Redis是一个开源的使用ANSI C语言编写、遵守BSD协议、支持网络、可基于内存亦可持久化的日志型、Key-Value数据库,并提供多种语言的API。 我们在进行Java项目开发的时候,如果要使用Redis数据库,那么常常是通过Redis的Java客户端来简化Redis的使用,例如Redisson,Jedis,lettuce等等,我们本篇就以Jedis为例进行Redis的学习以及Jedis源码的探究。
一、Redis常见API
由于Redis有5中数据类型,每种数据类型的基本操作API也存在差异,同时Redis有数种部署模式,在使用时,也就存在直接访问以及集群访问两种情况,因此在调用API时也有所差别。
1、直接访问模式
我们如果是单机、主从乃至哨兵模式时,都是直接对接点进行访问,因此通过Jedis进行API访问时,代码如下所示:
public class JedisApi { private Jedis jedis; public String KEY = "monkey"; public String VALUES = "2019"; @Before public void setUp() { jedis = new Jedis("192.168.0.31", 6379); } /*** * 通过我们jedis对redis的key进行相应的操作 */ @org.junit.Test public void testKey() { System.out.println("清空数据:" + jedis.flushDB());//清空当前数据库 System.out.println("判断某个键是否存在:" + jedis.exists("username")); System.out.println("新增<'username','zzh'>的键值对:" + jedis.set("username", "zzh")); Set<String> keys = jedis.keys("*"); System.out.println("系统中所有的键如下:" + keys); System.out.println("删除键password:" + jedis.del("username")); System.out.println("查看键username所存储的值的类型:" + jedis.type("username")); } /*** * 剩余时间 秒 */ @Test public void testTtl() { long ttl = jedis.ttl(KEY); System.out.println("倒计时时间 :" + ttl); } /*** * 剩余时间 毫秒 * 区别 单位不一样 */ @Test public void testPttl() { long pttl = jedis.pttl(KEY); System.out.println("pttl is :" + pttl); } /*** * Jedis操作redis的字符串 */ @Test public void testString() { jedis.flushDB(); System.out.println(jedis.set("key3", "value3")); System.out.println("在key3后面加入值:" + jedis.append("key3", "End")); System.out.println("key3的值:" + jedis.get("key3")); System.out.println("增加多个键值对:" + jedis.mset("key01", "value01", "key02", "value02", "key03", "value03")); System.out.println("获取多个键值对:" + jedis.mget("key01", "key02", "key03")); System.out.println("获取多个键值对:" + jedis.mget("key01", "key02", "key03", "key04")); System.out.println("删除多个键值对:" + jedis.del(new String[]{"key01", "key02"})); System.out.println("获取多个键值对:" + jedis.mget("key01", "key02", "key03")); jedis.flushDB(); System.out.println("===========新增键值对防止覆盖原先值=============="); System.out.println(jedis.setnx("key1", "value1")); System.out.println(jedis.setnx("key2", "value2")); System.out.println(jedis.setnx("key2", "value2-new")); System.out.println(jedis.get("key1")); System.out.println(jedis.get("key2")); System.out.println("===========获取原值,更新为新值==========");//GETSET is an atomic set this value and return the old value command. System.out.println(jedis.getSet("key2", "key2GetSet")); System.out.println(jedis.get("key2")); } @Test public void testList() { jedis.flushDB(); System.out.println("===========添加一个list==========="); jedis.lpush("collections", "monkey", "zhangsan", "wangwu", "xiaoming", "xiaoer", "tangseng"); System.out.println("collections的内容:" + jedis.lrange("collections", 0, -1)); System.out.println("collections的长度:" + jedis.llen("collections")); jedis.lpush("sortedList排序后", "3", "6", "2", "0", "7", "4"); System.out.println(jedis.sort("sortedList排序后")); System.out.println("sortedList排序后:" + jedis.lrange("sortedList排序后", 0, -1)); } /*** * 键值对方式 */ @Test public void testMset() { jedis.mset(new String[]{"name", "monkey", "age", "18", "qq", "111111"}); System.out.printf("姓名:%s,年龄:%s,联系方式:%s", jedis.get("name"), jedis.get("age"), jedis.get("qq")); } /*** * 不能重复 set */ @Test public void testSet() { jedis.flushDB(); System.out.println("============向集合中添加元素============"); System.out.println(jedis.sadd("eleSet", "e1", "e2", "e4", "e3", "e0", "e8", "e7", "e5")); System.out.println(jedis.sadd("eleSet", "e6")); System.out.println(jedis.sadd("eleSet", "e6"));//重复问题 1 or 0 System.out.println("eleSet的所有元素为:" + jedis.smembers("eleSet")); System.out.println("================================="); System.out.println(jedis.sadd("eleSet1", "e1", "e2", "e4", "e3", "e0", "e8", "e7", "e5")); System.out.println("============集合运算================="); System.out.println("eleSet和eleSet1的交集:" + jedis.sinter("eleSet", "eleSet1")); System.out.println("eleSet和eleSet1的并集:" + jedis.sunion("eleSet", "eleSet1")); System.out.println("eleSet和eleSet1的差集:" + jedis.sdiff("eleSet", "eleSet1"));//eleSet1中有,eleSet2中没有 } /*** * 散列 */ @Test public void testHash() { jedis.flushDB(); Map<String, String> map = new HashMap<String, String>(); map.put("zhangsan", "a"); map.put("canglaoshi", "b"); map.put("monkey", "c"); map.put("wangwu", "d"); jedis.hmset("hash", map); jedis.hset("hash", "luban", "e"); System.out.println("散列hash的所有键值对为:" + jedis.hgetAll("hash"));//return Map<String,String> System.out.println("散列hash的所有键为:" + jedis.hkeys("hash"));//return Set<String> System.out.println("散列hash的所有值为:" + jedis.hvals("hash"));//return List<String> } }
执行结果如下:
清空数据:OK 判断某个键是否存在:false 新增<'username','zzh'>的键值对:OK 系统中所有的键如下:[username] 删除键password:1 查看键username所存储的值的类型:none ============向集合中添加元素============ 8 1 0 eleSet的所有元素为:[e7, e2, e4, e0, e8, e5, e1, e3, e6] ================================= 8 ============集合运算================= eleSet和eleSet1的交集:[e3, e7, e2, e4, e0, e8, e5, e1] eleSet和eleSet1的并集:[e6, e3, e7, e4, e0, e1, e5, e2, e8] eleSet和eleSet1的差集:[e6] 倒计时时间 :-2 散列hash的所有键值对为:{zhangsan=a, wangwu=d, monkey=c, luban=e, canglaoshi=b} 散列hash的所有键为:[zhangsan, wangwu, monkey, luban, canglaoshi] 散列hash的所有值为:[c, b, d, a, e] ===========添加一个list=========== collections的内容:[tangseng, xiaoer, xiaoming, wangwu, zhangsan, monkey] collections的长度:6 [0, 2, 3, 4, 6, 7] sortedList排序后:[4, 7, 0, 2, 6, 3] 姓名:monkey,年龄:18,联系方式:111111pttl is :-2 OK 在key3后面加入值:9 key3的值:value3End 增加多个键值对:OK 获取多个键值对:[value01, value02, value03] 获取多个键值对:[value01, value02, value03, null] 删除多个键值对:2 获取多个键值对:[null, null, value03] ===========新增键值对防止覆盖原先值============== 1 1 0 value1 value2 ===========获取原值,更新为新值========== value2 key2GetSet
2、集群访问模式
如果是Redis集群,那么Jedis在客户端初始化时将使用JedisCluster,由于Redis集群下数据是分节点存储的,因此直接访问模式下的部分Redis API将不支持,测试代码如下:
public class JavaStyle { private static JedisCluster jedis; static { Set<HostAndPort> jedisClusterNodes = new HashSet<HostAndPort>(); jedisClusterNodes.add(new HostAndPort("127.0.0.1", 7001)); jedisClusterNodes.add(new HostAndPort("127.0.0.1", 7002)); jedisClusterNodes.add(new HostAndPort("127.0.0.1", 7003)); jedisClusterNodes.add(new HostAndPort("127.0.0.1", 7004)); jedisClusterNodes.add(new HostAndPort("127.0.0.1", 7005)); jedisClusterNodes.add(new HostAndPort("127.0.0.1", 7006)); JedisPoolConfig cfg = new JedisPoolConfig(); cfg.setMaxTotal(500); cfg.setMaxIdle(100); cfg.setMaxWaitMillis(2000); cfg.setTestOnBorrow(true); jedis = new JedisCluster(jedisClusterNodes, cfg); } /*** * TODO API不支持批量 */ @Test public void test() { System.out.println("增加多个键值对:" + jedis.mset("key01", "value01", "key02", "value02")); //命令的时候才会去连接连接对吧 System.out.println("获取多个键值对:" + jedis.mget("key01", "key02", "key03")); System.out.println("获取多个键值对:" + jedis.mget("key01", "key02", "key03", "key04")); } @Test public void testKey2() throws InterruptedException { System.out.println("新增<'username','monkey'>的键值对:" + jedis.set("username", "monkey")); } @Test public void testKey() throws InterruptedException { // System.out.println("清空数据:"+jedis.flushDB()); 不支持 System.out.println("判断某个键是否存在:" + jedis.exists("username")); System.out.println("新增<'username','monkey'>的键值对:" + jedis.set("username", "monkey")); System.out.println("是否存在:" + jedis.exists("name")); System.out.println("新增<'password','password'>的键值对:" + jedis.set("password", "password")); //Set<String> keys = jedis.keys("*"); 不支持 // System.out.println("系统中所有的键如下:"+keys); System.out.println("删除键password:" + jedis.del("password")); System.out.println("判断键password是否存在:" + jedis.exists("password")); System.out.println("设置键username的过期时间为5s:" + jedis.expire("username", 5)); TimeUnit.SECONDS.sleep(2); System.out.println("查看键username的剩余生存时间:" + jedis.ttl("username")); System.out.println("移除键username的生存时间:" + jedis.persist("username")); System.out.println("查看键username的剩余生存时间:" + jedis.ttl("username")); System.out.println("查看键username所存储的值的类型:" + jedis.type("username")); } /*** * 字符串操作 * memcached和redis同样有append的操作,但是memcached有prepend的操作,redis中并没有。 * @throws InterruptedException */ @Test public void testString() throws InterruptedException { //jedis.flushDB(); System.out.println("===========增加数据==========="); System.out.println(jedis.set("key1", "value1")); System.out.println(jedis.set("key2", "value2")); System.out.println(jedis.set("key3", "value3")); System.out.println("删除键key2:" + jedis.del("key2")); System.out.println("获取键key2:" + jedis.get("key2")); System.out.println("修改key1:" + jedis.set("key1", "value1Changed")); System.out.println("获取key1的值:" + jedis.get("key1")); System.out.println("在key3后面加入值:" + jedis.append("key3", "End")); System.out.println("key3的值:" + jedis.get("key3"));//jedis.flushDB(); System.out.println("===========新增键值对防止覆盖原先值=============="); System.out.println(jedis.setnx("key1", "value1")); System.out.println(jedis.setnx("key2", "value2")); System.out.println(jedis.setnx("key2", "value2-new")); System.out.println(jedis.get("key1")); System.out.println(jedis.get("key2")); System.out.println("===========新增键值对并设置有效时间============="); System.out.println(jedis.setex("key3", 2, "value3")); System.out.println(jedis.get("key3")); TimeUnit.SECONDS.sleep(3); System.out.println(jedis.get("key3")); System.out.println("===========获取原值,更新为新值==========");//GETSET is an atomic set this value and return the old value command. System.out.println(jedis.getSet("key2", "key2GetSet")); System.out.println(jedis.get("key2")); System.out.println("获得key2的值的字串:" + jedis.getrange("key2", 2, 4)); } /*** * 整数和浮点数 */ @Test public void testNumber() { //jedis.flushDB(); jedis.set("key1", "1"); jedis.set("key2", "2"); jedis.set("key3", "2.3"); System.out.println("key1的值:" + jedis.get("key1")); System.out.println("key2的值:" + jedis.get("key2")); System.out.println("key1的值加1:" + jedis.incr("key1")); System.out.println("获取key1的值:" + jedis.get("key1")); System.out.println("key2的值减1:" + jedis.decr("key2")); System.out.println("获取key2的值:" + jedis.get("key2")); System.out.println("将key1的值加上整数5:" + jedis.incrBy("key1", 5)); System.out.println("获取key1的值:" + jedis.get("key1")); System.out.println("将key2的值减去整数5:" + jedis.decrBy("key2", 5)); System.out.println("获取key2的值:" + jedis.get("key2")); } /*** * 列表 */ @Test public void testList() { //jedis.flushDB(); System.out.println("===========添加一个list==========="); jedis.lpush("collections", "ArrayList", "Vector", "Stack", "HashMap", "WeakHashMap", "LinkedHashMap"); jedis.lpush("collections", "HashSet"); jedis.lpush("collections", "TreeSet"); jedis.lpush("collections", "TreeMap"); System.out.println("collections的内容:" + jedis.lrange("collections", 0, -1));//-1代表倒数第一个元素,-2代表倒数第二个元素 System.out.println("collections区间0-3的元素:" + jedis.lrange("collections", 0, 3)); System.out.println("==============================="); // 删除列表指定的值 ,第二个参数为删除的个数(有重复时),后add进去的值先被删,类似于出栈 System.out.println("删除指定元素个数:" + jedis.lrem("collections", 2, "HashMap")); System.out.println("collections的内容:" + jedis.lrange("collections", 0, -1)); System.out.println("删除下表0-3区间之外的元素:" + jedis.ltrim("collections", 0, 3)); System.out.println("collections的内容:" + jedis.lrange("collections", 0, -1)); System.out.println("collections列表出栈(左端):" + jedis.lpop("collections")); System.out.println("collections的内容:" + jedis.lrange("collections", 0, -1)); System.out.println("collections添加元素,从列表右端,与lpush相对应:" + jedis.rpush("collections", "EnumMap")); System.out.println("collections的内容:" + jedis.lrange("collections", 0, -1)); System.out.println("collections列表出栈(右端):" + jedis.rpop("collections")); System.out.println("collections的内容:" + jedis.lrange("collections", 0, -1)); System.out.println("修改collections指定下标1的内容:" + jedis.lset("collections", 1, "LinkedArrayList")); System.out.println("collections的内容:" + jedis.lrange("collections", 0, -1)); System.out.println("==============================="); System.out.println("collections的长度:" + jedis.llen("collections")); System.out.println("获取collections下标为2的元素:" + jedis.lindex("collections", 2)); System.out.println("==============================="); jedis.lpush("sortedList", "3", "6", "2", "0", "7", "4"); System.out.println("sortedList排序前:" + jedis.lrange("sortedList", 0, -1)); System.out.println(jedis.sort("sortedList")); System.out.println("sortedList排序后:" + jedis.lrange("sortedList", 0, -1)); } /*** * set集合 */ @Test public void testSet() { //jedis.flushDB(); System.out.println("============向集合中添加元素============"); System.out.println(jedis.sadd("eleSet", "e1", "e2", "e4", "e3", "e0", "e8", "e7", "e5")); System.out.println(jedis.sadd("eleSet", "e6")); System.out.println(jedis.sadd("eleSet", "e6")); System.out.println("eleSet的所有元素为:" + jedis.smembers("eleSet")); System.out.println("删除一个元素e0:" + jedis.srem("eleSet", "e0")); System.out.println("eleSet的所有元素为:" + jedis.smembers("eleSet")); System.out.println("删除两个元素e7和e6:" + jedis.srem("eleSet", "e7", "e6")); System.out.println("eleSet的所有元素为:" + jedis.smembers("eleSet")); System.out.println("随机的移除集合中的一个元素:" + jedis.spop("eleSet")); System.out.println("随机的移除集合中的一个元素:" + jedis.spop("eleSet")); System.out.println("eleSet的所有元素为:" + jedis.smembers("eleSet")); System.out.println("eleSet中包含元素的个数:" + jedis.scard("eleSet")); System.out.println("e3是否在eleSet中:" + jedis.sismember("eleSet", "e3")); System.out.println("e1是否在eleSet中:" + jedis.sismember("eleSet", "e1")); System.out.println("e1是否在eleSet中:" + jedis.sismember("eleSet", "e5")); System.out.println("================================="); System.out.println(jedis.sadd("eleSet1", "e1", "e2", "e4", "e3", "e0", "e8", "e7", "e5")); System.out.println(jedis.sadd("eleSet2", "e1", "e2", "e4", "e3", "e0", "e8")); // System.out.println("将eleSet1中删除e1并存入eleSet3中:"+jedis.smove("eleSet1", "eleSet3", "e1")); // System.out.println("将eleSet1中删除e2并存入eleSet3中:"+jedis.smove("eleSet1", "eleSet3", "e2")); System.out.println("eleSet1中的元素:" + jedis.smembers("eleSet1")); System.out.println("eleSet3中的元素:" + jedis.smembers("eleSet3")); System.out.println("============集合运算================="); System.out.println("eleSet1中的元素:" + jedis.smembers("eleSet1")); System.out.println("eleSet2中的元素:" + jedis.smembers("eleSet2")); // System.out.println("eleSet1和eleSet2的交集:"+jedis.sinter("eleSet1","eleSet2")); //System.out.println("eleSet1和eleSet2的并集:"+jedis.sunion("eleSet1","eleSet2")); // System.out.println("eleSet1和eleSet2的差集:"+jedis.sdiff("eleSet1","eleSet2"));//eleSet1中有,eleSet2中没有 } /*** * 散列 */ @Test public void testHash() { //jedis.flushDB(); Map<String, String> map = new HashMap<String, String>(); map.put("key1", "value1"); map.put("key2", "value2"); map.put("key3", "value3"); map.put("key4", "value4"); jedis.hmset("hash", map); jedis.hset("hash", "key5", "value5"); System.out.println("散列hash的所有键值对为:" + jedis.hgetAll("hash"));//return Map<String,String> System.out.println("散列hash的所有键为:" + jedis.hkeys("hash"));//return Set<String> System.out.println("散列hash的所有值为:" + jedis.hvals("hash"));//return List<String> System.out.println("将key6保存的值加上一个整数,如果key6不存在则添加key6:" + jedis.hincrBy("hash", "key6", 6)); System.out.println("散列hash的所有键值对为:" + jedis.hgetAll("hash")); System.out.println("将key6保存的值加上一个整数,如果key6不存在则添加key6:" + jedis.hincrBy("hash", "key6", 3)); System.out.println("散列hash的所有键值对为:" + jedis.hgetAll("hash")); System.out.println("删除一个或者多个键值对:" + jedis.hdel("hash", "key2")); System.out.println("散列hash的所有键值对为:" + jedis.hgetAll("hash")); System.out.println("散列hash中键值对的个数:" + jedis.hlen("hash")); System.out.println("判断hash中是否存在key2:" + jedis.hexists("hash", "key2")); System.out.println("判断hash中是否存在key3:" + jedis.hexists("hash", "key3")); System.out.println("获取hash中的值:" + jedis.hmget("hash", "key3")); System.out.println("获取hash中的值:" + jedis.hmget("hash", "key3", "key4")); } @Test public void testSortedSet() { //jedis.flushDB(); Map<String, Double> map = new HashMap<String, Double>(); map.put("key2", 1.2); map.put("key3", 4.0); map.put("key4", 5.0); map.put("key5", 0.2); System.out.println(jedis.zadd("zset", 3, "key1")); System.out.println(jedis.zadd("zset", map)); System.out.println("zset中的所有元素:" + jedis.zrange("zset", 0, -1)); System.out.println("zset中的所有元素:" + jedis.zrangeWithScores("zset", 0, -1)); System.out.println("zset中的所有元素:" + jedis.zrangeByScore("zset", 0, 100)); System.out.println("zset中的所有元素:" + jedis.zrangeByScoreWithScores("zset", 0, 100)); System.out.println("zset中key2的分值:" + jedis.zscore("zset", "key2")); System.out.println("zset中key2的排名:" + jedis.zrank("zset", "key2")); System.out.println("删除zset中的元素key3:" + jedis.zrem("zset", "key3")); System.out.println("zset中的所有元素:" + jedis.zrange("zset", 0, -1)); System.out.println("zset中元素的个数:" + jedis.zcard("zset")); System.out.println("zset中分值在1-4之间的元素的个数:" + jedis.zcount("zset", 1, 4)); System.out.println("key2的分值加上5:" + jedis.zincrby("zset", 5, "key2")); System.out.println("key3的分值加上4:" + jedis.zincrby("zset", 4, "key3")); System.out.println("zset中的所有元素:" + jedis.zrange("zset", 0, -1)); } @Test public void testSort() { //jedis.flushDB(); jedis.lpush("collections", "ArrayList", "Vector", "Stack", "HashMap", "WeakHashMap", "LinkedHashMap"); System.out.println("collections的内容:" + jedis.lrange("collections", 0, -1)); SortingParams sortingParameters = new SortingParams(); System.out.println(jedis.sort("collections", sortingParameters.alpha())); System.out.println("==============================="); jedis.lpush("sortedList", "3", "6", "2", "0", "7", "4"); System.out.println("sortedList排序前:" + jedis.lrange("sortedList", 0, -1)); System.out.println("升序:" + jedis.sort("sortedList", sortingParameters.asc())); System.out.println("升序:" + jedis.sort("sortedList", sortingParameters.desc())); System.out.println("==============================="); jedis.lpush("userlist", "33"); jedis.lpush("userlist", "22"); jedis.lpush("userlist", "55"); jedis.lpush("userlist", "11"); jedis.hset("user:66", "name", "66"); jedis.hset("user:55", "name", "55"); jedis.hset("user:33", "name", "33"); jedis.hset("user:22", "name", "79"); jedis.hset("user:11", "name", "24"); jedis.hset("user:11", "add", "beijing"); jedis.hset("user:22", "add", "shanghai"); jedis.hset("user:33", "add", "guangzhou"); jedis.hset("user:55", "add", "chongqing"); jedis.hset("user:66", "add", "xi'an"); sortingParameters = new SortingParams(); sortingParameters.get("user:*->name"); sortingParameters.get("user:*->add"); System.out.println(jedis.sort("userlist", sortingParameters)); } }
测试结果如下:
判断某个键是否存在:false 新增<'username','monkey'>的键值对:OK 是否存在:false 新增<'password','password'>的键值对:OK 删除键password:1 判断键password是否存在:false 设置键username的过期时间为5s:1 查看键username的剩余生存时间:3 移除键username的生存时间:1 查看键username的剩余生存时间:-1 查看键username所存储的值的类型:string ============向集合中添加元素============ 8 1 0 eleSet的所有元素为:[e1, e7, e5, e3, e0, e2, e8, e4, e6] 删除一个元素e0:1 eleSet的所有元素为:[e5, e3, e2, e8, e4, e7, e1, e6] 删除两个元素e7和e6:2 eleSet的所有元素为:[e8, e4, e1, e3, e2, e5] 随机的移除集合中的一个元素:e3 随机的移除集合中的一个元素:e4 eleSet的所有元素为:[e1, e2, e8, e5] eleSet中包含元素的个数:4 e3是否在eleSet中:false e1是否在eleSet中:true e1是否在eleSet中:true ================================= 8 6 eleSet1中的元素:[e4, e1, e7, e5, e3, e0, e2, e8] eleSet3中的元素:[] ============集合运算================= eleSet1中的元素:[e4, e1, e7, e5, e3, e0, e2, e8] eleSet2中的元素:[e2, e1, e4, e3, e0, e8] 散列hash的所有键值对为:{key1=value1, key2=value2, key5=value5, key3=value3, key4=value4} 散列hash的所有键为:[key1, key2, key5, key3, key4] 散列hash的所有值为:[value3, value1, value4, value2, value5] 将key6保存的值加上一个整数,如果key6不存在则添加key6:6 散列hash的所有键值对为:{key1=value1, key2=value2, key5=value5, key6=6, key3=value3, key4=value4} 将key6保存的值加上一个整数,如果key6不存在则添加key6:9 散列hash的所有键值对为:{key1=value1, key2=value2, key5=value5, key6=9, key3=value3, key4=value4} 删除一个或者多个键值对:1 散列hash的所有键值对为:{key1=value1, key5=value5, key6=9, key3=value3, key4=value4} 散列hash中键值对的个数:5 判断hash中是否存在key2:false 判断hash中是否存在key3:true 获取hash中的值:[value3] 获取hash中的值:[value3, value4] 新增<'username','monkey'>的键值对:OK ===========添加一个list=========== collections的内容:[TreeMap, TreeSet, HashSet, LinkedHashMap, WeakHashMap, HashMap, Stack, Vector, ArrayList] collections区间0-3的元素:[TreeMap, TreeSet, HashSet, LinkedHashMap] =============================== 删除指定元素个数:1 collections的内容:[TreeMap, TreeSet, HashSet, LinkedHashMap, WeakHashMap, Stack, Vector, ArrayList] 删除下表0-3区间之外的元素:OK collections的内容:[TreeMap, TreeSet, HashSet, LinkedHashMap] collections列表出栈(左端):TreeMap collections的内容:[TreeSet, HashSet, LinkedHashMap] collections添加元素,从列表右端,与lpush相对应:4 collections的内容:[TreeSet, HashSet, LinkedHashMap, EnumMap] collections列表出栈(右端):EnumMap collections的内容:[TreeSet, HashSet, LinkedHashMap] 修改collections指定下标1的内容:OK collections的内容:[TreeSet, LinkedArrayList, LinkedHashMap] =============================== collections的长度:3 获取collections下标为2的元素:LinkedHashMap =============================== sortedList排序前:[4, 7, 0, 2, 6, 3] [0, 2, 3, 4, 6, 7] sortedList排序后:[4, 7, 0, 2, 6, 3] collections的内容:[LinkedHashMap, WeakHashMap, HashMap, Stack, Vector, ArrayList, TreeSet, LinkedArrayList, LinkedHashMap] [ArrayList, HashMap, LinkedArrayList, LinkedHashMap, LinkedHashMap, Stack, TreeSet, Vector, WeakHashMap] =============================== sortedList排序前:[4, 7, 0, 2, 6, 3, 4, 7, 0, 2, 6, 3] 升序:[0, 0, 2, 2, 3, 3, 4, 4, 6, 6, 7, 7] 升序:[7, 7, 6, 6, 4, 4, 3, 3, 2, 2, 0, 0] =============================== redis.clients.jedis.exceptions.JedisDataException: ERR GET option of SORT denied in Cluster mode. ... ... redis.clients.jedis.exceptions.JedisClusterException: No way to dispatch this command to Redis Cluster because keys have different slots. ... ... 1 4 zset中的所有元素:[key5, key2, key1, key3, key4] zset中的所有元素:[[[107, 101, 121, 53],0.2], [[107, 101, 121, 50],1.2], [[107, 101, 121, 49],3.0], [[107, 101, 121, 51],4.0], [[107, 101, 121, 52],5.0]] zset中的所有元素:[key5, key2, key1, key3, key4] zset中的所有元素:[[[107, 101, 121, 53],0.2], [[107, 101, 121, 50],1.2], [[107, 101, 121, 49],3.0], [[107, 101, 121, 51],4.0], [[107, 101, 121, 52],5.0]] zset中key2的分值:1.2 zset中key2的排名:1 删除zset中的元素key3:1 zset中的所有元素:[key5, key2, key1, key4] zset中元素的个数:4 zset中分值在1-4之间的元素的个数:2 key2的分值加上5:6.2 key3的分值加上4:4.0 zset中的所有元素:[key5, key1, key3, key4, key2] key1的值:1 key2的值:2 key1的值加1:2 获取key1的值:2 key2的值减1:1 获取key2的值:1 将key1的值加上整数5:7 获取key1的值:7 将key2的值减去整数5:-4 获取key2的值:-4 ===========增加数据=========== OK OK OK 删除键key2:1 获取键key2:null 修改key1:OK 获取key1的值:value1Changed 在key3后面加入值:9 key3的值:value3End ===========新增键值对防止覆盖原先值============== 0 1 0 value1Changed value2 ===========新增键值对并设置有效时间============= OK value3 null ===========获取原值,更新为新值========== value2 key2GetSet 获得key2的值的字串:y2G
对于集群访问模式们也可以使用Spring配置文件自动导入,代码如下:
@RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration(locations = {"/application.xml"}) public class SpringStyle { @Autowired JedisCluster jedis; @Test public void testKey() throws InterruptedException { // System.out.println("清空数据:"+jedis.flushDB()); System.out.println("判断某个键是否存在:"+jedis.exists("username")); System.out.println("新增<'username','wukong'>的键值对:"+jedis.set("username", "wukong")); System.out.println("是否存在:"+jedis.exists("name")); System.out.println("新增<'password','password'>的键值对:"+jedis.set("password", "password")); //Set<String> keys = jedis.keys("*"); // System.out.println("系统中所有的键如下:"+keys); System.out.println("删除键password:"+jedis.del("password")); System.out.println("判断键password是否存在:"+jedis.exists("password")); System.out.println("设置键username的过期时间为5s:"+jedis.expire("username", 5)); TimeUnit.SECONDS.sleep(2); System.out.println("查看键username的剩余生存时间:"+jedis.ttl("username")); System.out.println("移除键username的生存时间:"+jedis.persist("username")); System.out.println("查看键username的剩余生存时间:"+jedis.ttl("username")); System.out.println("查看键username所存储的值的类型:"+jedis.type("username")); } /*** * 字符串操作 * memcached和redis同样有append的操作,但是memcached有prepend的操作,redis中并没有。 * @throws InterruptedException */ @Test public void testString() throws InterruptedException { //jedis.flushDB(); System.out.println("===========增加数据==========="); System.out.println(jedis.set("key1","value1")); System.out.println(jedis.set("key2","value2")); System.out.println(jedis.set("key3", "value3")); System.out.println("删除键key2:"+jedis.del("key2")); System.out.println("获取键key2:"+jedis.get("key2")); System.out.println("修改key1:"+jedis.set("key1", "value1Changed")); System.out.println("获取key1的值:"+jedis.get("key1")); System.out.println("在key3后面加入值:"+jedis.append("key3", "End")); System.out.println("key3的值:"+jedis.get("key3"));//jedis.flushDB(); System.out.println("===========新增键值对防止覆盖原先值=============="); System.out.println(jedis.setnx("key1", "value1")); System.out.println(jedis.setnx("key2", "value2")); System.out.println(jedis.setnx("key2", "value2-new")); System.out.println(jedis.get("key1")); System.out.println(jedis.get("key2")); System.out.println("===========新增键值对并设置有效时间============="); System.out.println(jedis.setex("key3", 2, "value3")); System.out.println(jedis.get("key3")); TimeUnit.SECONDS.sleep(3); System.out.println(jedis.get("key3")); System.out.println("===========获取原值,更新为新值==========");//GETSET is an atomic set this value and return the old value command. System.out.println(jedis.getSet("key2", "key2GetSet")); System.out.println(jedis.get("key2")); System.out.println("获得key2的值的字串:"+jedis.getrange("key2", 2, 4)); } }
配置文件如下:
<?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.xsd"> <bean id="jedisPoolConfig" class="redis.clients.jedis.JedisPoolConfig"> <property name="maxTotal" value="500"></property> <property name="maxIdle" value="100"></property> <property name="maxWaitMillis" value="2000"></property> <property name="testOnBorrow" value="true"></property> </bean> <bean id="hostAndPort1" 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 id="hostAndPort2" 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 id="hostAndPort3" class="redis.clients.jedis.HostAndPort"> <constructor-arg name="host" value="127.0.0.1"></constructor-arg> <constructor-arg name="port" value="7003"></constructor-arg> </bean> <bean id="hostAndPort4" class="redis.clients.jedis.HostAndPort"> <constructor-arg name="host" value="127.0.0.1"></constructor-arg> <constructor-arg name="port" value="7004"></constructor-arg> </bean> <bean id="hostAndPort5" class="redis.clients.jedis.HostAndPort"> <constructor-arg name="host" value="192.168.0.13"></constructor-arg> <constructor-arg name="port" value="7005"></constructor-arg> </bean> <bean id="hostAndPort6" class="redis.clients.jedis.HostAndPort"> <constructor-arg name="host" value="192.168.0.13"></constructor-arg> <constructor-arg name="port" value="7006"></constructor-arg> </bean> <bean id="redisCluster" class="redis.clients.jedis.JedisCluster"> <constructor-arg name="nodes"> <set> <ref bean="hostAndPort1"></ref> <ref bean="hostAndPort2"></ref> <ref bean="hostAndPort3"></ref> <ref bean="hostAndPort4"></ref> <ref bean="hostAndPort5"></ref> <ref bean="hostAndPort6"></ref> </set> </constructor-arg> <constructor-arg name="poolConfig"> <ref bean="jedisPoolConfig"></ref> </constructor-arg> </bean> </beans>
测试结果如下:
===========增加数据===========
OK
OK
OK
删除键key2:1
获取键key2:null
修改key1:OK
获取key1的值:value1Changed
在key3后面加入值:9
key3的值:value3End
===========新增键值对防止覆盖原先值==============
0
1
0
value1Changed
value2
===========新增键值对并设置有效时间=============
OK
value3
null
===========获取原值,更新为新值==========
value2
key2GetSet
获得key2的值的字串:y2G
3、Redis数据库监控
我们还可以通过Jedis客户端对数据库进行监控,代码如下:
public class RedisMonitor { static class MonitorTask implements Runnable { private Jedis jedis; public MonitorTask(Jedis jedis) { this.jedis = jedis; } @Override public void run() { jedis.monitor(new JedisMonitor() { @Override public void onCommand(String command) { System.out.println(command); } }); } } public static void main(String[] args) { MonitorTask monitorTask = new MonitorTask(new Jedis("127.0.0.1", 6379)); new Thread(monitorTask).start(); } }
当我们后台用命令进行Redis数据库访问时,会打印具体日志,如:
1586284459.902139 [0 127.0.0.1:61929] "COMMAND" 1586284479.140059 [0 127.0.0.1:61929] "set" "key1" "value1" 1586284486.786536 [0 127.0.0.1:61929] "get" "key1"
可以用作本地开发测试或者用于数据库监控。
二、Jedis源码原理分析
在Redis的使用过程中,大多数人都是使用现成的客户端,如Jedis,Redisson,Lettuce。因此本文研究用BIO的方式手写Redis客户端尝试,对Jedis进行源码及原理探究。由于篇幅问题,此处内容请转到:Redis学习之Jedis源码原理分析探究(BIO手写Jedis客户端)