在服务器上打开redis客户端，然后使用telnet命令访问redis服务端口：telnet 192.168.1.129 6379，会出现下面这一大段英文，告诉我们redis处于保护模式，只需要取消保护模式即可。
然后打开redis的客户端输入运行 CONFIG SET protected-mode no，返回一个ok，其他电脑的客户端（比如java程序）就能连上了。
root@ubuntu:/data/redis-4.0.6# telnet 192.168.1.129 6379
Connected to 192.168.1.129.
Escape character is '^]'.
-DENIED Redis is running in protected mode because protected mode is enabled, no bind address was specified,
no authentication password is requested to clients. In this mode connections are only accepted from the loopback interface.
If you want to connect from external computers to Redis you may adopt one of the following solutions:
1) Just disable protected mode sending the command 'CONFIG SET protected-mode no' from the loopback interface by connecting to
Redis from the same host the server is running, however MAKE SURE Redis is not publicly accessible from internet if you do so.
Use CONFIG REWRITE to make this change permanent.
2) Alternatively you can just disable the protected mode by editing the Redis configuration file, and setting
the protected mode option to 'no', and then restarting the server.
3) If you started the server manually just for testing, restart it with the '--protected-mode no' option.
4) Setup a bind address or an authentication password. NOTE: You only need to do one of the above things in order
for the server to start accepting connections from the outside.
Connection closed by foreign host.
127.0.0.1:6379> CONFIG SET protected-mode no