Programming Ant

最新推荐文章于 2025-11-26 15:59:01 发布

原创最新推荐文章于 2025-11-26 15:59:01 发布 · 2.2k 阅读

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文章标签：

#ant #java #immutable #file #import #path

本文介绍了Ant在Java项目中的常见特性，如初始化项目、共享属性、组织分层构建文件等，还提到可通过id和方法目标实现复用，支持同步调用和脚本操作。此外，阐述了Ant在大型软件开发中的特殊特性，包括访问环境和JVM变量、使用不可变属性解决配置差异问题。

Common Features

1, Initialized Project:

import java.io.File;

import org.apache.tools.ant.Project;

import org.apache.tools.ant.ProjectHelper;

public class InitializedProject extends Project {

public InitializedProject(File buildFile) {

super();

init();

ProjectHelper projectHelper = ProjectHelper.getProjectHelper();

addReference("ant.projectHelper", projectHelper);

projectHelper.parse(this, buildFile);

}

2, Share properties with plain java code

3, Organize layered build files or refer tasks/targets/properties in other build file for large scale application

4, id anywhere for reuse

</path>

5, method target anywhere for reuse

</target>

</antcall>

</target>

6, synchronized call

6, script ant

although ant is not a script language, it does glue many operations together, it can combine any "executable programs", such as "Java Class", "OS script", "OS executable program", and ant scripts itself. ant also provides many useful tasks, you can use it instead of batch file.

Special Features for Large Scale Software

1, access environment variable:

  <property environment="env"/>
  <echo message="Number of Processors = ${env.NUMBER_OF_PROCESSORS}"/>
  <echo message="ANT_HOME is set to = ${env.ANT_HOME}"/>

2, access JVM variable(http://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.html#getProperties()):

Key	Description of Associated Value
`java.version`	Java Runtime Environment version
`java.vendor`	Java Runtime Environment vendor
`java.vendor.url`	Java vendor URL
`java.home`	Java installation directory
`java.vm.specification.version`	Java Virtual Machine specification version
`java.vm.specification.vendor`	Java Virtual Machine specification vendor
`java.vm.specification.name`	Java Virtual Machine specification name
`java.vm.version`	Java Virtual Machine implementation version
`java.vm.vendor`	Java Virtual Machine implementation vendor
`java.vm.name`	Java Virtual Machine implementation name
`java.specification.version`	Java Runtime Environment specification version
`java.specification.vendor`	Java Runtime Environment specification vendor
`java.specification.name`	Java Runtime Environment specification name
`java.class.version`	Java class format version number
`java.class.path`	Java class path
`java.library.path`	List of paths to search when loading libraries
`java.io.tmpdir`	Default temp file path
`java.compiler`	Name of JIT compiler to use
`java.ext.dirs`	Path of extension directory or directories
`os.name`	Operating system name
`os.arch`	Operating system architecture
`os.version`	Operating system version
`file.separator`	File separator ("/" on UNIX)
`path.separator`	Path separator (":" on UNIX)
`line.separator`	Line separator ("/n" on UNIX)
`user.name`	User's account name
`user.home`	User's home directory
`user.dir`	User's current working directory

3, property is immutable

for large scale software development, all source files include ant build files would be committed to SCM system, but many configuration items are not same in every machine, such as Application Server setup folder and listening port; Combining "environment variable, jvm variable, and immutable property", ant provides a perfect solution for this, you can commit default property files to SCM, and put custom property file in your ${user.home}, as long as your build file would load property files in ${user.home} first.

(to be continue...)