Java中使用Jedis连接Redis对Key进行操作的常用命令

港控/mmm° 2023-10-07 11:14 53阅读 0赞

## 场景 ##

Java中使用Jedis连接池连接Redis数据库流程：

[https://blog.csdn.net/BADAO\_LIUMANG\_QIZHI/article/details/104914320][https_blog.csdn.net_BADAO_LIUMANG_QIZHI_article_details_104914320]

在上面使用Jedis连接池的方式连接Redis数据库后，使用Jedis对Key进行操作。

为了方便测试，在pom.xml中引入junit

<dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>4.12</version>
            </dependency>

然后新建TestKeys类，在上面使用连接池连接Redis的基础上，抽离出来获取jedis对象和 关闭jedis对象的方法。

package com.badao.jedisTest;
    
    import org.junit.After;
    import org.junit.Before;
    import org.junit.Test;
    import redis.clients.jedis.Jedis;
    import redis.clients.jedis.JedisPool;
    import redis.clients.jedis.JedisPoolConfig;
    
    public class TestKeys {
    
        //客户端对象
        Jedis jedis = null;
        JedisPool jedisPool = null;
    
        @Test
        public void TestKeys(){
            System.out.println("清空数据库："+jedis.flushDB());
        }
    
        @Before
        public void init(){
            //设置连接池的配置对象
            JedisPoolConfig config = new JedisPoolConfig();
            //设置连接池参数
            config.setMaxTotal(30);
            config.setMaxIdle(10);
            //获取连接池对象
            jedisPool = new JedisPool(config, "192.168.40.133", 6379);
            try{
                jedis = jedisPool.getResource();
            }catch(Exception e){
                e.printStackTrace();
            }
        }
    
        @After
        public void closeResource()
        {
            if(jedis !=null)
                jedis.close();
        }
    }

然后编写测试方法，测试flushDB清空数据库的方法如上，运行结果返回个OK

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70][]

此时在客户端查看

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 1][]

是否存在badao这个key

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 2][]

新增username=badao

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 3][]

系统中所有的键

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 4][]

删除键username

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 5][]

查看键username的类型

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 6][]

随机返回一个键值

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 7][]

username重命名为name

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 8][]

返回当前数据库所有key的数目

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 9][]

[https_blog.csdn.net_BADAO_LIUMANG_QIZHI_article_details_104914320]: https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/104914320
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