报错原因：没有启动服务，打开服务即可

redis.clients.jedis.exceptions.JedisConnectionException:

Exception in thread "main" redis.clients.jedis.exceptions.JedisConnectionException: Failed connecting to host localhost:

    at redis.clients.jedis.Connection.connect(Connection.java:)

    at redis.clients.jedis.BinaryClient.connect(BinaryClient.java:)

    at redis.clients.jedis.Connection.sendCommand(Connection.java:)

    at redis.clients.jedis.Connection.sendCommand(Connection.java:)

    at redis.clients.jedis.BinaryClient.ping(BinaryClient.java:)

    at redis.clients.jedis.BinaryJedis.ping(BinaryJedis.java:)

    at com.wbg.mr.test.Main.main(Main.java:)

Caused by: java.net.ConnectException: Connection refused: connect

    at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method)

    at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:)

    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:)

    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:)

    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:)

    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:)

    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:)

    at java.net.Socket.connect(Socket.java:)

    at redis.clients.jedis.Connection.connect(Connection.java:)

    ...  more

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