Bootstrap

Spring整合redis

引入依赖

pom.xml

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

配置Redis

配置数据库参数
application.properties

#RedisProperties
spring.redis.database=11   //选择哪个库，0~15
spring.redis.host=localhost
spring.redis.port=6379

编写配置类

  • 利用template访问数据库，这个template要具备访问数据库的能力，需要创建连接，连接是由连接工厂创建的，所以需要把连接工厂注入给template，才能访问数据库RedisConnectionFactory factory template.setConnectionFactory(factory);
  • 配置序列化的方式，因为程序是java程序，得到的数据是java类型的数据，最终要把数据存到redis数据库里，那么要指定序列化方式
@Configuration
public class RedisConfig {
    @Bean
    public RedisTemplate<String,Object> redisTemplate(RedisConnectionFactory factory){
        //实例化bean
        RedisTemplate<String,Object> template = new RedisTemplate<>();
        template.setConnectionFactory(factory);
        //设置key的序列化方式
        template.setKeySerializer(RedisSerializer.string());
        //设置value的序列化方式
        template.setValueSerializer(RedisSerializer.json());
        //设置hash的key的序列化方式
        template.setHashKeySerializer(RedisSerializer.string());
        //设置hash的value的序列化方式
        template.setHashValueSerializer(RedisSerializer.json());
        //触发生效
        template.afterPropertiesSet();
        return template;
    }
}

测试类

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.connection.RedisConnection;
import org.springframework.data.redis.connection.RedisStringCommands;
import org.springframework.data.redis.core.*;
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 RedisTest {
    @Autowired
    private RedisTemplate redisTemplate;
    @Test
    public void testString(){
        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 testList(){
        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));
        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);
        System.out.println(redisTemplate.opsForZSet().zCard(redisKey));
        System.out.println(redisTemplate.opsForZSet().score(redisKey,"八戒"));
        System.out.println(redisTemplate.opsForZSet().rank(redisKey,"八戒"));
        System.out.println(redisTemplate.opsForZSet().reverseRank(redisKey,"八戒"));
        System.out.println(redisTemplate.opsForZSet().range(redisKey,0,2));
        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());
    }

    //事务
    //不满足四个特点
    //启用事务后，当执行一个redis命令时，并不会立刻执行，而是放入队列里，先存着，再执行一个命令，就再放入队列里，直到操作完了，
    // 提交事务的时候，会把队列里所有命令一股脑发送给redis服务器，一起执行
    //问题：事务之内的命令不会立即执行，所以在事务过程中进行一次查询，不会立即返回结果，所以不要在事务中间进行查询，要不就在事务之前查询，要不就在事务提交之后查询
    //编程式事务
    @Test
    public void testTransactional(){
        Object obj = redisTemplate.execute(new SessionCallback() {
            @Override
            public Object execute(RedisOperations operations) throws DataAccessException {
                String redisKey = "test:tx";
                //开启事务
                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);
    }
//    统计20万个重复数据的独立总数
    @Test
    public void testHyperLogLog(){
        String redisKey = "test:hll:01";
        for (int i = 1;i <= 100000;i++){
            redisTemplate.opsForHyperLogLog().add(redisKey,i);
        }
        for (int i = 1;i <= 100000;i++){
            int r = (int) (Math.random()*100000+1);
            redisTemplate.opsForHyperLogLog().add(redisKey,r);
        }
        System.out.println(redisTemplate.opsForHyperLogLog().size(redisKey));
    }
//    将三组数据合并，再统计合并后的重复数据的独立总数
    @Test
    public void testHyperLogLogUnion(){
        String redisKey2 = "test:hll:02";
        for(int i=1;i<=10000;i++){
            redisTemplate.opsForHyperLogLog().add(redisKey2,i);
        }
        String redisKey3 = "test:hll:03";
        for(int i=1;i<=15000;i++){
            redisTemplate.opsForHyperLogLog().add(redisKey3,i);
        }
        String redisKey4 = "test:hll:04";
        for(int i=10001;i<=20000;i++){
            redisTemplate.opsForHyperLogLog().add(redisKey4,i);
        }
        String unionKey = "test:hll:union";
        redisTemplate.opsForHyperLogLog().union(unionKey,redisKey2,redisKey3,redisKey4);
        long size = redisTemplate.opsForHyperLogLog().size(unionKey);
        System.out.println(size);
    }
//    统计一组数据的布尔值
    @Test
    public void testBitMap(){
        String redisKey = "test:bm:01";
//        记录
        redisTemplate.opsForValue().setBit(redisKey,1,true);
        redisTemplate.opsForValue().setBit(redisKey,4,true);
        redisTemplate.opsForValue().setBit(redisKey,7,true);
//        查询
        System.out.println(redisTemplate.opsForValue().getBit(redisKey,0));
        System.out.println(redisTemplate.opsForValue().getBit(redisKey,1));
        System.out.println(redisTemplate.opsForValue().getBit(redisKey,2));
//        统计
        Object obj = redisTemplate.execute(new RedisCallback() {
            @Override
            public Object doInRedis(RedisConnection connection) throws DataAccessException {
                return connection.bitCount(redisKey.getBytes());
            }
        });
        System.out.println(obj);
    }
//    统计3组数据的布尔值，并对这3组数据做OR运算
    @Test
    public void testBitMapOperation(){
        String redisKey2 = "test:bm:02";
        redisTemplate.opsForValue().setBit(redisKey2,0,true);
        redisTemplate.opsForValue().setBit(redisKey2,1,true);
        redisTemplate.opsForValue().setBit(redisKey2,2,true);
        String redisKey3 = "test:bm:03";
        redisTemplate.opsForValue().setBit(redisKey3,2,true);
        redisTemplate.opsForValue().setBit(redisKey3,3,true);
        redisTemplate.opsForValue().setBit(redisKey3,4,true);
        String redisKey4 = "test:bm:04";
        redisTemplate.opsForValue().setBit(redisKey4,4,true);
        redisTemplate.opsForValue().setBit(redisKey4,5,true);
        redisTemplate.opsForValue().setBit(redisKey4,6,true);
        String redisKey = "test:bm:or";
        Object obj = redisTemplate.execute(new RedisCallback() {
            @Override
            public Object doInRedis(RedisConnection connection) throws DataAccessException {
                connection.bitOp(RedisStringCommands.BitOperation.OR,redisKey.getBytes(),redisKey2.getBytes()
                ,redisKey3.getBytes(),redisKey4.getBytes());
                return connection.bitCount(redisKey.getBytes());
            }
        });
        System.out.println(obj);
        System.out.println(redisTemplate.opsForValue().getBit(redisKey,0));
        System.out.println(redisTemplate.opsForValue().getBit(redisKey,1));
        System.out.println(redisTemplate.opsForValue().getBit(redisKey,2));
        System.out.println(redisTemplate.opsForValue().getBit(redisKey,3));
        System.out.println(redisTemplate.opsForValue().getBit(redisKey,4));
        System.out.println(redisTemplate.opsForValue().getBit(redisKey,5));
        System.out.println(redisTemplate.opsForValue().getBit(redisKey,6));
    }
}

悦读

道可道，非常道；名可名，非常名。 无名，天地之始，有名，万物之母。 故常无欲，以观其妙，常有欲，以观其徼。 此两者，同出而异名，同谓之玄，玄之又玄，众妙之门。

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