动态编译源文件时如何向JavaCompiler提供接口？
我试图在运行时编译并加载一个类，而不知道该类的包。我确实知道该类应该符合接口以及源的位置（以及类名称）。我正在尝试以下操作：
/* Compiling source */
File root = new File("scripts");
File sourceFile = new File(root, "Test.java");
JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
compiler.run(null, null, null, sourceFile.getPath());
Test.java 文件看起来像
import foo.Itest;
public class Test implements Itest{
...
}
这样 我从编译器收到 cannot find symbol symbol : class Itest 错误。如何向编译器提供接口（已加载）以避免此错误？
[编辑 - 已解决]：错误来自于接口是 ITest 并且源引用了 Itest 接口。
I'm trying to compile and load a class at runtime, without knowing the package of the class. I do know that the class should comply with an interface, and the location of the source, (and hence the class name). I'm trying the following:
/* Compiling source */
File root = new File("scripts");
File sourceFile = new File(root, "Test.java");
JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
compiler.run(null, null, null, sourceFile.getPath());
where the Test.java file looks something like
import foo.Itest;
public class Test implements Itest{
...
}
And I get a cannot find symbol symbol : class Itest error from the compiler. How do I provide the compiler with the interface (which has already been loaded) to avoid this error?
[EDIT - RESOLVED]: The error came from the fact the the interface was ITest and the source referred to an Itest interface.
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评论（3）
看起来compiler.run() 可能是在外部运行并且需要设置类路径。您是否尝试过使用最后一个参数
args向run()调用传递合适的类路径设置？也许这就是ToolProvider.getSystemToolClassLoader()的原因。这篇stackoverflow帖子可能也帮助你。
It seems likely that the
compiler.run()is running externally and needs the class path to be set. Have you tried to pass it a suitable class path setting using the last parameterargsto therun()call? Perhaps that's whyToolProvider.getSystemToolClassLoader().This stackoverflow post might also help you.
不确定这是否是您正在寻找的，但是正如 @Phil 此处，您可以尝试在
compiler.run方法中传递类路径参数。Not sure if this is what you're looking for but, as mentioned by @Phil here, you could try to pass a classpath argument in your
compiler.runmethod.您是否考虑过使用 javassist 或类似的东西生成您的类？
Have you considered generating your class with javassist or something like that?