可以用ant修改源代码吗? [英] Is it possible to modify source code with ant?

问题描述

我想在我的程序中进行条件编译.我知道如果你声明一个 public static final boolean 编译器将忽略没有遍历的分支.是否可以在构建程序之前让蚂蚁目标更改变量?

I would like to do conditional compilation in a program of mine. I know that if you declare a public static final boolean the compiler will ignore the branch that is not traversed. Is it possible to have an ant target change a variable before building the program?

例如，如果我有:

<代码>final public static boolean windows = false;

我想要两个蚂蚁目标:Windows 和 Mac.我想要命令<代码>蚂蚁窗将布尔值更改为 true，而<代码>蚂蚁麦克保持变量不变.

I would like two ant targets: Windows and Mac. I would like the command ant windows to change the boolean to true, while ant mac leaves the variable as is.

谢谢.

推荐答案

你可以让 Ant 修改一个属性文件，然后你可以很容易地在你的应用程序中读取这个文件:
new Properties(newFileInputStream("filename"/new File(filename))),

并使用以下方法读取属性:
Boolean isWindows = new Boolean(properties.getProperty("windows"))

或:
String os = properties.getProperty(操作系统").

You can get Ant to modify a properties file, and then you can read this file in your application pretty easily:
new Properties(new FileInputStream("filename" / new File(filename))),

and read properties using:
Boolean isWindows = new Boolean(properties.getProperty("windows"))

or:
String os = properties.getProperty("os").

您可以使用 Ant PropertyFile 任务来执行此操作:http://ant.apache.org/manual/Tasks/propertyfile.html.

You can use the Ant PropertyFile task for doing this: http://ant.apache.org/manual/Tasks/propertyfile.html.

如果您绝对必须使用 Ant 编辑源代码文件，这里是使用另一个任务的替代方法:

<replaceregexp file="blah.java" match="public static final boolean WINDOWS = \"(.*)\"" replace="public static final boolean WINDOWS = \"" + ${properties.windows} + "\""/>
-- 根据需要将代码替换为您自己的代码.参见 http://ant.apache.org/manual/Tasks/replaceregexp.html 了解详情.

<replaceregexp file="blah.java" match="public static final boolean WINDOWS = \"(.*)\"" replace="public static final boolean WINDOWS = \"" + ${properties.windows} + "\"" />
-- replace the code as your own as required. See http://ant.apache.org/manual/Tasks/replaceregexp.html for details.

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