Ant 如何从自定义 Java 系统属性中获取值

Question

In my java class I have

System.setProperty("test", drinks);

In my Ant build file I am able to execute the jave class. How can I use the name "test" to get the result ${drinks} in Ant ??

Answer 1

The only way this is possible is if you use the attribute fork="false" (false being the default value) in the java Ant task. That is, if your Java program is executed in the same JVM as Ant. Otherwise, your Java program will be executed in a separate process and none of the system properties it sets will vbe accessible to Ant. Beware, though, that executing a non-forked Java program may (and often will) have undesired side effects on the rest of the Ant build.

Answer 2

如果在命令行中设置了该属性，例如ant -Dtest=drinks它将作为${test}从构建系统中可用，但是如果您通过执行 Java 代码调用此属性，则需要找到一个从生成的 Java 进程中获取值到一个新变量中的方法，通常使用System.out.println(...)和<exec ...>任务的outputproperty的outputproperty并根据需要进行解析。