code to run .exe file from jsp page

Firstly you need to be familiar with java servlets. Here's some basic steps:

1. Create a servlet to run the exe program

package mycompany;

public ExeRunnerServlet extends HttpServlet {
  protected doGet(HttpServletRequest req, HttpServletResponse res) throws Exception {
    String cmdToRunExe = //..

    // Implement exe running here..

    PrintWriter writer = res.getWriter();
    writer.append("Command has been run");
  }
}

This servlet only service GET http method. Search online for the code on how to run exe in Java, eg: https://stackoverflow.com/a/10686041/179630.

2. Map the servlet on you WEB-INF/web.xml deployment descriptor

<web-app>
  <servlet>
    <servlet-class>mycompany.ExeRunnerServlet</servlet-class>
    <servlet-name>ExeRunnerServlet</servlet-name>
  </servlet>

  <servlet-mapping>
    <servlet-name>ExeRunnerServlet</servlet-name>
    <url-pattern>/exerunner</url-pattern>
  </servlet-mapping>
</web-app>

This will map the above servlet into http://myhost/mywarname/exerunner

3. Link it from JSP

Finally on your JSP you can create a html link to above servlet that will execute your exe program. Assuming your jsp is located at http://myhost/mywarname/page.jsp :

<a href="exerunner">Run exe command</a>

Few words of warnings

• Creating a single servlet and mapping them manually into web.xml is considered an obsolete approach. Consider newer web framework such as Spring MVC / JSF.
• Calling exe from java is often regarded as a bad approach, especially if process forking is involved. I've seen cases where jvm took 800mb memory and the whole process had to be temporarily duplicated just to invoke exe command. Consider other integration approach such as web services.