Category Archives: Java

[Jersey] disable decode the URL path

Posted on 2017 年 06 月 01 日 by cowman.chiang

use annotation “@Encoded” Ex: @Path(“{first}/get”) public Response getYouWant(@Context HttpHeaders httpHeaders, @PathParam(“first”) String first, @QueryParam(“second”) @Encoded String second);

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open external program from java for mac os x

Posted on 2017 年 03 月 24 日 by cowman.chiang

String[] cmds = {“open”, tempFile.getAbsolutePath(), “-a”, “/Applications/Microsoft Office 2011/Microsoft Excel.app”}; Runtime.getRuntime().exec(cmds);

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Gson usage : formJson

Posted on 2017 年 02 月 17 日 by cowman.chiang

avoid to face the exception ‘java.lang.ClassCastException With com.google.gson.internal.LinkedTreeMap cannot be cast to…’, we use the TypeToken to convert json to List public class Object { @SerializedName(“n”) private String name; @SerializedName(“i”) private String id; public String getName() { return name; } … Continue reading →

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[Java] unicode to string

Posted on 2016 年 10 月 21 日 by cowman.chiang

public static void main(String[] args) { try { String abc = “0043006F0077006D0061002E002E002E90808ACB”; System.out.print(getString(abc)); } catch (Exception e) { System.out.println(“err”); } } public static String getString(String strValue) { StringBuilder str = new StringBuilder(); String temp; for (int i = 0; i … Continue reading →

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[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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