参考文档：

http://doc.redisfans.com/key/scan.html

hscan是针对hash类型扫描，如果hash内条目非常多时，比如超过10万，那么根据默认的count = 10，每次扫描返回空的概率很大，此时可以根据情况把count调大：

下边是对jedis的hscan进行了封装：

@Overridepublic ScanResults hscanToResltByVague(String key, String pattern, String cursor, int pageSize) {List<Map.Entry<String, String>> result = null;List<Map.Entry<String, String>> results = new ArrayList<Map.Entry<String, String>>();ScanResults rsl = new ScanResults();ScanParams params = new ScanParams();String scanCursor = "0";if (!RobotUtils.isNull(cursor)) {scanCursor = cursor;}params.count(pageSize + 50);do {ScanResult<Entry<String, String>> scanResult = jedis.hscan(key, scanCursor, params.match(pattern));scanCursor = scanResult.getStringCursor();result = scanResult.getResult();results.addAll(result);if (results.size() >= pageSize) {break;}} while (!scanCursor.equals("0"));rsl.setCursor(scanCursor);rsl.setResultsEntry(results);rsl.setResultSize(results.size());return rsl;}

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实际使用：

@Test     public void testRedisHscan() throws InterruptedException {                  Thread.sleep(1000*40);                  long start = System.currentTimeMillis();                  DataCache cache = DataCacheFactory.getInstance();         //ScanResults rs = cache.hscanToResltByVague("METADATA:VDITEMS", "c3ed2101aa56421d9f0eb23e4b719c29*", "0", 50000);         List<HashMap<String, String>> lst = cache.hscanToResltByVague(SysConfig.getProperty("metadata.cache.vdItem"), "c3ed2101aa56421d9f0eb23e4b719c29*", "0", 50000).getResults();                 long end = System.currentTimeMillis();                  System.out.println("+++++++++++++++++耗时："+(end-start));         try {            System.out.println("+++++++++++++++++耗时："+(end-start)+"     结果："+JSONUtils.serializeObject(lst));        } catch (IOException e) {            // TODO Auto-generated catch block             e.printStackTrace();        }     }