Recent Notes
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Created by Dr. Xi on April 05, 2011 08:04:37
Last update: April 05, 2011 08:11:37
There's no difference between a Java HTTP client and a Java HTTPS client. Ignore JavaWorld Java Tip 96 , it's way too old. The following code gets an HTTP page as well as an HTTPS page.
import java.io.*;
import java.net.*;
pub...
There's one catch . If you are using the code on a test server with a self-signed certificate, it fails. In that case, I would suggest that you download the certificate from the server and import it to your keystore as a trusted key. You may also need to add a subject alternative name to the certificate if the host name does not match the certificate.
You may also choose to use a custom TrustManager and HostnameVerifier to ignore the certificate verification errors.
Created by Dr. Xi on March 28, 2011 20:51:30
Last update: March 28, 2011 20:53:46
HTTP basic authentication is just Base64 encoded user name and password passed in as the Authorization header. So the following code works:
// encode user name and password
String credent...
However, since JDK 1.2, there's a more Java friendly way:
Authenticator.setDefault(new Authenticator() {
...
Test code:
import java.net.*;
import java.io.*;
pub...
Created by Dr. Xi on October 16, 2008 20:45:40
Last update: March 28, 2011 20:23:22
Java's built-in classes are way too complex/flexible for a simple protocol like HTTP. This is a wrapper to simplify HTTP GET and POST.
import java.io.*;
import java.net.*;
imp...
A simple test:
import java.io.*;
import java.util.*;
...
Created by James on July 19, 2009 20:51:23
Last update: January 11, 2011 20:14:18
If CSS3 border-image is properly supported, making a rounded corner box is very easy. You just need a round corner image like this: The following markup:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" ... would render like this (try it in Firefox 3.5 and Google Chrome): However, IE as of version 8.0 does not support border-image . So until border-image is reliably supported in all major browsers, we still have to rely on tried and true tricks to make it work. In general, I found three general categories of tricks to make rounded corners: Good old tables. This trick creates a table of 9 cells and uses the 8 cells on the perimeter to render the borders and rounded corners. The central cell is used for...
Created by James on September 20, 2010 22:30:46
Last update: September 20, 2010 22:30:46
<html>
<head>
<style type="text/css">
...
Created by nogeek on August 08, 2010 23:38:04
Last update: August 08, 2010 23:38:04
Especially, the ethernet0.virtualDev = "e1000" line should be absent in order for networking to work.
#!/usr/bin/vmplayer
# Filename: Win2000.vmx...
Created by voodoo on July 11, 2009 15:14:55
Last update: July 29, 2010 22:45:48
cURL is a command line tool for transferring files with URL syntax. The main purpose and use for cURL is to automate unattended file transfers or sequences of operations.
It's really easy to see HTTP headers with curl:
C:\>curl --head http://www.google.com
HTTP/1.0 ...
or, headers and page together (dump headers to stdout):
$ curl --dump-header - http://www.google.com HTTP/...
Download openssl from openssl.org:
curl http://www.openssl.org/source/openssl-0.9.6m....
C:\>curl --help
Usage: curl [options...] <url>
...
Created by Fang on April 01, 2010 22:24:58
Last update: April 02, 2010 02:49:38
In this note I'll show you how to create and package a JSP custom tag. The purpose of this tag is to display a random splash image for a home page, among a set of images. We should be able to add or delete candidate splash images from the WAR archive without the need to change the JSP. This is the intended use of the tag:
<%@ taglib uri="http://custom.tag.com/demo" prefix... In the above example you provide a set of images named splash*.png (e.g., splash1.png, spalsh2.png, ...), and the tag will pick a random one to display when the JSP is rendered. Let's get started. I'll use Maven for this purpose. Create the standard Maven directory structure ./pom.xml ./src ./src/main ./src/main/jav... pom.xml <project xmlns="http://maven.apache.org/POM/4.0.0"... SplashTag.java package tagdemo; import java.util.ArrayList......
Created by Dr. Xi on November 19, 2008 00:22:27
Last update: January 07, 2010 23:00:36
There is a open source project named [ini4j] for processing Windows .ini configuration files. However, I found it an overkill for my purposes. So here is my simple implementation of a .ini parser. It mimics the standard java.util.Properties class with enhancements to get and set properties by section name. There are only a few simple rules: Leading and trailing spaces are trimmed from section names, property names and property values. Section names are enclosed between [ and ] . Properties following a section header belong to that section Properties defined before the appearance of any section headers are considered global properties and should be set and get with no section names. You can use either equal sign ( = ) or colon ( : )...
Created by Dr. Xi on January 04, 2010 05:04:10
Last update: January 07, 2010 15:59:25
This is the error:
>>> import urllib2
>>> f = urllib2.urlopen('htt...
Reason: SSL is not supported in Python installation.
>>> import httplib
>>> hasattr(httplib, 'HTTPS'...
Solution: recompile Python with SSL on
Steps:
Download and install OpenSSL , if you don't have it already.
Download Python source and rebuild Python (the usual steps of configure, make and make install). Python's configure script should be able to pick up your existing SSL libraries automatically and build a shared library _ssl.so.
Some web sites suggest editing the file Modules/setup.dist , uncomment the lines starting with _ssl , and making changes to the SSL path. This would link the SSL library statically to Python.
# Socket module helper for socket(2)
#_socket s...
