Redis实战之征服 Redis + Jedis + Spring （二）
不得不说，用哈希操作来存对象，有点自讨苦吃！
不过，既然吃了苦，也做个记录，也许以后API升级后，能好用些呢？！
或许，是我的理解不对，没有真正的理解哈希表。
相关链接：
一、预期
接上一篇，扩充User属性：
Java代码
- public class User implements Serializable {
- private static final long serialVersionUID = -1267719235225203410L;
- private String uid;
- private String address;
- private String mobile;
- private String postCode;
- }
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
Java代码
- @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;
- }
- });
- }
@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：
Java代码
- BoundHashOperations<Serializable, byte[], byte[]> boundHashOperations = redisTemplate.boundHashOps(key);
- boundHashOperations.put(redisTemplate.getStringSerializer().serialize("mobile"), redisTemplate.getStringSerializer().serialize(user.getMobile()));
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：
Java代码
- connection.hMSet(key, boundHashOperations.entries());
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。
Java代码
- @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;
- }
- });
- }
@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。
Java代码
- List<byte[]> value = connection.hMGet(key,redisTemplate.getStringSerializer().serialize("address"),
- redisTemplate.getStringSerializer().serialize("mobile"),
- redisTemplate.getStringSerializer().serialize("postCode"));
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！
Java代码
- 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 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！
相关链接：
