReturn(Boolean isReturn) {
this.isReturn = isReturn;
}
}package demo.dcn.cache;
import java.util.Set;
import javax.annotation.Resource;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisShardInfo;
import redis.clients.jedis.ShardedJedis;
import redis.clients.jedis.ShardedJedisPool;
public class RedisClientBase implements RedisClient {
private final Logger logger = LoggerFactory.getLogger(RedisClientBase.class);
private static final String NX ="NX";//redis 设置key不存在时候起作用
private static final String XX = "XX";//redis 设置key存在 ，才能对键进行操作
private static final String EX ="EX";//redis 设置键固定时间秒
private static final String PX ="PX";//redis 设置键固定时间毫秒
@Resource
private ShardedJedisPool shardedJedisPool;//连接池
public static final int MAX_SCAN_COUNT = 200;
private static RedisClient redisclient;
public RedisClientBase(ShardedJedisPool shardedJedisPool) {
super();
this.shardedJedisPool = shardedJedisPool;
}
public RedisClientBase() {
redisclient = this;
}
public static RedisClient getInstance() {
return redisclient;
}
/**
* 获取一个分片 jedis 客户端
*
* @return
*/
public SelfShardedJedis getShardedJedis(){
ShardedJedis shards = shardedJedisPool.getResource();
SelfShardedJedis selfShardedJedis = new SelfShardedJedis(shards, false);
return selfShardedJedis;
}
/**
* 关闭 jedis 切片池
* @param jedis
* @param broken
*/
@SuppressWarnings({ "null", "deprecation" })
public void closeRedisThread(SelfShardedJedis jedis, boolean broken){
try{
if(jedis!=null||jedis.getIsReturn()){
return;
}
if(broken){
shardedJedisPool.returnBrokenResource(jedis.getShardedJedis());
jedis.setIsReturn(true);
}else{
shardedJedisPool.returnResource(jedis.getShardedJedis());
jedis.setIsReturn(true);
}
}catch(Exception e){
logger.error(e.getMessage(),e);
}
}
/**setnx 的值设为 value ，当且仅当 key 不存在。 若给定的 key 已经存在，则 setNotExists 不做任何动作。
* 保存
* @param key
* @param obj
* @return
* 设置成功，返回 1 ;设置失败，返回 0 。
*/
public Long setNotExists(String key,byte[] obj){
SelfShardedJedis shardedJedis = null;
boolean broken = false;
try{
shardedJedis = getShardedJedis();
return shardedJedis.getShardedJedis().setnx(key.getBytes(), obj);//保存成二进制
}catch(Exception e){
logger.error(e.getMessage(), e);
broken = true;
}finally{
closeRedisThread(shardedJedis, broken);
}
return 0L;
}
/**
* 将 key 的值设为 value ，且设置过期时间，当且仅当 key 不存在。 若给定的 key 已经存在，则 setNotExists 不做任何动作。 * Set the string value as value of the key. The string
* can't be longer than 1073741824 bytes (1 GB).
* @param key
* @param value
* @param nxxx
* @param expx
* @param time
* @return
*/
public String set(String key,String value, String nxxx, String expx, long time){
SelfShardedJedis shardedJedis = null;
boolean broken = false;
try{
shardedJedis = getShardedJedis();
return shardedJedis.getShardedJedis().set(key, value, nxxx, expx, time);
}catch(Exception e){
logger.error(e.getMessage(), e);
broken = true;
} finally {
closeRedisThread(shardedJedis, broken);
}
return null;
}
/**
* 通过key 获取字符串数据
* @param key
* @return
*/
public String getString(String key){
SelfShardedJedis shardedJedis = null;
boolean broken = false;
try{
shardedJedis = getShardedJedis();
return shardedJedis.getShardedJedis().get(key);
}catch(Exception e){
logger.error(e.getMessage(), e);
broken = true;
}finally {
closeRedisThread(shardedJedis, broken);
}
return null;
}
/**
* 设置key过期时间
* @param key
* @param obj
* @param expireTime
* @return
*/
public String setExpire(String key, byte[] obj, int expireTime) {
SelfShardedJedis shardedJedis = null;
boolean broken = false;
try {
shardedJedis = getShardedJedis();
return shardedJedis.getShardedJedis().setex(key.getBytes(), expireTime, obj);
} catch (Exception e) {
logger.error(e.getMessage(), e);
broken = true;
} finally {
closeRedisThread(shardedJedis, broken);
}
return null;
}
/**
* 设置key过期时间
* @param key
* @param expireTime
* @return
*/
public Long expire(String key, int expireTime) {
SelfShardedJedis shardedJedis = null;
boolean broken = false;
try {
shardedJedis = getShardedJedis();
return shardedJedis.getShardedJedis().expire(key, expireTime);
} catch (Exception e) {
logger.error(e.getMessage(), e);
broken = true;
} finally {
closeRedisThread(shardedJedis, broken);
}
return null;
}
/**
* 移除有序集 key 中，指定排名(rank)区间内的所有成员。
* <p/>
* 区间分别以下标参数 start 和 stop 指出，包含 start 和 stop 在内。 下标参数 start 和 stop 都以 0 为底，也就是说，以 0 表示有序集第一个成员，以 1 表示有序集第二个成员，以此类推。 你也可以使用负数下标，以 -1
* 表示最后一个成员， -2 表示倒数第二个成员，以此类推
*
* @param key
* @param start
* @param stop
* @return
*/
public Long zremrangeByRank(String key, long start, long stop) {
long result = 0L;
SelfShardedJedis shardedJedis = null;
boolean broken = false;
try {
shardedJedis = getShardedJedis();
result = shardedJedis.getShardedJedis().zremrangeByRank(key, start, start);
} catch (Exception e) {
broken = true;
logger.error(e.getMessage(), e);
} finally {
closeRedisThread(shardedJedis, broken);
}
return result;
}
/**
* 返回有序集 key 中，指定区间内的成员 其中成员的位置按 score 值递减(从大到小)来排列
*
* @param key
* @param start
* @param stop
* @return
*/
public Set<String> zrevrange(String key, long start, long stop) {
Set<String> result = null;
SelfShardedJedis shardedJedis = null;
boolean broken = false;
try {
shardedJedis = getShardedJedis();
result = shardedJedis.getShardedJedis().zrevrange(key, start, start);
} catch (Exception e) {
broken = true;
logger.error(e.getMessage(), e);
} finally {
closeRedisThread(shardedJedis, broken);
}
return result;
}
/**
* 删除key
* @param key
* @return
*/
public Long del(String key) {
SelfShardedJedis shardedJedis = null;
boolean broken = false;
try {
shardedJedis = getShardedJedis();
return shardedJedis.getShardedJedis().del(key);
} catch (Exception e) {
broken = true;
logger.error(e.getMessage(), e);
} finally {
closeRedisThread(shardedJedis, broken);
}
return null;
}
/**
* 计数器
*
* @param key
* @param seconds 过期时间长度，单位：秒；值为0或负数表示不过期。
* @param roll 时间是否滚动
*/
public Long incr(String key, int seconds, boolean roll) {
long b = 0;
SelfShardedJedis shardedJedis = null;
boolean broken = false;
try {
shardedJedis = getShardedJedis();
b = shardedJedis.getShardedJedis().incr(key.getBytes());
if (seconds > 0) {
if (b == 1) {// 第一次进入，设置过期时间
shardedJedis.getShardedJedis().expire(key.getBytes(), seconds);
}
if (roll && b > 1) {// 时间滚动
shardedJedis.getShardedJedis().expire(key.getBytes(), seconds);
}
}
} catch (Exception e) {
logger.error(e.getMessage(), e);
broken = true;
} finally {
if (broken && shardedJedis != null) {
shardedJedis.getShardedJedis().del(key);
}
closeRedisThread(shardedJedis, broken);
}
return b;
}
/**
* 判断key 是否存在
* @param key
* @return若
*/
public Boolean exists(String key) {
SelfShardedJedis shardedJedis = null;
boolean broken = false;
try {
shardedJedis = getShardedJedis();
return shardedJedis.getShardedJedis().exists(key.getBytes());
} catch (Exception e) {
logger.error(e.getMessage(), e);
broken = true;
} finally {
closeRedisThread(shardedJedis, broken);
}
return false;
}
/**
* 通过key 获取 jedis
* @param key
* @return
*/
public Jedis getShard(String key) {
SelfShardedJedis shardedJedis = null;
boolean broken = false;
try {
shardedJedis = getShardedJedis();
if (shardedJedis != null) {
return shardedJedis.getShardedJedis().getShard(key);
}
} catch (Exception e) {
e.printStackTrace();
logger.error(e.getMessage(), e);
broken = true;
} finally {
closeRedisThread(shardedJedis, broken);
}
return null;
}
/**
* 获取JedisShardInfo
*
* @param key
* @return JedisShareInfo
*/
public JedisShardInfo getShardInfo(String key) {
SelfShardedJedis shardedJedis = null;
boolean broken = false;
try {
shardedJedis = getShardedJedis();
if (shardedJedis != null) {
return shardedJedis.getShardedJedis().getShardInfo(key);
}
} catch (Exception e) {
logger.error(e.getMessage(), e);
broken = true;
} finally {
closeRedisThread(shardedJedis, broken);
}
return null;
}
/**
* 保存字符串键值对
* @param key
* @param value
* @return
*/
public String set(String key, String value) {
SelfShardedJedis shardedJedis = null;
boolean broken = false;
try {
shardedJedis = getShardedJedis();
if (shardedJedis != null) {
return shardedJedis.getShardedJedis().set(key, value);
}
} catch (Exception e) {
logger.error(e.getMessage(), e);
broken = true;
} finally {
closeRedisThread(shardedJedis, broken);
}
return null;
}
/**
* 获取key的类型
* @param key
* @return
*/
public String type(String key) {
SelfShardedJedis shardedJedis = null;
boolean broken = false;
try {
shardedJedis = getShardedJedis();
if (shardedJedis != null) {
return shardedJedis.getShardedJedis().type(key);
}
} catch (Exception e) {
logger.error(e.getMessage(), e);
broken = true;
} finally {
closeRedisThread(shardedJedis, broken);
}
return null;
}
/**
* 获取key 剩余时间 当 key 不存在时，返回 -2 。
* 当 key 存在但没有设置剩余生存时间时，返回 -1 。
* 否则，以秒为单位，返回 key 的剩余生存时间。
* @param key
* @return
*/
public Long ttl(String key) {
SelfShardedJedis shardedJedis = null;
boolean broken = false;
try {
shardedJedis = getShardedJedis();
if (shardedJedis != null) {
return shardedJedis.getShardedJedis().ttl(key);
}
} catch (Exception e) {
logger.error(e.getMessage(), e);
broken = true;
} finally {
closeRedisThread(shardedJedis, broken);
}
return null;
}
/**
* 为key 设定一个新值，并返回旧值
* 返回给定 key 的旧值。
* 当 key 没有旧值时，也即是， key 不存在时，返回 nil 。 不是字符串类型返回错误
* @param key
* @param value
* @return
*/
public String getSet(String key, String value) {
SelfShardedJedis shardedJedis = null;
boolean broken = false;
try {
shardedJedis = getShardedJedis();
if (shardedJedis != null) {
return shardedJedis.getShardedJedis().getSet(key, value);
}
} catch (Exception e) {
logger.error(e.getMessage(), e);
broken = true;
} finally {
closeRedisThread(shardedJedis, broken);
}
return null;
}
/**
* 当key 不存在时候 保存key String类型 存在不做什么操作返回0
* @param key
* @param value
* @return
*/
public Long setnx(String key, String value) {
SelfShardedJedis shardedJedis = null;
boolean broken = false;
try {
shardedJedis = getShardedJedis();
if (shardedJedis != null) {
return shardedJedis.getShardedJedis().setnx(key, value);
}
} catch (Exception e) {
logger.error(e.getMessage(), e);
broken = true;
} finally {
closeRedisThread(shardedJedis, broken);
}
return null;
}
/**
* 设置key 存在修改,不存在保存
* @param key
* @param seconds
* @param value
* @return
*/
public String setex(String key, int seconds, String value) {
SelfShardedJedis shardedJedis = null;
boolean broken = false;
try {
shardedJedis = getShardedJedis();
if (shardedJedis != null) {
return shardedJedis.getShardedJedis().setex(key, seconds, value);
}
} catch (Exception e) {
logger.error(e.getMessage(), e);
broken = true;
} finally {
closeRedisThread(shardedJedis, broken);
}
return null;
}
/**
* 对指定的key 进行减少 如果key 不存在 key值会被初始化0 然后减少
* @param key
* @param integer
* @return
*/
public Long decrBy(String key, long integer) {
SelfShardedJedis shardedJedis = null;
boolean broken = false;
try {
shardedJedis = getShardedJedis();
if (shardedJedis != null) {
return shardedJedis.getShardedJedis().decrBy(key, integer);
}
} catch (Exception e) {
logger.error(e.getMessage(), e);
broken = true;
} finally {
closeRedisThread(shardedJedis, broken);
}
return null;
}
/**
* 如果key 按指定增量增加 key 不存在 创造key 初始化为0 incr 自增为1
* @param key
* @param integer
* @return
*/
public Long incrBy(String key, long integer) {
SelfShardedJedis shardedJedis = null;
boolean broken = false;
try {
shardedJedis = getShardedJedis();
if (shardedJedis != null) {
return shardedJedis.getShardedJedis().incrBy(key, integer);
}
} catch (Exception e) {
logger.error(e.getMessage(), e);
broken = true;
} finally {
closeRedisThread(shardedJedis, broken);
}
return null;
}
/**
* 为已经存在的key追加新值，返回 长度 如果key 不存在，直接设置key为value
* @param key
* @param value
* @return
*/
public Long append(String key, String value) {
SelfShardedJedis shardedJedis = null;
boolean broken = false;
try {
shardedJedis = getShardedJedis();
if (shardedJedis != null) {
return shardedJedis.getShardedJedis().append(key, value);
}
} catch (Exception e) {
logger.error(e.getMessage(), e);
broken = true;
} finally {
closeRedisThread(shardedJedis, broken);
}
return null;
}
/**
* 截取字符串
* @param key
* @param start
* @param end
* @return
*/
public String substr(String key, int start, int end) {
SelfShardedJedis shardedJedis = null;
boolean broken = false;
try {
shardedJedis = getShardedJedis();
if (shardedJedis != null) {
return shardedJedis.getShardedJedis().substr(key, start, end);
}
} catch (Exception e) {
logger.error(e.getMessage(), e);
broken = true;
} finally {
closeRedisThread(shardedJedis, broken);
}
return null;
}
}这里主要是针对String类型 封装的方法 ，其他类型基本大致一直。可以对照着网站去理解,
这里的json输出， 序列化 是用的阿里巴巴fastjson,也可以Google gson, protobuf 在序列化方面是比较快的。找时间试一试。
http://redisdoc.com/index.html
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