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import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServlet;
import javax.servlet.ServletException;
import java.io.IOException;
import java.io.PrintWriter; //Õâ¾äimport¿ÉÊÓ¾ßÌåÇé¿öÒýÈë
3.½éÉÜÒ»ÏÂservletÖеļ¸¸ö³£Óõķ½·¨
a) protected void service(HttpSerlvetRequest req,HttpServletResponse res) throws ServletException,IOException{}
Èç¹û±»overwriteÁË£¬Ôò¿ÉÄܲ»»áµ÷ÓÃdoXXX method¡£
b)protected void doGet(HttpSerlvetRequest req,HttpServletResponse res) throws ServletException,IOException{}
ÌØÕ÷1£ºsafe and idempotent. 2£ºOnly ASCII (text) data can be sent to server with GET method. 3£ºeasy to bookmarks.
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c)protected void doPost(HttpSerlvetRequest req,HttpServletResponse res) throws ServletException,IOException{}
ÌØÕ÷1£ºnot safe and idempotent. 2disallow bookmarks.
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