如何正確的使用Jedis連接池

private static JedisPool jedisPool = null;
private static Jedis jedis;

static {
  jedis = getJedisPool().getResource();
}

/**
 * 構(gòu)建redis連接池
 */
public static JedisPool getJedisPool() {
  if (jedisPool == null) {
    JedisPoolConfig config = new JedisPoolConfig();
    config.setMaxTotal(1024); // 可用連接實(shí)例的最大數(shù)目,如果賦值為-1,表示不限制.
    config.setMaxIdle(5); // 控制一個(gè)Pool最多有多少個(gè)狀態(tài)為idle(空閑的)jedis實(shí)例,默認(rèn)值也是8
    config.setMaxWaitMillis(1000 * 100); // 等待可用連接的最大時(shí)間,單位毫秒,默認(rèn)值為-1,表示永不超時(shí)/如果超過(guò)等待時(shí)間,則直接拋出異常
    config.setTestOnBorrow(true); // 在borrow一個(gè)jedis實(shí)例時(shí),是否提前進(jìn)行validate操作,如果為true,則得到的jedis實(shí)例均是可用的
    jedisPool = new JedisPool(config, "127.0.0.1", 6379);
  }
  return jedisPool;
}

/**
 * 釋放jedis資源
 */
public static void returnResource(Jedis jedis) {
  if (jedis != null) {
    jedis.close();
  }
}

public static String get(String key) {
  String value = null;
  Jedis jedis = null;
  try {
    JedisPool pool = getJedisPool();
    jedis = pool.getResource();
    value = jedis.get(key);
  }
  catch (Exception e) {
    returnResource(jedis);
    e.printStackTrace();
  }
  finally {
    returnResource(jedis);
  }
  return value;
}

public static String getByTemplate(final String key) {
  RedisTemplate redisTemplate = new RedisTemplate(getJedisPool());
  String value = redisTemplate.execute(new RedisCallback<String>() {
    @Override
    public String handle(Jedis jedis) {
      return jedis.get(key);
    }
  });
  return value;
}

public class RedisTemplate {

  private JedisPool jedisPool;

  public RedisTemplate(JedisPool jedisPool) {
    this.jedisPool = jedisPool;
  }

  public <T> T execute(RedisCallback<T> callback) {
    Jedis jedis = jedisPool.getResource();
    try {
      return callback.handle(jedis);
    }
    catch (Exception e) {
      // throw your exception
      throw e;
    }
    finally {
      returnResource(jedis);
    }
  }

  private void returnResource(Jedis jedis) {
    if (jedis != null) {
      jedis.close();
    }
  }
}
public interface RedisCallback<T> {
  public T handle(Jedis jedis);
}

@Test
public void testString() {
  jedis.set("name", "webb"); // 添加數(shù)據(jù)
  System.out.println("name -> " + jedis.get("name"));

  jedis.append("name", " , javaer"); // 拼接
  System.out.println("name -> " + jedis.get("name"));

  jedis.del("name"); // 刪除數(shù)據(jù)
  System.out.println("name -> " + jedis.get("name"));

  jedis.mset("name", "webb", "age", "24"); // 設(shè)置多個(gè)鍵值對(duì)
  jedis.incr("age"); // 進(jìn)行加1操作

  System.out.println("name -> " + jedis.get("name") + ", age -> " + jedis.get("age"));
}

@Test
public void testList() {
  String key = "java framework";

  jedis.lpush(key, "spring");
  jedis.lpush(key, "spring mvc");
  jedis.lpush(key, "mybatis");

  System.out.println(jedis.lrange(key, 0 , -1)); // -1表示取得所有

  jedis.del(key);
  jedis.rpush(key, "spring");
  jedis.rpush(key, "spring mvc");
  jedis.rpush(key, "mybatis");

  System.out.println(jedis.lrange(key, 0 , -1)); // -1表示取得所有

  System.out.println(jedis.llen(key)); // 列表長(zhǎng)度
  System.out.println(jedis.lrange(key, 0, 3));
  jedis.lset(key, 0 , "redis"); // 修改列表中單個(gè)值
  System.out.println(jedis.lindex(key, 1)); // 獲取列表指定下標(biāo)的值
  System.out.println(jedis.lpop(key)); // 列表出棧
  System.out.println(jedis.lrange(key, 0 , -1)); // -1表示取得所有
}

@Test
public void testMap() {
  String key = "user";

  Map<String, String> map = new HashMap<>();
  map.put("name", "webb");
  map.put("age", "24");
  map.put("city", "hangzhou");

  jedis.hmset(key, map); // 添加數(shù)據(jù)

  List<String> rsmap = jedis.hmget(key, "name", "age", "city"); // 第一個(gè)參數(shù)存入的是redis中map對(duì)象的key,后面跟的是放入map中的對(duì)象的key
  System.out.println(rsmap);

  jedis.hdel(key, "age"); // 刪除map中的某個(gè)鍵值

  System.out.println(jedis.hmget(key, "age"));
  System.out.println(jedis.hlen(key)); // 返回key為user的鍵中存放的值的個(gè)數(shù)
  System.out.println(jedis.exists(key)); // 是否存在key為user的記錄
  System.out.println(jedis.hkeys(key)); // 返回map對(duì)象中的所有key
  System.out.println(jedis.hvals(key)); // 返回map對(duì)象中所有的value

  Iterator<String> iterator = jedis.hkeys("user").iterator();

  while (iterator.hasNext()) {
    String key2 = iterator.next();
    System.out.print(key2 + " : " + jedis.hmget("user", key2) + "\n");
  }
}

@Test
public void testSet() {
  String key = "userSet";
  String key2 = "userSet2";

  jedis.sadd(key, "webb");
  jedis.sadd(key, "webb");
  jedis.sadd(key, "lebo");
  jedis.sadd(key, "lebo0425");
  jedis.sadd(key, "who");

  jedis.srem(key, "who"); // 刪除

  System.out.println(jedis.smembers(key)); // 獲取所有加入的value
  System.out.println(jedis.sismember(key, "who")); // 判斷value是否在集合中
  System.out.println(jedis.srandmember(key)); // 隨機(jī)返回一個(gè)value
  System.out.println(jedis.scard(key)); // 返回集合的元素個(gè)數(shù)

  jedis.sadd(key2, "webb");
  jedis.sadd(key2, "ssq");

  System.out.println(jedis.sinter(key, key2)); // 交集
  System.out.println(jedis.sunion(key, key2)); // 并集
  System.out.println(jedis.sdiff(key, key2)); // 差集
}

@Test
public void testSortedSet() {
  String key = "sortedSet";

  jedis.zadd(key, 1999, "one");
  jedis.zadd(key, 1994, "two");
  jedis.zadd(key, 1998, "three");
  jedis.zadd(key, 2000, "four");
  jedis.zadd(key, 2017, "five");

  Set<String> setValues = jedis.zrange(key, 0 , -1); // score從小到大
  System.out.println(setValues);
  Set<String> setValues2 = jedis.zrevrange(key, 0, -1); // score從大到小
  System.out.println(setValues2);

  System.out.println(jedis.zcard(key)); // 元素個(gè)數(shù)
  System.out.println(jedis.zscore(key, "three")); // 元素下標(biāo)
  System.out.println(jedis.zrange(key, 0, -1)); // 集合子集
  System.out.println(jedis.zrem(key, "five")); // 刪除元素
  System.out.println(jedis.zcount(key, 1000, 2000)); // score在1000-2000內(nèi)的元素個(gè)數(shù)
}