java中的redis常用操作
常规操作
public class TestReidsCommon { ? public static void main(String[] args) { // 创建连接 Jedis jedis = new Jedis("192.168.120.129", 6379); // 设置密码 如果没有密码可以不设置 jedis.auth("123456"); // key Set<String> keys = jedis.keys("*"); for (Iterator<String> iterator = keys.iterator(); iterator.hasNext();) { String key = (String) iterator.next(); System.out.println(key); } System.out.println("jedis.exists====>" + jedis.exists("k2")); System.out.println(jedis.ttl("k1")); // String // jedis.append("k1","myreids"); System.out.println(jedis.get("k1")); jedis.set("k4", "k4_redis"); System.out.println("----------------------------------------"); jedis.mset("str1", "v1", "str2", "v2", "str3", "v3"); System.out.println(jedis.mget("str1", "str2", "str3")); // list System.out.println("----------------------------------------"); // jedis.lpush("mylist","v1","v2","v3","v4","v5"); List<String> list = jedis.lrange("mylist", 0, -1); for (String element : list) { System.out.println(element); } // set jedis.sadd("orders", "jd001"); jedis.sadd("orders", "jd002"); jedis.sadd("orders", "jd003"); Set<String> set1 = jedis.smembers("orders"); for (Iterator<String> iterator = set1.iterator(); iterator.hasNext();) { String string = (String) iterator.next(); System.out.println(string); } jedis.srem("orders", "jd002"); System.out.println(jedis.smembers("orders").size()); // hash jedis.hset("hash1", "userName", "lisi"); System.out.println(jedis.hget("hash1", "userName")); Map<String, String> map = new HashMap<String, String>(); map.put("telphone", "15902738715"); map.put("address", "whsxt"); map.put("email", ""); jedis.hmset("hash2", map); List<String> result = jedis.hmget("hash2", "telphone", "email"); for (String element : result) { System.out.println(element); } // zset jedis.zadd("zset01", 60d, "v1"); jedis.zadd("zset01", 70d, "v2"); jedis.zadd("zset01", 80d, "v3"); jedis.zadd("zset01", 90d, "v4"); ? Set<String> s1 = jedis.zrange("zset01", 0, -1); for (Iterator<String> iterator = s1.iterator(); iterator.hasNext();) { String string = (String) iterator.next(); System.out.println(string); } jedis.close(); } } 2.3,事务提交 常规操作 public class TestReidsTranaction { ? public static void main(String[] args) { // 创建连接 Jedis jedis = new Jedis("192.168.120.129", 6379); // 设置密码 如果没有密码可以不设置 jedis.auth("123456"); //监控key,如果该动了事务就被放弃 /*3 jedis.watch("serialNum"); jedis.set("serialNum","s#####################"); jedis.unwatch();*/ Transaction transaction = jedis.multi();//被当作一个命令进行执行 Response<String> response = transaction.get("serialNum"); transaction.set("serialNum","s002"); response = transaction.get("serialNum"); transaction.lpush("list3","a"); transaction.lpush("list3","b"); transaction.lpush("list3","c"); transaction.exec(); //2 transaction.discard(); System.out.println("serialNum***********"+response.get()); jedis.close(); ? } ? } ? 加锁操作 public class TestReidsTranactionLock { ? public boolean transMethod() { // 创建连接 Jedis jedis = new Jedis("192.168.120.129", 6379); // 设置密码 如果没有密码可以不设置 jedis.auth("123456"); int balance;// 可用余额 int debt;// 欠额 int amtToSubtract = 10;// 实刷额度 ? jedis.watch("balance"); // jedis.set("balance","5");//此句不该出现,讲课方便。模拟其他程序已经修改了该条目 balance = Integer.parseInt(jedis.get("balance")); if (balance < amtToSubtract) { jedis.unwatch(); System.out.println("modify"); jedis.close(); return false; } else { System.out.println("***********transaction"); Transaction transaction = jedis.multi(); transaction.decrBy("balance", amtToSubtract); transaction.incrBy("debt", amtToSubtract); transaction.exec(); balance = Integer.parseInt(jedis.get("balance")); debt = Integer.parseInt(jedis.get("debt")); System.out.println("*******" + balance); System.out.println("*******" + debt); jedis.close(); return true; } } ? /** * 通俗点讲,watch命令就是标记一个键,如果标记了一个键, 在提交事务前如果该键被别人修改过,那事务就会失败,这种情况通常可以在程序中 重新再尝试一次。 * 首先标记了键balance,然后检查余额是否足够,不足就取消标记,并不做扣减; 足够的话,就启动事务进行更新操作, * 如果在此期间键balance被其它人修改, 那在提交事务(执行exec)时就会报错, 程序中通常可以捕获这类错误再重新执行一次,直到成功。 */ public static void main(String[] args) { TestReidsTranactionLock test = new TestReidsTranactionLock(); boolean retValue = test.transMethod(); System.out.println("main retValue-------: " + retValue); } ? } 2.4,主从复制 public class TestReidsMS { ? public static void main(String[] args) throws InterruptedException { // 创建连接 Jedis jedis_M = new Jedis("192.168.120.129", 6379); Jedis jedis_S = new Jedis("192.168.120.129", 6380); ? jedis_S.slaveof("127.0.0.1", 6379); ? jedis_M.set("k6", "v6"); ? Thread.sleep(500); System.out.println(jedis_S.get("k6")); jedis_M.close(); jedis_S.close(); } ? }
相关推荐
聚合室 2020-11-16
零 2020-09-18
afanti 2020-09-16
Lzs 2020-10-23
Justhavefun 2020-10-22
jacktangj 2020-10-14
ChaITSimpleLove 2020-10-06
Andrea0 2020-09-18
周游列国之仕子 2020-09-15
88234852 2020-09-15
YClimb 2020-09-15
风雨断肠人 2020-09-04
卖口粥湛蓝的天空 2020-09-15
stulen 2020-09-15
pythonxuexi 2020-09-06
abfdada 2020-08-26
梦的天空 2020-08-25