Javaweb base session is only created when the first time it is acquired

Li Wu:
Good study and thinking, honouring teachers save Thanksgiving. Leaf See root three return to one, rivers the same oneness.
Meekness Conscience Lord, willing to do without regrets to the most bitter. Reading exercise strong body and mind, Prudential advised and the line and cherish.

Javaee:7
javase:1.8
jstl:1.2.2
Server:tomcat 8.5
Browser:chrome/firefox
Os:windows7 x64
Ide:myeclipse

Note:

The content of this post is correct, if not, to the most bitter not guarantee. Forget to add some key notes because you were careless in your record. Then, it is guaranteed that the session will only be created the first time it is acquired.

Havesessionidservlet.java

Package Com.jizuiku.servlet;import Java.io.ioexception;import Javax.servlet.requestdispatcher;import Javax.servlet.servletexception;import Javax.servlet.http.cookie;import Javax.servlet.http.httpservlet;import Javax.servlet.http.httpservletrequest;import Javax.servlet.http.httpservletresponse;import javax.servlet.http.httpsession;/** * * * @author Blog Park-to the most bitter * @version V2017.11.21 */public class Havesessionidservlet Exte NDS HttpServlet {@Overrideprotected void doget (httpservletrequest req, httpservletresponse response) throws Servletexception, IOException {//TODO auto-generated method stub//The server does not create a session immediately. Instead, the session is created when the session is first acquired. The importance of theoretical pass! Req.getsession (); get sessionreq.getsession ();//Handle Chinese Response.setcontenttype ("Text/html;charset=utf-8"); Response.getwriter (). Print ("with Jsessionid");} @Overrideprotected void DoPost (HttpServletRequest request, httpservletresponse response) throws Servletexception, IOException {//TODO auto-generated method stub}}

Nosessionidservlet.java

Package Com.jizuiku.servlet;import Java.io.ioexception;import Javax.servlet.requestdispatcher;import Javax.servlet.servletexception;import Javax.servlet.http.cookie;import Javax.servlet.http.httpservlet;import Javax.servlet.http.httpservletrequest;import Javax.servlet.http.httpservletresponse;import javax.servlet.http.httpsession;/** * * *  @author Blog Park-to the most bitter * @version V2017.11.21 */public class Nosessionidservlet extends HttpServlet {@Overrideprotected void doget (HttpServletRequest req, httpservletresponse Response) throws Servletexception, IOException {//TODO auto-generated method stub//handle Chinese Response.setcontenttype ("text/ Html;charset=utf-8 "); Response.getwriter (). Print (" no Jsessionid ");} @Overrideprotected void DoPost (HttpServletRequest request, httpservletresponse response) throws Servletexception, IOException {//TODO auto-generated method stub}}

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Javaweb base session is only created when the first time it is acquired