话不多说直接干代码:
keys * 这个命令别在生产环境乱用。特别是数据庞大的情况下。因为Keys会引发Redis锁,并且增加Redis的CPU占用。很多公司的运维都是禁止了这个命令的, 后续的操作 会导致连接耗尽报错。
基于 scan 进行操作
/**
* 通过scan 获取redis key 避免阻塞
* @param redisTemplate redisTemplate
* @param redisPattern 需要匹配的key
* @param size 每次指定扫描的key的数量
*/
public Set<Object> redisScanFormatValue(RedisTemplate<String,Object> redisTemplate,String redisPattern,long size){
return redisTemplate.execute((RedisCallback<Set<Object>>) redisConnection->{
Set<Object> keySet = new HashSet<>();
try (Cursor<byte[]> scan = redisConnection.scan(new ScanOptions.ScanOptionsBuilder().match(redisPattern).count(size).build())){
while (scan.hasNext()){
byte[] bytes = redisConnection.get(scan.next());
Object deserialize = redisTemplate.getValueSerializer().deserialize(bytes);
keySet.add(deserialize);
}
}catch ( Exception e){
e.printStackTrace();
}
return keySet;
});
}
/**
* 通过scan 获取redis key 避免阻塞
* @param redisTemplate redisTemplate
* @param redisPattern 需要匹配的key
* @param size 每次指定扫描的key的数量
*/
public Set<String> redisScanFormatKey(RedisTemplate<String,Object> redisTemplate,String redisPattern,long size) {
return redisTemplate.execute((RedisCallback<Set<String>>)connect->{
Set<String> keySet = new HashSet<>();
try (Cursor<byte[]> cursor = connect.scan(ScanOptions.scanOptions().match(redisPattern).count(size).build())){
while (cursor.hasNext()){
byte[] next = cursor.next();
Object deserialize = redisTemplate.getKeySerializer().deserialize(next);
keySet.add(String.valueOf(deserialize));
}
}catch (Exception e){
e.printStackTrace();
}
return keySet;
});
}