SpringBoot压缩json并写入Redis的示例代码_Java

1.为什么需要压缩json？

由于业务需要，存入redis中的缓存数据过大，占用了10+g的内存，内存作为重要资源，需要优化一下大对象缓存，采用gzip压缩存储，可以将 redis 的 kv 对大小缩小大约 7-8 倍，加快存储、读取速度

2.环境搭建

详建redis模块的docker目录

version: '3'
services:
  redis:
    image: registry.cn-hangzhou.aliyuncs.com/zhengqing/redis:6.0.8                   
    container_name: redis                                                             
    restart: unless-stopped                                                                  
    command: redis-server /etc/redis/redis.conf --requirepass 123456 --appendonly no
#    command: redis-server --requirepass 123456 --appendonly yes 
    environment:                        
      tz: asia/shanghai
      lang: en_us.utf-8
    volumes:                           
      - "./redis/data:/data"
      - "./redis/config/redis.conf:/etc/redis/redis.conf"  
    ports:                              
      - "6379:6379"

3.代码工程

实验目标

实验存入redis的json数据压缩和解压缩

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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactid>springboot-demo</artifactid>
        <groupid>com.et</groupid>
        <version>1.0-snapshot</version>
    </parent>
    <modelversion>4.0.0</modelversion>

    <artifactid>gzip</artifactid>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>
    <dependencies>
        <dependency>
            <groupid>org.springframework.boot</groupid>
            <artifactid>spring-boot-starter-web</artifactid>
        </dependency>

        <dependency>
            <groupid>org.springframework.boot</groupid>
            <artifactid>spring-boot-autoconfigure</artifactid>
        </dependency>
        <dependency>
            <groupid>org.springframework.boot</groupid>
            <artifactid>spring-boot-starter-test</artifactid>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupid>org.projectlombok</groupid>
            <artifactid>lombok</artifactid>
        </dependency>
        <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>
</project>

controller

package com.et.gzip.controller;

import com.et.gzip.model.user;
import lombok.extern.slf4j.slf4j;
import org.springframework.beans.factory.annotation.autowired;
import org.springframework.data.redis.core.redistemplate;
import org.springframework.web.bind.annotation.postmapping;
import org.springframework.web.bind.annotation.requestbody;
import org.springframework.web.bind.annotation.requestmapping;
import org.springframework.web.bind.annotation.restcontroller;

import java.util.hashmap;
import java.util.map;

@restcontroller
@slf4j
public class helloworldcontroller {
    @autowired
    private redistemplate redistemplatewithjackson;

    @postmapping("/hello")
    public user showhelloworld(@requestbody user user){
        log.info("user:"+ user);

        return user;
    }
    @postmapping("/redis")
    public user redis(@requestbody user user){
        log.info("user:"+ user);
        redistemplatewithjackson.opsforvalue().set("user",user);
        user redisuser = (user) redistemplatewithjackson.opsforvalue().get("user");
        return redisuser;
    }
}

redis压缩和解压缩配置

压缩类

package com.et.gzip.config;

import com.et.gzip.model.user;

import com.fasterxml.jackson.databind.objectmapper;
import com.fasterxml.jackson.databind.annotation.jsonserialize;
import lombok.extern.slf4j.slf4j;
import org.apache.tomcat.util.http.fileupload.ioutils;

import org.springframework.data.redis.serializer.jdkserializationredisserializer;
import org.springframework.data.redis.serializer.serializationexception;
import sun.misc.base64encoder;

import java.io.bytearrayinputstream;
import java.io.bytearrayoutputstream;
import java.text.simpledateformat;
import java.util.zip.gzipinputstream;
import java.util.zip.gzipoutputstream;

@slf4j
public class compressredis extends jdkserializationredisserializer {

    public static final int buffer_size = 4096;

    private jacksonredisserializer<user>  jacksonredisserializer;
    public compressredis() {
        this.jacksonredisserializer = getvalueserializer();
    }

    @override
    public byte[] serialize(object graph) throws serializationexception {
        if (graph == null) {
            return new byte[0];
        }
        bytearrayoutputstream bos = null;
        gzipoutputstream gzip = null;
        try {
            // serialize
            byte[] bytes = jacksonredisserializer.serialize(graph);
            log.info("bytes size{}",bytes.length);
            bos = new bytearrayoutputstream();
            gzip = new gzipoutputstream(bos);

            // compress
            gzip.write(bytes);
            gzip.finish();
            byte[] result = bos.tobytearray();

            log.info("result size{}",result.length);
            //return result;
            return new base64encoder().encode(result).getbytes();
        } catch (exception e) {
            throw new serializationexception("gzip serialization error", e);
        } finally {
            ioutils.closequietly(bos);
            ioutils.closequietly(gzip);
        }
    }

    @override
    public object deserialize(byte[] bytes) throws serializationexception {
        if (bytes == null || bytes.length == 0) {
            return null;
        }
        bytearrayoutputstream bos = null;
        bytearrayinputstream bis = null;
        gzipinputstream gzip = null;
        try {
            bos = new bytearrayoutputstream();
            byte[] compressed = new sun.misc.base64decoder().decodebuffer( new string(bytes));;
            bis = new bytearrayinputstream(compressed);
            gzip = new gzipinputstream(bis);
            byte[] buff = new byte[buffer_size];
            int n;


            // uncompress
            while ((n = gzip.read(buff, 0, buffer_size)) > 0) {
                bos.write(buff, 0, n);
            }
            //deserialize
            object result = jacksonredisserializer.deserialize(bos.tobytearray());
            return result;
        } catch (exception e) {
            throw new serializationexception("gzip deserizelie error", e);
        } finally {
            ioutils.closequietly(bos);
            ioutils.closequietly(bis);
            ioutils.closequietly(gzip);
        }
    }

    private static jacksonredisserializer<user> getvalueserializer() {
        jacksonredisserializer<user> jackson2jsonredisserializer = new jacksonredisserializer<>(user.class);
        objectmapper mapper=new objectmapper();
        jackson2jsonredisserializer.setobjectmapper(mapper);
        return jackson2jsonredisserializer;
    }

}

java序列化

package com.et.gzip.config;


import com.fasterxml.jackson.databind.javatype;
import com.fasterxml.jackson.databind.objectmapper;
import com.fasterxml.jackson.databind.type.typefactory;
import lombok.extern.slf4j.slf4j;

import org.springframework.data.redis.serializer.redisserializer;
import org.springframework.data.redis.serializer.serializationexception;
import org.springframework.lang.nullable;
import org.springframework.util.assert;

import java.nio.charset.charset;
import java.nio.charset.standardcharsets;

@slf4j
public class jacksonredisserializer<t> implements redisserializer<t> {
    public static final charset default_charset;
    private final javatype javatype;
    private objectmapper objectmapper = new objectmapper();

    public jacksonredisserializer(class<t> type) {
        this.javatype = this.getjavatype(type);
    }

    public jacksonredisserializer(javatype javatype) {
        this.javatype = javatype;
    }

    public t deserialize(@nullable byte[] bytes) throws serializationexception {
        if (bytes == null || bytes.length == 0) {
            return null;
        } else {
            try {
                return this.objectmapper.readvalue(bytes, 0, bytes.length, this.javatype);

            } catch (exception var3) {
                throw new serializationexception("could not read json: " + var3.getmessage(), var3);
            }
        }
    }

    public byte[] serialize(@nullable object t) throws serializationexception {
        if (t == null) {
            return  new byte[0];
        } else {
            try {
                return this.objectmapper.writevalueasbytes(t);
            } catch (exception var3) {
                throw new serializationexception("could not write json: " + var3.getmessage(), var3);
            }
        }
    }

    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);
    }

    static {
        default_charset = standardcharsets.utf_8;
    }
}

redis序列化

package com.et.gzip.config;

import com.et.gzip.model.user;
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.redisserializer;
import org.springframework.data.redis.serializer.stringredisserializer;


@configuration
public class rediswithjacksonconfig {


    @bean(name="redistemplatewithjackson")
    public redistemplate<string, user> redistemplate(lettuceconnectionfactory lettuceconnectionfactory) {

        compressredis  compressredis =  new compressredis();
        //redistemplate
        redistemplate<string, user> redistemplate = new redistemplate<>();
        redistemplate.setconnectionfactory(lettuceconnectionfactory);
        redisserializer<?> stringserializer = new stringredisserializer();
        redistemplate.setkeyserializer(stringserializer);
        redistemplate.setvalueserializer(compressredis);
        redistemplate.sethashkeyserializer(stringserializer);
        redistemplate.sethashvalueserializer(compressredis);
        redistemplate.afterpropertiesset();
        return redistemplate;
    }
}

application.yaml

spring:
  redis:
    host: 127.0.0.1
    port: 6379
    database: 10
    password: 123456
    timeout: 10s
    lettuce:
      pool:
        min-idle: 0
        max-idle: 8
        max-active: 8
        max-wait: -1ms
server:
  port: 8088
  compression:
    enabled: true
    mime-types: application/json,application/xml,text/html,text/plain,text/css,application/x-javascript

以上只是一些关键代码，所有代码请参见下面代码仓库

代码仓库

https://github.com/harries/springboot-demo(gzip)

4.测试

启动spring boot应用
用postman访问http://127.0.0.1:8088/redis

可以看到redis里面存储的是gzip压缩的内容

查看控制台日志

2024-08-26 14:37:56.445 info 43832 --- [nio-8088-exec-5] com.et.gzip.config.compressredis : bytes size371
2024-08-26 14:37:56.445 info 43832 --- [nio-8088-exec-5] com.et.gzip.config.compressredis : result size58

json经过gzip压缩，371-->58, 数据大小减少7-8倍

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SpringBoot压缩json并写入Redis的示例代码

2024年08月28日 • Java •我要评论