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488 lines
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488 lines
19 KiB
HTML
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The ASF licenses this file to You under the Apache License, Version 2.0
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<html lang="en">
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<head>
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<title>Tutorial: Hello World with Apache Ant</title>
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<link rel="stylesheet" type="text/css" href="stylesheets/style.css">
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</head>
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<body>
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<h1>Tutorial: Hello World with Apache Ant</h1>
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<p>This document provides a step by step tutorial for starting Java programming with Apache Ant. It
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does <strong>not</strong> contain deeper knowledge about Java or Ant. This tutorial has the goal to let you see, how to
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do the easiest steps in Ant.</p>
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<h2>Content</h2>
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<ul>
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<li><a href="#prepare">Preparing the project</a></li>
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<li><a href="#four-steps">Four steps to a running application</a></li>
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<li><a href="#enhance">Enhance the build file</a></li>
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<li><a href="#ext-libs">Using external libraries</a></li>
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<li><a href="#resources">Resources</a></li>
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</ul>
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<h2 id="prepare">Preparing the project</h2>
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<p>We want to separate the source from the generated files, so our Java source files will be in <samp>src</samp>
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folder. All generated files should be under <samp>build</samp>, and there split into several subdirectories for the
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individual steps: <samp>classes</samp> for our compiled files and <samp>jar</samp> for our own JAR-file.</p>
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<p>We have to create only the <samp>src</samp> directory. (Because I am working on Windows, here is the Windows
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syntax—translate to your shell):</p>
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<pre class="input">md src</pre>
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<p>The following simple Java class just prints a fixed message out to STDOUT, so just write this code
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into <samp>src\oata\HelloWorld.java</samp>.</p>
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<pre>
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package oata;
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public class HelloWorld {
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public static void main(String[] args) {
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System.out.println("Hello World");
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}
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}</pre>
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<p>Now just try to compile and run that:</p>
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<pre class="input">
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md build\classes
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javac -sourcepath src -d build\classes src\oata\HelloWorld.java
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java -cp build\classes oata.HelloWorld</pre>
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which will result in
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<pre class="output">Hello World</pre>
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<p>Creating a jar-file is not very difficult. But creating a <em>startable</em> jar-file needs more steps: create a
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manifest-file containing the start class, creating the target directory and archiving the files.</p>
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<pre class="input">
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echo Main-Class: oata.HelloWorld>myManifest
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md build\jar
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jar cfm build\jar\HelloWorld.jar myManifest -C build\classes .
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java -jar build\jar\HelloWorld.jar</pre>
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<p><strong>Note</strong>: Do not have blanks around the >-sign in the <kbd>echo Main-Class</kbd> instruction because
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it would falsify it!</p>
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<h2 id="four-steps">Four steps to a running application</h2>
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<p>After finishing the Java-only step we have to think about our build process. We <em>have</em> to compile our code,
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otherwise we couldn't start the program. Oh—<q>start</q>—yes, we could provide a target for
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that. We <em>should</em> package our application. Now it's only one class—but if you want to provide a download,
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no one would download several hundreds files ... (think about a complex Swing GUI—so let us create a jar file. A
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startable jar file would be nice ... And it's a good practise to have a <q>clean</q> target, which deletes all the
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generated stuff. Many failures could be solved just by a "clean build".</p>
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<p>By default Ant uses <samp>build.xml</samp> as the name for a buildfile, so our <samp>.\build.xml</samp> would be:</p>
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<pre>
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<project>
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<target name="clean">
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<delete dir="build"/>
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</target>
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<target name="compile">
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<mkdir dir="build/classes"/>
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<javac srcdir="src" destdir="build/classes"/>
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</target>
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<target name="jar">
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<mkdir dir="build/jar"/>
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<jar destfile="build/jar/HelloWorld.jar" basedir="build/classes">
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<manifest>
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<attribute name="Main-Class" value="oata.HelloWorld"/>
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</manifest>
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</jar>
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</target>
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<target name="run">
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<java jar="build/jar/HelloWorld.jar" fork="true"/>
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</target>
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</project></pre>
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<p>Now you can compile, package and run the application via</p>
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<pre class="input">
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ant compile
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ant jar
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ant run</pre>
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<p>Or shorter with</p>
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<pre class="input">ant compile jar run</pre>
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<p>While having a look at the buildfile, we will see some similar steps between Ant and the Java-only commands:</p>
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<table>
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<tr>
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<th scope="col">Java-only</th>
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<th scope="col">Ant</th>
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</tr>
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<tr>
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<td><pre class="input">
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md build\classes
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javac
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-sourcepath src
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-d build\classes
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src\oata\HelloWorld.java
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echo Main-Class: oata.HelloWorld>mf
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md build\jar
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jar cfm
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build\jar\HelloWorld.jar
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mf
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-C build\classes
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.
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java -jar build\jar\HelloWorld.jar</pre></td>
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<td><pre>
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<mkdir dir="build/classes"/>
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<javac
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srcdir="src"
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destdir="build/classes"/>
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<em><!-- automatically detected --></em>
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<em><!-- obsolete; done via manifest tag --></em>
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<mkdir dir="build/jar"/>
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<jar
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destfile="build/jar/HelloWorld.jar"
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basedir="build/classes">
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<manifest>
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<attribute name="Main-Class" value="oata.HelloWorld"/>
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</manifest>
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</jar>
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<java jar="build/jar/HelloWorld.jar" fork="true"/></pre></td>
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</tr>
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</table>
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<h2 id="enhance">Enhance the build file</h2>
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<p>Now that we have a working buildfile, we could do some enhancements: many times you are referencing the same
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directories, main-class and jar-name are hardcoded, and while invoking you have to remember the right order of build
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steps.</p>
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<p>The first and second point would be addressed with <em>properties</em>, the third with a special property—an
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attribute of the <code><project></code> tag and the fourth problem can be solved using dependencies.</p>
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<pre>
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<project name="HelloWorld" basedir="." default="main">
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<property name="src.dir" value="src"/>
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<property name="build.dir" value="build"/>
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<property name="classes.dir" value="${build.dir}/classes"/>
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<property name="jar.dir" value="${build.dir}/jar"/>
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<property name="main-class" value="oata.HelloWorld"/>
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<target name="clean">
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<delete dir="${build.dir}"/>
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</target>
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<target name="compile">
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<mkdir dir="${classes.dir}"/>
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<javac srcdir="${src.dir}" destdir="${classes.dir}"/>
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</target>
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<target name="jar" depends="compile">
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<mkdir dir="${jar.dir}"/>
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<jar destfile="${jar.dir}/${ant.project.name}.jar" basedir="${classes.dir}">
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<manifest>
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<attribute name="Main-Class" value="${main-class}"/>
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</manifest>
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</jar>
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</target>
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<target name="run" depends="jar">
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<java jar="${jar.dir}/${ant.project.name}.jar" fork="true"/>
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</target>
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<target name="clean-build" depends="clean,jar"/>
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<target name="main" depends="clean,run"/>
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</project></pre>
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<p>Now it's easier, just do a <kbd>ant</kbd> and you will get</p>
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<pre class="output">
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Buildfile: build.xml
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clean:
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compile:
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[mkdir] Created dir: C:\...\build\classes
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[javac] Compiling 1 source file to C:\...\build\classes
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jar:
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[mkdir] Created dir: C:\...\build\jar
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[jar] Building jar: C:\...\build\jar\HelloWorld.jar
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run:
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[java] Hello World
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main:
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BUILD SUCCESSFUL</pre>
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<h2 id="ext-libs">Using external libraries</h2>
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<p>Somebody told us not to use <code>System</code>-statements. For output, we should use a Logging
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API—customizable to a high degree (including switching off during usual life (= not development) execution). We
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use Log4J for that, because</p>
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<ul>
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<li>it is not part of the JDK and we want to show how to use external libs</li>
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<li>it's highly configurable</li>
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<li>it's from Apache ;-)</li>
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</ul>
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<p>We store our external libraries in a new directory <samp>lib</samp>. Log4J can
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be <a href="https://archive.apache.org/dist/logging/log4j/1.2.17/log4j-1.2.17.zip" target="_top">downloaded
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[1]</a> from Logging's Homepage. Create the <samp>lib</samp> directory and extract the <samp>log4j-1.2.17.jar</samp>
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into that directory. After that we have to modify our Java source file to use that library and our buildfile so that
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this library could be accessed during compilation and run.</p>
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<p>Working with Log4J is documented inside its manual. Here we use the <samp>MyApp</samp>-example from
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the <a href="https://logging.apache.org/log4j/1.2/manual.html" target="_top">Short Manual [2]</a>. First we have to
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modify the java source to use the logging framework:</p>
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<pre>
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package oata;
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<b>import org.apache.log4j.Logger;</b>
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<b>import org.apache.log4j.BasicConfigurator;</b>
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public class HelloWorld {
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<b>static Logger logger = Logger.getLogger(HelloWorld.class);</b>
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public static void main(String[] args) {
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<b>BasicConfigurator.configure();</b>
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<span style="color:blue"><b>logger.info("Hello World");</b></span> // the old SysO-statement
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}
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}</pre>
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<p>Most of the modifications are "framework overhead" which has to be done once. The blue line is our "old System-out"
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statement.</p>
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<p>Don't try to run <kbd>ant</kbd>—you will only get lot of compiler errors. Log4J is not on the classpath so we
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have to do a little work here. But do not change the <code>CLASSPATH</code> environment variable! This is only for this
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project and maybe you would break other environments (this is one of the most famous mistakes when working with Ant). We
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introduce Log4J (or to be more precise: all libraries (jar-files) which are somewhere under <samp>.\lib</samp>) into our
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buildfile:</p>
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<pre>
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<project name="HelloWorld" basedir="." default="main">
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...
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<b><property name="lib.dir" value="lib"/></b>
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<b><path id="classpath"></b>
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<b><fileset dir="${lib.dir}" includes="**/*.jar"/></b>
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<b></path></b>
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...
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<target name="compile">
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<mkdir dir="${classes.dir}"/>
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<javac srcdir="${src.dir}" destdir="${classes.dir}" <b>classpathref="classpath"</b>/>
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</target>
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<target name="run" depends="jar">
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<java fork="true" <b>classname="${main-class}"</b>>
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<b><classpath></b>
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<b><path refid="classpath"/></b>
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<span style="color:red"><b><path location="${jar.dir}/${ant.project.name}.jar"/></b></span>
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<b></classpath></b>
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</java>
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</target>
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...
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</project></pre>
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<p>In this example we start our application not via its <code>Main-Class</code> manifest-attribute, because we could not
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provide a jar-name <em>and</em> a classpath. So add our class in the red line to the already defined path and start as
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usual. Running <kbd>ant</kbd> would give (after the usual compile stuff):</p>
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<pre class="output">[java] 0 [main] INFO oata.HelloWorld - Hello World</pre>
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<p>What's that?</p>
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<ul>
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<li><code>[java]</code> Ant task running at the moment</li>
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<li><code>0</code> <small>sorry, don't know—some Log4J stuff</small></li>
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<li><code>[main]</code> the running thread from our application</li>
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<li><code>INFO</code> log level of that statement</li>
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<li><code>oata.HelloWorld</code> source of that statement</li>
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<li><code>-</code> separator</li>
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<li><code>Hello World</code> the message</li>
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</ul>
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<p>For another layout ... have a look inside Log4J's documentation about using other PatternLayouts.</p>
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<h2 id="config-files">Configuration files</h2>
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<p>Why we have used Log4J? "It's highly configurable"? No—all is hardcoded! But that is not the fault of
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Log4J—it's ours. We had coded <code class="code">BasicConfigurator.configure();</code> which implies a simple, but
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hardcoded configuration. More comfortable would be using a property file. In the Java source file, delete
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the <code class="code">BasicConfiguration</code> line from the <code class="code">main()</code> method (and the
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related <code>import</code> statement). Log4J will search then for a configuration as described in its manual. Then
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create a new file <samp>src/log4j.properties</samp>. That's the default name for Log4J's configuration and using that
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name would make life easier—not only the framework knows what is inside, you too!</p>
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<pre>
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log4j.rootLogger=DEBUG, <b>stdout</b>
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log4j.appender.<b>stdout</b>=org.apache.log4j.ConsoleAppender
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log4j.appender.<b>stdout</b>.layout=org.apache.log4j.PatternLayout
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log4j.appender.<b>stdout</b>.layout.ConversionPattern=<span style="color:blue"><b>%m%n</b></span>
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</pre>
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<p>This configuration creates an output channel (<q>Appender</q>) to console named as <code>stdout</code> which prints
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the message (<q>%m</q>) followed by a line feed (<q>%n</q>)—same as the
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earlier <code class="code">System.out.println()</code> :-) Oooh kay—but we haven't finished yet. We should deliver
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the configuration file, too. So we change the buildfile:</p>
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<pre>
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...
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<target name="compile">
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<mkdir dir="${classes.dir}"/>
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<javac srcdir="${src.dir}" destdir="${classes.dir}" classpathref="classpath"/>
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<b><copy todir="${classes.dir}"></b>
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<b><fileset dir="${src.dir}" excludes="**/*.java"/></b>
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<b></copy></b>
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</target>
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...</pre>
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<p>This copies all resources (as long as they haven't the suffix <samp>.java</samp>) to the build directory, so we could
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start the application from that directory and these files will included into the jar.</p>
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<h2 id="junit">Testing the class</h2>
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<p>In this step we will introduce the usage of the JUnit [3] test framework in combination with Ant. Because Ant has a
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built-in JUnit 4.13.1 you could start directly using it. Write a test class
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in <samp>src\oata\HelloWorldTest.java</samp>:</p>
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<pre>
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package oata;
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import org.junit.Test;
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import static org.junit.Assert.fail;
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public class HelloWorldTest {
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@Test
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public void testNothing() {
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}
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@Test
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public void testWillAlwaysFail() {
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fail("An error message");
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}
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}</pre>
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<p>Because we don't have real business logic to test, this test class is very small: just showing how to start. For
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further information see the JUnit documentation [3] and the manual of <a href="Tasks/junit.html">junit</a> task. Now we
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add a <code>junit</code> instruction to our buildfile:</p>
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<pre>
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...
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<path <b>id="application"</b> location="${jar.dir}/${ant.project.name}.jar"/>
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<target name="run" depends="jar">
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<java fork="true" classname="${main-class}">
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<classpath>
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<path refid="classpath"/>
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<b><path refid="application"/></b>
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</classpath>
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</java>
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</target>
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<b><target name="junit" depends="jar">
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<junit printsummary="yes">
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<classpath>
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<path refid="classpath"/>
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<path refid="application"/>
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</classpath>
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<batchtest fork="yes">
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<fileset dir="${src.dir}" includes="**/*Test.java"/>
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</batchtest>
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</junit>
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</target></b>
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...</pre>
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<p>We reuse the path to our own jar file as defined in <q>run</q>-target by giving it an <var>id</var> and making it
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globally available. The <var>printsummary</var>=<q>yes</q> lets us see more detailed information than just a "FAILED"
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or "PASSED" message. How much tests failed? Some errors? <var>printsummary</var> lets us know. The classpath is set up
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to find our classes. To run tests the <code>batchtest</code> here is used, so you could easily add more test classes in
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the future just by naming them <code>*Test.java</code>. This is a common naming scheme.</p>
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<p>After a <kbd>ant junit</kbd> you'll get:</p>
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<pre class="output">
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...
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junit:
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[junit] Running oata.HelloWorldTest
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[junit] Tests run: 2, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 0,01 sec
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[junit] Test oata.HelloWorldTest FAILED
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BUILD SUCCESSFUL
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...</pre>
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<p>We can also produce a report. Something that you (and others) could read after closing the shell ... There are two
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steps: 1. let <code><junit></code> log the information and 2. convert these log files to something readable
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(browsable).<p>
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<pre>
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...
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<b><property name="report.dir" value="${build.dir}/junitreport"/></b>
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...
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<target name="junit" depends="jar">
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<b><mkdir dir="${report.dir}"/></b>
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<junit printsummary="yes">
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<classpath>
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<path refid="classpath"/>
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<path refid="application"/>
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</classpath>
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<b><formatter type="xml"/></b>
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<batchtest fork="yes" <b>todir="${report.dir}"</b>>
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<fileset dir="${src.dir}" includes="**/*Test.java"/>
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</batchtest>
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</junit>
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</target>
|
|
|
|
<b><target name="junitreport">
|
|
<junitreport todir="${report.dir}">
|
|
<fileset dir="${report.dir}" includes="TEST-*.xml"/>
|
|
<report todir="${report.dir}"/>
|
|
</junitreport>
|
|
</target></b></pre>
|
|
|
|
<p>Because we would produce a lot of files and these files would be written to the current directory by default, we
|
|
define a report directory, create it before running the <q>junit</q> and redirect the logging to it. The log format is
|
|
XML so <q>junitreport</q> could parse it. In a second target <q>junitreport</q> should create a browsable HTML report
|
|
for all generated XML log files in the report directory. Now you can open the <samp>${report.dir}\index.html</samp> and
|
|
see the result (looks something like JavaDoc).<br/> Personally I use two different targets
|
|
for <code><junit></code> and <code><junitreport></code>. Generating the HTML report needs some time and you
|
|
don't need the HTML report just for testing, e.g. if you are fixing an error or a integration server is doing a job.</p>
|
|
|
|
<h2 id="resources">Resources</h2>
|
|
<ol class="refs">
|
|
<li><a href="https://archive.apache.org/dist/logging/log4j/1.2.17/log4j-1.2.17.zip"
|
|
target="_top">https://archive.apache.org/dist/logging/log4j/1.2.17/log4j-1.2.17.zip</a></li>
|
|
<li><a href="https://logging.apache.org/log4j/1.2/manual.html"
|
|
target="_top">https://logging.apache.org/log4j/1.2/manual.html</a></li>
|
|
<li><a href="https://junit.org/junit4" target="_top">https://junit.org/junit4</a></li>
|
|
</ol>
|
|
|
|
</body>
|
|
</html>
|