Redis数据库 : python与java操作redis

redis 包

from redis import *

连接: r = StrictRedis(host='localhost', port='6379')

读写:r.set('key','value')

r.get('key')

第二种方法: pipline(缓冲命令,一次执行)

pip = r.pipline()

pip.set('key','value')

pip.get('key')

pip.execute() ---用这个方法执行缓冲的语句

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java需要用 jedis包,如果需要用pool还需要commons-pool2包.

Jedis jedis = new Jedis("ip", 端口);
jedis.auth("root");
.................

使用池子:

JedisPoolConfig config = new JedisPoolConfig();
config.setMaxTotal(); // 最大连接数
config.setMaxIdle();  // 最大空闲连接数
JedisPool pool = new JedisPool(config, "ip", 端口);
Jedis jedis = pool.getResource();
jedis.auth("root");
.............................

使用redis集群,一个JedisShardInfo就是一个redis服务器的信息:

package com;

import org.apache.commons.pool2.impl.GenericObjectPoolConfig;
import redis.clients.jedis.*;

import java.net.URI;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.List;

/**
 * @author Zhai
 * 2019/04/01 16:56
 */

public class JedisTest {
    public static void main(String[] args) throws URISyntaxException {
        GenericObjectPoolConfig config = new GenericObjectPoolConfig(); // config配置
        List<JedisShardInfo> infos = new ArrayList<>();
        JedisShardInfo info = new JedisShardInfo(new URI("redis://:qwe...@127.0.0.1:6379/1"));
        infos.add(info);
        ShardedJedisPool pool = new ShardedJedisPool(config, infos);

        ShardedJedis resource = pool.getResource();// 从连接池获取client
        if (resource == null) System.out.println("获取client出错");
        resource.set("key01", "value data");
        resource.expire("key01", 5); // 5秒之后清除
        resource.close();
        pool.close();
    }
}

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在spring boot中使用 spring data redis， 首先添加pom文件：

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

application.properties 文件配置（单个redis节点）：

spring.redis.host=1.1.1.1
spring.redis.port=6379
spring.redis.password=123
spring.redis.database=0

添加bean（注意bean的名称必须为redisTemplate,这样才能覆盖默认配置）：

    @Bean(name = "redisTemplate")
    public RedisTemplate<String, Object> redisTemplate(LettuceConnectionFactory factory) {
        RedisTemplate<String, Object> template = new RedisTemplate<>();
        Jackson2JsonRedisSerializer<Object> serializer = new Jackson2JsonRedisSerializer<>(Object.class);
        ObjectMapper mapper = new ObjectMapper();
        mapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);//所有属性均可见
        mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);//为null不参加序列化
        mapper.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);//在Redis中存储对象类信息
        serializer.setObjectMapper(mapper);
        template.setKeySerializer(new StringRedisSerializer());
        template.setValueSerializer(serializer);
        template.setHashKeySerializer(new StringRedisSerializer());
        template.setHashValueSerializer(serializer);
        template.setConnectionFactory(factory);
        return template;
    }