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JSP custom tags example with body

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 install To use it as a dependency in other Maven projects:

<dependency>
 
 	    <groupId>tag-demo</groupId>
 ...

Using tag handler, UI component and renderer with a JSF facelet taglib

Created by Fang on November 22, 2011 10:40:16 Last update: November 22, 2011 10:40:16

This is an example that uses tag handler, UI component and renderer together to support a custom taglib. The main purpose is to show how these components play together. The tag renders

<ui:param name="extra" value="el interpreted"/>
 
...

<h3>my:foreach</h3>
 
 <ul class="css class" extra...

These are the files: The tag handler ( src/main/java/com/example/ForeachTagHandler.java ):

package com.example;
 
 
 
 import java.util.Map;
...

The UI component ( src/main/java/com/example/UIForeach.java ):

package com.example;
 
 
 
 import java.io.IOExcep...

The renderer ( src/main/java/com/example/ForeachRenderer.java ):

package com.example;
 
 
 
 import java.io.IOExcep...

Faces config ( src/main/resources/META-INF/faces-config.xml ):

<?xml version="1.0" encoding="UTF-8"?>
 
 <faces-c...

Taglib config ( src/main/resources/META-INF/foreach.taglib.xml ):

<?xml version="1.0" encoding="UTF-8"?>
 
 <facelet...

JSF facelet taglib backed by a UI component

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 john steve mike 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:...

Dump binary Android xml files as plain text

Created by freyo on May 13, 2011 15:45:29 Last update: September 20, 2011 08:08:12

This is an Android app that dumps any binarized xml file as plain text - to the sdcard on the device or emulator. build.xml :

<?xml version="1.0" encoding="UTF-8"?>
 
 <project...

AndroidManifest.xml


 
 <?xml version="1.0" encoding="utf-8"?>
 
 <man...

res/layout/main.xml


 
 <?xml version="1.0" encoding="utf-8"?>
 
 <Lin...

res/values/strings.xml :


 
 <?xml version="1.0" encoding="utf-8"?>
 
 <res...

src/com/android/xmltool/DumpXml.java

package com.android.xmltool;
 
 
 
 import java.ut...

Screenshot Pre-built APK can be downloaded from: http://code.google.com/p/android-binxml-dump/

Java dynamic proxy example code: SAX XML handler

Created by alfa on June 03, 2011 09:41:03 Last update: June 03, 2011 09:41:03

Dynamic proxy can be used to eliminate the need to stub out unused interface methods. This is an example for a simple SAX content handler for XML parsing. The org.xml.sax.ContentHandler interface requires 11 methods be implemented but we only need three:

import java.io.IOException;
 
 import java.util.Ar...

With a dynamic proxy, we don't need the empty blocks for the unused methods:

import java.io.IOException;
 
 import java.util.Ar...

Equivalently (with anonymous inner class):

import java.io.IOException;
 
 import java.util.Ar...

demo.xml :

<breakfast-menu>
 
     <food>
 
 	<name>Belgian W...

Android content provider example

Created by freyo on May 17, 2011 11:13:17 Last update: May 17, 2011 11:13:17

This is an odd-ball content provider in that it doesn't provide database records, but provides a resource as a stream. It can be used to provide media files or XML resources. Start the project with: tools/android create project --package com.android... Create assets directory and add an XML file ( assets/demo.xml ): <? xml version="1.0" encoding="UTF-8"?> <people... Edit the layout ( res/layout/main.xml ): <?xml version="1.0" encoding="utf-8"?> <LinearL... Edit src/com/android/cptest/Dummy.java : package com.android.cptest; import java.io.... Add content provider ( src/com/android/cptest/XmlResource.java ): package com.android.cptest; import java.io.... Update AndroidManifest.xml : <?xml version="1.0" encoding="utf-8"?> <manifes... Add this section to the end of build.xml : <target name="-package-resources"> <ech... Build and install: ant install Screenshot: Remove the Dummy activity ( AndroidManifest.xml ): <?xml version="1.0" encoding="utf-8"?> <manifes... Create a new project for...

Android xml resource example

Created by freyo on April 18, 2011 15:08:21 Last update: April 18, 2011 15:12:20

Generate android project $ ~/android-sdk-linux_86/tools/android create proj... Create XML file res/xml/books.xml :

<?xml version="1.0"?>
 
 <catalog>
 
    <book id=...

Edit layout ( res/layout/main.xml ):


 
 <?xml version="1.0" encoding="utf-8"?>
 
 <Lin...

Edit code ( src/com/android/xmlres/XMLResource.java ):

package com.android.xmlres;
 
 
 
 import java.io....

Change activity label from app_name to booklist ( AndroidManifest.xml ):

<?xml version="1.0" encoding="utf-8"?>
 
 <manifes...

Add value for string resource ( res/values/string.xml ):

<?xml version="1.0" encoding="utf-8"?>
 
 <resourc...

Deploy and test: ant install

XmlPullParser example code

Created by freyo on April 18, 2011 14:14:29 Last update: April 18, 2011 14:15:48

For XML resources, Android returns an XmlPullParser reference. I tried the RSSReader example from xmlpull.org , it failed both on the Android emulator and with xpp3-1.1.4c . This is an example for XmlPullParser usage. Since the XmlPullParser is event based, a callback mechanism works better. Java code:

import java.io.*;
 
 import java.net.*;
 
 import ...

The XML file used:

<?xml version="1.0" encoding="UTF-8"?>
 
 <catalog...

Android write to file (internal storage)

Created by freyo on April 15, 2011 09:00:54 Last update: April 15, 2011 09:00:54

Sample code for writing to a file in the internal storage. There are three steps: Open the file with Context.openFileOutput , which returns java.io.FileOutputStream . Write to the file. Close the file.

import java.io.*;
 
 import android.content.Contex...

The second parameter to openFileOutput is the operating mode. Available values are: Context.MODE_PRIVATE Context.MODE_APPEND Context.MODE_WORLD_READABLE Context.MODE_WORLD_WRITEABLE The file is saved in /data/data/<package_name>/files .

Java parse xml with transformer

Created by nogeek on April 07, 2011 21:07:55 Last update: April 07, 2011 21:07:55

You can use the javax.xml.transform.Transformer class to "transform" an XML stream (string in this case) to a DOM tree - effectively parsing the XML string.

import java.io.*;
 
 import javax.xml.transform.Tr...

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