最近在研究反射，想做一个东西，把运行的java程序饭编译（Decompile）成.java文件。现思路如下：
1.写出程序反编译一个类
2.将所有类反编译
3.java代码注入一个正在运行的java程序中
现已实现第一步：
代码如下：
//这是一个要反编译的类
public class Reflect {
private int num;
public int getNum() {
return num;
}
public void setNum(int num) {
this.num = num;
}
public String getString() {
return string;
}
public void setString(String string) {
this.string = string;
}
private String string;
public void printProperty(){
System.out.println(getNum());
System.out.println(string);
}
public void println(String s){
System.out.println(s);
}
}
//实现反编译的类，现在可以判断具体有哪些方法，但是方法里面的具体细节还不能输出
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.lang.reflect.Parameter; public class Decompile {
private Class<?> c;
private Reflect reflect;
private String className;
public Decompile(String className){
try {
this.className = className;
c = Class.forName(className);
reflect=(Reflect)c.newInstance();
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InstantiationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
//获得构造方法
public void getConstructFuntion(){
Constructor[] constructors = c.getConstructors();
for(Constructor constructor:constructors){
System.out.println(
Modifier.toString(constructor.getModifiers())
+" "
+constructor.getName()
+"("
+getParameter(constructor)
+"){}"); }
}
//获得类信息
public void getClassInfo(){
try {
System.out.println(
Modifier.toString(c.getModifiers())
+" class"
+className
+"{");
} catch (SecurityException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
//获得类属性信息
public void getProperty(){
Field[] fields = c.getDeclaredFields();
for(Field field:fields){
field.setAccessible(true);
try {
System.out.println(
Modifier.toString(field.getModifiers())
+" "
+field.getType().getSimpleName()
+" "
+field.getName()
+" = "
+field.get(reflect)
+";");
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
//获得类方法信息
public void getFuntion(){
Method[] methods=c.getDeclaredMethods();
for(Method method:methods){
System.out.println(
Modifier.toString(method.getModifiers())
+" "
+method.getReturnType().getSimpleName()
+" "
+method.getName().toString()
+"("
+getParameter(method)
+"){}");
}
}
//获得参数字符串
public String getParameter(Object obj){
Parameter[] parameters=null;
if("Method".equals(obj.getClass().getSimpleName())){
parameters = ((Method)obj).getParameters();
}
else{
parameters = ((Constructor)obj).getParameters();
}
StringBuffer sb = new StringBuffer();
int count = 0;
for(Parameter parameter:parameters){
if(count!=0){
sb.append(",");
}
sb.append(parameter.getType().getSimpleName()
+" "
+parameter.getName().toString());
count++;
}
return sb.toString();
}
}
//测试代码
public class TestReflect { public static void main(String[] args) {
Decompile decompile=new Decompile("Reflect");
decompile.getClassInfo();
decompile.getConstructFuntion();
decompile.getProperty();
decompile.getFuntion();
System.out.println("}");
}
}
下次再完成剩下