Redis入门（四）：springboot整合redis

案例一

• demo为chnx/springboot/redis01
• 创建springboot项目，导入redis依赖

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

• redis依赖中redis自动装配类为我们自动装配了jedis连接工厂和lettuce连接工厂

• 整合jedis，使用jedis操作redis

• pom.xml

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

• 配置yml

spring:
  redis:   # redis连接的配置
    database: 0
    host: 127.0.0.1
    port: 6379
    password: 123456
    jedis:     # 配置连接池
      pool:
        max-active: 100
        max-idle: 10
        max-wait: 100000
    timeout: 5000    # 超时时间
 

• 编写测试方法

@SpringBootTest
class Redis01ApplicationTests {
 
    @Autowired
    StringRedisTemplate redisTemplate;
 
    // redisTemplate也可以
//    @Autowired
//    RedisTemplate redisTemplate;
 
    @Test
    void testRedis(){
        ValueOperations<String, String> operations = redisTemplate.opsForValue();
        operations.set("hello","world");
        String hello = operations.get("hello");
        System.out.println(hello);
    }
}
 

• 右键运行，测试通过

• 控制层中使用

package com.chnq.redis01.controller;
 
import com.chnq.redis01.entity.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.ValueOperations;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
 
@RestController
@RequestMapping("/test")
public class JedisController {
 
    @Autowired
    RedisTemplate redisTemplate;
 
    @RequestMapping("/str")
    public String testStr1(){
        ValueOperations<String, String> operations = redisTemplate.opsForValue();
        operations.set("username","goudan");
        String name = operations.get("username");
        System.out.println(name);
        return name;
    }
 
    @RequestMapping(value = "/str1", method = RequestMethod.POST)
    public String listAll(@RequestBody User user){
        ValueOperations<String, String> operations = redisTemplate.opsForValue();
        operations.set("name", user.getName());
        operations.append("name", user.getAge());
        String name = operations.get("name");
        System.out.println(name);
        return "success";
    }
 
}
 

案例二

• demo为chnx/springboot/redis01
• 在案例一的基础上，使用lettuce操作redis
• 参考
• pom.xml

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>
<!-- 如果无法启动可不导入该依赖 -->
<!--        <dependency>-->
<!--            <groupId>org.apache.commons</groupId>-->
<!--            <artifactId>commons-pool2</artifactId>-->
<!--            <version>2.9.0</version>-->
<!--        </dependency>-->
 

• 配置yml

spring:
  redis:
    database: 0
    host: 192.168.96.192
    port: 6379
    password: 123456
    client-type: lettuce
    lettuce:
      pool:
        max-active: 8
        max-wait: -1ms
        max-idle: 8
        min-idle: 0
    timeout: 2000
 

• 编写LettuceRedisConfig配置类

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.GenericJackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.StringRedisSerializer;
import java.io.Serializable;
 
@Configuration
public class LettuceRedisConfig {
 
    @Bean
    public RedisTemplate<String, Serializable> redisTemplate(LettuceConnectionFactory connectionFactory) {
        RedisTemplate<String, Serializable> redisTemplate = new RedisTemplate<>();
        redisTemplate.setKeySerializer(new StringRedisSerializer());
        redisTemplate.setValueSerializer(new GenericJackson2JsonRedisSerializer());
        redisTemplate.setConnectionFactory(connectionFactory);
        return redisTemplate;
    }
 
}
 

• 编写RedisUtils工具类

import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Component;
import javax.annotation.Resource;
import java.util.concurrent.TimeUnit;
 
@Component
public class RedisUtils {
 
    @Resource
    private RedisTemplate<String, String> redisTemplate;
 
    /**
     * 设置key-value
     * @param key 键
     * @param value 值
     */
    public void set(String key, String value) {
        redisTemplate.opsForValue().set(key, value);
    }
 
    /**
     * 设置带生存时间的key-value
     * @param key 键
     * @param value 值
     * @param timeout 生存时间
     * @param unit 时间单位
     */
    public void set(String key, String value, long timeout,     TimeUnit unit) {
        redisTemplate.opsForValue().set(key, value, timeout, unit);
    }
 
    /**
     * 设置指定数据的生存时间。
     * @param key 键
     * @param time 生存时间（秒）
     */
    public void expire(String key, long time) {
        redisTemplate.expire(key, time, TimeUnit.SECONDS);
    }
 
    /**
     * 根据key，获取值
     * @param key 键
     * @return 获取到的值
     */
    public String get(String key) {
        return String.valueOf(redisTemplate.opsForValue().get(key));
    }
 
    /**
     * 删除指定信息。
     * @param key 键
     * @return 是否删除成功
     */
    public boolean delete(String key) {
        return redisTemplate.delete(key);
    }
 
}
 

• 测试

@SpringBootTest
public class LettuceTest {
    
    @Resource
    private RedisTemplate<String, String> redisTemplate;
 
    @Test
    void testRedis(){
        ValueOperations<String, String> operations = redisTemplate.opsForValue();
        operations.set("hello","world");
        String hello = operations.get("hello");
        System.out.println(hello);
    }
}
 

• 在需要的地方直接使用工具类的方法

import com.chnq.redis01.entity.User;
import com.chnq.redis01.utils.RedisUtils;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import javax.annotation.Resource;
 
@RestController
@RequestMapping("/test1")
public class LettuceController {
 
    // 在需要的类中引用
    @Resource
    private RedisUtils redisUtils;
 
    @RequestMapping(value = "/str1", method = RequestMethod.POST)
    public String listAll(@RequestBody User user){
        String name = user.getName();
        String age = user.getAge();
        redisUtils.set(name, age);
        return "success";
    }
 
}
 

案例三

• demo为chenx/jedis_redisdemo
• 参考
• 创建maven工程
• 引入依赖

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

• 测试

package com.atguigu.jedis;
 
import org.junit.Test;
import redis.clients.jedis.Jedis;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
 
public class JedisDemo1 {
 
    /**
     * 执行main方法会报错
     */
    public static void main(String[] args) {
        //创建Jedis对象
        Jedis jedis = new Jedis("192.168.0.102",6379);
        //测试
        String value = jedis.ping();
        System.out.println(value);
        jedis.close();
    }
 
    /**
     * 操作远程服务器上的redis连接超时
     */
    //操作zset
    @Test
    public void demo5() {
        // 创建Jedis对象
        Jedis jedis = new Jedis("192.168.0.102",6379);
        // 将一个或多个score\member存入key
        jedis.zadd("zset01",100d,"shanghai");
        jedis.zadd("zset01", 90d, "l4");
        jedis.zadd("zset01", 80d, "w5");
        jedis.zadd("zset01", 70d, "z6");
        // 获取数据后遍历
        Set<String> china = jedis.zrange("zset01", 0, 3);
        for (String e : china) {
            System.out.println(e);
        }
        // 关闭jedis连接
        jedis.close();
    }
 
    //操作hash
    @Test
    public void demo4() {
        //创建Jedis对象
        Jedis jedis = new Jedis("192.168.0.102",6379);
        // 给key集合中的field赋值value，集合中可有多个field-value对
        jedis.hset("hash1","userName","lisi");
        System.out.println(jedis.hget("hash1","userName"));
        // 给key集合赋值多个field-value对
        Map<String,String> map = new HashMap<String,String>();
        map.put("telphone","13810169999");
        map.put("address","atguigu");
        map.put("email","abc@163.com");
        jedis.hmset("hash2",map);
        List<String> result = jedis.hmget("hash2", "telphone","email");
        for (String element : result) {
            System.out.println(element);
        }
        jedis.close();
    }
 
    //操作set
    @Test
    public void demo3() {
        //创建Jedis对象
        Jedis jedis = new Jedis("192.168.0.102",6379);
        // 在key集合中添加多个members
        jedis.sadd("names","lucy");
        jedis.sadd("names","mary");
        Set<String> names = jedis.smembers("names");
        System.out.println(names);
        // 案例二
        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);
        }
        // 删除集合中的元素
        jedis.srem("orders", "order02");
        jedis.close();
    }
 
    //操作list
    @Test
    public void demo2() {
        //创建Jedis对象
        Jedis jedis = new Jedis("192.168.0.102",6379);
        // 向key集合中添加多个值
        jedis.lpush("key1","lucy","mary","jack");
        List<String> values = jedis.lrange("key1", 0, -1);
        System.out.println(values);
        jedis.close();
    }
 
    //操作key string
    @Test
    public void demo1() {
        //创建Jedis对象
        Jedis jedis = new Jedis("192.168.0.102",6379);
        //添加
        jedis.set("name","lucy");
        //获取
        String name = jedis.get("name");
        System.out.println(name);
        //设置多个key-value
        jedis.mset("k1","v1","k2","v2");
        List<String> mget = jedis.mget("k1", "k2");
        System.out.println(mget);
        // 获取数据库中所有值
        Set<String> keys = jedis.keys("*");
        for(String key : keys) {
            System.out.println(key);
        }
        jedis.close();
    }
 
}
 

案例四

• demo为chenx/redis_springboot
• 参考
• 创建springboot项目，导入所需依赖

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

• 使用的是RedisTemplate案例一中的方式

案例五

• Lettuce对象常用操作
• 案例为gitee/ chnx/ springboot / redis_demo01
• 新建一个maven项目，导入依赖

    <dependencies>
        <dependency>
            <groupId>io.lettuce</groupId>
            <artifactId>lettuce-core</artifactId>
            <version>5.0.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.28</version>
        </dependency>
    </dependencies>

• 编写测试方法

点击查看详情

package com.chen.redisdemo01.lettuce;
 
import io.lettuce.core.RedisClient;
import io.lettuce.core.RedisFuture;
import io.lettuce.core.RedisURI;
import io.lettuce.core.api.StatefulRedisConnection;
import io.lettuce.core.api.async.RedisStringAsyncCommands;
import io.lettuce.core.api.reactive.RedisStringReactiveCommands;
import io.lettuce.core.api.sync.RedisCommands;
import io.lettuce.core.cluster.RedisClusterClient;
import io.lettuce.core.cluster.api.StatefulRedisClusterConnection;
import io.lettuce.core.cluster.api.sync.RedisAdvancedClusterCommands;
import org.junit.Test;
import java.time.Duration;
import java.util.Arrays;
import java.util.List;
 
public class LettuceDemo {
 
    // 1. 普通方式使用
    @Test
    public void test1() {
        // client
        RedisClient client = RedisClient.create("redis://192.168.96.192");
        // connection, 线程安全的长连接，连接丢失时会自动重连，直到调用 close 关闭连接。
        StatefulRedisConnection<String, String> connection = client.connect();
        // sync, 默认超时时间为 60s.
        RedisCommands<String, String> redisCommands = connection.sync();
        redisCommands.set("name", "老五");
        String value = redisCommands.get("name");
        System.out.println("姓名："+value);
        // close connection
        connection.close();
        // shutdown
        client.shutdown();
    }
 
    // 2. 普通方式使用
    @Test
    public void test2() {
        // client
        RedisClient client = RedisClient.create("redis://192.168.96.192");
        // connection, 线程安全的长连接，连接丢失时会自动重连，直到调用 close 关闭连接。
        StatefulRedisConnection<String, String> connection = client.connect();
        // sync, 默认超时时间为 60s.
        RedisCommands<String, String> redisCommands = connection.sync();
        redisCommands.sadd("k1", "v1");
        redisCommands.sadd("k1", "v2");
        String value = redisCommands.spop("k1");
        int num = Math.toIntExact(redisCommands.scard("k1"));
        System.out.println("值：" + value + "+" + "集合个数：" + num);
        // close connection
        connection.close();
        // shutdown
        client.shutdown();
    }
 
    // 3. 集群方式使用：连接多台redis服务器
    @Test
    public void test3() {
        //创建RedisURI的两种方式
        RedisURI redisURI1 = RedisURI.create("redis://192.168.96.192:6379");
        RedisURI redisURI2 = RedisURI.Builder.redis("192.168.96.192").withPort(6381).withDatabase(0).build();
        List<RedisURI> list = Arrays.asList(redisURI1,redisURI2);
        RedisClusterClient client = RedisClusterClient.create(list);
        //超时时间
        client.setDefaultTimeout(Duration.ofSeconds(20));
        StatefulRedisClusterConnection<String, String> connect = client.connect();
        /* 同步执行的命令 */
        RedisAdvancedClusterCommands<String, String> commands = connect.sync();
        commands.set("name1", "老五");
        String value = commands.get("name1");
        System.out.println("姓名：" + value);
 
        /*  异步执行的命令  */
//      RedisAdvancedClusterAsyncCommands<String, String> commands= connect.async();
//      RedisFuture<String> future = commands.get("test2");
//      try {
//          String str = future.get();
//          System.out.println(str);
//      } catch (InterruptedException e) {
//          e.printStackTrace();
//      } catch (ExecutionException e) {
//          e.printStackTrace();
//      }
 
        connect.close();
        client.shutdown();
    }
 
    // 异步调用
    @Test
    public void test4() throws Exception {
        // client
        RedisClient client = RedisClient.create("redis://192.168.96.192:6379");
        StatefulRedisConnection<String, String> connection = client.connect();
 
        // async
        RedisStringAsyncCommands<String, String> asyncCommands = connection.async();
        asyncCommands.set("name1", "老五");
        RedisFuture<String> future = asyncCommands.get("name1");
        future.thenAccept((str) -> {
            System.out.println("姓名：" + str);
        });
 
        System.out.println("END");
        Thread.sleep(10*1000);
        connection.close();
        client.shutdown();
    }
 
    // reactive方式调用
    @Test
    public void test5() throws Exception {
        // client
        RedisClient client = RedisClient.create("redis://192.168.96.192:6379");
        // connect
        StatefulRedisConnection<String, String> connection = client.connect();
 
        // reactive
        RedisStringReactiveCommands<String, String> reactiveCommands = connection.reactive();
        reactiveCommands.set("name", "老五");
        reactiveCommands.get("name").subscribe((str) -> {
            System.out.println("name：" + str);
        });
 
        System.out.println("END");
        Thread.sleep(10 * 1000);
        connection.close();
        client.shutdown();
    }
 
}
 

案例六

• 参考
• 案例为为gitee/ chnx/ springboot / redis02
• 新建一个springboot项目，导入依赖

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!-- springboot整合redis依赖，使用lettuce操作redis -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>
<!--        <dependency>-->
<!--            <groupId>org.apache.commons</groupId>-->
<!--            <artifactId>commons-pool2</artifactId>-->
<!--            <version>2.9.0</version>-->
<!--        </dependency>-->
    </dependencies>

• 配置yml

server:
  port: 8080
 
spring:
  redis:
    database: 0
    host: 192.168.96.192
    password: 123456
    client-type: lettuce
    lettuce:
      pool:
        max-idle: 8
        min-idle: 0
        max-active: 8
        max-wait: -1
    timeout: 30000
 

• 编写配置类

package com.chnq.redis01.config;
 
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.GenericJackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.StringRedisSerializer;
 
@Configuration
public class RedisConfig {
 
    @Bean
    public RedisTemplate<String, Object> redisTemplate(LettuceConnectionFactory redisConnectionFactory){
        RedisTemplate<String, Object> redisTemplate = new RedisTemplate<String, Object>();
        redisTemplate.setKeySerializer(new StringRedisSerializer());
        redisTemplate.setValueSerializer(new GenericJackson2JsonRedisSerializer());
        redisTemplate.setHashKeySerializer(new StringRedisSerializer());
        redisTemplate.setHashValueSerializer(new GenericJackson2JsonRedisSerializer());
        redisTemplate.setConnectionFactory(redisConnectionFactory);
        return redisTemplate;
    }
 
}
 

• 编写工具类

点击查看详情

package com.chnq.redis01.utils;
 
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.TimeUnit;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Component;
import org.springframework.util.CollectionUtils;
 
@Component
public final class RedisUtils {
 
    @Autowired
    private RedisTemplate<String, Object> redisTemplate;
 
    /**
     * 指定缓存失效时间
     * @param key 键
     * @param time 时间(秒)
     * @return
     */
    public boolean expire(String key, long time) {
        try {
            if (time > 0) {
                redisTemplate.expire(key, time, TimeUnit.SECONDS);
            }
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }
    /**
     * 根据key 获取过期时间
     * @param key 键 不能为null
     * @return 时间(秒) 返回0代表为永久有效
     */
    public long getExpire(String key) {
        return redisTemplate.getExpire(key, TimeUnit.SECONDS);
    }
    /**
     * 判断key是否存在
     * @param key 键
     * @return true 存在 false不存在
     */
    public boolean hasKey(String key) {
        try {
            return redisTemplate.hasKey(key);
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }
    /**
     * 删除缓存
     * @param key 可以传一个值 或多个
     */
    @SuppressWarnings("unchecked")
    public void del(String... key) {
        if (key != null && key.length > 0) {
            if (key.length == 1) {
                redisTemplate.delete(key[0]);
            } else {
                redisTemplate.delete((Collection<String>) CollectionUtils.arrayToList(key));
            }
        }
    }
    // ============================String=============================
    /**
     * 普通缓存获取
     * @param key 键
     * @return 值
     */
    public Object get(String key) {
        return key == null ? null : redisTemplate.opsForValue().get(key);
    }
    /**
     * 普通缓存放入
     * @param key 键
     * @param value 值
     * @return true成功 false失败
     */
    public boolean set(String key, Object value) {
        try {
            redisTemplate.opsForValue().set(key, value);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }
    /**
     * 普通缓存放入并设置时间
     * @param key 键
     * @param value 值
     * @param time 时间(秒) time要大于0 如果time小于等于0 将设置无限期
     * @return true成功 false 失败
     */
    public boolean set(String key, Object value, long time) {
        try {
            if (time > 0) {
                redisTemplate.opsForValue().set(key, value, time, TimeUnit.SECONDS);
            } else {
                set(key, value);
            }
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }
    /**
     * 递增
     * @param key 键
     * @param delta 要增加几(大于0)
     * @return
     */
    public long incr(String key, long delta) {
        if (delta < 0) {
            throw new RuntimeException("递增因子必须大于0");
        }
        return redisTemplate.opsForValue().increment(key, delta);
    }
    /**
     * 递减
     * @param key 键
     * @param delta 要减少几(小于0)
     * @return
     */
    public long decr(String key, long delta) {
        if (delta < 0) {
            throw new RuntimeException("递减因子必须大于0");
        }
        return redisTemplate.opsForValue().increment(key, -delta);
    }
    // ================================Map=================================
    /**
     * HashGet
     * @param key 键 不能为null
     * @param item 项 不能为null
     * @return 值
     */
    public Object hget(String key, String item) {
        return redisTemplate.opsForHash().get(key, item);
    }
    /**
     * 获取hashKey对应的所有键值
     * @param key 键
     * @return 对应的多个键值
     */
    public Map<Object, Object> hmget(String key) {
        return redisTemplate.opsForHash().entries(key);
    }
    /**
     * HashSet
     * @param key 键
     * @param map 对应多个键值
     * @return true 成功 false 失败
     */
    public boolean hmset(String key, Map<String, Object> map) {
        try {
            redisTemplate.opsForHash().putAll(key, map);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }
    /**
     * HashSet 并设置时间
     * @param key 键
     * @param map 对应多个键值
     * @param time 时间(秒)
     * @return true成功 false失败
     */
    public boolean hmset(String key, Map<String, Object> map, long time) {
        try {
            redisTemplate.opsForHash().putAll(key, map);
            if (time > 0) {
                expire(key, time);
            }
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }
    /**
     * 向一张hash表中放入数据,如果不存在将创建
     * @param key 键
     * @param item 项
     * @param value 值
     * @return true 成功 false失败
     */
    public boolean hset(String key, String item, Object value) {
        try {
            redisTemplate.opsForHash().put(key, item, value);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }
    /**
     * 向一张hash表中放入数据,如果不存在将创建
     * @param key 键
     * @param item 项
     * @param value 值
     * @param time 时间(秒) 注意:如果已存在的hash表有时间,这里将会替换原有的时间
     * @return true 成功 false失败
     */
    public boolean hset(String key, String item, Object value, long time) {
        try {
            redisTemplate.opsForHash().put(key, item, value);
            if (time > 0) {
                expire(key, time);
            }
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }
    /**
     * 删除hash表中的值
     * @param key 键 不能为null
     * @param item 项 可以使多个 不能为null
     */
    public void hdel(String key, Object... item) {
        redisTemplate.opsForHash().delete(key, item);
    }
    /**
     * 判断hash表中是否有该项的值
     * @param key 键 不能为null
     * @param item 项 不能为null
     * @return true 存在 false不存在
     */
    public boolean hHasKey(String key, String item) {
        return redisTemplate.opsForHash().hasKey(key, item);
    }
    /**
     * hash递增 如果不存在,就会创建一个 并把新增后的值返回
     * @param key 键
     * @param item 项
     * @param by 要增加几(大于0)
     * @return
     */
    public double hincr(String key, String item, double by) {
        return redisTemplate.opsForHash().increment(key, item, by);
    }
    /**
     * hash递减
     * @param key 键
     * @param item 项
     * @param by 要减少记(小于0)
     * @return
     */
    public double hdecr(String key, String item, double by) {
        return redisTemplate.opsForHash().increment(key, item, -by);
    }
    // ============================set=============================
    /**
     * 根据key获取Set中的所有值
     * @param key 键
     * @return
     */
    public Set<Object> sGet(String key) {
        try {
            return redisTemplate.opsForSet().members(key);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }
    /**
     * 根据value从一个set中查询,是否存在
     * @param key 键
     * @param value 值
     * @return true 存在 false不存在
     */
    public boolean sHasKey(String key, Object value) {
        try {
            return redisTemplate.opsForSet().isMember(key, value);
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }
    /**
     * 将数据放入set缓存
     * @param key 键
     * @param values 值 可以是多个
     * @return 成功个数
     */
    public long sSet(String key, Object... values) {
        try {
            return redisTemplate.opsForSet().add(key, values);
        } catch (Exception e) {
            e.printStackTrace();
            return 0;
        }
    }
    /**
     * 将set数据放入缓存
     * @param key 键
     * @param time 时间(秒)
     * @param values 值 可以是多个
     * @return 成功个数
     */
    public long sSetAndTime(String key, long time, Object... values) {
        try {
            Long count = redisTemplate.opsForSet().add(key, values);
            if (time > 0)
                expire(key, time);
            return count;
        } catch (Exception e) {
            e.printStackTrace();
            return 0;
        }
    }
    /**
     * 获取set缓存的长度
     * @param key 键
     * @return
     */
    public long sGetSetSize(String key) {
        try {
            return redisTemplate.opsForSet().size(key);
        } catch (Exception e) {
            e.printStackTrace();
            return 0;
        }
    }
    /**
     * 移除值为value的
     * @param key 键
     * @param values 值 可以是多个
     * @return 移除的个数
     */
    public long setRemove(String key, Object... values) {
        try {
            Long count = redisTemplate.opsForSet().remove(key, values);
            return count;
        } catch (Exception e) {
            e.printStackTrace();
            return 0;
        }
    }
    // ===============================list=================================
    /**
     * 获取list缓存的内容
     * @param key 键
     * @param start 开始
     * @param end 结束 0 到 -1代表所有值
     * @return
     */
    public List<Object> lGet(String key, long start, long end) {
        try {
            return redisTemplate.opsForList().range(key, start, end);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }
    /**
     * 获取list缓存的长度
     * @param key 键
     * @return
     */
    public long lGetListSize(String key) {
        try {
            return redisTemplate.opsForList().size(key);
        } catch (Exception e) {
            e.printStackTrace();
            return 0;
        }
    }
    /**
     * 通过索引 获取list中的值
     * @param key 键
     * @param index 索引 index>=0时， 0 表头，1 第二个元素，依次类推；index<0时，-1，表尾，-2倒数第二个元素，依次类推
     * @return
     */
    public Object lGetIndex(String key, long index) {
        try {
            return redisTemplate.opsForList().index(key, index);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }
    /**
     * 将list放入缓存
     * @param key 键
     * @param value 值
     * @param time 时间(秒)
     * @return
     */
    public boolean lSet(String key, Object value) {
        try {
            redisTemplate.opsForList().rightPush(key, value);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }
    /**
     * 将list放入缓存
     * @param key 键
     * @param value 值
     * @param time 时间(秒)
     * @return
     */
    public boolean lSet(String key, Object value, long time) {
        try {
            redisTemplate.opsForList().rightPush(key, value);
            if (time > 0)
                expire(key, time);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }
    /**
     * 将list放入缓存
     * @param key 键
     * @param value 值
     * @param time 时间(秒)
     * @return
     */
    public boolean lSet(String key, List<Object> value) {
        try {
            redisTemplate.opsForList().rightPushAll(key, value);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }
    /**
     * 将list放入缓存
     *
     * @param key 键
     * @param value 值
     * @param time 时间(秒)
     * @return
     */
    public boolean lSet(String key, List<Object> value, long time) {
        try {
            redisTemplate.opsForList().rightPushAll(key, value);
            if (time > 0)
                expire(key, time);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }
    /**
     * 根据索引修改list中的某条数据
     * @param key 键
     * @param index 索引
     * @param value 值
     * @return
     */
    public boolean lUpdateIndex(String key, long index, Object value) {
        try {
            redisTemplate.opsForList().set(key, index, value);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }
    /**
     * 移除N个值为value
     * @param key 键
     * @param count 移除多少个
     * @param value 值
     * @return 移除的个数
     */
    public long lRemove(String key, long count, Object value) {
        try {
            Long remove = redisTemplate.opsForList().remove(key, count, value);
            return remove;
        } catch (Exception e) {
            e.printStackTrace();
            return 0;
        }
    }
 
}
 

• 编写测试类测试

import com.chnq.redis01.utils.RedisUtils;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.ValueOperations;
import javax.annotation.Resource;
 
@SpringBootTest
public class LettuceTest {
 
    @Resource
    private RedisTemplate<String, String> redisTemplate;
 
    @Test
    void testRedis(){
        ValueOperations<String, String> operations = redisTemplate.opsForValue();
        operations.set("hello1","world");
        String hello = operations.get("hello1");
        System.out.println(hello);
    }
 
}
 

• 编写实体类

import lombok.Data;
 
@Data
public class User {
    private Integer id;
    private String name;
    private String age;
}
 

• 在controller层测试

import com.chnq.redis01.entity.User;
import com.chnq.redis01.utils.RedisUtils;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import javax.annotation.Resource;
 
@RestController
@RequestMapping("/test")
public class TestController {
 
    // 在需要的类中引用
    @Resource
    private RedisUtils redisUtils;
 
    @RequestMapping(value = "/str1", method = RequestMethod.POST)
    public String listAll(@RequestBody User user){
        String name = user.getName();
        String age = user.getAge();
        redisUtils.set(name, age);
        return "success";
    }
 
}
 

案例七

• 参考
• 案例为gitee/ chenx/ redis-demo02
• 当前案例为mybatis plus + redis缓存
• redis配置类

import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.JsonTypeInfo;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import com.fasterxml.jackson.databind.jsontype.PolymorphicTypeValidator;
import com.fasterxml.jackson.databind.jsontype.impl.LaissezFaireSubTypeValidator;
import com.fasterxml.jackson.datatype.jdk8.Jdk8Module;
import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
import com.fasterxml.jackson.datatype.jsr310.deser.LocalDateDeserializer;
import com.fasterxml.jackson.datatype.jsr310.deser.LocalDateTimeDeserializer;
import com.fasterxml.jackson.datatype.jsr310.ser.LocalDateSerializer;
import com.fasterxml.jackson.datatype.jsr310.ser.LocalDateTimeSerializer;
import com.fasterxml.jackson.module.paramnames.ParameterNamesModule;
import org.springframework.cache.CacheManager;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.cache.RedisCacheConfiguration;
import org.springframework.data.redis.cache.RedisCacheManager;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.GenericJackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.RedisSerializationContext;
import org.springframework.data.redis.serializer.StringRedisSerializer;
import java.time.Duration;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
 
/**
 * @Description: 自定义 RedisTemplate + 配置缓存管理器(作用于注解缓存)
 * 注意!自定义序列化后必须配置java8时间类型的序列化否则会报错; 也可以使用以下两个注解在对应字段上替代
 * @JsonDeserialize(using = LocalDateTimeDeserializer.class)
 * @JsonSerialize(using = LocalDateTimeSerializer.class)
 */
@EnableCaching
@Configuration
public class RedisConfig {
 
    // 缓存过期时间(秒)
    private static final Long EXPIRE_TIME = 60L;
 
    /**
     * 自定义Key为String类型Value为Object类型的Redis操作模板
     * 注意SpringDataRedis本身提供了: StringRedisTemplate, RedisTemplate<Object,Object> 两个不同类型的操作模板
     */
    @Bean(name = "stringByObjectTemplate")
    public RedisTemplate<String, Object> stringByObjectTemplate(RedisConnectionFactory redisConnectionFactory) {
        RedisTemplate<String,Object> template = new RedisTemplate<>();
        template.setConnectionFactory(redisConnectionFactory);
 
        //使用Jackson2JsonRedisSerializer进行序列化
        Jackson2JsonRedisSerializer<Object> jsonRedisSerializer = new Jackson2JsonRedisSerializer<>(Object.class);
        ObjectMapper objectMapper = new ObjectMapper();
        objectMapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        objectMapper.activateDefaultTyping(LaissezFaireSubTypeValidator.instance, ObjectMapper.DefaultTyping.NON_FINAL);
 
        // 序列化 java8时间类型
        JavaTimeModule timeModule = new JavaTimeModule();
        timeModule.addDeserializer(LocalDate.class, new LocalDateDeserializer(DateTimeFormatter.ofPattern("yyyy-MM-dd")));
        timeModule.addDeserializer(LocalDateTime.class, new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
        timeModule.addSerializer(LocalDate.class, new LocalDateSerializer(DateTimeFormatter.ofPattern("yyyy-MM-dd")));
        timeModule.addSerializer(LocalDateTime.class, new LocalDateTimeSerializer(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
        objectMapper.registerModule(timeModule);
        jsonRedisSerializer.setObjectMapper(objectMapper);
 
        //自定义String序列化配置
        StringRedisSerializer stringRedisSerializer = new StringRedisSerializer();
        //key使用String的序列化方式
        template.setKeySerializer(stringRedisSerializer);
        //hash的key也是用String的序列化方式
        template.setHashKeySerializer(stringRedisSerializer);
        //value的key使用jackson的序列化方式
        template.setValueSerializer(jsonRedisSerializer);
        //hash的value也是用jackson的序列化方式
        template.setHashValueSerializer(jsonRedisSerializer);
        //配置完之后将所有的properties设置进去
        template.afterPropertiesSet();
        return template;
    }
 
    /**
     * cacheManager 缓存管理器, 有关缓存的配置都在这里进行配置
     * 修改注解缓存序列化方式, 不使用JDK默认的序列化方式, 并配置java8序列化和反序列化配置
     * 参考: https://www.cnblogs.com/yanlong300/p/11905978.html
     * 核心类:
     * GenericJackson2JsonRedisSerializer
     * Jackson2JsonRedisSerializer
     * ObjectMapper
     */
    @Bean
    public CacheManager cacheManager(RedisConnectionFactory factory) {
        // 配置序列化java8时间类型
        ObjectMapper objectMapper = new ObjectMapper()
                .registerModule(new ParameterNamesModule())
                .registerModule(new Jdk8Module())
                .registerModule(new JavaTimeModule());
        objectMapper.activateDefaultTyping(LaissezFaireSubTypeValidator.instance , ObjectMapper.DefaultTyping.NON_FINAL, JsonTypeInfo.As.PROPERTY);
        objectMapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
 
        StringRedisSerializer stringRedisSerializer = new StringRedisSerializer();
        GenericJackson2JsonRedisSerializer genericJackson2JsonRedisSerializer = new GenericJackson2JsonRedisSerializer(objectMapper);
        // 配置自定义序列化方式和失效时间
        RedisCacheConfiguration redisCacheConfiguration = RedisCacheConfiguration.defaultCacheConfig()
                .serializeKeysWith(RedisSerializationContext.SerializationPair.fromSerializer(stringRedisSerializer))
                .serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(genericJackson2JsonRedisSerializer))
                .entryTtl(Duration.ofSeconds(EXPIRE_TIME));
 
        return RedisCacheManager.builder(factory).cacheDefaults(redisCacheConfiguration).build();
    }
 
}
 

案例八

• 参考为bili_shiro_redis
• 使用redis作为缓存数据库存储权限信息，核心代码如下

package com.baizhi.springboot_jsp_shiro.shiro.cache;
 
import com.baizhi.springboot_jsp_shiro.utils.ApplicationContextUtils;
import org.apache.shiro.cache.Cache;
import org.apache.shiro.cache.CacheException;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.StringRedisSerializer;
import java.util.Collection;
import java.util.Set;
 
//自定义redis缓存的实现
public class RedisCache<k,v> implements Cache<k,v> {
 
    private String cacheName;
 
    public RedisCache() {
    }
 
    public RedisCache(String cacheName) {
        this.cacheName = cacheName;
    }
 
    @Override
    public v get(k k) throws CacheException {
        System.out.println("get key:"+k);
        return (v) getRedisTemplate().opsForHash().get(this.cacheName,k.toString());
    }
 
    @Override
    public v put(k k, v v) throws CacheException {
        System.out.println("put key: "+k);
        System.out.println("put value:"+v);
        getRedisTemplate().opsForHash().put(this.cacheName,k.toString(),v);
        return null;
    }
 
    @Override
    public v remove(k k) throws CacheException {
        System.out.println("=============remove=============");
        return (v) getRedisTemplate().opsForHash().delete(this.cacheName,k.toString());
    }
 
    @Override
    public void clear() throws CacheException {
        System.out.println("=============clear==============");
        getRedisTemplate().delete(this.cacheName);
    }
 
    @Override
    public int size() {
        return getRedisTemplate().opsForHash().size(this.cacheName).intValue();
    }
 
    @Override
    public Set<k> keys() {
        return getRedisTemplate().opsForHash().keys(this.cacheName);
    }
 
    @Override
    public Collection<v> values() {
        return getRedisTemplate().opsForHash().values(this.cacheName);
    }
 
    private RedisTemplate getRedisTemplate(){
        RedisTemplate redisTemplate = (RedisTemplate) ApplicationContextUtils.getBean("redisTemplate");
        redisTemplate.setKeySerializer(new StringRedisSerializer());
        redisTemplate.setHashKeySerializer(new StringRedisSerializer());
        return redisTemplate;
    }
 
}
 

案例总结

• 案例3创建maven工程，使用jedis直接操作redis

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

• 案例5创建maven工程，使用lettuce直接操作redis

<dependency>
     <groupId>io.lettuce</groupId>
     <artifactId>lettuce-core</artifactId>
     <version>5.0.4.RELEASE</version>
</dependency>

• 案例1创建spring boot项目，使用jedis连接redis，使用redisTemplate操作redis

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

• 案例2创建spring boot项目，使用lettuce连接redis，编写RedisUtils操作redis

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

• 案例6新建spring boot项目，使用lettuce连接redis，编写RedisUtils操作redis，redis工具类更加全面

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