【IT168技术文档】 
    以上xml依次定义了init（初始化），compile（编译），test（测试），doc（生成文档），pack（打包）任务，可以作为模板。 

    选中Hello工程，然后选择“Project”，“Properties”，“Builders”，“New…”，选择“Ant Build”：

    填入Name：Ant_Builder；Buildfile：build.xml；Base Directory：${workspace_loc:/Hello}（按“Browse Workspace”选择工程根目录），由于用到了junit.jar包，搜索Eclipse目录，找到junit.jar，把它复制到Hello/lib目录下，并添加到Ant的Classpath中：

    然后在Builder面板中钩上Ant_Build，去掉Java Builder：

    再次编译，即可在控制台看到Ant的输出：

Buildfile: F:\eclipse-projects\Hello\build.xml

init:

compile:
[mkdir] Created dir: F:\eclipse-projects\Hello\classes
[javac] Compiling 2 source files to F:\eclipse-projects\Hello\classes

test:
[mkdir] Created dir: F:\eclipse-projects\Hello\report
[junit] Running example.HelloTest
[junit] Tests run: 1, Failures: 0, Errors: 0, Time elapsed: 0.02 sec

pack:
[mkdir] Created dir: F:\eclipse-projects\Hello\dist
[jar] Building jar: F:\eclipse-projects\Hello\dist\hello.jar

doc:
[mkdir] Created dir: F:\eclipse-projects\Hello\doc
[javadoc] Generating Javadoc
[javadoc] Javadoc execution
[javadoc] Loading source files for package example...
[javadoc] Constructing Javadoc information...
[javadoc] Standard Doclet version 1.4.2_04
[javadoc] Building tree for all the packages and classes...
[javadoc] Building index for all the packages and classes...
[javadoc] Building index for all classes...
[javadoc] Generating F:\eclipse-projects\Hello\doc\stylesheet.css...
[javadoc] Note: Custom tags that could override future standard tags:
     @todo. To avoid potential overrides, use at least one period character (.)
      in custom tag names.
[javadoc] Note: Custom tags that were not seen: @todo
BUILD SUCCESSFUL
Total time: 11 seconds 

    Ant依次执行初始化，编译，测试，打包，生成API文档一系列任务，极大地提高了开发效率。将来开发J2EE项目时，还可加入部署等任务。并且，即使脱离了Eclipse环境，只要正确安装了Ant，配置好环境变量ANT_HOME=<nt解压目录>Path=…;%ANT_HOME%\bin，在命令行提示符下切换到Hello目录，简单地键入ant即可。