Ant HelloWorld
开始学习一下ANT，在网上查了些资料，走出HELLOWORLD第一步
一.配置JDK,ANT：
系统环境变量配置：
JAVA_HOME:D:\jdk1.6.0_10
PATH:%JAVA_HOME%/bin;%JAVA_HOME%/jre/bin
CLASSPATH:.;%JAVA_HOME%/lib/dt.jar;%JAVA_HOME%/lib/tools.jar (要加.表示当前路径)
ANT_HOME:E:\apache-ant-1.8.2
PATH:%ANT_HOME%\bin; %ANT_HOME%\lib
打开CMD，输入java -version，输入ant，有相关提示说明配置成功
二、HELLOWORLD
1.新建src文件夹，在其中放入HelloWorld.java文件，内容如下：
public class HelloWorld{
public static void main(String[] args){
System.out.println("Hello world");
}
}
2.在src同级目录下放入build.xml文件，注意要保存成UTF-8格式。内容如下：
<?xml version="1.0" encoding="UTF-8" ?>
<!--ant的所有内容必须包含在project中，name是名字，
basedir是根目录 .代表当前目录。default代表默认要做的事情-->
<project name="HelloWorld" default="run" basedir=".">
<!--property类似程序中的变量-->
<property name="src" value="src"/>
<property name="dest" value="classes"/>
<property name="hello_jar" value="hello.jar"/>
<!--target类似于方法，depends表示依赖的方法，如果未执行则先执行-->
<target name="init">
<!--mkdir用于创建目录-->
<mkdir dir="${dest}"/>
</target>
<target name="compile" depends="init">
<javac srcdir="${src}" destdir="${dest}"/>
</target>
<target name="build" depends="compile">
<jar jarfile="${hello_jar}" basedir="${dest}"/>
</target>
<target name="run" depends="build">
<java classname="HelloWorld" classpath="${hello_jar}"/>
</target>
<target name="clean">
<delete dir="${dest}" />
<delete file="${hello_jar}" />
</target>
<target name="rerun" depends="clean,run">
<ant target="clean" />
<ant target="run" />
</target>
</project>
3.打开CMD，进入工程目录，输入ant(执行默认目标)或ant -file build.xml即可编译
E:\JavaWorkSpace\HelloWorld>ant -file build.xml
Buildfile: E:\JavaWorkSpace\HelloWorld\build.xml
init:
[mkdir] Created dir: E:\JavaWorkSpace\HelloWorld\classes
compile:
[javac] E:\JavaWorkSpace\HelloWorld\build.xml:15: warning: 'includeantruntim
e' was not set, defaulting to build.sysclasspath=last; set to false for repeatab
le builds
[javac] Compiling 1 source file to E:\JavaWorkSpace\HelloWorld\classes
build:
[jar] Building jar: E:\JavaWorkSpace\HelloWorld\hello.jar
run:
[java] Hello world
BUILD SUCCESSFUL
Total time: 4 seconds
4.输入ant clean即可清除编译
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