[Java知识库]redis整合springBoot

redis整合springBoot

1.pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.6.5</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.xing</groupId>
    <artifactId>redissb</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>redissb</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>


    <dependencies>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>2.6.5</version>
        </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>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
            <version>2.6.4</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13.1</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>5.3.17</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.73</version>
        </dependency>
      


    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

2.application.yml

server:
  port: 8899
spring:
  redis:
    #host: 192.168.230.133
    host: localhost
    port: 6379
    #password: root
    database: 6

3.Redis的配置类—防止中文乱码

redis配置类
主要是配置了redis的序列化规则，替换默认的jdkSerializer
key的序列化规则用StringRedisSerializer
value的序列化规则用jackson2JsonRedisSerializer

package com.xing.redissb.util;

import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.StringRedisSerializer;


/**
 * redis配置类
 * 主要是配置了redis的序列化规则，替换默认的jdkSerializer
 * key的序列化规则用StringRedisSerializer
 * value的序列化规则用jackson2JsonRedisSerializer
 */
@Configuration
public class RedisConfig {

    //交给spring管理bean
    @Bean
    public RedisTemplate<Object,Object> redisTemplate(RedisConnectionFactory connectionFactory){
        RedisTemplate<Object, Object> redisTemplate = new RedisTemplate<>();
        redisTemplate.setConnectionFactory(connectionFactory);

        //使用Jackson2JsonRedisSerialize替换默认序列化
        Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);

        ObjectMapper objectMapper = new ObjectMapper();
        objectMapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        objectMapper.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);

        jackson2JsonRedisSerializer.setObjectMapper(objectMapper);

        //设置key和value的序列化规则
        redisTemplate.setKeySerializer(new StringRedisSerializer());
        redisTemplate.setValueSerializer(jackson2JsonRedisSerializer);

        redisTemplate.setHashKeySerializer(new StringRedisSerializer());
        redisTemplate.setHashValueSerializer(jackson2JsonRedisSerializer);

        redisTemplate.afterPropertiesSet();
        return redisTemplate;

    }


}

4.测试redis的String、Hash、List，进行数据的存取，设置过期时间

redis的list类型:双向链表形式，可以从最左边或者最右边进行添加元素和取出元素。

redis的String类型：一个key对应一个value

redis的hash类型:一个key对应一个map：key和value

package com.xing.redissb;


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.data.redis.core.RedisTemplate;
import org.springframework.test.context.junit4.SpringRunner;

import java.util.*;
import java.util.concurrent.TimeUnit;

@SpringBootTest
@RunWith(SpringRunner.class)
public class RedisTest {

    @Autowired
    private RedisTemplate redisTemplate;

    @Test
    public void testRedis(){
        String key="hello";
        redisTemplate.opsForValue().set("hello","你好");

        String response = (String) redisTemplate.opsForValue().get(key);
        System.out.println("redis里key为hello的value："+response);
    }


    @Test
    public void testKeyOps(){
        //测试redis操作key-value形式
      Set<String> keySet = new HashSet<>();

      String key1="name";
      keySet.add(key1);
      //存储简单的key-value，并设置过期时间
      redisTemplate.opsForValue().set(key1,"key1的value值",1, TimeUnit.MINUTES);

      String key2="token:user1";
      String key3="token:user2";

      keySet.add(key2);
      keySet.add(key3);

      redisTemplate.opsForValue().set(key2,"{\"name2\":\"ekonw2\"},\"role2\":\"admin2\"");
      redisTemplate.opsForValue().set(key3,"{\"name3\":\"ekonw3\"},\"role3\":\"admin3\"");

      //根据key的集合获取多个value的值
        List<String> valueList = redisTemplate.opsForValue().multiGet(keySet);

        for (String s : valueList) {
            System.out.println("============");
            System.out.println(s);
        }
    }

    @Test
    public void testHashOps(){
        String key="hash";
        //单次往hash中存放一个数据
        redisTemplate.opsForHash().put(key,"1","你好");

        Map<String , Object> map = new HashMap<>();
        map.put("2","hello");
        map.put("3a","china==3a");

        //一次性向hash中存放一个map值
        redisTemplate.opsForHash().putAll(key,map);

        //获取hash下的所有key和value
        Map<String,Object> resultMap = redisTemplate.opsForHash().entries(key);
        for (String hashKey : resultMap.keySet()) {
            System.out.println(hashKey+":"+resultMap.get(hashKey));
        }

        //弄到4点，把redis这块弄完，整理成文档，记录下来，然后再回顾mongoDB
        //把mongoDB弄完就好啦
    }


    @Test
    public void testListOps(){
        String listKey="list";

        //从list最左边插入两条数据
        redisTemplate.opsForList().leftPush(listKey,"first value");
        redisTemplate.opsForList().leftPush(listKey,"第二个数据从最左边");

        //从list最右边插入一条数据
        redisTemplate.opsForList().rightPush(listKey,"第三个数据从最右边插入数据");

        ArrayList<Object> list = new ArrayList<>();
        list.add("hello");
        list.add("nihao");
        list.add(23456);
        list.add(false);

        //从list右边批量插入数据
        redisTemplate.opsForList().rightPushAll(listKey,list);

        Long size = redisTemplate.opsForList().size(listKey);
        if(size>0){
            for (int i=0;i<size-1;i++){
                //从list的最左边开始读取list的数据，注意pop会导致出栈，也就是数据被取出来了
                //redis中没有这个值啦
                //此处我们读取size-1条数据，仅保留一条数据
                System.out.println(i+":"+redisTemplate.opsForList().leftPop(listKey).toString());
            }
        }


    }



}