Install Redis, familiar Redis commands and integrate Redis, using Redis in Spring.

Code

Redis built 16 libraries, the index is 0-15, the default choice of 0

Redis commonly used commands:


select 1 

flushdb

Keys *

Data type String operations:

K1 the SET 1 
// get key value
 GET K1 
// delete key values
 del K1 
// increment the value of the key from minus
 incr K1 
DECR K1

hash operation types of data: 
// set the key value
 format is: entry key value HSET hash key items of 
example: HSET myhash ID . 1 
// plurality of pairs of key value
 format: the hash key hmset key items of the item value 
example: hmset myhash the above mentioned id 1 name xixi 
// get the value of key
 format: hget hash key of the key items 
such as: hget myhash the above mentioned id 
// get value for key is a multi-
 format: hmget hash key of the key items 
such as: myhash the above mentioned id name hmget 
// get all values in this key
 format is: hgetall hash of key 
example: hgetall myhash 
// If the item does not exist assignment, there is nothing to do when the
 format is: hsetnx hash key items of key items value 
example: hsetnx myhash address Earth 
// determines whether there is a key
 format is: hexists key hash of the key items 
example: hexists myhash id

Spring introduced Redis

First to introduce rely on pom.xml

<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>

Redis then need to configure the database you want to configure parameters in the configuration file application.properties inside.

# RedisProperties
spring.redis.database=11
spring.redis.host=localhost
spring.redis.port=6379

Then configure the class to write to construct RedisTemplate. Actually SpringBoot Redis also been configured RedisTemplate, but because Redis is a key-value database, which at the time did become the key configuration Object types, but because we usually use String, so the re-allocation.

package com.nowcoder.community.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.RedisSerializer;


public class  {
    // 我们要通过 Template 访问数据库，那么它要想具备访问数据库的能力就要能创建连接，而连接又是由连接工厂创建的，所以要把连接工厂注入进来
    
    public RedisTemplate<String, Object> (RedisConnectionFactory redisConnectionFactory) {
        RedisTemplate<String, Object> template = new RedisTemplate<>();
        // 使得Template有访问数据库的能力
        template.setConnectionFactory(redisConnectionFactory);

        // 设置key的序列化的方式
        template.setKeySerializer(RedisSerializer.string());
        // 设置value的序列化方式
        template.setValueSerializer(RedisSerializer.json());
        // 设置hash的key的序列化的方式
        template.setHashKeySerializer(RedisSerializer.string());
        // 设置hash的value的序列化的方式
        template.setHashValueSerializer(RedisSerializer.json());

        template.afterPropertiesSet();
        return template;
    }
}

然后访问数据的时候就是以下用法：

redisTemplate.opsForValue(); // 访问String
redisTemplate.opsForHash(); // 访问Hash
redisTemplate.opsForList(); // 访问List
redisTemplate.opsForSet(); // 访问Set
redisTemplate.opsForZSet(); // 访问ZSet

现在就可以通过 RedisTemplate 来访问Redis数据库，来添加删除数据。

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10 大专栏  SpringBoot开发二十-Redis入门以及Spring整合Redis6
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package com.nowcoder.community;

import org.aspectj.lang.annotation.Aspect;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.dao.DataAccessException;
import org.springframework.data.redis.core.BoundValueOperations;
import org.springframework.data.redis.core.RedisOperations;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.SessionCallback;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringRunner;

import java.util.concurrent.TimeUnit;

@RunWith(SpringRunner.class)
@SpringBootTest
@ContextConfiguration(classes = CommunityApplication.class)
public class RedisTests {
    @Autowired
    private RedisTemplate redisTemplate;

    @Test
    public void testStrings() {
        String redisKey = "test:count";
        redisTemplate.opsForValue().set(redisKey, 1);
        System.out.println(redisTemplate.opsForValue().get(redisKey));
        System.out.println(redisTemplate.opsForValue().increment(redisKey));
        System.out.println(redisTemplate.opsForValue().decrement(redisKey));
    }

    @Test
    public void testHashes() {
        String redisKey = "test:user";

        redisTemplate.opsForHash().put(redisKey, "id", 1);
        redisTemplate.opsForHash().put(redisKey, "username", "zhangsan");

        System.out.println(redisTemplate.opsForHash().get(redisKey, "id"));
        System.out.println(redisTemplate.opsForHash().get(redisKey, "username"));
    }

    @Test
    public void testLists() {
        String redisKey = "test:ids";

        redisTemplate.opsForList().leftPush(redisKey, 101);
        redisTemplate.opsForList().leftPush(redisKey, 102);
        redisTemplate.opsForList().leftPush(redisKey, 103);

        System.out.println(redisTemplate.opsForList().size(redisKey));
        System.out.println(redisTemplate.opsForList().index(redisKey, 0));
        System.out.println(redisTemplate.opsForList().range(redisKey, 0, 2));

        // 从左边弹出,左边leftpop,右边rightpop
        System.out.println(redisTemplate.opsForList().leftPop(redisKey));
        System.out.println(redisTemplate.opsForList().leftPop(redisKey));
        System.out.println(redisTemplate.opsForList().leftPop(redisKey));
    }

    @Test
    public void testSets() {
        String redisKey = "test:teachers";

        redisTemplate.opsForSet().add(redisKey, "刘备", "关羽", "张飞", "赵云", "诸葛亮");

        System.out.println(redisTemplate.opsForSet().size(redisKey));
        System.out.println(redisTemplate.opsForSet().pop(redisKey));
        System.out.println(redisTemplate.opsForSet().members(redisKey));
    }

    @Test
    public void testSortedSets() {
        String redisKey = "test:students";

        redisTemplate.opsForZSet().add(redisKey, "唐僧", 80);
        redisTemplate.opsForZSet().add(redisKey, "悟空", 90);
        redisTemplate.opsForZSet().add(redisKey, "八戒", 50);
        redisTemplate.opsForZSet().add(redisKey, "沙僧", 70);
        redisTemplate.opsForZSet().add(redisKey, "白龙马", 60);

        // 统计数据
        System.out.println(redisTemplate.opsForZSet().zCard(redisKey));
        // 查询某个人的分数
        System.out.println(redisTemplate.opsForZSet().score(redisKey, "八戒"));
        // 查询排名，默认从小到大
        System.out.println(redisTemplate.opsForZSet().reverseRank(redisKey, "八戒"));
        // 查询区间排名数据
        System.out.println(redisTemplate.opsForZSet().reverseRange(redisKey, 0, 2));
    }

    @Test
    public void testKeys() {
        redisTemplate.delete("test:user");

        System.out.println(redisTemplate.hasKey("test:user"));

        redisTemplate.expire("test:students", 10, TimeUnit.SECONDS);
    }

    // 多次访问同一个key
    @Test
    public void testBoundOperations() {
        String redisKey = "test:count";
        BoundValueOperations operations = redisTemplate.boundValueOps(redisKey);
        operations.increment();
        operations.increment();
        operations.increment();
        operations.increment();
        operations.increment();
        System.out.println(operations.get());
    }

    // Redis编程序事务，并不一定满足我们之前说过的事务，因为不是关系型数据库
    @Test
    public void testTransactional() {
        Object obj = redisTemplate.execute(new SessionCallback() {
            @Override
            public Object execute(RedisOperations operations) throws DataAccessException {
                String redisKey = "test:tx";
                // 启用事务
                operations.multi();

                operations.opsForSet().add(redisKey, "zhangsan");
                operations.opsForSet().add(redisKey, "lisi");
                operations.opsForSet().add(redisKey, "wangwu");

                System.out.println(operations.opsForSet().members(redisKey));
                // 提交事务
                return operations.exec();
            }
        });
        System.out.println(obj);
    }
}

SpringBoot developed twenty -Redis entry Redis and Spring Integration

Code

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