征服 Redis + Jedis + Spring （二）—— 哈希表操作（HMGET HMSET）

一、预期

接上一篇，扩充User属性：

 

 public class User implements Serializable {
     private static final long serialVersionUID = -1267719235225203410L;

     private String uid;

     private String address;

     private String mobile;

     private String postCode;
 }

 我期望的是： 

 

 

redis 127.0.0.1:6379> hmget uc.user.info.uid.u123456 address mobile postCode
1) "\xe4\xb8\x8a\xe6\xb5\xb7"
2) "13800138000"
3) "100859"

 

 

几乎就是一个对象了！ 

但是，接下来的代码实现，让我彻底崩溃了！

 

二、代码实现

1.保存——HMSET

 

 @Override
 public void save(final User user) {
     redisTemplate.execute(new RedisCallback<Object>() {
         @Override
         public Object doInRedis(RedisConnection connection)
                 throws DataAccessException {
             byte[] key = redisTemplate.getStringSerializer().serialize(
                     "uc.user.info.uid." + user.getUid());
             BoundHashOperations<Serializable, byte[], byte[]> boundHashOperations = redisTemplate
                     .boundHashOps(key);
             boundHashOperations.put(redisTemplate.getStringSerializer()
                     .serialize("mobile"), redisTemplate
                     .getStringSerializer().serialize(user.getMobile()));
             boundHashOperations.put(redisTemplate.getStringSerializer()
                     .serialize("address"), redisTemplate
                     .getStringSerializer().serialize(user.getAddress()));
             boundHashOperations.put(redisTemplate.getStringSerializer()
                     .serialize("postCode"), redisTemplate
                     .getStringSerializer().serialize(user.getPostCode()));
             connection.hMSet(key, boundHashOperations.entries());
             return null;
         }
     });
 }

 

 

这里用到：

 

 BoundHashOperations<Serializable, byte[], byte[]> boundHashOperations = redisTemplate.boundHashOps(key);
 boundHashOperations.put(redisTemplate.getStringSerializer().serialize("mobile"), redisTemplate.getStringSerializer().serialize(user.getMobile()));

 看着就有点肿。。。Map封装完以后，用HMSET命令：

 

 connection.hMSet(key, boundHashOperations.entries());

 这时候就完成了哈希表的保存操作，可以在控制台看到相应的数据了。

 

redis 127.0.0.1:6379> hmget uc.user.info.uid.u123456 address mobile postCode
1) "\xe4\xb8\x8a\xe6\xb5\xb7"
2) "13800138000"
3) "100859"

 

2.获取——HMGET

这一刻，我彻底崩溃了！取出来的值是个List，还得根据取得顺序，逐个反序列化，得到内容。

 

 @Override
 public User read(final String uid) {
     return redisTemplate.execute(new RedisCallback<User>() {
         @Override
         public User doInRedis(RedisConnection connection)
                 throws DataAccessException {
             byte[] key = redisTemplate.getStringSerializer().serialize(
                     "uc.user.info.uid." + uid);
             if (connection.exists(key)) {
                 List<byte[]> value = connection.hMGet(
                         key,
                         redisTemplate.getStringSerializer().serialize(
                                 "address"),
                         redisTemplate.getStringSerializer().serialize(
                                 "mobile"), redisTemplate
                                 .getStringSerializer()
                                 .serialize("postCode"));
                 User user = new User();
                 String address = redisTemplate.getStringSerializer()
                         .deserialize(value.get(0));
                 user.setAddress(address);
                 String mobile = redisTemplate.getStringSerializer()
                         .deserialize(value.get(1));
                 user.setMobile(mobile);
                 String postCode = redisTemplate.getStringSerializer()
                         .deserialize(value.get(2));
                 user.setPostCode(postCode);
                 user.setUid(uid);

                 return user;
             }
             return null;
         }
     });
 }

 这个实现，跟Redis的命令几乎一模一样，指定Key，指定field，获取其值。

 

 List<byte[]> value = connection.hMGet(key,redisTemplate.getStringSerializer().serialize("address"),
 redisTemplate.getStringSerializer().serialize("mobile"),
 redisTemplate.getStringSerializer().serialize("postCode"));

 我绝对相信，要么是我用的过于肤浅，低估了Spring的封装能力。或者，我该直接Json！等等，这不是MongoDB干的事情吗？！

PS：这两篇博客里操作的数据类型，只能是String类型，还没搞定除此以外任何类型。吾将上下而求索～～～

上述操作也许你吐了，接下来的代码，就再吐一次吧！

封装对象的时候，一定要记得次序。。。。这绝对不是一个优质代码的实现风格！

 

 User user = new User();
 String address = redisTemplate.getStringSerializer().deserialize(value.get(0));
 user.setAddress(address);
 String mobile = redisTemplate.getStringSerializer().deserialize(value.get(1));
 user.setMobile(mobile);
 String postCode = redisTemplate.getStringSerializer().deserialize(value.get(2));
 user.setPostCode(postCode);

 好吧！苦逼的事情，就此结束。目标Json支持！