redis序列化對象操作
阿新 • • 發佈:2018-04-30
com sql iss stat nts 字符 project esc sage
在項目開發過程中,一些經常用到但又基本不變的對象信息我們可以把它緩存起來,這樣可以減少我們操作msql等數據庫的時間
緩存對象信息最常用的有兩種,一種是將對象信息轉成json形式的字符串緩存起來,另一種將對象系列化緩存起來
redis緩存byte數據時無論是在時間開銷還是內存開銷上都比緩存string數據有優勢,所以相較於第一種,第二種緩存方式更憂一點
下面以緩存用戶信息user為例進行操作
user對象信息:
package com.study.model; public class User { private Integer id; private String name;private Integer age; public User() { super(); } public User(Integer id, String name, Integer age) { super(); this.id = id; this.name = name; this.age = age; } public Integer getId() { return id; } public void setId(Integer id) {this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public Integer getAge() { return age; } public void setAge(Integer age) { this.age = age; } @Override publicString toString() { return "User {id:" + id + ", name:" + name + ", age:" + age + "}"; } }
對user進行系列化存儲代碼:
package com.study.util; import com.dyuproject.protostuff.LinkedBuffer; import com.dyuproject.protostuff.ProtostuffIOUtil; import com.dyuproject.protostuff.runtime.RuntimeSchema; import com.study.model.User; import redis.clients.jedis.Jedis; public class RedisSerializable { private static RuntimeSchema<User> schema = RuntimeSchema.createFrom(User.class); public static void main(String[] args) { User user = new User(1,"張三",18); int timeout = 5*60; //將user對象存入redis String result = putUser(user,timeout); System.out.println("返回結果:" + result); User user1 = getUser(1); System.out.println(user1.toString()); } public static String putUser(User user,int timeout) { String result = ""; try { Jedis jedis = RedisUtil.getJedis(); try { String key = "user:" + user.getId(); byte[] bytes = ProtostuffIOUtil.toByteArray(user, schema, LinkedBuffer.allocate(LinkedBuffer.DEFAULT_BUFFER_SIZE)); result = jedis.setex(key.getBytes(), timeout, bytes); return result; }finally { jedis.close(); } }catch(Exception e) { e.printStackTrace(); } return result; } public static User getUser(int id) { try { Jedis jedis = RedisUtil.getJedis(); try { String key = "user:"+id; byte[] bytes = jedis.get(key.getBytes()); if(bytes != null && bytes.length>0) { User user = schema.newMessage(); ProtostuffIOUtil.mergeFrom(bytes, user, schema); return user; } }finally { jedis.close(); } }catch(Exception e) { e.printStackTrace(); } return null; } }
代碼git地址:https://gitee.com/sjcq/redis.git
redis序列化對象操作