javax.tools를 사용하여 대부분의 방법을 사용할 수 있습니다. 이 코드는 오히려 길고 정확하게 이것을 수행하는 가장 효율적이거나 이식 가능한 방법은 아니지만 아이디어를 얻어야합니다.
import javax.tools.*;
import java.util.*;
import java.io.*;
import java.lang.reflect.*;
public class Test {
public static void main(String[] args) throws Exception {
JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
JavaFileObject fileObj =
new StringJavaFileObject("public class InterpTest { public static void test() { System.out.println(\"Hello World\"); } }");
List<JavaFileObject> tasks = new ArrayList<JavaFileObject>();
tasks.add(fileObj);
JavaFileManager defFileMgr = compiler.getStandardFileManager(null, null, null);
MemoryJavaFileManager fileMgr = new MemoryJavaFileManager(defFileMgr);
compiler.getTask(null, fileMgr, null, null, null, tasks).call();
ClassLoader loader = new ByteArrayClassLoader();
Class clazz = loader.loadClass("InterpTest");
Method method = clazz.getMethod("test");
method.invoke(null);
}
public static class StringJavaFileObject extends SimpleJavaFileObject {
protected String str;
public StringJavaFileObject(String str) {
super(java.net.URI.create("file:///InterpTest.java"), JavaFileObject.Kind.SOURCE);
this.str = str;
}
@Override
public CharSequence getCharContent(boolean ignoreEncErrors) {
return str;
}
}
public static class MemoryJavaFileObject extends SimpleJavaFileObject {
public static ByteArrayOutputStream out = new ByteArrayOutputStream();
public MemoryJavaFileObject(String uri, JavaFileObject.Kind kind) {
super(java.net.URI.create(uri), kind);
}
@Override
public OutputStream openOutputStream() {
return out;
}
}
public static class ByteArrayClassLoader extends ClassLoader {
public Class findClass(String name) {
byte[] bytes = MemoryJavaFileObject.out.toByteArray();
return super.defineClass(name, bytes, 0, bytes.length);
}
}
public static class MemoryJavaFileManager implements JavaFileManager {
protected JavaFileManager parent;
public JavaFileObject getJavaFileForOutput(JavaFileManager.Location location, String className, JavaFileObject.Kind kind, FileObject sibling) throws IOException {
return new MemoryJavaFileObject("file:///InterpTest.class", kind);
}
public MemoryJavaFileManager(JavaFileManager parent) { this.parent = parent; }
public void close() throws IOException { parent.close(); }
public void flush() throws IOException { parent.flush(); }
public ClassLoader getClassLoader(JavaFileManager.Location location) { return parent.getClassLoader(location); }
public FileObject getFileForInput(JavaFileManager.Location location, String packageName, String relName) throws IOException { return parent.getFileForInput(location, packageName, relName); }
public FileObject getFileForOutput(JavaFileManager.Location location, String packageName, String relName, FileObject sibling) throws IOException { return parent.getFileForOutput(location, packageName, relName, sibling); }
public JavaFileObject getJavaFileForInput(JavaFileManager.Location location, String className, JavaFileObject.Kind kind) throws IOException { return parent.getJavaFileForInput(location, className, kind); }
public boolean handleOption(String current, Iterator<String> remaining) { return parent.handleOption(current, remaining); }
public boolean hasLocation(JavaFileManager.Location location) { return parent.hasLocation(location); }
public String inferBinaryName(JavaFileManager.Location location, JavaFileObject file) { return parent.inferBinaryName(location, file); }
public boolean isSameFile(FileObject a, FileObject b) { return parent.isSameFile(a, b); }
public Iterable<JavaFileObject> list(JavaFileManager.Location location, String packageName, Set<JavaFileObject.Kind> kinds, boolean recurse) throws IOException { return parent.list(location, packageName, kinds, recurse); }
public int isSupportedOption(String option) { return parent.isSupportedOption(option); }
}
}
나는 사용자가 '악용하다'라는 두려움은 주요한 악이 아니라고 생각한다. 대부분의 경우 eval을 남용하는 프로그래머입니다. Java와 같은 강력한 형식의 언어에서는 eval이 유지 보수 프로그래머를 혼란에 빠뜨립니다. – Josiah
왜 이것을하고 싶습니까? 이것이 유용 할 실제 상황이 없다고 생각할 수 있습니다. XY 문제가있는 것 같아요. – Raedwald