问题
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.
回答1:
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 parameter args to the run() call? Perhaps that's why ToolProvider.getSystemToolClassLoader().
This stackoverflow post might also help you.
回答2:
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.run method.
回答3:
Have you considered generating your class with javassist or something like that?
来源：https://stackoverflow.com/questions/3447359/how-to-provide-an-interface-to-javacompiler-when-compiling-a-source-file-dynamic