Jedis是java调用Redis的接口。
一。Maven中的jedis依赖包
1 <!-- https://mvnrepository.com/artifact/redis.clients/jedis --> 2 <dependency> 3 <groupId>redis.clients</groupId> 4 <artifactId>jedis</artifactId> 5 <version>2.9.0</version> 6 </dependency>
二。配置redis.properties.xml
1 # *************** jedis connection parameters setting ************** # 2 # redis server ip # 3 redis.ip=127.0.0.1 4 # redis server port # 5 redis.port=6379 6 # password 7 redis.password=redis123 8 9 # *************** jedis pool parameters setting ************** # 10 # jedis's max connected objects # 11 redis.pool.maxTotal=1000 12 # jedis's max saved idel objects # 13 redis.pool.maxIdle=10 14 # jedis's max waiting time when no object returnd # 15 redis.pool.maxWaitMillis=5000 16 # whether test when jedis is calling borrowObject() # 17 redis.pool.testOnBorrow=true 18 # whether test when jedis is calling returnObject() # 19 redis.pool.testOnReturn=true
三。编写JAVA类获取Jedis连接池
1 import redis.clients.jedis.Jedis; 2 import redis.clients.jedis.JedisPool; 3 import redis.clients.jedis.JedisPoolConfig; 4 5 import java.io.IOException; 6 import java.util.Properties; 7 8 /** 9 * Created by XA on 2017/11/6. 10 */ 11 public class MyJedisPool { 12 13 private volatile static JedisPool pool; 14 private static Jedis jedis; 15 16 private static JedisPool getJedisPool() { 17 if(pool==null) { 18 synchronized (MyJedisPool.class) { 19 if(pool==null) { 20 try{ 21 Properties props = new Properties(); 22 props.load(MyJedisPool.class.getClassLoader().getResourceAsStream("config/redis.properties")); 23 // create jedis pool instance 24 JedisPoolConfig config = new JedisPoolConfig(); 25 // set property items of jedis pool 26 config.setMaxTotal(Integer.valueOf(props.getProperty("redis.pool.maxTotal"))); 27 config.setMaxIdle(Integer.valueOf(props.getProperty("redis.pool.maxIdle"))); 28 config.setMaxWaitMillis(Integer.valueOf(props.getProperty("redis.pool.maxWaitMillis"))); 29 config.setTestOnBorrow(Boolean.valueOf(props.getProperty("redis.pool.testOnBorrow"))); 30 config.setTestOnReturn(Boolean.valueOf(props.getProperty("redis.pool.testOnReturn"))); 31 // instance 32 pool = new JedisPool(config, props.getProperty("redis.ip"), Integer.valueOf(props.getProperty("redis.port")), 5000, props.getProperty("redis.password")); 33 34 }catch (IOException e) { 35 e.printStackTrace(); 36 } 37 } 38 } 39 } 40 return pool; 41 } 42 43 // get jedis 44 public static Jedis getJedis() { 45 return getJedisPool().getResource(); 46 } 47 48 // recycle jedis 49 public synchronized static void recycleJedis(Jedis jedis) { 50 if(jedis!=null) { 51 jedis.close(); 52 } 53 } 54 }
四。使用jedis的常用示例
public static void main(String[] args){ try{ Jedis jedis = MyJedisPool.getJedis(); Set<String> keys = jedis.keys("*"); System.out.println(keys.size()); }catch (Exception e) { e.printStackTrace(); }finally { MyJedisPool.recycleJedis(jedis); } }
注意：1. 不要忘记调用recycleJedis()回收jedis示例
2. 实际调用recycleJedis()后发现，jedis仍然有效。原因暂时未知。
五。使用反射和泛型封装jedis的申请和回收
1 @SuppressWarnings("unchecked") 2 public static <T> T invokeJedisMethod(String methodName, Object[] args) { 3 Jedis jedis = MyJedisPool.getJedis(); 4 5 T returnObject = null; 6 try { 7 Class[] argsTypes = new Class[args.length]; 8 for (int i = 0; i < args.length; i++) { 9 Class argClazz = args[i].getClass(); 10 if (argClazz.equals(HashMap.class)) { 11 argsTypes[i] = Map.class; 12 } else { 13 argsTypes[i] = argClazz; 14 } 15 16 } 17 Method method = jedis.getClass().getDeclaredMethod(methodName, argsTypes); 18 19 returnObject = (T) method.invoke(jedis, args); 20 } catch (Exception e) { 21 System.out.print(e.getStackTrace()[1].getClassName() + " --> " + 22 e.getStackTrace()[1].getMethodName() + " --> " + 23 e.getClass().getName() + "\n"); 24 e.printStackTrace(); 25 } finally { 26 MyJedisPool.recycleJedis(jedis); 27 } 28 return returnObject; 29 }
运行测试：
1 import org.junit.Assert; 2 import org.junit.Test; 3 import org.springframework.test.annotation.Rollback; 4 import org.springframework.transaction.annotation.Transactional; 5 6 import java.util.HashMap; 7 import java.util.List; 8 import java.util.Map; 9 import java.util.Set; 10 11 public class JedisServiceTest { 12 13 public enum CommonAPI { 14 // keys 15 keys("keys", 1), del("del", 20), exists("exists", 22), 16 // hash 17 hget("hget", 2), hgetAll("hgetAll", 3), hset("hset", 4), hmset("hmset", 5), hlen("hlen", 6), hexists("hexists", 7), hdel("hdel", 8), hkeys("hkeys", 9), hmget("hmget", 23), 18 // zsort 19 zadd("zadd", 10), zrem("zrem", 11), zrange("zrange", 12), zcard("zcard", 13), zcount("zcount", 14), 20 // list 21 linsert("linsert", 15), llen("llen", 16), lpop("lpop", 17), lpush("lpush", 18), lrange("lrange", 19), 22 // sub-pub 23 subscribe("subscribe", 21); 24 25 private String name; 26 private int index; 27 28 CommonAPI(String name, int index) { 29 this.name = name; 30 this.index = index; 31 } 32 33 public String getName() { 34 return name; 35 } 36 } 37 38 /** 39 * 事务回滚无效，redis并不支持可回滚的事务 40 */ 41 @Test 42 @Transactional 43 @Rollback 44 public void invokeJedisMethod() { 45 46 // 1 47 JedisService.invokeJedisMethod(JedisService.CommonAPI.hset.getName(), new Object[]{"key1", "hkey1", "value1"}); 48 Assert.assertTrue(JedisService.invokeJedisMethod(JedisService.CommonAPI.exists.getName(), "key1")); 49 Set<String> keys = JedisService.invokeJedisMethod(JedisService.CommonAPI.keys.getName(), "key1"); 50 Assert.assertTrue(keys.contains("key1")); 51 52 Assert.assertTrue(JedisService.invokeJedisMethod(JedisService.CommonAPI.hexists.getName(), new Object[] {"key1", "hkey1"})); 53 Set<String> hkeys = JedisService.invokeJedisMethod(JedisService.CommonAPI.hkeys.getName(), "key1"); 54 Assert.assertTrue(hkeys.contains("hkey1")); 55 56 Assert.assertEquals(JedisService.invokeJedisMethod(JedisService.CommonAPI.hget.getName(), new Object[] {"key1", "hkey1"}), "value1"); 57 58 JedisService.invokeJedisMethod(JedisService.CommonAPI.hdel.getName(), new Object[] {"key1", new String[]{"hkey1"}}); 59 Assert.assertFalse(JedisService.invokeJedisMethod(JedisService.CommonAPI.hexists.getName(), new Object[] {"key1", "hkey1"})); 60 61 JedisService.invokeJedisMethod(JedisService.CommonAPI.del.getName(), "key1"); 62 Assert.assertFalse(JedisService.invokeJedisMethod(JedisService.CommonAPI.exists.getName(), "key1")); 63 64 // 2 65 Map<String, String> map = new HashMap<String, String>(); 66 map.put("hkey1", "hvalue1");map.put("hkey2", "hvalue2"); 67 JedisService.invokeJedisMethod(JedisService.CommonAPI.hmset.getName(), new Object[] {"key2", map}); 68 Assert.assertTrue(JedisService.invokeJedisMethod(JedisService.CommonAPI.exists.getName(), "key2")); 69 Assert.assertTrue(JedisService.invokeJedisMethod(JedisService.CommonAPI.hexists.getName(), new Object[] {"key2", "hkey2"})); 70 Assert.assertEquals(JedisService.invokeJedisMethod(JedisService.CommonAPI.hget.getName(), new Object[] {"key2", "hkey2"}), "hvalue2"); 71 Assert.assertEquals((long)JedisService.invokeJedisMethod(JedisService.CommonAPI.hlen.getName(), "key2"), map.size()); 72 73 Map<String, String> res = JedisService.invokeJedisMethod(JedisService.CommonAPI.hgetAll.getName(), "key2"); 74 Assert.assertEquals(res.size(), map.size()); 75 76 List<String> hvalues = JedisService.invokeJedisMethod(JedisService.CommonAPI.hmget.getName(), new Object[] {"key2", map.keySet().toArray(new String[map.size()])}); 77 Assert.assertEquals(hvalues.size(), 2); 78 Assert.assertTrue(hvalues.contains("hvalue1")); 79 Assert.assertTrue(hvalues.contains("hvalue2")); 80 81 JedisService.invokeJedisMethod(JedisService.CommonAPI.del.getName(), "key2"); 82 Assert.assertFalse(JedisService.invokeJedisMethod(JedisService.CommonAPI.exists.getName(), "key2")); 83 84 } 85 86 }
测试全部通过。