Parameters in GetParameter () in Java (personal notes) __java

The arguments in the GetParameter () function are passed from the page, such as edit.jsp userid:

<%@ page language= "java" import= "java.util.*" pageencoding= "UTF-8"%> <% String Path = Request.getcontextpath ()
;
String basepath = request.getscheme () + "://" +request.getservername () + ":" +request.getserverport () +path+ "/"; %> <! DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" > 

below is the control layer:

Package Com.demo.controller;

Import java.io.IOException;
Import javax.servlet.ServletException;
Import Javax.servlet.http.HttpServlet;
Import Javax.servlet.http.HttpServletRequest;

Import Javax.servlet.http.HttpServletResponse;
Import Com.demo.dao.UserDao;

Import Com.demo.entity.User; public class Updatecontroller extends HttpServlet {protected void doget (HttpServletRequest req, httpservletrespons
   E resp) throws Servletexception, IOException {doPost (req, resp);
      } protected void DoPost (HttpServletRequest req, HttpServletResponse resp) throws Servletexception, IOException {
      String ids = Req.getparameter ("UserId"). Trim ();
      Long id = (long) 0;
      if (IDs!= null) {id = long.parselong (IDS);
      String name = Req.getparameter ("name"). Trim ();
      String Password = req.getparameter ("password"). Trim ();
      User user = new user ();
      User.setid (ID);
      User.setname (name);
      User.setpassword (password); Userdao Userdao= new Userdao ();
      Userdao.updateuser (user);
   Resp.sendredirect ("list.do"); }
}

which

String ids = Req.getparameter ("UserId"). Trim () is the value of the UserId in the page note: the trim () method is to remove the space before and after