MemShellParty/vul/vul-webapp-expression/src/main/java/JEXL3Servlet.java

import org.apache.commons.jexl3.JexlBuilder;
import org.apache.commons.jexl3.JexlEngine;
import org.apache.commons.jexl3.JexlExpression;
import org.apache.commons.jexl3.MapContext;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * @author ReaJason
 * @since 2024/12/14
 */
public class JEXL3Servlet extends HttpServlet {
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        String data = req.getParameter("data");
        JexlEngine jexl = new JexlBuilder().create();
        JexlExpression e = jexl.createExpression(data);
        MapContext jc = new MapContext();
        resp.getWriter().println(e.evaluate(jc));
    }
}