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Created by Dr. Xi on November 01, 2013 10:23:45 Last update: November 01, 2013 10:23:45
This example class generates and verifies RSA signature on a test file.
import java.io.*; import java.security.*; im...
Created by Fang on April 16, 2012 13:32:10 Last update: April 16, 2012 13:32:10
There are two steps to create a custom function for JSP: Declare the function in the TLD:
<?xml version="1.0" encoding="UTF-8" ?> <taglib...Implement the function (must be static):
package com.example; public class UrlTransl...To use the function:
<%@ taglib uri="http://www.example.com/jsp/tags" p...
Created by Fang on March 30, 2012 15:04:04 Last update: March 30, 2012 15:04:04
Spring MVC 3.1 can send either JSON or HTML response on the same URL, depending on the type of response requested. With this mechanism, a page can be sent when directly requested from a link, but a JSON response can be sent in response to an AJAX request. This is the controller code:
package com.example; import java.util.Map; ...In the above example, JSON response will be sent when the HTTP request contains header "Accept: application/json". HTML response will be sent then the header is "Accept: */*", or "Accept: text/html", or anything else. You can add a limitation that the HTML response does not produce "application/json". But then the question is which response will be sent when the HTTP header is "Accept: */*"? Both methods will...
Created by Fang on January 28, 2012 13:24:09 Last update: January 28, 2012 13:31:22
This is a simple JSP custom tags library with tag body. Just like the JSF counterpart , it splits a string and repeats the body for each word, i.e., with this markup:
<%@ taglib uri="http://custom.tag.com/demo" prefix...output:
<html> <body> <p>Hello Tigger!</p> <p>H...With Maven, this is the directory structure:
./src ./src/main ./src/main/resources ./s...There are three files to write: pom.xml :
<project xmlns="http://maven.apache.org/POM/4.0.0"...src/main/java/tagdemo/IterateTag.java :
package tagdemo; import java.io.IOException...src/main/resources/META-INF/demotag.tld :
<?xml version="1.0" encoding="UTF-8"?> <!DO...Build with:
mvn clean installTo use it as a dependency in other Maven projects:
<dependency> <groupId>tag-demo</groupId> ...
Created by Fang on January 04, 2012 11:14:46 Last update: January 04, 2012 11:14:46
Assume that your messages are defined in MessageResources.properties , this is how you load and use the messages:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Stric...In MessageResources.properties :
pageTitle = JSF Resource Bundle Example page.he...
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 December 03, 2011 12:31:20 Last update: December 03, 2011 12:33:23
The <h:outputText> tag generates different output for body text and value attribute. I tested the following with Apache MyFaces 2.1.3:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Stric...With value attribute, the output was:
<table border='1' cellspacing='0' cellpadding='4'>...With text in body, the output was (i.e., the text was escaped despite escape="false" ):
<table border='1' cellspacing='0' cellpadding='...
Created by Fang on November 08, 2011 20:55:00 Last update: November 21, 2011 18:19:44
In the simple taglib example , I used a tag handler class to implement a taglib. This is an example to implement a taglib with a UI component. The purpose is to use a custom tag to split a string and print each part in a separate paragraph, i.e., print
<p>john</p> <p>steve</p> <p>mike</p>with custom tag <my:foreach> :
<my:foreach var="who" value="john steve mike"> ...These are the files: pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0"...src/main/java/com/example/UIForeash.java :
package com.example; import java.io.IOExcep...src/main/resources/META-INF/faces-config.xml :
<?xml version="1.0" encoding="UTF-8"?> <faces-c...src/main/resources/META-INF/foreach.taglib.xml :
<?xml version="1.0" encoding="UTF-8"?> <facelet...How to use: Put the JAR file generated by the above project in the WEB-INF/lib folder of the web app. If the web app is a Maven project, just add the taglib project as a dependency:...
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 Fang on November 10, 2011 11:27:37 Last update: November 10, 2011 11:28:25
This has been tested working with Apache MyFaces 2.1.3 running Tomcat 7. Managed bean code:
package com.example; import javax.faces.bea...Facelet page:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Stric...