一.jedis简介

　　类似于mysql数据库，一般开发都需要通过代码去访问redis服务器，对于主流的开发语言，redis提供了访问的客户端接口。

　　https://redis.io/clients

　　　而对于Java而言，最常用的就是jedis了。

二.jedis访问redis服务器代码实现

　　1.创建Maven工程，添加jedis依赖如下：

<!--redis-->

    <dependency>

      <groupId>redis.clients</groupId>

      <artifactId>jedis</artifactId>

      <version>2.9.0</version>

    </dependency>

  </dependencies>

　　2.简单的代码测试

public class RedisTest {

    public static void main(String[] args) {

        Jedis jedis = new Jedis("192.168.2.132", 6379);  //创建客户端，1p和端口号

        jedis.set("name", "齐高相");

        String value = jedis.get("name");

         System.out.println(value);

         jedis.close(); //释放连接资源

    }

}

　　运行之后，会报错。

　　　　原因是redis在虚拟机上，默认只允许本机访问，

　　1.开放redis端口的防火墙

　　　　命令如下：

继续尝试运行，

Exception in thread "main" redis.clients.jedis.exceptions.JedisDataException: 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.
at redis.clients.jedis.Protocol.processError(Protocol.java:127)
at redis.clients.jedis.Protocol.process(Protocol.java:161)
at redis.clients.jedis.Protocol.read(Protocol.java:215)
at redis.clients.jedis.Connection.readProtocolWithCheckingBroken(Connection.java:340)
at redis.clients.jedis.Connection.getStatusCodeReply(Connection.java:239)
at redis.clients.jedis.Jedis.set(Jedis.java:121)
at com.qgx.redis.RedisTest.main(RedisTest.java:9)

　　报错的意思是说redis在保护模式下运行，需要去掉保护。

去掉redis的自我保护

　　1.直接去掉自我保护（不推荐）

　　进入redis的配置文件

　　vi /usr/local/redis/redis.conf

　　将daemonize yes改为no

　　第二种  设置redis的连接密码

　　./bin/redis-cli

　　config set requirepass 123456  123456为访问密码

　　　代码处需要认证密码。

　　　　重新运行

　　　　至此，远程访问成功！