服务器端Web应用程序中的页面重定向

Question

I have two websites say

1. firstwebsite.com
2. secondwebsite.com

All the pages in firstwebsite are static. Now I want to move all pages in firstwebsite.com to secondwebsite.com. I want to shutdown all servers of firstwebsite.com

I also want to make sure that when the URL firstwebsite.com/** should redirect to secondwebsite.com/**

firstwebsite.com/abc.html should redirect to secodnwebsite.com/abc.html

I am using springs. Can some one guide me how to do it. Later I also want to do some processing based on device from which request is sent.

It would be really great if I can get some references for above.

Answer 1

Java EE has Filters which run in every request. All request to firstwebsite.com will be handled ,first in the code, by a filter then redirected to secodnwebsite.com .

public class RedirectionFilter implements Filter {

    /**
     * Default constructor.
     */
    public RedirectionFilter () {
        // TODO Auto-generated constructor stub
    }

    /**
     * @see Filter#destroy()
     */
    @Override
    public void destroy() {
        // TODO Auto-generated method stub
    }

    @Override
    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {

            HttpServletRequest request = (HttpServletRequest) req;
            HttpServletResponse response = (HttpServletResponse) res;

            String servletPath = request.getServletPath();

            if (servletPath.endsWith(".html")) {
                response.sendRedirect("http://secondwebsite.com" + servletPath);
            }
            else {
                chain.doFilter(request, response);
            }
}
@Override
    public void init(FilterConfig fConfig) throws ServletException {
        // TODO Auto-generated method stub

    }
}

Do not forget to add this filter to deployment descriptor (web.xml). Put it to first order if you have another filters so that this filter runs first.

<filter>
    <display-name>RedirectionFilter</display-name>
    <filter-name>RedirectionFilter</filter-name>
    <filter-class>your.package.RedirectionFilter</filter-class>

  </filter>
  <filter-mapping>
    <filter-name>RedirectionFilter</filter-name>
     <servlet-name>Servlet which firstwebsite.com run</servlet-name>
  </filter-mapping>

See also

Servlet Filters

Filter Interface