public class Proxy {
public static Object newProxyInstance(Class infce, InvocationHandler invocationHandler) throws Exception { //JDK6 Complier API, CGLib, ASM
String methodStr = "";
String rt = "\r\n";
Method[] methods = infce.getMethods();
for(Method m : methods) {
Class<?> returnType = m.getReturnType();
methodStr += "@Override" + rt +
"public "+returnType+" " + m.getName() + "() {" + rt +
" try {" + rt +
" Method md = " + infce.getName() + ".class.getMethod(\"" + m.getName() + "\");" + rt +
" h.invoke(this, md);" + rt +
" }catch(Exception e) {e.printStackTrace();}" + rt +
"}";
}
String src =
"package proxy.tank;" + rt +
"import java.lang.reflect.Method;" + rt +
"public class $Proxy1 implements " + infce.getName() + "{" + rt +
" public $Proxy1(InvocationHandler h) {" + rt +
" this.h = h;" + rt +
" }" + rt +
" proxy.tank.InvocationHandler h;" + rt +
methodStr +
"}";
String fileName =
"d:/src/proxy/tank/$Proxy1.java";
File f = new File(fileName);
FileWriter fw = new FileWriter(f);
fw.write(src);
fw.flush();
fw.close();
//compile
JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
StandardJavaFileManager fileMgr = compiler.getStandardFileManager(null, null, null);
Iterable units = fileMgr.getJavaFileObjects(fileName);
CompilationTask t = compiler.getTask(null, fileMgr, null, null, null, units);
t.call();
fileMgr.close();
//load into memory and create an instance
URL[] urls = new URL[] {new URL("file:/" + "d:/src/")};
URLClassLoader ul = new URLClassLoader(urls);
Class c = ul.loadClass("proxy.tank.$Proxy1");
System.out.println(c);
Constructor ctr = c.getConstructor(InvocationHandler.class);
Object m = ctr.newInstance(invocationHandler);
return m;
}
}
public class Client {
public static void main(String[] args) throws Exception {
Tank1 t = new Tank1();
InvocationHandler h = new TimeHandler(t);
MoveAble m = (MoveAble)Proxy.newProxyInstance(MoveAble.class, h);
m.move();
}
}