Sendredirect, include, and forward differences in Jsp/servlet

Sendredirect

Response.sendredirect ();

According to the logic, the server sends a status code, tells the browser to request a new address again, generally speaking, the browser will use all the parameters just requested again, so the session,request parameters can be obtained. Note: You cannot read with the contents of the Request.setattribute. Because it's not the same request. As shown in the figure

2 forward

(1) Inside the servlet

Request.getrequestdispatcher ("jsp2.jsp"). Forward (request, response);

(2) inside the JSP

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

This column more highlights: http://www.bianceng.cn/webkf/JSP/

The page will be the content of page 2, the address bar does not change. Use the content of Request.setattribute to work properly because it is a request forwarding. As shown in figure

3 include

(1) Inside the servlet

Request.getrequestdispatcher ("jsp2.jsp"). Include (request, response);

(2) inside the JSP

<jsp:include page= "include.jsp"/>

The page contains the contents of page 1 and page 2, and the address bar is unchanged.

Using Request.setattribute content, you can get it normally.