将对象序列化存到redis缓存中

来源：互联网发布：张予曦的淘宝店铺编辑：程序博客网时间：2024/06/05 09:26

当前spring框架提供了完整的redis缓存的注解支持，只要在方法前面加上注解@Cacheable
直接去访问这个方法就会自动获取缓存。但是
会存在一种这样的需求就是你不想去访问这方法
就可以当前缓存中数据。这个时候你可以自
己写方法去获取当前缓存key值的对应缓存的
数据。一下是我写的手动去获取我存在缓存中的
hashMap和删除hashMap中的数据，其中
hashmap被封装在类中，该类需要实现序列化接口，
再将该类序列化保存到缓存中。

package com.bisa.hkshop.zj.component;import java.io.Serializable;import java.util.HashMap;import java.util.Map;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.dao.DataAccessException;import org.springframework.data.redis.connection.RedisConnection;import org.springframework.data.redis.core.RedisCallback;import org.springframework.data.redis.core.RedisTemplate;import org.springframework.stereotype.Component;import com.bisa.health.appserver.utils.CacheUtity;import com.bisa.hkshop.zj.basic.utility.BaseDelayed;import com.bisa.hkshop.zj.basic.utility.DelayOrderDto;@Componentpublic class OrderRedisImp implements IOrderRedis{    @Autowired    private RedisTemplate redisTemp;    //获取所有redis中所有的order    @Override    public HashMap<String,BaseDelayed<String>> getOrderRedis() {//对象换成你自己        DelayOrderDto order;        if(redisTemp.hasKey("order")){                    order = (DelayOrderDto) redisTemp.execute(new RedisCallback<Object>() {                    public Object doInRedis(RedisConnection connection) throws DataAccessException {                        String sms_key = "order";                        byte[] value = connection.get(sms_key.getBytes());                        if(value.length>0){                            return CacheUtity.toObject(value);                        }else{                            return "";                        }                    }                });          return  order.getDelaylist();        }        return null;    }    //添加到缓存    public void addOrderRedis(BaseDelayed<String> delayed) { //对象是你自己的        /**         * 将order存到redis缓存         */        //对象换成你自己        HashMap<String,BaseDelayed<String>> delayList = this.getOrderRedis();        if(delayList==null){            delayList = new HashMap<String,BaseDelayed<String>>();        }        delayList.put(delayed.getValue(), delayed);        DelayOrderDto order = new DelayOrderDto();        order.setDelaylist(delayList); //存到封装好的map中        redisTemp.execute(new RedisCallback<Boolean>() {            public Boolean doInRedis(RedisConnection connection) throws DataAccessException {                String sms_key = "order";                connection.setEx(sms_key.getBytes(), 3600, CacheUtity.toByteArray(order));                return true;            }        });    }        //删除缓存中某个order    public void delOrderRedis(BaseDelayed<String> delayed) {        /*         * 将delay从redis中的删除         */        HashMap<String,BaseDelayed<String>> delayList = this.getOrderRedis();        delayList.remove(delayed.getValue());        DelayOrderDto order = new DelayOrderDto();        order.setDelaylist(delayList); //存到封装好的HashMap中        redisTemp.execute(new RedisCallback<Boolean>() {            public Boolean doInRedis(RedisConnection connection) throws DataAccessException {                String sms_key = "order";                connection.setEx(sms_key.getBytes(), 3600, CacheUtity.toByteArray(order));                return true;            }        });    }}

下面是关于序列化的两个方法：

package com.bisa.health.appserver.utils;import java.io.ByteArrayInputStream;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.ObjectInputStream;import java.io.ObjectOutputStream;public class CacheUtity {    //将对象序列化    static public byte[] toByteArray(Object obj) {        byte[] bytes = null;        ByteArrayOutputStream bos = new ByteArrayOutputStream();        try {            ObjectOutputStream oos = new ObjectOutputStream(bos);            oos.writeObject(obj);            oos.flush();            bytes = bos.toByteArray();            oos.close();            bos.close();        } catch (IOException ex) {            ex.printStackTrace();        }        return bytes;    }//反序列化    static public  Object toObject(byte[] bytes) {        Object obj = null;        try {            ByteArrayInputStream bis = new ByteArrayInputStream(bytes);            ObjectInputStream ois = new ObjectInputStream(bis);            obj = ois.readObject();            ois.close();            bis.close();        } catch (IOException ex) {            ex.printStackTrace();        } catch (ClassNotFoundException ex) {            ex.printStackTrace();        }        return obj;    }}

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