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Created by Dr. Xi on November 01, 2013 10:17:57 Last update: November 01, 2013 10:17:57
This example class reads a RSA private key file in PEM format.
import java.io.*; import java.security.*; im...
Created by Dr. Xi on October 31, 2013 18:17:09 Last update: October 31, 2013 18:17:09
You have a PGP public in PEM format, which cannot be stored in a Java key store. But you have the PEM encoded public key file. This class reads the file and creates a public key class in Java. Example key file:
-----BEGIN PUBLIC KEY----- MIIBIjANBgkqhkiG9w0B...Java code:
import java.io.*; import java.security.*; im...
Created by Dr. Xi on October 12, 2013 13:06:55 Last update: October 12, 2013 13:06:55
Generate the ssh keys:
$ ssh-keygen -t rsa Generating public/private r...Convert the ssh public key to PEM format:
$ cd .ssh ~/.ssh$ ssh-keygen -f mykey.pub -e -m...
Created by Fang on December 06, 2011 19:03:25 Last update: December 07, 2011 08:54:11
Our custom tag, as implemented in the previous note , is broken when a template is used. Create a template file ( home-template.xhtml ):
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Stric...and a test page that uses it ( home.xhtml ):
<?xml version="1.0" encoding="UTF-8"?> <ui:comp...Then request the page with URL: http://localhost:8080/facelet-demo/home.jsf?name=Jack . You'll find that our hello tag works inside ui:repeat but fails to get the value defined by ui:param ! What's the problem? Our hello tag implementation evaluated the EL with the wrong EL context! This is the corrected implementation:
package com.example; import java.io.IOExcep...
Created by Fang on November 03, 2011 19:47:38 Last update: November 08, 2011 20:24:47
This is a step-by-step example to create a really simple facelet taglib (in JSF 2 with Maven). Create a simple Maven project with:
mvn archetype:create -DgroupId=com.example -Dartif...Three files are created as a result: pom.xml src/main/java/com/example/App.java src/test/java/com/example/AppTest.java This project should be able to build with:
mvn packageAdd facelet API dependencies to pom.xml :
<project xmlns="http://maven.apache.org/POM/4....The compiler plugin section is optional. Remove src/main/java/com/example/App.java , create a new Java class as the facelet Tag Handler ( HelloTagHandler.java ):
package com.example; import java.io.IOExcep...This tag handler simply prints a "Hello" message. Create facelet tag declaration file src/main/resources/META-INF/hello.taglib.xml :
<?xml version="1.0" encoding="UTF-8"?> <facelet...Build the JAR with
mvn clean packageOptionally, install it to the local repository:
mvn installTo use the taglib, simply drop the...
Created by freyo on May 13, 2011 15:45:29 Last update: September 20, 2011 08:08:12
This is an Android app that dumps any binarized xml file as plain text - to the sdcard on the device or emulator. build.xml :
<?xml version="1.0" encoding="UTF-8"?> <project...AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?> <man...res/layout/main.xml
<?xml version="1.0" encoding="utf-8"?> <Lin...res/values/strings.xml :
<?xml version="1.0" encoding="utf-8"?> <res...src/com/android/xmltool/DumpXml.java
package com.android.xmltool; import java.ut...Screenshot Pre-built APK can be downloaded from: http://code.google.com/p/android-binxml-dump/
Created by freyo on May 24, 2011 09:15:14 Last update: May 24, 2011 09:15:14
Java built-in X.509 certificate factory reads CertPath objects encoded in PkiPath or PKCS7 formats. The META-INF/<key_alias>.RSA file generated by Java jarsigner is in PKCS7 format. Example code:
import java.util.*; import java.io.*; import...PKCS7 files can also be generated by openssl from certificate file(s):
openssl crl2pkcs7 -nocrl -certfile Certs.pem -out ...Convert PKCS7 from DER to PEM:
openssl pkcs7 -in certs.pk7 -inform DER -out certs...Sample PKCS7 file:
-----BEGIN PKCS7----- MIIERwYJKoZIhvcNAQcCoIIEO...
Created by freyo on April 07, 2011 15:29:01 Last update: April 07, 2011 15:29:01
Format Name Description PKCS #7 Cryptographic Message Syntax Standard A PKCS #7 file can be used to store certificates, which is a SignedData structure without data (just the certificates). The file name extension is usually .p7b , .p7c PKCS #8 Private-Key Information Syntax Standard. Used to carry private certificate keypairs (encrypted or unencrypted). PKCS #12 Personal Information Exchange Syntax Standard. Defines a file format commonly used to store private keys with accompanying public key certificates, protected with a password-based symmetric key. It is the successor to PFX from Microsoft. DER Distinguished Encoding Rules A binary format for keys or certificates. It is a message transfer syntax specified by the ITU in X.690. PEM Privacy Enhanced Mail Base64 encoded DER certificates or keys, with additional header...
Created by alfa on April 06, 2011 12:48:44 Last update: April 06, 2011 12:48:44
package com.demo.io; import java.io.*; ...
Created by Dr. Xi on January 14, 2010 00:28:27 Last update: March 30, 2011 15:37:44
A task that a Java developer does so frequently is to find out where a certain class can be found - to resolve compilation errors, classpath issues, or version conflicts of the same class introduced by multiple class loaders. A long while back I wrote a simple Perl script to perform the task. Later I was informed that there are Swing based Jar Browser and Jars Browser . Then, there are a couple of shell one-liners:
# one liner 1 find -name "*.jar" -print0 | xarg...But all of them share the same problem: if a class is in a jar nested in another jar, it cannot be found. Such is the case for a class inside a jar under the WEB-INF/lib directory of a...