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Created by Fang on July 26, 2010 19:18:28
Last update: August 18, 2010 19:13:02
The tags <c:import> The <c:import> tag imports the contents of a URL and expose that in one of three ways: Import contents from a URL and write it out to the page (url may be relative or absolute):
<c:import url="theUrl" /> Import contents from a URL and save it to a scoped variable string named by the var attribute. Use the scope attribute to define the scope of the exported variable. <c:import url="theUrl" var="importTest" scope="ses... Import a URL and expose to a Reader object named by the varReader attribute. The scope attribute does not apply. The varReader scoped variable can only be accessed within the body of <c:import> . <c:import url="theUrl" varReader="theReader"/> <c:url> The <c:url> tag constructs a URL and writes it out to the...
Created by Dr. Xi on August 03, 2010 16:29:35
Last update: August 03, 2010 16:36:50
This utility converts unicode escape strings in a file to UTF-8 encoded. Suppose you received a properties file with contents like:
# @(#)codepoint_zh_CN.properties 1.4 05/09/27
#...
You can use this utility to convert it to UTF-8 and view or edit.
import java.io.*;
/**
* Reads file with...
This utility is equivalent to:
native2ascii -reverse -encoding utf-8
using the standard Java native2ascii utility.
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 Dr. Xi on July 29, 2010 18:46:57
Last update: July 29, 2010 18:48:15
This is an example of using java.beans.XMLEncoder and java.beans.XMLDecoder to serialize/deserialize Java objects to XML. Java code TestXMLEncoder.java:
import java.io.*; import java.beans.XMLEncoder;... SimpleBean.java: public class SimpleBean { private String na... CompositeBean.java: public class CompositeBean { private Simple... NotABean.java: public class NotABean { private String name... Test Output By default, only Java beans can be serialized using XMLEncoder . Exception occurs when you try to deserialize an object which is not a Java bean. Errors actually occur when you try to serialize, but they are ignored. As a result, an XML file is generated by the serialization but the file is useless! Console output: C:\>java TestXMLEncoder Testing simple bean ... simplebean.xml: <?xml version="1.0" encoding="UTF-8"?> <java v... compositebean.xml: <?xml version="1.0" encoding="UTF-8"?> <java v... nodefault.xml: <?xml version="1.0" encoding="UTF-8"?> <java v......
Created by Dr. Xi on July 19, 2010 21:58:34
Last update: July 23, 2010 21:37:23
Parsing XML in Java is really simple:
import java.io.*; import javax.xml.parsers.Docu... The parser implementation details are hidden behind the JAXP API. In case you want to know which parser implementation is used, this is what the JavaDoc for DocumentBuilderFactory.newInstance says: Use the javax.xml.parsers.DocumentBuilderFactory system property. Use the properties file " lib/jaxp.properties " in the JRE directory. This configuration file is in standard java.util.Properties format and contains the fully qualified name of the implementation class with the key being the system property defined above. The jaxp.properties file is read only once by the JAXP implementation and it's values are then cached for future use. If the file does not exist when the first attempt is made to read from it, no further attempts are made to...
Created by James on July 06, 2010 19:35:00
Last update: July 06, 2010 19:35:00
Java has built-in functions to get the basename and dirname for a given file path, but the function names are not so self-apparent.
import java.io.File;
public class JavaFileD...
Results:
C:\tmp>java JavaFileDirNameBaseName
Dirname: .....
Created by James on June 30, 2010 20:14:28
Last update: July 03, 2010 18:41:12
The HTML page
<!DOCTYPE html>
<html>
<head>
<title>jQu...
Client Side Code
// called before upload submit
function sta...
Server Side Code
Using Apache Commons FileUpload as example.
Upload code (responds to fileUpload.do ):
final HttpSession session = httpServletRequest...
Progress code (responds to uploadProgress.do ):
HttpSession session = httpServletRequest.getSe...
Created by magnum on June 23, 2010 22:24:01
Last update: June 23, 2010 22:24:01
Required:
Apache web server
mod_proxy_html
proxy_html.conf:
# Load mod_proxy_html required SOs
LoadFile /us...
httod.conf
# load proxy_html conf
Include conf/extra/proxy...
Created by magnum on June 23, 2010 19:02:32
Last update: June 23, 2010 19:05:08
Get the public keys. The Apache HTTPD developer keys are available from: http://www.apache.org/dist/httpd/KEYS . Save the key file as KEYS .
Import the keys into your keyring. The GPG ring is stored at $HOME/.gnupg/pubring.gpg .
gpg --import KEYS
Verify the signature. Using mod_proxy_html as example:
C:\Downloads>gpg mod_proxy_html.zip.asc
gpg: Si...
Created by Dr. Xi on June 20, 2010 14:35:17
Last update: June 20, 2010 14:35:17
This XML signature validator comes from the Apache XML Security project. It validates the signature according to the core validation processing rules .
It does not verify that the key used to generate the signature is a trusted key. You can override the KeySelector class to make sure that the signing key is from a trusted store.
import javax.xml.crypto.*;
import javax.xml.cry...
