JSP application skills: To achieve three kinds of page jump mode comparison

js| Comparison | tips | page

There are approximately three ways to jump using JSPs:

1. Response.sendredirect ();
2. Response.setheader ("Location", "");
3. <jsp:forward page= ""/>

Some of the following rules have been tested:

I. Response.sendredirect ()

Out.flush () is not allowed before this statement, and if so, there will be an exception:

Java.lang.IllegalStateException:Can ' t Sendredirect () after data has committed to the client.
At Com.caucho.server.connection.AbstractHttpResponse.sendRedirect (abstracthttpresponse.java:558)
...

Browser address bar changes after jump

If you want to jump to a different host, after the jump, the statement after this statement will continue to execute, as the new thread, but the operation of the response has no meaning;

If you want to jump to the same host, the statement after this statement completes execution before jumping;

Two. Response.setheader ("Location", "")

Out.flush () is not allowed before this statement, and if so, the page will not jump.

Browser address bar changes after jump

The statement after this statement finishes execution does not jump

three. <jsp:forward page= ""/>

Out.flush () is not allowed before this statement, and if so, there will be an exception:

Java.lang.IllegalStateException:forward () allowed after buffer has committed.
At Com.caucho.server.webapp.RequestDispatcherImpl.forward (requestdispatcherimpl.java:134)
At Com.caucho.server.webapp.RequestDispatcherImpl.forward (requestdispatcherimpl.java:101)
At Com.caucho.jsp.PageContextImpl.forward (pagecontextimpl.java:836)
...

The browser address bar does not change after the jump, but can only jump to the current host

The statement after this statement finishes execution does not jump