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redis 存储对象的方法对比分析

时间:2021-08-19 18:01     来源/作者:xiaoxiaoyunlu

redis 存储对象的方法对比

问题背景:

原来项目里面全部是直接redis存储对象的json数据,需要频繁的序列化和反序列化,后来考虑更换项目中的redis存储对象为hash对象存储的,但是获取后不能方便的set get操作,很是蛋疼,怎么才能解决这个问题呢?

1.1 直接存储对象的json

存放redis的时候,直接先用fastjson 或者 jackjson或者gson把对象序列化为json数据,然后用直接存放,key表示用户id或许和openid,value则是对象的json数据

redis 存储对象的方法对比分析

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public string get(string key) {
object value = redistemplate.boundvalueops(key).get();
return (string) value;
}
public void set(string key, string json) {
if (json == null) {
return;
}
redistemplate.boundvalueops(key).set(json);
}

优点:虽然需要序列化和反序列化,但是可以直接操作对象的方法,方便快捷

缺点:需要序列化和反序列化,并且修改单个字段,需要获取整个json,修改后,序列化保存,浪费空间,浪费时间,效率低

1.2 采用redis hash key field value 存储

key代表主键,比如用户id,或者openid,value是一个map,对应各个字段的属性和值

redis 存储对象的方法对比分析

存放单个字段

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public void hset(string key, string field, string obj) {
redistemplate.boundhashops(key).put(field,obj);
}

存放整个:

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public void hsetmap(string key,map<object,object> map){
redistemplate.boundhashops(key).putall(map);
}

优点:存储方方便,节省内存空间,并且可以直接对单个字段修改,而不用获取整个对象,效率高

缺点:获取value后,是个map,不能方便的直接调用(set get)处理,需要手动map.get(filed)或者map.put(field,value)

1.3 如何解决redis hash存储对象的操作方便性问题

其实关于map和pojo的转换问题,网上给出了利用反射做的转换方法,但是加上了转换和反转,这和序列化和反序列化的问题一样了,效率问题,也不敢指直接用,纠结,思考再三,还是先维持代码不动了,以后考虑好了再说,或者广发网友有啥好解决方法,请多多指教哈!

redis存储对象的三种方式

一、 将对象序列化后保存到redis

序列化工具类实现

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public class serializeutil {
    /*
     * 序列化
     * */
    public static byte[] serizlize(object object){
        objectoutputstream oos = null;
        bytearrayoutputstream baos = null;
        try {
            baos = new bytearrayoutputstream();
            oos = new objectoutputstream(baos);
            oos.writeobject(object);
            byte[] bytes = baos.tobytearray();
            return bytes;
        } catch (exception e) {
            e.printstacktrace();
        }finally {
            try {
                if(baos != null){
                    baos.close();
                }
                if (oos != null) {
                    oos.close();
                }
            } catch (exception e2) {
                e2.printstacktrace();
            }
        }
        return null;
    }
    /*
     * 反序列化
     * */
    public static object deserialize(byte[] bytes){
        bytearrayinputstream bais = null;
        objectinputstream ois = null;
        try{
            bais = new bytearrayinputstream(bytes);
            ois = new objectinputstream(bais);
            return ois.readobject();
        }catch(exception e){
            e.printstacktrace();
        }finally {
            try {
 
            } catch (exception e2) {
                e2.printstacktrace();
            }
        }
        return null;
    }
}

获取jedis实例

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public class redisconnection {
    private static string host = "127.0.0.1";
    private static int port = 6379;
    private static int max_active = 1024;
    private static int max_idle = 200;
    private static int max_wait = 10000;
 
    private static jedispool jedispool = null;
 
    /*
     * 初始化redis连接池
     * */
    private static void initpool(){
        try {
            jedispoolconfig config = new jedispoolconfig();
            config.setmaxtotal(max_active);//最大连接数
            config.setmaxidle(max_idle);//最大空闲连接数
            config.setmaxwaitmillis(max_wait);//获取可用连接的最大等待时间
 
            jedispool = new jedispool(config, host, port);
        } catch (exception e) {
            e.printstacktrace();
        }
    }
 
    /*
     * 获取jedis实例
     * */
    public synchronized static jedis getjedis() {
        try {
            if(jedispool == null){
                initpool();
            }
            jedis jedis = jedispool.getresource();
            jedis.auth("redis");//密码
            return jedis;
        } catch (exception e) {
            e.printstacktrace();
            return null;
        }
    }
}

redis操作类

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public class redisops {
    public static void set(string key,string value){
        jedis jedis = redisconnection.getjedis();
        jedis.set(key, value);
        jedis.close();
    }
    public static string get(string key){
        jedis jedis = redisconnection.getjedis();
        string value = jedis.get(key);
        jedis.close();
        return value;
    }
    public static void setobject(string key,object object){
        jedis jedis = redisconnection.getjedis();
        jedis.set(key.getbytes(), serializeutil.serizlize(object));
        jedis.close();
    }
    public static object getobject(string key){
        jedis jedis = redisconnection.getjedis();
        byte[] bytes = jedis.get(key.getbytes());
        jedis.close();
        return serializeutil.deserialize(bytes);
    }
}

user对象

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public class user implements serializable{
    private static final long serialversionuid = -3210884885630038713l;
    private int id;
    private string name;
    public user(){
 
    }
    public user(int id,string name){
        this.id = id;
        this.name = name;
    }
    //setter和getter方法
}

测试

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public class redistest {
 
    @test
    public void teststring(){
        redisops.set("user:1", "sisu");
        string user = redisops.get("user:1");
        assert.assertequals("sisu", user);
    }
 
    @test
    public void testobject(){
        redisops.setobject("user:2",new user(2,"lumia"));
        user user = (user)redisops.getobject("user:2");
        assert.assertequals("lumia", user.getname());
    }
}

二、将对象用fastjson转为json字符串后存储

redis操作类

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public class redisops {
    public static void setjsonstring(string key,object object){
        jedis jedis = redisconnection.getjedis();
        jedis.set(key, json.tojsonstring(object));
        jedis.close();
    }
    public static object getjsonobject(string key,class clazz){
        jedis jedis = redisconnection.getjedis();
        string value = jedis.get(key);
        jedis.close();
        return json.parseobject(value,clazz);
    }
}

测试

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@test
   public void testobject2(){
       redisops.setjsonstring("user:3", new user(3,"xiaoming"));
       user user = (user)redisops.getjsonobject("user:3",user.class);
       assert.assertequals("xiaoming", user.getname());
   }

三、将对象用hash数据类型存储

redis操作类

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public class redisops {
    public static void hset(string key,string value){
        jedis jedis = redisconnection.getjedis();
        jedis.hset(key, value);
        jedis.close();
    }
    public static string hget(string key){
        jedis jedis = redisconnection.getjedis();
        string value = jedis.hget(key);
        jedis.close();
        return value;
    }
}

测试

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@test
   public void testobject3(){
    //存
       redisops.hset("user:3","id","3");
       redisops.hset("user:3","name","xiaoming");
       
       //取
       string id =  redisops..hget("user:3","id");
       string name = redisops.hget("user:3","name");
       assert.assertequals("3", id);
       assert.assertequals("xiaoming", name);       
   }

以上为个人经验,希望能给大家一个参考,也希望大家多多支持服务器之家。

原文链接:https://blog.csdn.net/afsvsv/article/details/78969541

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