Category Archives: 程式語言

[Java, HBase] Hostname is very important!

Posted on 2015 年 12 月 01 日 by cowman.chiang

If the connection is failed, try to check the hdfs uri setting, it might be used hostname.

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[Java] Connect LDAP (subdomain).

Posted on 2015 年 11 月 18 日 by cowman.chiang

Ref. referrals & global catalog, AD Child Domain Referral Searches by Rajnish Bhatia If you want to search all subdomain, the port of ‘PROVIDER_URL’ might be use in 3268.

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[Java] Check apache poi version

Posted on 2015 年 11 月 17 日 by cowman.chiang

Ref: The Apache POI project – Frequently Asked Questions: My code uses some new feature, compiles fine but fails when live with a “MethodNotFoundException” or “IncompatibleClassChangeError” ClassLoader classloader = org.apache.poi.poifs.filesystem.POIFSFileSystem.class.getClassLoader(); URL res = classloader.getResource(“org/apache/poi/poifs/filesystem/POIFSFileSystem.class”); String path = res.getPath(); System.out.println(“Core POI … Continue reading →

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[Java] Write xls files

Posted on 2015 年 11 月 02 日 by cowman.chiang

public String createFile(Object object) { try { Excel excel = (Excel) object; HSSFWorkbook hssfWorkbook = new HSSFWorkbook(); for (SheetContent sheetContent:excel.getSheets()) { HSSFSheet sheet = hssfWorkbook.createSheet(sheetContent.getName()); List<HSSFCellStyle> formats = new ArrayList<>(); /** format */ for (String format:sheetContent.getFormats()) { HSSFCellStyle cs = … Continue reading →

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[Java] Binary numbers in enum type.

Posted on 2015 年 10 月 12 日 by cowman.chiang

public enum Type { /** none */ NONE(0), /** ONE */ ONE(1), /** TWO */ TWO(2), /** FOUR */ FOUR(4), /** EIGHT */ EIGHT(8), /** SIXTEEN */ SIXTEEN(16); private int key; private static int[] binaryArray = { 0, 1, 2, … Continue reading →

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[Java] String.format

Posted on 2015 年 10 月 02 日 by cowman.chiang

private String GroupMessageAuto = “已完成自動同步動作，共計新增 %s 筆、刪除 %s 筆、同步 %s 筆”; groupMsg = String.format(GroupMessageAuto, syncCount.getAdd(), syncCount.getDel(), syncCount.getSync());

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[Java、HBase] Retrieving timestamp form HBase row

Posted on 2015 年 08 月 11 日 by cowman.chiang

Ref. stackoverflow: retrieving timestamp from hbase row HTableInterface hTableInterface = CONNECTION.getTable(Table.SCHEMA_NAME); Result result = hTableInterface.get(get); Date date = new Date(result.raw()[0].getTimestamp()); System.out.println(“DateTime: ” + sdf.format(date)); we must edit HBaseSettings to set hbaseConf.set(HBASE_ENV_KEY_ZOOKEEPER_QUORUM, “target_zookeeper_address”);

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[Java] Transform currentTimeMillis to readable date format

Posted on 2015 年 08 月 11 日 by cowman.chiang

Ref. stackoverflow: how-to-transform-currenttimemillis-to-a-readable-date-format SimpleDateFormat sdf = new SimpleDateFormat(“MMM dd,yyyy HH:mm”); Date date = new Date(System.currentTimeMillis()); System.out.println(“DateTime: ” + sdf.format(date));

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[Java] Check UUID format

Posted on 2015 年 08 月 11 日 by cowman.chiang

Ref. BUKKIT: Best way to check if a String is a UUID private static boolean checkUUIDFromat(String uuid) { if (uuid.matches(“[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}”)) { return true; } return false; }

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[Java] Check string is a messy code?

Posted on 2015 年 07 月 09 日 by cowman.chiang

Ref: Java判断字符串是否是乱码（亲测可用） public static boolean isChinese(char c) { Character.UnicodeBlock ub = Character.UnicodeBlock.of(c); if (ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS || ub == Character.UnicodeBlock.CJK_COMPATIBILITY_IDEOGRAPHS || ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_A || ub == Character.UnicodeBlock.GENERAL_PUNCTUATION || ub == Character.UnicodeBlock.CJK_SYMBOLS_AND_PUNCTUATION || ub == Character.UnicodeBlock.HALFWIDTH_AND_FULLWIDTH_FORMS) { return true; } … Continue reading →

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