java鬼混笔记：redis 3、java下使用redis，自定义一个工具类RedisUtil

记记用java操作redis，我就直接写成一个工具使用，方法也就几个，做个demo，需要哪个再补补。目前是使用单个redis的，加上了连接池，后面再试试集群的redis和分布式的看看。。。上代码。。。

package com.example.demo.utils;import redis.clients.jedis.Jedis;import redis.clients.jedis.JedisPool;import redis.clients.jedis.JedisPoolConfig;public enum MyRedisUtils {INSTANCE;private JedisPool jedisPool;private MyRedisUtils() {// 连接池配置JedisPoolConfig config = new JedisPoolConfig();config.setMaxTotal(10000);// 最大连接数config.setMaxIdle(2000);// 最大空闲连接数config.setMaxWaitMillis(1000 * 100);// 获取连接最大等等时间config.setTestOnBorrow(true);// 获取连接的时检查有效性String ip = "127.0.0.1";int port = 6379;String password = "123";int timeout = 100000;// 连接超时时间jedisPool = new JedisPool(config, ip, port, timeout, password);}public Jedis getJedis() {Jedis jedis = jedisPool.getResource();return jedis;}public String set(String key, String value) {Jedis jedis = null;try {jedis = getJedis();return jedis.set(key, value);} catch (Exception e) {e.printStackTrace();return "-1";} finally {releaseResource(jedis);}}/** * 保存字符串，没有返回null * @param key * @return */public String get(String key) {Jedis jedis = null;try {jedis = getJedis();return jedis.get(key);} catch (Exception e) {e.printStackTrace();return "-1";} finally {releaseResource(jedis);}}/** * 拼接,返回拼接后的长度 * @param key 目标的key * @param value 要接在后面的value * @return */public Long append(String key, String value) {Jedis jedis = null;try {jedis = getJedis();return jedis.append(key, value);} catch (Exception e) {e.printStackTrace();return 0L;} finally {releaseResource(jedis);}}/** * 保存字符串并设置保存有效期,成功返回OK * @param key * @param value * @param seconds * @return */public String setex(String key, String value, int seconds) {Jedis jedis = null;try {jedis = getJedis();return jedis.setex(key, seconds, value);} catch (Exception e) {e.printStackTrace();return "0";} finally {releaseResource(jedis);}}/** * 清空当前库下的数据 * @return */public String flushDB() {Jedis jedis = null;try {jedis = getJedis();return jedis.flushDB();} catch (Exception e) {e.printStackTrace();return "0";} finally {releaseResource(jedis);}}/** * 判断Key是否存在 * @param key * @return */public Boolean exists(String key) {Jedis jedis = null;try {jedis = getJedis();return jedis.exists(key);} catch (Exception e) {e.printStackTrace();return false;} finally {releaseResource(jedis);}}/** * 判断多个Key是否存在,返回存在的数量 * @param keys * @return */public Long exists(String... keys) {Jedis jedis = null;try {jedis = getJedis();return jedis.exists(keys);} catch (Exception e) {e.printStackTrace();return 0L;} finally {releaseResource(jedis);}}// 等等。。。public  void releaseResource(Jedis jedis) {if (jedis != null) {jedis.close();// 资源回收}}}

ok,先记这些先，后面再补上。