import java.io.File;
import java.io.FileWriter;
import java.lang.reflect.Constructor;
import java.net.URL;
import java.net.URLClassLoader;
import javax.tools.JavaCompiler;
import javax.tools.StandardJavaFileManager;
import javax.tools.ToolProvider;
import javax.tools.JavaCompiler.CompilationTask;
import com.bjsxt.proxy.Moveable;
import com.bjsxt.proxy.Tank;
public class Test1 {
public static void main(String[] args) throws Exception{
String rt = "\r\n";
String src =
"package com.bjsxt.proxy;" + rt +
"public class TankTimeProxy implements Moveable {" + rt +
" public TankTimeProxy(Moveable t) {" + rt +
" super();" + rt +
" this.t = t;" + rt +
" }" + rt +
" Moveable t;" + rt +
" @Override" + rt +
" public void move() {" + rt +
" long start = System.currentTimeMillis();" + rt +
" System.out.println(\"starttime:\" + start);" + rt +
" t.move();" + rt +
" long end = System.currentTimeMillis();" + rt +
" System.out.println(\"time:\" + (end-start));" + rt +
" }" + rt +
"}";
String fileName = System.getProperty("user.dir")
+ "/src/com/bjsxt/proxy/TankTimeProxy.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:/" + System.getProperty("user.dir") +"/src")};
URLClassLoader ul = new URLClassLoader(urls);
Class c = ul.loadClass("com.bjsxt.proxy.TankTimeProxy");
System.out.println(c);
Constructor ctr = c.getConstructor(Moveable.class);
Moveable m = (Moveable)ctr.newInstance(new Tank());
m.move();
}
}
package com.bjsxt.compiler.test;
import java.lang.reflect.Method;
public class Test2 {
public static void main(String[] args) {
Method[] methods = com.bjsxt.proxy.Moveable.class.getMethods();
for(Method m : methods) {
System.out.println(m.getName());
}
}
}
package com.bjsxt.proxy;
public interface Moveable {
void move();
}
package com.bjsxt.proxy;
import java.io.File;
import java.io.FileWriter;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.net.URL;
import java.net.URLClassLoader;
import javax.tools.JavaCompiler;
import javax.tools.StandardJavaFileManager;
import javax.tools.ToolProvider;
import javax.tools.JavaCompiler.CompilationTask;
public class Proxy {
public static Object newProxyInstance(Class infce, InvocationHandler h) throws Exception { //JDK6 Complier API, CGLib, ASM
String methodStr = "";
String rt = "\r\n";
Method[] methods = infce.getMethods();
/*
for(Method m : methods) {
methodStr += "@Override" + rt +
"public void " + m.getName() + "() {" + rt +
" long start = System.currentTimeMillis();" + rt +
" System.out.println(\"starttime:\" + start);" + rt +
" t." + m.getName() + "();" + rt +
" long end = System.currentTimeMillis();" + rt +
" System.out.println(\"time:\" + (end-start));" + rt +
"}";
}
*/
for(Method m : methods) {
methodStr += "@Override" + rt +
"public void " + 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 com.bjsxt.proxy;" + rt +
"import java.lang.reflect.Method;" + rt +
"public class $Proxy1 implements " + infce.getName() + "{" + rt +
" public $Proxy1(InvocationHandler h) {" + rt +
" this.h = h;" + rt +
" }" + rt +
" com.bjsxt.proxy.InvocationHandler h;" + rt +
methodStr +
"}";
String fileName =
"d:/src/com/bjsxt/proxy/$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("com.bjsxt.proxy.$Proxy1");
System.out.println(c);
Constructor ctr = c.getConstructor(InvocationHandler.class);
Object m = ctr.newInstance(h);
//m.move();
return m;
}
}
package com.bjsxt.proxy;
import java.util.Random;
public class Tank implements Moveable {
@Override
public void move() {
System.out.println("Tank Moving...");
try {
Thread.sleep(new Random().nextInt(10000));
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
package com.bjsxt.proxy;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
public class TimeHandler implements InvocationHandler{
private Object target;
public TimeHandler(Object target) {
super();
this.target = target;
}
@Override
public void invoke(Object o, Method m) {
long start = System.currentTimeMillis();
System.out.println("starttime:" + start);
System.out.println(o.getClass().getName());
try {
m.invoke(target);
} catch (Exception e) {
e.printStackTrace();
}
long end = System.currentTimeMillis();
System.out.println("time:" + (end-start));
}
}
package com.bjsxt.proxy;
import java.lang.reflect.Method;
public interface InvocationHandler {
public void invoke(Object o, Method m);
}
package com.bjsxt.proxy;
public class Client {
public static void main(String[] args) throws Exception {
Tank t = new Tank();
InvocationHandler h = new TimeHandler(t);
Moveable m = (Moveable)Proxy.newProxyInstance(Moveable.class, h);
m.move();
}
} |
|
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