redis缓存工具类，提供序列化接口

Posted 2020-10-21 wiseroll

1、序列化工具类

 1 package com.qicheshetuan.backend.util;
 2 
 3 import java.io.ByteArrayInputStream;
 4 import java.io.ByteArrayOutputStream;
 5 import java.io.ObjectInputStream;
 6 import java.io.ObjectOutputStream;
 7 
 8 public class SerializeUtil {
 9 
10     //序列化
11     public static byte[] serialize(Object object) {
12         ObjectOutputStream oos = null;
13         ByteArrayOutputStream baos = null;
14         try {
15 
16             baos = new ByteArrayOutputStream();
17             oos = new ObjectOutputStream(baos);
18             oos.writeObject(object);
19             byte[] bytes = baos.toByteArray();
20             return bytes;
21         } catch (Exception e) {
22         }
23         return null;
24     }
25     //反序列化
26     public static Object unserialize(byte[] bytes) {
27         ByteArrayInputStream bais = null;
28         try {
29 
30             bais = new ByteArrayInputStream(bytes);
31             ObjectInputStream ois = new ObjectInputStream(bais);
32             return ois.readObject();
33         } catch (Exception e) {
34         }
35         return null;
36     }
37 }

SerializeUtil

2、redis工具类

  1 @Component
  2 public class RedisClientUtil {
  3     @Autowired
  4     private JedisPool jedisPool;
  5     
  6     /**
  7      * 获取Jedis实例
  8      *
  9      * @return
 10      */
 11     public Jedis getJedis() {
 12         return jedisPool.getResource();
 13     }
 14     
 15     /**
 16      * 判断某个key是否存在
 17      *
 18      * @param key
 19      * @return
 20      */
 21     public boolean exist(String key) {
 22         Jedis jedis = null;
 23         try {
 24             jedis = getJedis();
 25             return jedis.exists(key);
 26         } catch (Exception e) {
 27             e.printStackTrace();
 28         } finally {
 29             // 返还到连接池
 30             returnResource(jedis);
 31         }
 32         return false;
 33     }
 34 
 35     /**
 36      * 以key删除某个数据
 37      *
 38      * @param key
 39      * @return
 40      */
 41     public Long del(String key) {
 42         Jedis jedis = null;
 43         try {
 44             jedis = getJedis();
 45             return jedis.del(key);
 46         } catch (Exception e) {
 47             e.printStackTrace();
 48             return null;
 49         } finally {
 50             // 返还到连接池
 51             returnResource(jedis);
 52         }
 53     }
 54   /**
 55      * 将jedis返还到连接池
 56      *
 57      * @param jedis
 58      */
 59     public void returnResource(Jedis jedis) {
 60         if (jedis != null) {
 61             jedisPool.returnResource(jedis);
 62         }
 63     }
 64 
 65     /**
 66      * 存放数据
 67      *
 68      * @param key     存储的key
 69      * @param value   需要存储的数据
 70      * @param express key失效时间
 71      * @return
 72      */
 73     public <T> boolean setObject(String key, T value, int express) {
 74         Jedis jedis = null;
 75         try {
 76             jedis = getJedis();
 77             byte[] bytes = SerializeUtil.serialize(value);
 78             jedis.set(key.getBytes(), bytes);
 79             jedis.expire(key, express);
 80             return true;
 81         } catch (Exception e) {
 82             e.printStackTrace();
 83         } finally {
 84             //返还到连接池
 85             returnResource(jedis);
 86         }
 87         return false;
 88     }
 89 
 90     /**
 91      * 删除key集合
 92      */
 93     public <T> boolean delKeys(List<String> keys) {
 94         Jedis jedis = null;
 95         try {
 96             jedis = getJedis();
 97             for (String key : keys) {
 98                 jedis.del(key.getBytes());
 99             }
100             return true;
101         } catch (Exception e) {
102             e.printStackTrace();
103         } finally {
104             //返还到连接池
105             returnResource(jedis);
106         }
107         return false;
108     }
109 
110     /**
111      * 获取数据
112      *
113      * @param key 存储的key
114      * @return
115      */
116     public <T> T getObject(String key) {
117         Object value = null;
118         Jedis jedis = null;
119         try {
120             jedis = getJedis();
121             byte[] bytes = jedis.get(key.getBytes());
122             value = SerializeUtil.unserialize(bytes);
123         } catch (Exception e) {
124             e.printStackTrace();
125         } finally {
126             // 返还到连接池
127             returnResource(jedis);
128         }
129         if (value != null) {
130             return (T) value;
131         }
132         return null;
133     }
134 
135     /**
136      * 将key的时间置为0，即清除缓存
137      *
138      * @param key 将key的时间置为0，即清除缓存
139      */
140     public void expire(String key) {
141         Jedis jedis = null;
142         try {
143             jedis = getJedis();
144             jedis.expire(key, 0);
145         } catch (Exception e) {
146             e.printStackTrace();
147         } finally {
148             // 返还到连接池
149             returnResource(jedis);
150         }
151     }
152 
153     /**
154      * 删除以某字符串为前缀的key集合
155      */
156     public <T> boolean delKeysMatch(String keyMatch) {
157         Jedis jedis = null;
158         try {
159             jedis = getJedis();
160             Set<String> keys = jedis.keys(keyMatch + "*");
161             Iterator<String> it = keys.iterator();
162             while (it.hasNext()) {
163                 String keyStr = it.next();
164                 jedis.del(keyStr);
165             }
166             return true;
167         } catch (Exception e) {
168             e.printStackTrace();
169         } finally {
170             //返还到连接池
171             returnResource(jedis);
172         }
173         return false;
174     }
175 }

RedisClientUtil