import org.codehaus.janino.ClassLoaderIClassLoader; //导入依赖的package包/类
public UnaryDoubleFunction compile(String expression) throws Exception {
	if (!java.util.regex.Pattern.matches(
			"^[a-zA-Z0-9+\\-()/\\* \t^%\\.\\?]+$", expression)) {
		throw new SecurityException();
	}

	String classPackage = getClass().getPackage().getName() + ".compiled";
	String className = "JaninoCompiledFastexpr"
			+ COMPILED_CLASS_INDEX.incrementAndGet();
	String source = "package " + classPackage + ";\n"
			+ "import static java.lang.Math.*;\n" + "public final class "
			+ className + " implements "
			+ UnaryDoubleFunction.class.getCanonicalName() + " {\n"
			+ "public double evaluate(double x) {\n"
			+ "return (" + expression + ");\n" + "}\n" + "}";
	Scanner scanner = new Scanner(null, new ByteArrayInputStream(
			source.getBytes("UTF-8")), "UTF-8");

	JaninoRestrictedClassLoader cl = new JaninoRestrictedClassLoader();
	UnitCompiler unitCompiler = new UnitCompiler(
			new Parser(scanner).parseCompilationUnit(),
			new ClassLoaderIClassLoader(cl));
	ClassFile[] classFiles = unitCompiler.compileUnit(true, true, true);
	Class<?> clazz = cl.defineClass(classPackage + "." + className,
			classFiles[0].toByteArray());

	return (UnaryDoubleFunction) clazz.newInstance();
}
 

import org.codehaus.janino.ClassLoaderIClassLoader; //导入依赖的package包/类
public JaninoClassCompiler(ClassLoader parentClassLoader, boolean debug) {
  super(debug);
  this.compilationClassLoader = new ClassLoaderIClassLoader(parentClassLoader);
}
 

import org.codehaus.janino.ClassLoaderIClassLoader; //导入依赖的package包/类
@VisibleForTesting
JaninoClassCompiler(ClassLoader parentClassLoader) {
  this.compilationClassLoader = new ClassLoaderIClassLoader(parentClassLoader);
}