尚硅谷Redis学习笔记-- Jedis的使用

Posted 2021-08-10 exodus3

一、Jedis测试

1.Jedis所需的jar包

<dependency>
	<groupId>redis.clients</groupId>
	<artifactId>jedis</artifactId>
	<version>3.2.0</version>
</dependency>

2.连接Redis注意事项

禁用Linux的防火墙：Linux(CentOS7)里执行命令：

systemctl stop/disable firewalld.service

redis.conf中注释掉bind 127.0.0.1，然后 protected-mode no

3.创建测试程序

package com.xu.jedis;

import redis.clients.jedis.Jedis;

public class JedisDemo1 {
    public static void main(String[] args) {
        //创建jedis对象
        Jedis jedis = new Jedis("192.168.50.128",6379);
        //连接redis的密码
        jedis.auth("root");
        //测试
        String value = jedis.ping();
        System.out.println(value);
    }
}

4.测试相关数据类型

4.1 Jedis-API：Key

jedis.set("k1", "v1");
jedis.set("k2", "v2");
jedis.set("k3", "v3");

Set<String> keys = jedis.keys("*");
System.out.println(keys.size());

for (String key : keys) {
	System.out.println(key);
}

System.out.println(jedis.exists("k1"));
System.out.println(jedis.ttl("k1"));                
System.out.println(jedis.get("k1"));

4.2 Jedis-API：String

jedis.mset("str1","v1","str2","v2","str3","v3");
System.out.println(jedis.mget("str1","str2","str3"));

4.3 Jedis-API：list

List<String> list = jedis.lrange("mylist",0,-1);
for (String element : list) {
	System.out.println(element);
}

4.4 Jedis-API：set

jedis.sadd("orders", "order01");
jedis.sadd("orders", "order02");
jedis.sadd("orders", "order03");
jedis.sadd("orders", "order04");

Set<String> smembers = jedis.smembers("orders");

for (String order : smembers) {
	System.out.println(order);
}

jedis.srem("orders", "order02");

4.5 Jedis-API：hash

jedis.hset("hash1","userName","lisi");
System.out.println(jedis.hget("hash1","userName"));

Map<String,String> map = new HashMap<String,String>();
map.put("telphone","13810169999");
map.put("address","atguigu");
map.put("email","[e-mail]");

jedis.hmset("hash2",map);

List<String> result = jedis.hmget("hash2", "telphone","email");

for (String element : result) {
	System.out.println(element);
}

4.6 Jedis-API：zset

jedis.zadd("zset01", 100d, "z3");
jedis.zadd("zset01", 90d, "l4");
jedis.zadd("zset01", 80d, "w5");
jedis.zadd("zset01", 70d, "z6");
 
Set<String> zrange = jedis.zrange("zset01", 0, -1);

for (String e : zrange) {
	System.out.println(e);
}

二、Jedis实例：手机验证码功能

要求：
1、输入手机号，点击发送后随机生成6位数字码，2分钟有效
2、输入验证码，点击验证，返回成功或失败
3、每个手机号每天只能输入3次

代码展示：

package com.xu.jedis;

import redis.clients.jedis.Jedis;

import java.util.Random;

public class PhoneCode {
    public static void main(String[] args) {
        //模拟验证码发送
        //verifyCode("137000000");
        
        //校验发送的验证码
        //getRedisCode("137000000","验证码");
    }

    //1.随即生成一个六位数的验证码
    public static String getCode(){
        Random random = new Random();
        String code = "";
        for (int i = 0; i < 6; i++) {
            int rand = random.nextInt(10);
            code += rand;
        }
        return code;
    }

    //2.每个手机每天只能发送三次，验证码放到redis中，设置过期时间
    public static void verifyCode(String phone){
        //连接redis
        Jedis jedis = new Jedis("192.168.50.128", 6379);
        //输入redis连接密码
        jedis.auth("root");

        //拼接key
        //手机发送次数key
        String countKey = "VerifyCode" + phone + ":count";
        //验证码key
        String codeKey = "VerifyCode" + phone + ":code";

        //每个手机每天只能发送3次
        String count = jedis.get(countKey);
        if (count == null){
            //没有发送次数，第一次发送
            //设置发送次数是1
            jedis.setex(countKey,24 * 60 * 60,"1");
        }else if (Integer.parseInt(count) <= 2){
            //发送次数+1
            jedis.incr(countKey);
        }else if (Integer.parseInt(count) > 2){
            //发送三次了，不能再发送了
            System.out.println("今天的发送次数已经超过3次了");
            //关闭连接
            jedis.close();
        }

        //发送的验证码要放到redis中,设置过期时间为120s
        String vcode = getCode();
        jedis.setex(codeKey,120,vcode);
        jedis.close();
    }

    //3.验证码校验
    public static void getRedisCode(String phone,String code){
        //从redis中获取验证码
        Jedis jedis = new Jedis("192.168.50.128", 6379);
        jedis.auth("root");

        //验证码key
        String codeKey = "VerifyCode" + phone + ":code";
        String redisCode = jedis.get(codeKey);

        //判断
        if (redisCode.equals(code)){
            System.out.println("成功");
        }else {
            System.out.println("失败");
        }
        jedis.close();
    }
}

三、Redis与SpringBoot整合

Spring Boot整合Redis非常简单，只需要按如下步骤整合即可：

1. 在pom.xml文件中引入redis相关依赖

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

<!-- spring2.X集成redis所需common-pool2-->
<dependency>
	<groupId>org.apache.commons</groupId>
	<artifactId>commons-pool2</artifactId>
	<version>2.6.0</version>
</dependency>

2. application.properties配置redis配置

#Redis服务器地址
spring.redis.host=192.168.50.128
#Redis服务器连接端口
spring.redis.port=6379
#Redis数据库索引（默认为0）
spring.redis.database= 0
#连接超时时间（毫秒）
spring.redis.timeout=1800000
#连接池最大连接数（使用负值表示没有限制）
spring.redis.lettuce.pool.max-active=20
#最大阻塞等待时间(负数表示没限制)
spring.redis.lettuce.pool.max-wait=-1
#连接池中的最大空闲连接
spring.redis.lettuce.pool.max-idle=5
#连接池中的最小空闲连接
spring.redis.lettuce.pool.min-idle=0

3. 添加Redis配置类

@EnableCaching
@Configuration
public class RedisConfig extends CachingConfigurerSupport {
    @Bean
    public RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory factory) {
        RedisTemplate<String, Object> template = new RedisTemplate<>();
        RedisSerializer<String> redisSerializer = new StringRedisSerializer();
        Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);
        ObjectMapper om = new ObjectMapper();
        om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
        jackson2JsonRedisSerializer.setObjectMapper(om);
        template.setConnectionFactory(factory);
		//key序列化方式
        template.setKeySerializer(redisSerializer);
		//value序列化
        template.setValueSerializer(jackson2JsonRedisSerializer);
		//value hashmap序列化
        template.setHashValueSerializer(jackson2JsonRedisSerializer);
        return template;
    }

    @Bean
    public CacheManager cacheManager(RedisConnectionFactory factory) {
        RedisSerializer<String> redisSerializer = new StringRedisSerializer();
        Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);
		//解决查询缓存转换异常的问题
        ObjectMapper om = new ObjectMapper();
        om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
        jackson2JsonRedisSerializer.setObjectMapper(om);
		// 配置序列化（解决乱码的问题）,过期时间600秒
        RedisCacheConfiguration config = RedisCacheConfiguration.defaultCacheConfig()
                .entryTtl(Duration.ofSeconds(600))
                .serializeKeysWith(RedisSerializationContext.SerializationPair.fromSerializer(redisSerializer))
                .serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(jackson2JsonRedisSerializer))
                .disableCachingNullValues();
        RedisCacheManager cacheManager = RedisCacheManager.builder(factory)
                .cacheDefaults(config)
                .build();
        return cacheManager;
    }
}

4. 测试一下：RedisTestController中添加测试方法

@RestController
@RequestMapping("/redisTest")
public class RedisTestController {
    @Autowired
    private RedisTemplate redisTemplate;

    @GetMapping
    public String testRedis() {
        //设置值到redis
        redisTemplate.opsForValue().set("name","lucy");
        //从redis获取值
        String name = (String)redisTemplate.opsForValue().get("name");
        return name;
    }
}