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 ...

Parsing a CVS file seemed to be a sore spot for software development. It's not simple enough that you can roll your own code in a couple of hours, and yet not deemed big enough for a full-fledged project. As a result, there are multiple libraries, each one with its own quirks. This is a summary of some simple tests I've done with five CSV parsers. Apache commons CSV parser : Does not escape backslash. The backslash is treated as literal if not proceeding a double quote, but then there's no way to have a backslash as the last character before the ending quote (even though it's a rare scenario). IOException thrown for unmatched quotes SuperCSV parser Can't handle escapes inside quotes Throws Exception for...

Demo code for CSV parsing with OpenCSV . Java code: import java.io.*; import au.com.bytecode.opencs... Test with a simple CSV file: psmith01,CLASS2B,Peter Smith 1,YEAR2,1,N,ADVANCED,... The parser worked correctly: Line 1 has 11 values: |psmith01| |CLASS2B|... Test with a more complicated CSV file: "psmith01 abc", "CLASS2B " , " Peter... Result: Line 1 has 4 values: |psmith01 abc| |CLASS... The parser: Escaped quote and backslash correctly Ignored spaces before the quotation mark - sometimes (see below) Counted spaces after the right quotation mark till the comma as content, including the right quotation mark (bug). Ignored improperly quoted item - silently (third line) Indeed, the OpenCSV parser has a problem with spaces: Input: "Smith, Jack", "210-345-8888" "Smith, J... Result: Line 1 has 2 values: | Smith, Jack| |210-3......

Demo code for CSV parsing with Skife CSV . Java code: import java.io.*; import java.util.*; import... Test with a simple CSV file: psmith01,CLASS2B,Peter Smith 1,YEAR2,1,N,ADVANCED,... The parser worked correctly: Line 1 has 11 values: |psmith01| |CLASS2B|... Test with a more complicated CSV file: "psmith01 abc", "CLASS2B " , " Peter... Result: Line 1 has 4 values: |psmith01 abc| | CLAS... The parser worked correctly. But notice that it counts the spaces outside of the quotes significant, and doing so consistently. One more test for spaces: "Smith, Jack" , "210-345-8888" "Smith, Jack"... Result: Line 1 has 2 values: | Smith, Jack | | 210... Add a new line in item two: "One", "Two ", "Three" Result: Line 1 has 2 values: |One| | Two| L...

Demo code for CSV parsing with Apache Commons CSV parser . Java code: import java.io.*; import org.apache.commons.csv... Test with a simple CSV file: psmith01,CLASS2B,Peter Smith 1,YEAR2,1,N,ADVANCED,... Result: Line 1 has 11 values: |psmith01| |CLASS2B|... The parser worked correctly. Test with a more complicated CSV file: "psmith01 abc", "CLASS2B " , " Peter... Result: Line 1 has 4 values: |psmith01 abc| |CLASS... The third line is invalid input, but throwing a Java IOException is a bit grave. Also, the parser is not able to escape a backslash. Add a new line in item two: "One", "Two ", "Three" Result: Line 2 has 3 values: |One| |Two | |...

Demo code for CSV parsing with SuperCSV parser . Java code: import java.io.*; import java.util.List; imp... Test with a simple CSV file: psmith01,CLASS2B,Peter Smith 1,YEAR2,1,N,ADVANCED,... The parser worked correctly: Line 1 has 11 values: |psmith01| |CLASS2B|... Test with a more complicated CSV file: "psmith01 abc", "CLASS2B " , " Peter... The parser messed up on all three lines: Line 1 has 5 values: |psmith01 abc| |CLASS... Using two lines input: "psmith01 abc", "CLASS2B " , " Peter... It generates an exception: Line 1 has 5 values: |psmith01 abc| |CLASS... Add a new line in item two: "One", "Two ", "Three" Result: Line 2 has 3 values: |One| |Two | |...

Demo code for CSV parsing with OstermillerUtils . Java code: import java.io.*; import java.util.List; imp... Test with a simple CSV file: psmith01,CLASS2B,Peter Smith 1,YEAR2,1,N,ADVANCED,... The parser worked correctly: Line 1 has 11 values: |psmith01| |CLASS2B|... Test with a more complicated CSV file: "psmith01 abc", "CLASS2B " , " Peter... The parser messed up on all three lines: Line 1 has 6 values: |psmith01 abc| | "CLA... Putting a space before the first quote: "Smith, Jack","210-345-8888" It dismissed the quotes: Line 1 has 3 values: | "Smith| | Jack"| ... Add a new line in item two: "One", "Two ", "Three" Result: Line 1 has 2 values: |One| | "Two| ...

When transforming XML into HTML with XSLT, &nbsp; doesn't seem to work, but &#160; does the trick. Frequently used entities: Name Character Entity Reference Numeric Reference quot " &quot; $#34; amp & &amp; $#38; apos ' &apos; $#39; lt < &lt; $#60; gt > &gt; $#62; nbsp non-breaking space &nbsp; $#160; copy © &copy; $#169; reg ® &reg; $#174; The full list is available here: http://en.wikipedia.org/wiki/List_of_XML_and_HTML_character_entity_references

Perl does not have built-in functions to get the base name or dir name from a file path. But on the Unix platforms we can rely on the executables basename and dirname . #!/usr/bin/perl $f = '/A path with/space "/file... The quotes, escapes, and chomp are necessary: # This fails when there's a space in $f $base =...

This example shows how a service implementation can be loaded with a URLClassLoader . The files. HelloService.java : public interface HelloService { public void... HelloServiceImpl.java : public class HelloServiceImpl implements HelloServ... ServiceFactory.java uses URLClassLoader to load the service implementation: import java.io.*; import java.net.*; pub... Test.java : import java.io.*; import java.net.*; pub... Create a runnable client jar: C:\>jar -cfe client.jar Test Test.class ServiceFac... Create a service jar: jar -cf service.jar HelloServiceImpl.class Test: C:\>java -jar client.jar Class Loader: java.net... Extra Note: : JDK7 added a method URLClassLoader.close() , so that a URLClassLoader can be discarded, and a new one created to load a new implementation.