minutes for 2021/10/26

2021/10/27 6:09:31

编程Tag： session Request redirect content servlet response 10 26 minutes

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9:00am-11:00pm

web http request and response;

request sample:

GET / HTTP/1.1
Host: www.sina.com.cn
User-Agent: Mozilla/5.0 xxx
Accept: */*

response sample

HTTP/1.1 200 OK
Content-Type: text/html
Content-Length: 21932
Content-Encoding: gzip
Cache-Control: max-age=300
<html>...data...

servlet API from java EE which needs Maven to import with a pom.xml file. run on Tomcat server.

@WebServlet(urlPatterns="/hello")

**servlet extents Httpservlet{

doGet(HttpServletRequest, HttpServletResonse){}

doPost(HttpServletRequest, HttpServletResonse){}

}

redirect and forward

redirect can be used to update a web

forward can be used to reuse a function in one servlet

Session and Cookie

A session for login and logout and cookie can use the default language setting

JSP: java server pages .jsp ,equal to a servlet functionally.

build-in parameter: out; session; request.

combine the weaknesses and strengths of the servlet and JSP to realize the MVC

filter: chain.doFilter(request,response)

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