运行Ant非常简单，当你正确地安装Ant后，只要输入ant就可以了。
没有指定任何参数时，Ant会在当前目录下查询build.xml文件。
如果找到了就用该文件作为buildfile。
如果你用 -find 选项，Ant就会在上级目录中寻找buildfile，直至到达文件系统的根目录。
要想让Ant使用其他的buildfile，可以用参数 -buildfile file，这里file指定了你想使用的buildfile。
可以指定执行一个或多个target。
当省略target时，Ant使用标签的default属性所指定的target。
命令行选项总结：ant [options] [target [target2 [target3] ...]]
Options:
-help, -h print this message
-projecthelp, -p print project help information
-version print the version information and exit
-diagnostics print information that might be helpful to
diagnose or report problems.
-quiet, -q be extra quiet
-verbose, -v be extra verbose
-debug, -d print debugging information
-emacs, -e produce logging information without adornments
-lib <path> specifies a path to search for jars and classes
-logfile <file> use given file for log
-l <file> ''
-logger <classname> the class which is to perform logging
-listener <classname> add an instance of class as a project listener
-noinput do not allow interactive input
-buildfile <file> use given buildfile
-file <file> ''
-f <file> ''
-D<property>=<value> use value for given property
-keep-going, -k execute all targets that do not depend
on failed target(s)
-propertyfile <name> load all properties from file with -D
properties taking precedence
-inputhandler <class> the class which will handle input requests
-find <file> (s)earch for buildfile towards the root of
-s <file> the filesystem and use it
-nice number A niceness value for the main thread:
1 (lowest) to 10 (highest); 5 is the default
-nouserlib Run ant without using the jar files from
${user.home}/.ant/lib
-noclasspath Run ant without using CLASSPATH
-autoproxy Java1.5+: use the OS proxy settings
-main <class> override Ant's normal entry point例如：ant 使用当前目录下的build.xml运行Ant，执行缺省的target。ant -buildfile test.xml 用当前目录下的test.xml运行Ant，执行缺省的target。ant -buildfile test.xml dist 使用当前目录下的test.xml运行Ant，执行一个叫做dist的target。ant -buildfile test.xml -Dbuild=build/classes dist使用当前目录下的test.xml运行Ant，执行一个叫做dist的target，并设定build属性的值为build/classes。