Springboot整合Redis入门完整篇,零基础入门教学教程


记录一次简易集成Redis缓存 自定义Redisconfig配置 自定义序列化操作 加深印像

整合前提工具环境准备:

1、redis官网 https://redis.io/download

下载安装redis 

 运行成功

注意事项:

1,开启远程服务 放行防火墙 6379 端口 具体操作百度

2,配置

本地连接ip 就是127.0.0.1

如果在服务器端 要注释这行

3.配置 密码

还是在这这个文件redis.windows.conf 里面查找

requirepass

 4.

再把protected-mode=yesyes改为no,

下载Redis视图软件 http://www.pc6.com/softview/SoftView_450180.html#download

springboot整合redis开始

第一步配置导包

<dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-data-redis</artifactId>

</dependency> 
第二步 
实体类的配置
Redis读取数据都需要经过反序列化 不然读取失败 出错

要使用redis,实体类必须实现序列化接口
implements Serializable
否则会抛java.io.NotSerializableException异常。

反序列化读取Json数据
@JsonIgnoreProperties(ignoreUnknown = true)


配置反序列化类

FastJson2JsonRedisSerializer

代码如下
package com.ruoyi.project.system.role.controller;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.parser.ParserConfig;
import com.alibaba.fastjson.serializer.SerializerFeature;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.type.TypeFactory;
import org.apache.shiro.util.Assert;
import org.springframework.data.redis.serializer.RedisSerializer;
import org.springframework.data.redis.serializer.SerializationException;

import java.nio.charset.Charset;

public class FastJson2JsonRedisSerializer<T> implements RedisSerializer<T> {

    private ObjectMapper objectMapper = new ObjectMapper();
    public static final Charset DEFAULT_CHARSET = Charset.forName("UTF-8");

    private Class<T> clazz;

    static {
        ParserConfig.getGlobalInstance().setAutoTypeSupport(true);
        ParserConfig.getGlobalInstance().addAccept("com.openailab.oascloud");

    }

    public FastJson2JsonRedisSerializer(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 JSON.parseObject(str, clazz);
    }

    public void setObjectMapper(ObjectMapper objectMapper) {
        Assert.notNull(objectMapper, "'objectMapper' must not be null");
        this.objectMapper = objectMapper;
    }

    protected JavaType getJavaType(Class<?> clazz) {
        return TypeFactory.defaultInstance().constructType(clazz);
    }


}

配置application.yml

spring:
  redis:
    host: 127.0.0.1
    port: 6379
    password: root #如果没设置密码留空
    jedis:
      pool:
        max-active: 8
        max-wait: -1
        max-idle: 500
        min-idle: 0
    lettuce:
      shutdown-timeout: 0

配置RedisConfig

* 1) RedisTemplate(或StringRedisTemplate)虽然已经自动配置,但是不灵活(第一没有序列化,第二泛型为<Object, Object>不是我们想要的类型)
* 所以自己实现RedisTemplate或StringRedisTemplate)
* 2) 采用RedisCacheManager作为缓存管理器

package com.ruoyi.project.system.role.controller;


import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.cache.CacheManager;
import org.springframework.cache.annotation.CachingConfigurerSupport;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.cache.interceptor.KeyGenerator;
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.cache.RedisCacheWriter;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.*;

import java.lang.reflect.Method;
import java.time.Duration;



@Configuration
@EnableCaching
public class RedisConfig extends CachingConfigurerSupport {
    private RedisSerializer<String> keySerializer() {

        return new StringRedisSerializer();

    }

    //使用Jackson序列化器

    private RedisSerializer<Object> valueSerializer() {

        return new GenericJackson2JsonRedisSerializer();

    }

    @Bean

    public CacheManager cacheManager(RedisConnectionFactory redisConnectionFactory) {

        //缓存配置对象

        RedisCacheConfiguration redisCacheConfiguration = RedisCacheConfiguration.defaultCacheConfig();

        redisCacheConfiguration = redisCacheConfiguration.entryTtl(Duration.ofMinutes(30L)) //设置缓存的默认超时时间:30分钟

                .disableCachingNullValues()             //如果是空值,不缓存

                .serializeKeysWith(RedisSerializationContext.SerializationPair.fromSerializer(keySerializer()))         //设置key序列化器

                .serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer((valueSerializer())));  //设置value序列化器

        return RedisCacheManager

                .builder(RedisCacheWriter.nonLockingRedisCacheWriter(redisConnectionFactory))

                .cacheDefaults(redisCacheConfiguration).build();

    }

    @Override

    @Bean

    public KeyGenerator keyGenerator() {

        // TODO Auto-generated method stub

        return new KeyGenerator() {

            @Override

            public Object generate(Object object, Method method, Object... objects) {

                // TODO Auto-generated method stub

                StringBuilder sb = new StringBuilder();

                sb.append(object.getClass().getName());

                sb.append(method.getName());

                for (Object obj : objects) {

                    if (obj != null) {

                        sb.append(obj.toString());

                    }

                }

                return sb.toString();

            }

        };

    }





    @Bean
    public RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory redisConnectionFactory) {
        RedisTemplate<String, Object> redisTemplate = new RedisTemplate<String, Object>();
        redisTemplate.setConnectionFactory(redisConnectionFactory);
        FastJson2JsonRedisSerializer fastJson2JsonRedisSerializer = new FastJson2JsonRedisSerializer(Object.class);
        ObjectMapper objectMapper = new ObjectMapper();
        objectMapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        objectMapper.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
        fastJson2JsonRedisSerializer.setObjectMapper(objectMapper);

        StringRedisSerializer stringRedisSerializer = new StringRedisSerializer();
        // key采用String的序列化方式
        redisTemplate.setKeySerializer(stringRedisSerializer);
        // string的value采用fastJson序列化方式
        redisTemplate.setValueSerializer(fastJson2JsonRedisSerializer);
        // hash的key也采用String的序列化方式
        redisTemplate.setHashKeySerializer(stringRedisSerializer);
        // hash的value采用fastJson序列化方式
        redisTemplate.setHashValueSerializer(fastJson2JsonRedisSerializer);
        redisTemplate.afterPropertiesSet();
        return redisTemplate;
    }





}

 在启动类上面加上redis缓存注解

在conroller使用redis

@Cacheable只是一种注解使用方法 更多的使用方法自行研究扩展
 
@Cacheable(cacheNames = "product", key = "123")


访问controler

 第二次访问就会读取redis 记录一次简易集成

如何使用注解啦,这一步反而是最简单的.其实只用到了两个注解,@Cacheable和@CacheEvict.第一个注解代表从缓存中查询指定的key,如果有,从缓存中取,不再执行方法.如果没有则执
行方法,并且将方法的返回值和指定的key关联起来,放入到缓存中.而@CacheEvict则是从缓存中清除指定的key对应的数据.使用的代码如下:

@Cacheable(value="thisredis", key="'users_'+#id") public User findUser(Integer id) { User user = new User(); user.setUsername("hlhdidi"); user.setPassword("123"); user.setUid(id.longValue()); System.out.println("log4j2坏啦?"); logger.info("输入user,用户名:{},密码:{}",user.getUsername(),user.getPassword()); return user; } @CacheEvict(value="thisredis", key="'users_'+#id",condition="#id!=1") public void delUser(Integer id) { // 删除user System.out.println("user删除"); }
可以看出,我们用@Cacheable的value属性指定具体缓存,并通过key将其放入缓存中.这里key非常灵活,支持spring的el表达式,可以通过方法参数产生可变的key(见findUser方法),也可以通过其指定在
什么情况下,使用/不使用缓存(见delUser方法).

更多的操作和优化 可自行研究

 
 



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转载自www.cnblogs.com/dnghj/p/11729848.html
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