Java集成Redis，编写Redis操作工具类（SpringMVC框架）

Java集成Redis+Jedis

0、pom.xml依赖、redis.properties属性配置

pom.xml：

<dependency>
      <groupId>redis.clientsgroupId>
      <artifactId>jedisartifactId>
      <version>2.6.0version>
    dependency>

redis.properties：

#redis config start

redis.ip=127.0.0.1
redis.port=6379


#最大连接数
redis.max.total=20

#最大空闲数
redis.max.idle=10

#最小空闲数
redis.min.idle=2

#从jedis连接池获取连接时，校验并返回可用的连接
redis.test.borrow=true

#把连接放回jedis连接池时，校验并返回可用的连接
redis.test.return=false

#redis config end

1、设计RedisPool（redis连接池类）

RedisPool.java：

package com.jack.common;

import com.jack.util.PropertiesUtil;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig;

/**
 * Created by jack
 */
public class RedisPool {
    private static JedisPool pool;//jedis连接池
    private static Integer maxTotal = Integer.parseInt(PropertiesUtil.getProperty("redis.max.total","20")); //最大连接数
    private static Integer maxIdle = Integer.parseInt(PropertiesUtil.getProperty("redis.max.idle","20"));//在jedispool中最大的idle状态(空闲的)的jedis实例的个数
    private static Integer minIdle = Integer.parseInt(PropertiesUtil.getProperty("redis.min.idle","20"));//在jedispool中最小的idle状态(空闲的)的jedis实例的个数

    private static Boolean testOnBorrow = Boolean.parseBoolean(PropertiesUtil.getProperty("redis.test.borrow","true"));//在borrow一个jedis实例的时候，是否要进行验证操作，如果赋值true。则得到的jedis实例肯定是可以用的。
    private static Boolean testOnReturn = Boolean.parseBoolean(PropertiesUtil.getProperty("redis.test.return","true"));//在return一个jedis实例的时候，是否要进行验证操作，如果赋值true。则放回jedispool的jedis实例肯定是可以用的。

    private static String redisIp = PropertiesUtil.getProperty("redis.ip");
    private static Integer redisPort = Integer.parseInt(PropertiesUtil.getProperty("redis.port"));


    private static void initPool(){
        JedisPoolConfig config = new JedisPoolConfig();

        config.setMaxTotal(maxTotal);
        config.setMaxIdle(maxIdle);
        config.setMinIdle(minIdle);

        config.setTestOnBorrow(testOnBorrow);
        config.setTestOnReturn(testOnReturn);

        config.setBlockWhenExhausted(true);//连接耗尽的时候，是否阻塞，false会抛出异常，true阻塞直到超时。默认为true。

        pool = new JedisPool(config,redisIp,redisPort,1000*2);
    }

    static{
        initPool();
    }

    public static Jedis getJedis(){
        return pool.getResource();
    }


    public static void returnBrokenResource(Jedis jedis){
        pool.returnBrokenResource(jedis);
    }


    public static void returnResource(Jedis jedis){
        pool.returnResource(jedis);
    }

    public static void main(String[] args) {
        Jedis jedis = pool.getResource();
        jedis.set("geelykey","geelyvalue");
        returnResource(jedis);

        pool.destroy();//临时调用，销毁连接池中的所有连接
        System.out.println("program is end");
    }
}

PropertiesUtil.java：（获取redis.properties属性工具类）

因为有用到Slf4j来输出日志所以需要导入lombok依赖：

<dependency>
      <groupId>org.projectlombokgroupId>
      <artifactId>lombokartifactId>
      <version>1.16.18version>
    dependency>

package com.jack.util;

import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;

import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Properties;

/**
 * Created by jack
 */
@Slf4j
public class PropertiesUtil {


    private static Properties props;

    static {
        String fileName = "redis.properties";
        props = new Properties();
        try {
            props.load(new InputStreamReader(PropertiesUtil.class.getClassLoader().getResourceAsStream(fileName),"UTF-8"));
        } catch (IOException e) {
            log.error("配置文件读取异常",e);
        }
    }

    public static String getProperty(String key){
        String value = props.getProperty(key.trim());
        if(StringUtils.isBlank(value)){
            return null;
        }
        return value.trim();
    }

    public static String getProperty(String key,String defaultValue){

        String value = props.getProperty(key.trim());
        if(StringUtils.isBlank(value)){
            value = defaultValue;
        }
        return value.trim();
    }
}

2、设计RedisPoolUtil（封装redis的操作方法）

同样pom需要导入lombok依赖支持

package com.jack.util;

import com.jack.common.RedisPool;
import lombok.extern.slf4j.Slf4j;
import redis.clients.jedis.Jedis;

/**
 * Created by jack
 */
@Slf4j
public class RedisPoolUtil {


    /**
     * 设置key的有效期，单位是秒
     * @param key
     * @param exTime
     * @return
     */
    public static Long expire(String key,int exTime){
        Jedis jedis = null;
        Long result = null;

        try {
            jedis = RedisPool.getJedis();
            result = jedis.expire(key,exTime);
        } catch (Exception e) {
            log.error("expire key:{} error",key,e);
            RedisPool.returnBrokenResource(jedis);
            return result;
        }
        RedisPool.returnResource(jedis);
        return result;
    }

    //exTime的单位是秒
    public static String setEx(String key,String value,int exTime){
        Jedis jedis = null;
        String result = null;
        try {
            jedis = RedisPool.getJedis();
            result = jedis.setex(key,exTime,value);
        } catch (Exception e) {
            log.error("setex key:{} value:{} error",key,value,e);
            RedisPool.returnBrokenResource(jedis);
            return result;
        }
        RedisPool.returnResource(jedis);
        return result;
    }

    public static String set(String key,String value){
        Jedis jedis = null;
        String result = null;

        try {
            jedis = RedisPool.getJedis();
            result = jedis.set(key,value);
        } catch (Exception e) {
            log.error("set key:{} value:{} error",key,value,e);
            RedisPool.returnBrokenResource(jedis);
            return result;
        }
        RedisPool.returnResource(jedis);
        return result;
    }

    public static String get(String key){
        Jedis jedis = null;
        String result = null;
        try {
            jedis = RedisPool.getJedis();
            result = jedis.get(key);
        } catch (Exception e) {
            log.error("get key:{} error",key,e);
            RedisPool.returnBrokenResource(jedis);
            return result;
        }
        RedisPool.returnResource(jedis);
        return result;
    }

    public static Long del(String key){
        Jedis jedis = null;
        Long result = null;
        try {
            jedis = RedisPool.getJedis();
            result = jedis.del(key);
        } catch (Exception e) {
            log.error("del key:{} error",key,e);
            RedisPool.returnBrokenResource(jedis);
            return result;
        }
        RedisPool.returnResource(jedis);
        return result;
    }

    public static void main(String[] args) {
        Jedis jedis = RedisPool.getJedis();

        jedis.set("keyTest","value");

        String value = jedis.get("keyTest");

        jedis.setEx("keyex","valueex",60*10);

        jedis.expire("keyTest",60*20);

        jedis.del("keyTest");

        System.out.println("end");
    }
}

完。