redis在项目中的使用（单机版、集群版）

1.下载jar包：jedis-2.6.2.jar

2.代码：

JedisDao.java：

package com.test.www.dao;

public interface JedisDao {
    //抽取jedis访问redis服务器常用方法
    //String
    public String set(String key,String value);
    public String get(String key);
    //自增
    public Long incr(String key);
    //自减
    public Long decr(String key);
    //过期时间
    public Long expire(String key, int seconds);
    //查询过期剩余时间
    public Long ttl(String key);
    //HASH
    public Long hset(String key, String field, String value);
    public String hget(String key, String field);
    //删除
    public Long hdel(String key, String field);
    // public String setObject(String key, Object value);Object改成泛型T
    public <T> String setObject(String key, T value);
    public Object getObject(String key);

}

SingleJedisDaoImpl.java：（单机版）

/*package com.test.www.dao.impl;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;

import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;

import com.test.www.dao.JedisDao;
import com.test.www.utils.SerializeUtil;
@Repository
public class SingleJedisDaoImpl implements JedisDao {

    //注入单机版jedis连接池对象
    @Autowired
    private JedisPool jedisPool;

    @Override
    public String set(String key, String value) {
        // TODO Auto-generated method stub
        Jedis jedis = jedisPool.getResource();
        String set = jedis.set(key, value);
        return set;
    }

    @Override
    public String get(String key) {
        // TODO Auto-generated method stub
        Jedis jedis = jedisPool.getResource();
        String value = jedis.get(key);
        return value;
    }

    @Override
    public Long incr(String key) {
        // TODO Auto-generated method stub
        Jedis jedis = jedisPool.getResource();
        Long incr = jedis.incr(key);
        return incr;
    }

    @Override
    public Long decr(String key) {
        // TODO Auto-generated method stub
        Jedis jedis = jedisPool.getResource();
        Long decr = jedis.decr(key);
        return decr;
    }

    @Override
    public Long expire(String key, int seconds) {
        // TODO Auto-generated method stub
        Jedis jedis = jedisPool.getResource();
        Long expire = jedis.expire(key, seconds);
        return expire;
    }

    @Override
    public Long ttl(String key) {
        // TODO Auto-generated method stub
        Jedis jedis = jedisPool.getResource();
        Long ttl = jedis.ttl(key);
        return ttl;
    }

    @Override
    public Long hset(String key, String field, String value) {
        // TODO Auto-generated method stub
        Jedis jedis = jedisPool.getResource();
        Long hset = jedis.hset(key, field, value);
        return hset;
    }

    @Override
    public String hget(String key, String field) {
        // TODO Auto-generated method stub
        Jedis jedis = jedisPool.getResource();
        String hget = jedis.hget(key, field);
        return hget;
    }

    @Override
    public Long hdel(String key, String field) {
        // TODO Auto-generated method stub
        Jedis jedis = jedisPool.getResource();
        Long hdel = jedis.hdel(key, field);
        return hdel;
    }

    @Override
    public <T> String setObject(String key, T value) {
        Jedis jedis = jedisPool.getResource();
        String set = jedis.set(SerializeUtil.serialize(key), SerializeUtil.serialize(value));
        return set;
    }

    @Override
    public Object getObject(String key) {
        Jedis jedis = jedisPool.getResource();
        byte[] value = jedis.get(SerializeUtil.serialize(key));
        return SerializeUtil.unserialize(value);
    }

}
*/

ClusterJedisDaoImpl.java（集群）（集群的搭建详见redis集群搭建，地址：https://www.cnblogs.com/super-chao/p/9329018.html）

package com.test.www.dao.impl;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;

import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisCluster;
import redis.clients.jedis.JedisPool;

import com.test.www.dao.JedisDao;
import com.test.www.utils.SerializeUtil;

/**
 * redis集群
 * @className ClusterJedisDaoImpl
 * @author liuyachao
 * @date 2018-7-18
 */
@Repository
public class ClusterJedisDaoImpl implements JedisDao {

    //注解集群对象
    @Autowired
    private JedisCluster jc;

    @Override
    public String set(String key, String value) {
        // TODO Auto-generated method stub
        String set = jc.set(key, value);
        return set;
    }

    @Override
    public String get(String key) {
        // TODO Auto-generated method stub
        String string = jc.get(key);
        System.out.println(jc.getClusterNodes());
        //System.out.println(jc.getDB());
        //System.out.println(jc.info());
        return string;
    }

    @Override
    public Long incr(String key) {
        // TODO Auto-generated method stub
        Long incr = jc.incr(key);
        return incr;
    }

    @Override
    public Long decr(String key) {
        // TODO Auto-generated method stub
        Long decr = jc.decr(key);
        return decr;
    }

    @Override
    public Long expire(String key, int seconds) {
        // TODO Auto-generated method stub
        Long expire = jc.expire(key, seconds);
        return expire;
    }

    @Override
    public Long ttl(String key) {
        // TODO Auto-generated method stub
        Long ttl = jc.ttl(key);
        return ttl;
    }

    @Override
    public Long hset(String key, String field, String value) {
        // TODO Auto-generated method stub
        Long hset = jc.hset(key, field, value);
        return hset;
    }

    @Override
    public String hget(String key, String field) {
        // TODO Auto-generated method stub
        String value = jc.hget(key, field);
        return value;
    }

    @Override
    public Long hdel(String key, String field) {
        // TODO Auto-generated method stub
        Long hdel = jc.hdel(key, field);
        return hdel;
    }

    @Override
    public <T> String setObject(String key, T value) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public Object getObject(String key) {
        // TODO Auto-generated method stub
        return null;
    }

}

PageController.java：

package com.test.www.web.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
@RequestMapping("/page")
public class PageController {
    /**
     * 跳转到大区欢迎页
     * @param map
     * @return
     */
    @RequestMapping("/toArea")
    public String toArea(
            ModelMap map
            ){
        return "area";
    }

    @RequestMapping("/redis")
    public String redis(
            ModelMap map
            ){
        return "redis";
    }
}

配置：
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:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx" xmlns:p="http://www.springframework.org/schema/p"
       xmlns:util="http://www.springframework.org/schema/util" xmlns:jdbc="http://www.springframework.org/schema/jdbc"
       xmlns:cache="http://www.springframework.org/schema/cache"
       xmlns:task="http://www.springframework.org/schema/task"
       xsi:schemaLocation="
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context.xsd
    http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/tx
    http://www.springframework.org/schema/tx/spring-tx.xsd
    http://www.springframework.org/schema/jdbc
    http://www.springframework.org/schema/jdbc/spring-jdbc.xsd
    http://www.springframework.org/schema/cache
    http://www.springframework.org/schema/cache/spring-cache.xsd
    http://www.springframework.org/schema/aop
    http://www.springframework.org/schema/aop/spring-aop.xsd
    http://www.springframework.org/schema/util
    http://www.springframework.org/schema/util/spring-util.xsd
    http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-4.1.xsd">

    <!-- 读取配置文件信息 -->
    <!-- <context:property-placeholder location="classpath:redis.properties" file-encoding="UTF-8" ignore-unresolvable="true"/> -->

    <!-- Jedis 连接池配置 -->
    <bean id="jedisPoolConfig" class="redis.clients.jedis.JedisPoolConfig">
        <property name="maxTotal" value="${redis.pool.maxTotal}"/>
        <property name="maxIdle" value="${redis.pool.maxIdle}"/>
        <property name="maxWaitMillis" value="${redis.pool.maxWaitMillis}"/>
        <property name="testOnBorrow" value="${redis.pool.testOnBorrow}"/>
    </bean>
    <!-- 单机版 -->
    <!-- <bean id="jedisPool" class="redis.clients.jedis.JedisPool">
        <constructor-arg ref="jedisPoolConfig"/>
        <constructor-arg value="${jedis.host}" type="java.lang.String"/>
        <constructor-arg type="int" value="${jedis.port}"/>
    </bean> -->
    <!-- 集群 -->
    <bean class="redis.clients.jedis.JedisCluster">
        <constructor-arg name="nodes">
            <set>
                <!-- <bean class="redis.clients.jedis.HostAndPort">
                    <constructor-arg name="host" value="127.0.0.1"></constructor-arg>
                    <constructor-arg name="port" value="7001"></constructor-arg>
                </bean>
                <bean class="redis.clients.jedis.HostAndPort">
                    <constructor-arg name="host" value="127.0.0.1"></constructor-arg>
                    <constructor-arg name="port" value="7002"></constructor-arg>
                </bean> -->
                <bean class="redis.clients.jedis.HostAndPort">
                    <constructor-arg name="host" value="127.0.0.1"></constructor-arg>
                    <constructor-arg name="port" value="6384"></constructor-arg>
                </bean>
                <bean class="redis.clients.jedis.HostAndPort">
                    <constructor-arg name="host" value="127.0.0.1"></constructor-arg>
                    <constructor-arg name="port" value="6383"></constructor-arg>
                </bean>
                <bean class="redis.clients.jedis.HostAndPort">
                    <constructor-arg name="host" value="127.0.0.1"></constructor-arg>
                    <constructor-arg name="port" value="6382"></constructor-arg>
                </bean>
                <bean class="redis.clients.jedis.HostAndPort">
                    <constructor-arg name="host" value="127.0.0.1"></constructor-arg>
                    <constructor-arg name="port" value="6381"></constructor-arg>
                </bean>
                <bean class="redis.clients.jedis.HostAndPort">
                    <constructor-arg name="host" value="127.0.0.1"></constructor-arg>
                    <constructor-arg name="port" value="6380"></constructor-arg>
                </bean>
                <bean class="redis.clients.jedis.HostAndPort">
                    <constructor-arg name="host" value="127.0.0.1"></constructor-arg>
                    <constructor-arg name="port" value="6379"></constructor-arg>
                </bean>
            </set>
        </constructor-arg>
        <constructor-arg name="poolConfig" ref="jedisPoolConfig"></constructor-arg>
    </bean>
</beans>

redis.properties：

# 控制一个pool可分配多少个jedis实例
redis.pool.maxTotal=1000
# 控制一个pool最多有多少个状态为idle(空闲)的jedis实例
redis.pool.maxIdle=200
# 表示当borrow一个jedis实例时，最大的等待时间，如果超过等待时间，则直接抛出JedisConnectionException
redis.pool.maxWaitMillis=2000
#在borrow一个jedis实例时，是否提前进行validate操作；如果为true，则得到的jedis实例均是可用的
redis.pool.testOnBorrow=true
# redis 单机
# 单机 host
jedis.host=127.0.0.1
# 单机 port
jedis.port=6379

页面：
redis.jsp：

<!DOCTYPE html>
<%@ page language="java" contentType="text/html; charset=UTF-8"%>
<%
    String ctxPath = request.getContextPath();
    request.setAttribute("ctxpath", ctxPath);//项目根路径
%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>首页</title>
<script src="${ctxpath}/js/jquery-1.11.3.min.js"></script>
<script type="text/javascript">
    $(function() {

    });
</script>
</head>
<body>
    <div id="area"></div>
    redis中缓存的用户名：${username }
    <%-- <a href="${ctxpath}/redis/visitHistory.html">redis存数据</a> --%>
    <form action="${ctxpath}/redis/visitHistory.html" method="post">
        username:<input type="text" name="username" />
        <br>
        <input type="submit" value="redis存数据">
    </form>
    <a href="${ctxpath}/redis/getHistory.html">redis获取数据</a>
</body>
</html>

效果图：

单机、集群可相互切换测试，如果使用单机的话，把单机的注释放开，集群注释掉。

单机实现了redis存放各种类型数据（字节流处理）set(String,Object)。

集群版存放为set(String,String)，可转换为json串存放数据，取出数据再解析json串。