CODEWITHSUNDEEP
javaservlets
user1191027
user1191027

Reputation:

Run method after doPost is complete

Is there a way to call a method() after each doPost(req, res) without having to rewrite method() at the end of each doPost block in every single servlet?

Upvotes: 2

Views: 1001

Answers (2)

Luiggi Mendoza
Luiggi Mendoza

Reputation: 85789

Just to add to the answer of JeremiahOrr, you must also verify that you're performing a POST request on your servlet, otherwise the code will also be executed for other requests like GET. This would be a more concrete example:

public class YourFilter implements Filter {
    public void init(FilterConfig filterConfig)  throws ServletException { }
    public void destroy() { }

    public void doFilter(ServletRequest request, ServletResponse response, 
        FilterChain chain) throws IOException, ServletException {
        // whatever you want to do before doPost
        chain.doFilter(request, wrapper);
        HttpServletRequest httpRequest = (HttpServletRequest) request;
        if(httpRequest.getMethod().equalsIgnoreCase("POST")) {
            //whatever you want to do after doPost only HERE
        }
        //whatever you want to do after doGet, doPost, doPut and others HERE
    }
}

Upvotes: 1

Jeremiah Orr
Jeremiah Orr

Reputation: 2630

The easiest way is probably using a servlet Filter.

public class YourFilter implements Filter {
  public void init(FilterConfig filterConfig)  throws ServletException { }
  public void destroy() { }

  public void doFilter(ServletRequest request, ServletResponse response, 
      FilterChain chain) throws IOException, ServletException {

    // whatever you want to do before doPost

    chain.doFilter(request, wrapper);

    // whatever you want to do after doPost
}

You'll then need to set up filter and filter-mapping in your web.xml. If you're using a Servlet 3.x container (like Tomcat 7+), you can use annotations.

Upvotes: 3

Related Questions