參考文檔：

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

hscan是針對hash類型掃描，如果hash內條目非常多時，比如超過10萬，那么根據默認的count = 10，每次掃描返回空的概率很大，此時可以根據情況把count調大：

下邊是對jedis的?hscan進行了封裝：

@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;}

?實際使用：

@Testpublic 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("+++++++++++++++++耗時："+(end-start));try {System.out.println("+++++++++++++++++耗時："+(end-start)+" 結果："+JSONUtils.serializeObject(lst));} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}

?

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