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Java Tools Tutorials - Herong's Tutorial Notes
This free book is an excellent tutorial book for beginners. It is a collection of notes and sample codes written by the author while he was learning Java tools himself. Topics include java, javac, jar, jdb, jar, javap, keytool, jconsole, jps, jstatd, jstat, jinfo, jmap, jhat, jstack.
2016-01-12, 5278👍, 1💬

💬 2016-01-12 ASHIS BEHERA: IT IS VERY GOOD

Perl Tutorials - Herong's Tutorial Examples
This Perl tutorial book is a collection of notes and sample codes written by the author while he was learning Perl language himself. Topics include ActivePerl, data types, subroutines, debug, references, objects, open, binary, file, directory, DBM, MySQL, regular expression, RPC::XML, XML::Simple, S...
2017-10-06, 5254👍, 5💬

💬 2017-10-23 guru: That's an issue with the Perl script, not with running the script itself, and it deserves another question (not here, on Stack O...

💬 2017-10-06 drhvr: mysql I added root as user and password.in singlequotes. It works great

💬 2014-03-17 Steven Klotz: Hi Herong, I found this web site while looking for PERL examples. Your knowledge and the amount of work you done (docu, tutorial...

💬 2010-11-22 Herong: Kim, Yes, you can prompt the user for a path name, open directory with opendir(), loop through each files, use the -s operator t...

💬 2010-11-19 Kim: Thank you Herong. I am a beginner and teaching myself how to use PERL. I found your tutorials very interesting. I am building a ...

Downloading and Installing Java DB (Derby)
This section describes how to download and install Java DB (Derby database server) 10.11 - free for evaluation.
2018-05-10, 5253👍, 10💬

💬 2018-05-10 Anonomyus: tanks

💬 2016-02-19 Ali: Good App

💬 2016-02-02 kotyba: very nice

💬 2016-02-02 kotyba: thanks

💬 2015-10-30 govind: super

(More comments ...)

SQL Server CLOB (Character Large Object) - TEXT
This chapter provides tutorial notes on CLOB (Character Large Object) data types, TEXT, with SQL Server JDBC Driver. Topics include creating tables to store CLOB values in SQL Server server; inserting CLOB values with direct SQL INSERT statements, or PreparedStatement with setString(), setCharacterS...
2016-04-07, 5215👍, 1💬

💬 2016-04-07 kuchbhi: OK. Thank you................................. .................................... .................................... .............

"openssl pkcs8" Converting Keys to PKCS#8 Format
This section provides a tutorial example on how to convert a private key file from the traditional format into PKCS#8 format using the 'openssl pkcs8' command. Keys can still be encoded with DER or PEM with or without DES encryption in PKCS#8 format.
2016-04-12, 5176👍, 1💬

💬 2016-04-12 Nishant Desai: Does anyone knows any library by which i can execute openssl pkcs8 -topk8 -in openssl_key.pem -inform pem -out openssl_key_pk8_e...

Base32 Encoding Algorithm
This section describes the Base32 encoding algorithm with some simple encoding examples.
2016-08-31, 5092👍, 3💬

💬 2016-08-31 as: ok as

💬 2016-02-15 juraj: Dobry den Slovesk

Checking FTP Server Log File
This section provides a tutorial example on how to check FTP server log file.
2018-04-28, 5056👍, 3💬

💬 2018-04-28 Herong: Scott, the IIS settings.

💬 2018-04-27 Scott: if you look at setting...... what settings?

💬 2016-09-25 Humphrey Bogart: meaningful comments

Installing NMake 1.5
This section provides a tutorial example on how to install the 'make' utility on Windows, NMake 1.5, to help installing the RPC::XML Perl module.
2018-01-25, 5036👍, 19💬

💬 2017-12-06 sdfgsdf: fdgsfg

💬 2017-11-16 Ye Hongshaui: Very good

💬 2017-11-02 lxddd: thank you very much!

💬 2017-08-18 zhaogt: verry good!

💬 2017-05-20 qws: Very good

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META-INF Files - Digests, Signature and Certificate
This section describes META-INF files in an .apk package file: MANIFEST.MF - manifest file, CERT.SF - signature file and CERT.RSA - the real signature file with certificate.
2015-09-04, 5033👍, 2💬

💬 2015-09-04 Herong: KariK, thanks for sharing your comments.

💬 2015-08-28 KariK: Step 5. CERT.RSA is not the only file type. There can also be CERT.DSA and CERT.EC files.

XSD Validation and Error List
This section provides a tutorial example on how to perform XSD validation and view error list using XML Tools Plugin in Notepad++.
2017-05-27, 4998👍, 7💬

💬 2017-05-27 Herong: No problem. Have a good weekend!

💬 2017-05-27 Greg: Me again - false alarm, the error message I saw was caused by xsi:schemaLocation that was specified in the file. Sorry to troubl...

💬 2017-05-26 Greg: Hi, this was working fine, but now when I click Validate Now, I get an error message: Following error occurred during schema ...

💬 2015-12-23 Herong: Mat2001uk, That is better than the version I was testing. Thanks for sharing this information with us.

💬 2015-12-22 Mat2001uk: In v6.8.6 I see only one error:"XML Parsing error at line 16: StartTag: invalid element name" ...just FYI.

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"bad decrypt:./crypto/evp/evp_enc.c:461" Error
This section provides a tutorial example on why OpenSSL 'pkcs12' failed with 'bad decrypt:./crypto/evp/evp_enc.c :461'error. The root cause is the key password different than file password.
2015-09-10, 4889👍, 1💬

💬 2015-09-10 Action Here: this totally helped me.

DES (Data Encryption Standard) Cipher Algorithm
This section describes DES (Data Encryption Standard) algorithm - A 16-round Feistel cipher with block size of 64 bits.
2015-11-05, 4825👍, 8💬

💬 2015-11-05 Herong: The Anh, good question. If your key is less than 64 bits, you can pad it with 0 or 1. Or use a hash algorithm to produce 64 bits...

💬 2015-11-04 The Anh: what if my key don't have enough bit?

💬 2015-11-04 Herong: Zaeem, take a look at the source code at Simple Cryptographer - Simple DES/AES Implementation in C#

💬 2015-11-03 zaeem: how to implement on windows form in c#

💬 2015-10-03 Herong: Mihir, what type of algorithm are you looking for?

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First 8336 Hex Digits of PI
This section provides first 8336 hex digits of constant PI, 3.1415927..., needed for Blowfish encryption algorithm.
2016-10-31, 4822👍, 8💬

💬 2016-10-31 Andres: cool

💬 2016-04-07 Tamas Losonczi: This is great

💬 2016-03-15 Bogdan: Thanks!

💬 2015-12-03 Herong: Sadi, we only need (18*32+4*256*32)/4=8336 hex digits for the Blowfish encryption algorithm. I have typos in my tutorials. I wil...

💬 2015-12-02 Sadi: Sorry, I meant "8336 and not 8366"... Also would you like to compare these with "http://hexpi.sourceforge.net/" as there are som...

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Removing IE Addon "Skype Browser Helper"
This section provides a tutorial example on how to disable and remove 'Skype Browser Helper' addon from Internet Explorer.
2018-05-07, 4808👍, 6💬

💬 2018-05-07 Daniel Parker: Hi Herongyang.com, How are you doing today? I'm sure you have been contacted regarding this before but our value proposition is ...

💬 2017-07-15 Herong: Thomas, "Skype Browser Helper" add-on is part of the "Skype Click to Call" installed program. So uninstall "Skype Click to Call"...

💬 2017-07-14 Thomas: I also notice that these programs DO NOT APPEAR under Windows Programs and Features. Thus, your suggestion to go there and remov...

💬 2017-07-14 Thomas: Firstly, you mention how to disable the add-on, NOT how to REMOVE IT. Secondly, why are you talking about PDF Link Helper at all...

💬 2015-10-15 Theresa Zabolotny: There is no remove button on this one thanks or I would not be contacting you.

Using openConnection() Method in java.net.URL Class
This section provides a tutorial example on how to use the openConnection() method in the java.net.URL class to perform a GET method on an HTTPS server. Java Secure Socket Extension (JSSE) works quietly behind the java.net.URL class to provide HTTPS support.
2015-08-05, 4806👍, 2💬

💬 2015-08-05 ashkart: doesnt work indeed. Connection type got, connection object got too. But then there is an exception "java.net.ConnectException: C...

💬 2015-08-05 ashkart: sorry, works fine, i forgot i'm behind the proxy...

HttpsClient.java - HTTPS Client Test Program
This section provides a tutorial example on how to write a HTTPS client test program, HttpsClient.java. It sends a simple HTTP request page using the HTTPS protocol.
2015-11-20, 4790👍, 6💬

💬 2015-11-20 Herong: Philip, can you run HttpsHello server with SSL debug turned on? My test programs do have issues with newer build of JDK 1.7 and ...

💬 2015-11-19 Philip: java version "1.7.0_80" Java(TM) SE Runtime Environment (build 1.7.0_80-b15) Java HotSpot(TM) 64-Bit Server VM (build 24.80-b11,...

💬 2015-11-19 Herong: Philip, which JDK version are you using?

💬 2015-11-18 Philip: I changed the code, but then reset back to the example. I recreated the jks a few times. The JVM and OS had not changed. It stop...

💬 2015-11-18 Herong: Philip, Was anything changed? Certificates, code, JVM or operating system...

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Loading JDBC Driver for MySQL Server
This section describes how to load the MySQL JDBC driver class - mysql-connector-java-5.1.36-bi n.jar.
2018-09-20, 4781👍, 4💬

💬 2018-09-20 raj: hatt budbak aisa kuch nahin hota bakwas hai ye program

💬 2017-09-16 vivek sharma: good

💬 2017-01-14 Herong: Thanks for the nice comment! ☺

💬 2017-01-13 jasonts2000: Thank you, this is the best example of how to test a JDBC connection to mysql that I have seen posted

javax.net.debug - Debugging SSL Socket Communication
This section provides a tutorial example on how to use JVM property, javax.net.debug, to turn on the SSL socket communication debug option. The debug output message can help you to know what exactly happens at the SSL layer.
2017-03-02, 4738👍, 2💬

Chinese Character String with UTF-8 Encoding
This section providing information on handling Chinese character string literals in UTF-8 encoding.
2017-01-04, 4720👍, 8💬

💬 2016-03-10 Herong: Developers are welcome! ☺

💬 2016-03-09 as: o i am developer

💬 2016-02-15 test: Hello i am developer

💬 2015-11-07 Herong: 間單 and 间单 are corrected now. Thanks again for your comment. ☺

💬 2015-10-31 Herong: Yeah. I will fix it later. Thanks.

(More comments ...)

A Sample WSDL 2.0 Document
This section describes a sample WSDL 2.0 document, which defines a Web service, helloService, with an operation called Hello.
2016-03-11, 4583👍, 1💬

💬 2015-08-12 Vivek: Hello fighter

Loading JDBC Driver Class - ojdbc16.jar
This section describes how to load the Oracle JDBC driver class - ojdbc14.jar.
2017-03-07, 4580👍, 3💬

💬 2017-03-07 yuguohui: study and work

💬 2016-08-02 Herong: mukesh, Which test code are you running? The test code in this tutorial is just to test how to load the JDBC driver JAR file. Yo...

💬 2016-08-01 mukesh: Do not connect to DB - Error:java.sql.SQLException: Listener refused the connection with the following error: ORA-12505, TNS:lis...

What Is SHA1 Message Digest Algorithm?
This section describes what is SHA1 (Secure Hash Algorithm 1) - a message digest algorithm which takes as input a message of arbitrary length and produces as output a 160-bit 'fingerprint'.
2017-12-09, 4548👍, 6💬

💬 2017-12-09 Herong: See the next tutorial: SHA1 Message Digest Algorithm Overview.

💬 2017-12-04 V: where can we find sha-1 formula ?

💬 2016-01-16 raza: i am raza see you latter

💬 2015-10-10 Herong: Ash, the next tutorial may help you understand better: SHA1 Message Digest Algorithm Overview

💬 2015-10-09 Ash: Please can u explain clearly..I dint understood

(More comments ...)

Table of Contents
This free VBScript tutorial book is a collection of notes and sample codes written by the author while he was learning VBScript himself, an ideal tutorial guide for beginners. Topics include Variant, Array, Function, Error Handling, Regular Expression, Dictionary, File System, Class, Object, IE Brow...
2016-05-23, 4540👍, 1💬

💬 2016-05-23 Herong: James, your email address is not working. Please contact me.

Downloading and Installing JRockit R28.2.7
This section provides a tutorial example on how to download and install Oracle JRockit 6 R28.2.7 on Windows systems.
2018-10-11, 4307👍, 2💬

💬 2018-10-11 cxtr: tanks good

💬 2015-08-11 hgfhfg: gjhg

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