Notes by Dr. Xi
Displaying keyword search results 1 - 10
Created by Dr. Xi on June 22, 2011 13:23:19
Last update: April 30, 2012 11:40:06
This is a utility to convert a byte array to hex string, and to convert a hex string back to the original.
To convert a String to hex, you must call String.getBytes() first. The utility does not pretend to know your string encoding.
public class StringHexUtil {
public static ...
This also works:
String binaryToHex(byte[] data) {
StringBui...
Created by Dr. Xi on April 19, 2012 10:10:08
Last update: April 19, 2012 10:11:06
The default servlet for Tomcat is declared in $CATALINA_HOME/conf/web.xml :
<servlet>
<servlet-name>default</servle...
Therefore, static content is rendered by the default configuration unless you override it with your own definitions.
If you want to allow directory listing, just change the listing parameter to true :
<init-param>
<param-name>listings</para...
Change the welcome-file-list to display a default page in lieu of a directory listing:
<welcome-file-list>
<welcome-file>home.xhtml</...
Welcome pages are defined at the Web application level.
Created by Dr. Xi on March 14, 2012 14:23:14
Last update: March 14, 2012 14:23:14
If forgotPasswordForm.error is a String and not null, you cannot test the error condition with:
<!-- This does not work! -->
<c:if test="${forg...
You have to use "not empty":
<c:if test="${not empty forgotPasswordForm.error}"...
Created by Dr. Xi on March 08, 2012 12:13:57
Last update: March 08, 2012 12:13:57
This example creates an instance of XMLGregorianCalendar and converts it to java.util.Date :
import java.util.Date;
import javax.xml.datatyp...
Created by Dr. Xi on May 02, 2011 15:59:37
Last update: February 25, 2012 09:16:37
This code snippet gets the default keystore used by the Java keytool and displays the list of aliases along with the key type (certificate or private key).
import java.io.File;
import java.io.FileInputSt...
The default keystore used by the above code is: $HOME/.keystore .
Created by Dr. Xi on January 06, 2012 14:02:09
Last update: January 06, 2012 14:02:09
In Java, the OS temporary directory is identified by the system property java.io.tmpdir :
public class TmpDir {
public static void ma...
Created by Dr. Xi on November 11, 2011 13:59:46
Last update: November 11, 2011 13:59:46
This is an example to replace a Java string with case insensitive match.
Code:
public class ReplaceTest {
public static vo...
Output:
Done TEST tEst tESt Test
Test TEST tEst tESt Te...
Created by Dr. Xi on November 11, 2011 10:05:22
Last update: November 11, 2011 10:12:01
This is an HTML image tag filter using Java regex. It takes a string, finds the img tags, replaces the src attribute with one provided by the filter, then adds a class name to the class attribute.
import java.util.regex.*;
import java.io.*;
...
Test file:
<div id="HTML snippet">
<img src="img/big/txt-m...
Created by Dr. Xi on October 22, 2011 14:34:17
Last update: October 22, 2011 14:34:33
JDK version and corresponding class version numbers:
JDK Version Class Version
1.0 45.3
1.1 45.3
1.2 46.0
1.3 47.0
1.4 48.0
1.5 49.0
1.6 50.0
Created by Dr. Xi on July 27, 2011 08:55:34
Last update: July 27, 2011 08:55:34
It is OK to remove elements from a list with Iterator , but you get UnsupportedOperationException if the list is created with Arrays.asList :
import java.util.*;
public class IteratorRe...
Prints:
ArrayList test:
================
List size: ...
