redis 存儲(chǔ)對(duì)象的方法對(duì)比分析

更新時(shí)間：2021年07月28日 14:37:12 作者：xiaoxiaoyunlu

這篇文章主要介紹了redis 存儲(chǔ)對(duì)象的方法對(duì)比分析，具有很好的參考價(jià)值，希望對(duì)大家有所幫助。如有錯(cuò)誤或未考慮完全的地方，望不吝賜教

redis 存儲(chǔ)對(duì)象的方法對(duì)比

問(wèn)題背景：

原來(lái)項(xiàng)目里面全部是直接redis存儲(chǔ)對(duì)象的json數(shù)據(jù)，需要頻繁的序列化和反序列化，后來(lái)考慮更換項(xiàng)目中的redis存儲(chǔ)對(duì)象為hash對(duì)象存儲(chǔ)的，但是獲取后不能方便的set get操作，很是蛋疼，怎么才能解決這個(gè)問(wèn)題呢？

1.1 直接存儲(chǔ)對(duì)象的json

存放redis的時(shí)候，直接先用fastJson 或者 jackJson或者Gson把對(duì)象序列化為json數(shù)據(jù)，然后用直接存放，key表示用戶id或許和openid,value則是對(duì)象的json數(shù)據(jù)

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);
}

優(yōu)點(diǎn)：雖然需要序列化和反序列化，但是可以直接操作對(duì)象的方法，方便快捷

缺點(diǎn)：需要序列化和反序列化，并且修改單個(gè)字段，需要獲取整個(gè)json,修改后，序列化保存，浪費(fèi)空間，浪費(fèi)時(shí)間，效率低

1.2 采用redis hash key field value 存儲(chǔ)

key代表主鍵，比如用戶id，或者openId，value是一個(gè)map,對(duì)應(yīng)各個(gè)字段的屬性和值

存放單個(gè)字段

public void hset(String key, String field, String obj) {
redisTemplate.boundHashOps(key).put(field,obj);
}

存放整個(gè)：

public void hSetMap(String key,Map<Object,Object> map){
redisTemplate.boundHashOps(key).putAll(map);
}

優(yōu)點(diǎn)：存儲(chǔ)方方便，節(jié)省內(nèi)存空間，并且可以直接對(duì)單個(gè)字段修改，而不用獲取整個(gè)對(duì)象，效率高

缺點(diǎn)：獲取value后，是個(gè)map，不能方便的直接調(diào)用(set get)處理，需要手動(dòng)map.get(filed)或者map.put(field,value)

1.3 如何解決redis hash存儲(chǔ)對(duì)象的操作方便性問(wèn)題

其實(shí)關(guān)于map和pojo的轉(zhuǎn)換問(wèn)題，網(wǎng)上給出了利用反射做的轉(zhuǎn)換方法，但是加上了轉(zhuǎn)換和反轉(zhuǎn)，這和序列化和反序列化的問(wèn)題一樣了，效率問(wèn)題，也不敢指直接用，糾結(jié)，思考再三，還是先維持代碼不動(dòng)了，以后考慮好了再說(shuō)，或者廣發(fā)網(wǎng)友有啥好解決方法，請(qǐng)多多指教哈！

Redis存儲(chǔ)對(duì)象的三種方式

一、將對(duì)象序列化后保存到Redis

序列化工具類實(shí)現(xiàn)

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;
    }
}

獲取jedis實(shí)例

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連接池
     * */
    private static void initPool(){
        try {
            JedisPoolConfig config = new JedisPoolConfig();
            config.setMaxTotal(MAX_ACTIVE);//最大連接數(shù)
            config.setMaxIdle(MAX_IDLE);//最大空閑連接數(shù)
            config.setMaxWaitMillis(MAX_WAIT);//獲取可用連接的最大等待時(shí)間
 
            jedisPool = new JedisPool(config, HOST, PORT);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
 
    /*
     * 獲取jedis實(shí)例
     * */
    public synchronized static Jedis getJedis() {
        try {
            if(jedisPool == null){
                initPool();
            }
            Jedis jedis = jedisPool.getResource();
            jedis.auth("redis");//密碼
            return jedis;
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }
}

redis操作類

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對(duì)象

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
}

測(cè)試

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、將對(duì)象用FastJSON轉(zhuǎn)為JSON字符串后存儲(chǔ)

redis操作類

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);
    }
}

測(cè)試

 @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、將對(duì)象用Hash數(shù)據(jù)類型存儲(chǔ)

redis操作類

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;
    }
}

測(cè)試

 @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);        
    }

以上為個(gè)人經(jīng)驗(yàn)，希望能給大家一個(gè)參考，也希望大家多多支持腳本之家。

您可能感興趣的文章: