Category Archives: 程式語言

[Java] Append string with adaptive font size to image

Posted on 2021 年 05 月 04 日 by cowman.chiang

Ref: https://blog.csdn.net/zengrenyuan/article/details/80281738 public static ByteArrayOutputStream encodeWithWaterMark(String content) { if (FRONT_IMAGE == null) { return encode(content); } ByteArrayOutputStream os = null; try { BitMatrix matrix = new QRCodeWriter().encode(content, BarcodeFormat.QR_CODE, WIDTH, HEIGHT); BufferedImage backImage = QRCodeUtils.toBufferedImage(matrix); int fontSize = 20; String stringContent … Continue reading →

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[HBase] security issue

Posted on 2019 年 03 月 18 日 by cowman.chiang

error message: com.a.b.c.exception.BaseDAOException: org.apache.hadoop.hbase.security.AccessDeniedException: org.apache.hadoop.hbase.security.AccessDeniedException: Insufficient permissions for user ‘Cowman’ (table=ABC, action=READ) in jvm conf. add “-DHADOOP_USER_NAME=webuser”

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[HBase] convert long value to bytes

Posted on 2018 年 11 月 13 日 by cowman.chiang

Java code: public static void main(String[] args) { String stringValue = Bytes.toStringBinary(Bytes.toBytes(1532080782183l)); System.out.println(stringValue); Long longValue = Bytes.toLong(Bytes.toBytesBinary(stringValue)); System.out.println(longValue); } HBase shell command: hbase(main):056:0> Bytes.toStringBinary(Bytes.to_bytes(1532080782183)) => “\\x00\\x00\\x01d\\xB7!{g” hbase(main):057:0> Bytes.toLong(“\x00\x00\x01d\xB7!{g”.to_java_bytes) => 1532080782183

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[Python] fix error while loading shared libraries: libpython2.7.so.1.0

Posted on 2018 年 07 月 19 日 by cowman.chiang

error log: /opt/rh/python27/root/usr/bin/python: error while loading shared libraries: libpython2.7.so.1.0: cannot open shared object file: No such file or directory check libpython2.7.so.1.0 exist? find . -name ‘libpython2.7.so.1.0’ if the file was exist: edit the ldconfig config echo “/opt/rh/python27/root/usr/lib64” > /etc/ld.so.conf.d/python27.conf ldconfig … Continue reading →

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[Shelll Script] check tomcat status

Posted on 2018 年 07 月 04 日 by cowman.chiang

!/bin/bash tomcat7=$(ps -ef | grep tomcat | wc -l) echo ${#tomcat7} if [ ${#tomcat7} -gt 0 ]; then printf “tomcat is running\n” else printf “tomcat is not running\n” fi

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[JavaScript] cannot call methods on [Object] prior to initialization; attempted to call method ‘refresh’

Posted on 2018 年 05 月 29 日 by cowman.chiang

try to force initialize the object first. stackOverflow: selectmenu (‘refresh’, true)

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[Windows Bash Script] convert csv to html table

Posted on 2017 年 10 月 18 日 by cowman.chiang

source: How to find and replace a string in text file using batch file just replace “,” with html table tag. @echo off setlocal enabledelayedexpansion set txtfile=%~1 set newfile=Output.html if exist “%newfile%” del /f /q “%newfile%” echo ^<table border=’1’^> >> … Continue reading →

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[Java] Convert Hex to String

Posted on 2017 年 08 月 14 日 by cowman.chiang

<code> public static byte[] hexStringToByteArray(String s) { int len = s.length(); byte[] data = new byte[len / 2]; for (int i = 0; i &lt; len; i += 2) { data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) &lt;&lt; 4) + … Continue reading →

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[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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