MACROMEDIA COLDFUSION 4.5-CFML LANGUAGE Manuale Utente Scaricare il pdf (Pagina 12)

12 CHAPTER 30 Extending ColdFusion with CFX

To compile your CFX, use javac on the command line to compile the HelloWorld.java ﬁle as

shown below, adjusting the paths to the

cfx.jar and HelloWorld.java ﬁles as appropriate for your

system:

javac -classpath c:\CFusionMX7\lib\cfx.jar HelloWorld.java

The cfx.jar ﬁle contains the com.allaire.cfx package, which deﬁnes the Request and Response

interfaces referred to in the skeletal snippet shown in the previous section (and in Listing 30.1). The

cfx.jar ﬁle is installed automatically to the CFusionMX7/lib folder when you install ColdFusion.

The compiler needs to be able to ﬁnd this ﬁle in order to be able to compile the class; typically,

you provide the location using the

-classpath switch as shown above. Consult the Java SDK

documentation for the

javac utility for details on the -classpath switch.

NOTE

Depending on how your system is configured, you may also need to provide a full path to the javac executable, which is located in

the bin subfolder within the folder to which the Java SDK was installed.

After you compile the tag, a ﬁle named HelloWorld.class will appear in the same folder where the

HelloWorld.java ﬁle is located. Copy this ﬁle to the

WEB-INF/classes folder within ColdFusion’s

program root (typically

c:\CFusionMX7\wwwroot\WEB-INF\classes if you’re using a Windows server).

NOTE

I’m having you place the class file in the WEB-INF/classes folder because that is recommended by Macromedia as a good place

for CFX class files during testing and development. Once you have finished developing the tag, you can place the class on your pro-

duction servers in just about any location. The only caveat is that the class needs to be somewhere within the Class Path specified in

the Java and JVM page of the ColdFusion Administrator.

NOTE

The ColdFusion documentation also refers to the WEB-INF/classes folder as a good place to put your class files during devel-

opment. The documentation suggests that one of these folders (the

WEB-INF/classes folder or the CFusionMX7/lib

folder) is meant to ease development by eliminating the need to restart ColdFusion after a Java CFX has been recompiled.

If you want, you can tell javac to place the class ﬁle directly in the lib folder as it is being compiled.

As an example, I used the command shown below to compile the class (Figure 30.3). Of course, I

typed this all on one line, but it’s too long to print on one line in this book:

c:\jdk1.3.1-01\bin\javac c:\inetpub\wwwroot\ows_adv\30\HelloWorld.java

-classpath c:\CFusionMX7\lib\cfx.jar

-d c:\CfusionMX7\wwwroot\WEB-INF\classes -verbose

This command assumes that the Java SDK was installed to the c:\jdk1.3.1_01 folder, that you are

using the built-in Web server, that the

HelloWorld.java ﬁle is stored with the other listings for this

chapter (within the

ows_adv branch of the Web server document root), and that ColdFusion was

installed to the default c:\CFusionMX7 location. Make whatever path adjustments are necessary for

your system. You can leave off the

-verbose switch if you want; it just causes javac to display some

additional messages while it is compiling the class.

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