Redis入門-2-基本操作

原創

黄小泽

2019-04-17 10:39

前言，本篇博客將具體描述如何使用在springboot中引入redis作爲緩存使用

一、相關環境

spingboot 2.0

redis

二、代碼相關內容

1、添加依賴

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

        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.5</version>
        </dependency>

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.38</version>
        </dependency>

2、application.propertities添加一些配置

spring.redis.host=127.0.0.0
spring.redis.port=6379

3、添加RedisConfig.java

package com.example.config;

import com.example.Util.FastJsonSerializerForRedis;
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.StringRedisSerializer;

@Configuration
public class RedisConfig {

    @Bean
    public LettuceConnectionFactory lettuceConnectionFactory(){
        LettuceConnectionFactory lettuceConnectionFactory=new LettuceConnectionFactory();
        return lettuceConnectionFactory;
    }

    @Bean(name = "myRedisTemplate")
    public RedisTemplate functionDomainRedisTemplate(LettuceConnectionFactory lettuceConnectionFactory) {
        RedisTemplate redisTemplate = new RedisTemplate();
        redisTemplate.setKeySerializer(new StringRedisSerializer());
        redisTemplate.setHashKeySerializer(new StringRedisSerializer());
        redisTemplate.setHashValueSerializer(new FastJsonSerializerForRedis<>(Object.class));
        redisTemplate.setValueSerializer(new FastJsonSerializerForRedis<>(Object.class));
        // 開啓事務
        redisTemplate.setEnableTransactionSupport(true);
        redisTemplate.setConnectionFactory(lettuceConnectionFactory);
        return redisTemplate;
    }


}

4、自定義序列化（重要）

redis裏的數據都按json格式傳輸，如果不設置redis的序列化，redis裏存入的數據就都是亂碼，沒辦法在redis中直接查看數據

package com.example.Util;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.serializer.SerializerFeature;
import org.springframework.data.redis.serializer.RedisSerializer;
import org.springframework.data.redis.serializer.SerializationException;

import java.nio.charset.Charset;

public class FastJsonSerializerForRedis<T> implements RedisSerializer<T> {

    public static final Charset DEFAULT_CHARSET = Charset.forName("UTF-8");

    private Class<T> clazz;

    public FastJsonSerializerForRedis(Class<T> clazz) {
        super();
        this.clazz = clazz;
    }

    @Override
    public byte[] serialize(T t) throws SerializationException {
        if (t == null) {
            return new byte[0];
        }
        return JSON.toJSONString(t, SerializerFeature.WriteClassName).getBytes(DEFAULT_CHARSET);
    }

    @Override
    public T deserialize(byte[] bytes) throws SerializationException {
        if (bytes == null || bytes.length <= 0) {
            return null;
        }
        String str = new String(bytes, DEFAULT_CHARSET);
        return (T) JSON.parseObject(str, clazz);
    }
}

5、添加redis操作工具類

@Component
public class RedisUtil {

    @Resource(name = "myRedisTemplate")
    private RedisTemplate redisTemplate;

    public boolean set(String key, Object value) {
        try {
            redisTemplate.opsForValue().set(key, value);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }

    }

    public Object get(String key) {
        return key == null ? null : redisTemplate.opsForValue().get(key);
    }
}

代碼比較多，就不都放上來了，源碼在我github上有

6、添加redis結果