Redis入门——Java接口
1、 maven配置
<dependency> <groupId>redis.clients</groupId> <artifactId>jedis</artifactId> <version>2.9.0</version> </dependency>
2、 Java操作Redis数据接口
package com.coshaho.learn.redis; import java.util.HashMap; import java.util.Iterator; import java.util.List; import java.util.Map; import redis.clients.jedis.Jedis; /** * * MyRedisLearn.java Create on 2017年11月4日 下午4:40:39 * * 类功能说明: Redis Java接口测试 * * Copyright: Copyright(c) 2013 * Company: COSHAHO * @Version 1.0 * @Author coshaho */ public class MyRedisLearn { private Jedis jedis; public static void main(String[] args) { MyRedisLearn redis = new MyRedisLearn(); redis.init(); redis.testString(); redis.testMap(); redis.testList(); redis.testSet(); } public void init() { jedis = new Jedis("127.0.0.1", 6379); jedis.auth("coshaho"); } public void testString() { // 设置值 jedis.del("string1"); jedis.set("string1","coshaho"); System.out.println(jedis.get("string1")); // 字符串拼接 jedis.append("string1", " is my name"); //拼接 System.out.println(jedis.get("string1")); // 删除字符串 jedis.del("string1"); System.out.println(jedis.get("string1")); // 设置多个键值对 jedis.del("name"); jedis.del("age"); jedis.mset("name","coshaho","age","28"); // 加1操作 jedis.incr("age"); System.out.println(jedis.get("name") + "-" + jedis.get("age")); } public void testMap() { jedis.del("user"); Map<String, String> map = new HashMap<String, String>(); map.put("name", "coshaho"); map.put("age", "28"); map.put("sex", "male"); jedis.hmset("user",map); // 参数1 key 参数2 filed 参数3 field List<String> rsmap = jedis.hmget("user", "name", "age", "sex"); System.out.println(rsmap); // 删除map中的某个键值 jedis.hdel("user","age"); System.out.println(jedis.hmget("user", "age")); System.out.println(jedis.hlen("user")); System.out.println(jedis.exists("user")); System.out.println(jedis.hkeys("user")); System.out.println(jedis.hvals("user")); Iterator<String> iter=jedis.hkeys("user").iterator(); while (iter.hasNext()) { String key = iter.next(); System.out.println(key+":"+jedis.hmget("user",key)); } } public void testList() { // 删除list jedis.del("language"); System.out.println(jedis.lrange("language",0,-1)); jedis.lpush("language","english"); jedis.lpush("language","chinese"); jedis.lpush("language","japanese"); // 第一个是key,第二个是起始位置,第三个是结束位置,jedis.llen获取长度 -1表示取得所有 System.out.println(jedis.lrange("language",0,-1)); jedis.del("language"); jedis.rpush("language","java"); jedis.rpush("language","c"); jedis.rpush("language","python"); System.out.println(jedis.lrange("language",0,-1)); // 双向列表,jedis 排序 jedis.del("a"); jedis.rpush("a", "1"); jedis.lpush("a","6"); jedis.lpush("a","3"); jedis.lpush("a","9"); System.out.println(jedis.lrange("a",0,-1)); System.out.println(jedis.sort("a")); System.out.println(jedis.lrange("a",0,-1)); } public void testSet() { jedis.del("b"); jedis.sadd("b","张三"); jedis.sadd("b","李四"); jedis.sadd("b","王五"); jedis.sadd("b","胜七"); jedis.sadd("b","段九"); // 移除 jedis.srem("b","胜七"); System.out.println(jedis.smembers("b")); System.out.println(jedis.sismember("b", "胜七")); System.out.println(jedis.srandmember("b")); System.out.println(jedis.scard("b")); } }
3、 Java创建Redis连接池
package com.coshaho.learn.redis; import redis.clients.jedis.Jedis; import redis.clients.jedis.JedisPool; import redis.clients.jedis.JedisPoolConfig; public final class RedisPool { //Redis服务器IP private static String ADDR = "127.0.0.1"; //Redis的端口号 private static int PORT = 6379; //访问密码 private static String AUTH = "coshaho"; //可用连接实例的最大数目,默认值为8; //如果赋值为-1,则表示不限制;如果pool已经分配了MAX_TOTAL个jedis实例,则此时pool的状态为exhausted(耗尽)。 private static int MAX_TOTAL = 1024; //控制一个pool最多有多少个状态为idle(空闲的)的jedis实例,默认值也是8。 private static int MAX_IDLE = 200; //等待可用连接的最大时间,单位毫秒,默认值为-1,表示永不超时。如果超过等待时间,则直接抛出JedisConnectionException; private static int MAX_WAIT = 10000; private static int TIMEOUT = 10000; //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; private static boolean TEST_ON_BORROW = true; private static JedisPool jedisPool = null; /** * 初始化Redis连接池 */ static { try { JedisPoolConfig config = new JedisPoolConfig(); config.setMaxIdle(MAX_IDLE); config.setTestOnBorrow(TEST_ON_BORROW); config.setMaxTotal(MAX_TOTAL); config.setMaxWaitMillis(MAX_WAIT); jedisPool = new JedisPool(config, ADDR, PORT, TIMEOUT, AUTH); } catch (Exception e) { e.printStackTrace(); } } /** * 获取Jedis实例 * @return */ public synchronized static Jedis getJedis() { try { if (jedisPool != null) { Jedis resource = jedisPool.getResource(); return resource; } else { return null; } } catch (Exception e) { e.printStackTrace(); return null; } } /** * 释放jedis资源 * @param jedis */ public static void close(final Jedis jedis) { if (jedis != null) { jedis.close();; } } public static void main(String[] args) { RedisPool.getJedis().set("pool", "连接池"); System.out.println(RedisPool.getJedis().get("pool")); } }