Transcript A Beginners Guide to Java Integration in Coldfusion

Rick Root
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It just doesn’t seem right to have a slide with
bullet points that prompt me to talk about
myself.
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Extend ColdFusion with “core” java
Extend ColdFusion with external java libraries
We will not talk about JVM tuning, writing CFX
Custom Tags in Java, or writing your own Java
classes.
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ColdFusion newbs
Never really used Java in ColdFusion
Just here for the networking
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Java Objects
Data Types
Creating and Initializing Java Objects
JavaCast()
Examples
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It all starts with java.langObject
Java objects have methods, so ColdFusion
variables do to.
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Example 1
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Strictly typed, very picky!
Don’t assume!
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Example 2
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In Java, create and initialize all at once, ie:
foo = new ClassName(arguments)
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In CF, use CreateObject() and init() method
foo = CreateObject(“java”,”path.to.ClassName”);
foo.init(arguments);
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Multiple constructors / overloaded methods
foo.init(“string”);
foo.init(someint);
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Force a ColdFusion variable to be a specific
data type
Example 3 & 4
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Object creation is expensive
Strings are immutable
Java StringBuffer object can help!
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Example 5
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Where to Install
Java Loader
Examples
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Standalone:
<cfroot>/lib
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Multi-server Install, all instances:
<jrunroot>/servers/lib
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Multi-server install, specific Instance:
<jrunroot>/servers/<instancename>
/cfusion.ear/cfusion.war
/WEB-INF/cfusion/lib
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Anywhere you want!
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javaloader.cfc – Mark Mandel
Access classes without requiring them to be
in the server CLASSPATH
Javaloader.riaforge.org
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Example 6
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Generating Excel Files
Creating delimited text files
Extracting JPEG image metadata
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Apache POI – API to interface with Microsoft
Office files
http://poi.apache.org
Create Excel files in native format
Use more Excel features
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Example 7
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JavaCSV makes it easy
Choose your delimiter
Automatic quoting when data contains your
delimiter or even newlines
Example 8
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Digital cameras store lots of metadata in
captured images
Timestamp
Exposure
Camera model
Lots of stuff I don’t understand!
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Example 9
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Rick Root
[email protected]
http://www.opensourcecf.com/