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Once your globally declared path variable has been constructed, it can be referenced from tasks using its id attribute. To use the path above when compiling a Java class via the javac task, you would refer to it as follows:
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<javac srcdir="${src.dir}" classpathref="project.class.path" />
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If you have done any Java development from the command line using the JDK, you will no doubt appreciate the power and flexibility of dynamically constructed paths, and specifically the capabilities of the <fileset> element.
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Creating a build file
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C.2.2
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A Sample build file
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When you download the code examples for this book, you will notice that every chapter has its own Ant build file in its base directory. Those files are very similar to the one in listing C.1. Let s examine the contents of this build file to see how Ant works.
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Listing C.1 Build file contents
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< xml version="1.0" encoding="UTF-8" > <project name="Sample" default="run" basedir="."> <property <property <property <property <property
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Root element Sets the global project properties
name="project.name" value="Ant Tutorial"/> name="ant.home" value="C:/ant"/> name="build.dir" value="${basedir}/build"/> name="src.dir" value="${basedir}/src"/> name="lib.dir" value="${base.dir}/lib"/>
<!-To permanently add this task to your Ant configuration, edit the defaults.properties file in ant.jar:/org/apache/tools/ant/taskdefs. You can then remove this declaration from the build file and execute the mytask task as if it were built into Ant. Document file with XML comments --> <!-<taskdef name="mytask" classname="MessagePrinterTask"/> Custom task definition -->
Adds build directory to <path id="project.class.path"> CLASSPATH <pathelement path="${build.dir}"/> <fileset dir="lib"> Adds Zip and JAR files <include name="**/*.jar"/> from the lib directory <include name="**/*.zip"/> to the CLASSPATH </fileset> </path>
<target name="init"> definitions <echo>Running "init" target..."</echo> <tstamp/> <available property="build.dir.exists" file="${build.dir}"/> </target> <target name="prepare.build.dir" unless="build.dir.exists" depends="init">
Builds a
CLASSPATH
variable
Start of target Ant task calls This property only gets set if the build directory exists This executes only if the unless property is not set
APPENDIX C
The Ant build tool
<echo>Running "prepare.build.dir" target..."</echo> <echo>Creating ${build.dir}.</echo> <mkdir dir="${build.dir}"/> </target>
Compiles target
<target name="compile" depends="init, prepare.build.dir"> <echo>Running "compile" target..."</echo> <javac srcdir="${src.dir}" destdir="${build.dir}" classpathref="project.class.path" debug="on" /> <echo>Built ${project.name}...</echo> </target> CLASSPATH
reference
<target name="run" depends="compile"> <echo>Running "run" target..."</echo> <java classname="MessagePrinter" classpathref="project.class.path" fork="yes"> <sysproperty key="message" value="Hello, world!"/> <arg value="message.txt"/> This target invokes the JVM </java> on the class MessagePrinter </target> <target name="build.task" depends="compile"> <echo>Running "build.task" target..."</echo> <jar jarfile="${ant.home}/lib/myTask.jar" basedir="${build.dir}" excludes="**/MessagePrinter.class, **/BuildResultPrinter.class" /> </target> <target name="run.task" depends="compile"> <echo>Running "run.task" target..."</echo> <mytask message="Hello from my task!" file="messageFromTask.txt"/> </target>
Custom task call
<target name="build.listener" depends="compile"> <echo>Running "build.listener" target..."</echo> <jar jarfile="${ant.home}/lib/myListener.jar" basedir="${build.dir}" excludes="**/MessagePrinter*.class" /> </target> </project>
Creating a build file
This root element of the build file defines the project name and base directory from which all other paths in the file will be built. The default=run attribute specifies that the target named run within the project will be invoked by default if no other target is specified on the command line. This is a task definition for the custom task we build later, in section C.3. As we will see, there are two ways to make your custom task classes available within an Ant project. These are the project target definitions. The depends attribute lists other targets that should be evaluated before this one, allowing you to build a dependency tree among targets. For example, if you invoke Ant to run the compile task,
prompt> ant compile
targets will be evaluated in the following order:
1 2 3
init prepare.build.dir
compile
e f g
This target compiles all Java files in the source directory and places the compiled classes into the build directory by calling the javac task. Note that it depends on two tasks, which are evaluated in the order in which they appear. This is a call to the javac task, passing a reference to our dynamically constructed CLASSPATH. This is a call to a custom task we develop ourselves in section C.3.
To use this build file, it should be saved as a file called build.xml in your working directory. Ant looks for a file by this name in the current directory by default. You also need to create directories named lib and src beneath your working directory. Notice that Ant will create the directory called build automatically if it does not exist the first time you compile your project. Let us put Ant to work with this build file. Copy or download the source code from listing C.2 into a file named MessagePrinter.java in your src subdirectory. This class requires a system property named message to be set. It also accepts a command-line argument. We pass both of these to the JVM via the java task call in our build file:
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