1. CS/BS:
①CS: Client-Server = Client + APP Server + DB
②BS: Broswer-Server = Browser + Web Server + DB (HTTP)
2. HTML:
①Lable: text, checkbox, option, select
②Attrbute: id, name, style
③JS: alert();
④DOM: document.getElementById();
3. Servlet: using to handle data and return it to foreground
①Tomcat: including HTTP server and Web container
(1)Install:
1、Installing apache-tomcat-7.0.73.exe under D:\Tomcat 7.0
2、Creating CATALINA_HOME and add D:\Tomcat 7.0;
3、Adding %CATALINA_HOME%\lib\servlet-api.jar in CLASSPATH
4、Adding %CATALINA_HOME%\bin in Path
5、Entering D:\Tomcat 7.0\bin, and run tomcat7.exe.
6、Opening browser and input http://localhost:8080/ , if you can see the interface of Tomcat, it worked.
7、uninstall tomcat：uninstall it in control panel.
*Sometimes, the servlet-api.jar might not add in our project, so we need to add it manually.First of all, right click your project, and choose build path Secondly,add external jar; then find Tomcat 7.0/lib/servlet-api.jar.
(2)Setting in Eclipse:
1. click windown, preferences, server, runtime environment.
2. click add, choose Apache Tomcat7.0 and then click next, choose the right path of directory that you install Tomcat.
(3)The step of Servlet:
Browser（url）-->
web.xml-->
url-pattern-->
servlet-name-->
servlet-name-->
servlet-class-->
full-qualified name-->
reflect to Servlet-->
call method of service
*<welcome-first-list>: default path
(4)Error message:
404: cannot find path
500: execution error
(5)HTTP(HyperText Transfer Protocol)：①stateless protocol
②request package is encapsulated in HttpServletRequest request and response package is encapsulated in HttpServletResponse response.