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| RequestDispatcher.include vs. RequestDispatcher.forward |
if(failed){
request.setAttribute("request_attr", "request_attr_value");
session.setAttribute("session_attr", "session_attr_value");
request.getRequestDispatcher("service_B.jsp").include(request, response);
...
request.getRequestDispatcher("service_C.jsp").include(request, response);
}else{
...
}
or
if(failed){
request.setAttribute("request_attr", "request_attr_value");
session.setAttribute("session_attr", "session_attr_value");
request.getRequestDispatcher("service_B.jsp").forward(request, response);
return;
}else{
...
}
The key difference between the two is the fact that the include method leaves the output stream open, whereas the forward method will close the output stream after it has been invoked.
With include, you can continue processing any stuff which can be put into output stream or even inject another jsp page (service_C.jsp); With forward, however, you had better stop (return;) unless the remaining task is just background stuff, otherwise, IllegalStateException would be thrown.
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posted on: 09/17/2012 02:39:34 PM
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