Redis:存储对象的几种方式

方式一：序列化操作

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

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

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);
    }
}

实体类

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
}

测试用例

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());
    }

}

方式二：使用fastjson将对象转为json字符串后存储

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:

@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());
    }

方式三：使用Hash数据类型

//存
Jedis jedis = RedisConnection.getJedis();
jedis.hSet("user:3","id","3");
jedis.hSet("user:3","name","xiaoming");
jedis.close();
//取
Jedis jedis = RedisConnection.getJedis();
String id = jedis.hGet("user:3","id");
String name = jedis.hGet("user:3","name");
jedis.close();