HttpServletRequest

Functions

1. getRequestURL //full URL in type of StringBuffer: "http://localhost:8080/webapp/servlet1"
2. getRequestURI //full URL in type of String: "/webapp/servlet1"
3. getQueryString //all parameters string "name=abc&email=abc@gvace.com"
4. getRemoteAddr //client IP address
5. getRemoteHost //client host name if is registered in DNS server, return IP if not registered
6. getRemotePort //client connection port
7. getLocalPort //return server port "8080"
8. getLocalAddr //web server IP address
9. getLocalName //web server name
10. getHeader("Host") //
11. getHeaders() //return Enumeration
12. getHeaderNames() //return Enumeration
13. getParameter()
14. getParameterValues(String name) // return String[], return null if no input
15. getParameterNames()

Request Forward

• request.getRequestDispatcher("/servlet1").forward(request,response);
  //forward to another servlet within webapp, share the same request and response
  //forward url can be only within the same webapp, so no "webapp" directory needed
  //keeping the same URL in browser
  //different from response.sendRedirect("/webapp/servlet1"); using different request/response
  //after the getRequestDispatcher("/servlet1").forward(request,response), all code continues to run, so make sure to return and finish the service