java连接redis

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前言

jedis仓库地址
jedis简单案例
jedisAPI文档
java提供了jedis客户端来连接redis,jedis提供了丰富的api,基本覆盖了redis的命令,本篇文章主要记录redis连接过程。
redis配置文件:redis.conf

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一、准备工作

1.引入库

<dependency>
    <groupId>redis.clientsgroupId>
    <artifactId>jedisartifactId>
    <version>4.3.0version>
dependency>

想用个新版本来着,但半天没下载下来,一看官网在升级……

顺着仓库找了下,下载了放本地仓库也好使

二、redis服务端配置

redis出于安全考虑,安全模式开启的情况下没有配置新用户和密码的时候,只能通过本地连接,无法远程

1.修改配置文件(让远程可以访问)

注释redis.conf中 #bind 127.0.0.1 -::1

2.生成密码

2.1生成密码串

redis默认提供了一个default用户

acl genpass

2.2将密码串添加配置文件中

requirepass 21797d7480c1270b848a1524128671b31dcad0725762cf41cc81c21e15fa35b2

三、编写jedis测试类

1.jedis连接测试

Test.java

package redis;

import redis.clients.jedis.Jedis;

/**
 * Create by zjg on 2022/10/23
 */
public class Test {
    public static void main(String[] args) {
        String password="21797d7480c1270b848a1524128671b31dcad0725762cf41cc81c21e15fa35b2";
        Jedis jedis = new Jedis("ip", 6379);
        jedis.auth(password);
        String ping = jedis.ping();
        System.out.println("ping:"+ping);
    }
}

PONG翻译过来是乒乓球,连不上直接就抛出异常了

2.jedis连接池

JedisPoolUtils.java

package com.student.sys.util;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Configuration;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
import javax.annotation.PostConstruct;

/**
 * Create by zjg on 2022/10/27
 */
@Configuration
public class JedisPoolUtils {
    private static JedisPool jedisPool;
    @Value("${spring.redis.host}")
    private  String host;
    @Value("${spring.redis.port}")
    private int port;
    @Value("${spring.redis.user:default}")
    private String user;
    @Value("${spring.redis.password}")
    private String password;
    @PostConstruct
    private void init(){
        jedisPool=new JedisPool(host, port, user, password);
    }
    public static Jedis getResource() {
        synchronized (JedisPoolUtils.class){
            if(jedisPool==null){
                new JedisPoolUtils().init();
            }
        }
        return jedisPool.getResource();
    }
    public static void close(){
        jedisPool.close();
    }
}

@Test
    public void redisPoolTest(){
        Jedis jedis= JedisPoolUtils.getResource();
        System.out.println(jedis.ping());
        jedis.close();
        JedisPoolUtils.close();
    }

四、springboot整合reids

spring提供了spring-data-redis,springboot提供了启动自动配置类
spring操作redis参考
spring操作redisAPI

1.引入类

pom.xml

		<dependency>
			<groupId>redis.clientsgroupId>
			<artifactId>jedisartifactId>
			<version>4.3.0version>
		dependency>

		<dependency>
			<groupId>org.springframework.bootgroupId>
			<artifactId>spring-boot-starter-data-redisartifactId>
			<version>2.7.0version>
		dependency>

2.添加配置

application.yml

spring :
  redis:
    host: 127.0.0.1
    port: 6379
    password: 21797d7480c1270b848a1524128671b31dcad0725762cf41cc81c21e15fa35b2

redis的配置基于RedisProperties类,提供了两种默认模板在RedisAutoConfiguration类

3.编写RedisTemplate 测试类

SpringBootTest.java

package redis;

import com.student.SpringbootStart;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.DefaultTypedTuple;
import org.springframework.data.redis.core.HashOperations;
import org.springframework.data.redis.core.ListOperations;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.SetOperations;
import org.springframework.data.redis.core.ValueOperations;
import org.springframework.data.redis.core.ZSetOperations;
import org.springframework.test.context.junit4.SpringRunner;
import java.util.HashSet;
import java.util.Set;

/**
 * Create by zjg on 2022/10/24
 */
@RunWith(SpringRunner.class)
@org.springframework.boot.test.context.SpringBootTest(classes = SpringbootStart.class)
public class SpringBootTest {
    @Autowired
    private RedisTemplate redisTemplate;
    @Test
    public void redisTest(){
        //string
        ValueOperations<String, String> stringOperations = redisTemplate.opsForValue();
        stringOperations.set("user","zhangjg");
        String user = stringOperations.get("user");
        System.out.println("stringSize:"+user.length());
        System.out.println("string:"+ user);
        //list
        ListOperations listOperations = redisTemplate.opsForList();
        //listOperations.leftPushAll("list",1,2);
        System.out.println("listSize:"+listOperations.size("list"));
        System.out.println("list:"+listOperations.range("list",0,-1));
        //set
        SetOperations setOperations = redisTemplate.opsForSet();
        //setOperations.add("set","s1","s2","s3","s4","s5");
        Long setSize = setOperations.size("set");
        System.out.println("setSize:"+setSize);
        System.out.println("set:"+setOperations.randomMembers("set",setSize));
        //hash
        HashOperations hashOperations = redisTemplate.opsForHash();
        //hashOperations.put("hash","field","value");
        System.out.println("hashSize:"+hashOperations.size("hash"));
        System.out.println("hash:"+hashOperations.entries("hash"));
        //sorted set
        ZSetOperations zSetOperations = redisTemplate.opsForZSet();
        Set<ZSetOperations.TypedTuple> zset=new HashSet<>();
        DefaultTypedTuple v1 = new DefaultTypedTuple("v1", 10D);
        DefaultTypedTuple v2 = new DefaultTypedTuple("v2", 20D);
        DefaultTypedTuple v3 = new DefaultTypedTuple("v3", 50D);
        zset.add(v3);zset.add(v1);zset.add(v2);
        zSetOperations.add("zset",zset);
        System.out.println("zsetSize:"+zSetOperations.size("zset"));
        System.out.println("zset:"+zSetOperations.range("zset",0,-1));
    }
}

只做了5种基本类型的增加测试

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总结

redis常用命令
jedis封装大量api对应redis的命令,只要redis命令学会了,jedis很容易上手;
spring对redis又进行了一层封装,提供了例如RedisTemplate的模板类,方法名不如jedis来得简单,具体可以参考aip文档来学习。