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MVC Design Patterns-Learning notes

Source: Internet
Author: User
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1) If you strictly follow the MVC idea, the browser homepage is accessed by the controller and then forwarded by the Controller to the view
2) resources located in the web-inf/directory, the client cannot directly access, only through the server forwarding access
3) Request object can also be used for forwarding of resources
Request
. Getrequestdispatcher ("/web-inf/success.html")
. Forward (Request,response);
4) Verify Chinese with regular expression: [\u4e00-\ufa29]+
5) for redirection, the front and back of the two request domain objects are different, if the value is not, return "null", will not error

Java code: Modelbean 
public class ModelBean {    public boolean validate(String username){        boolean flag = false;        //username.matches("[a-zA-Z0-9]+")) 用户名是数字与字母        if(username!=null && username.matches("[\u4E00-\uFA29]+")){            flag = true;        }        return flag;    }}
Demo8 
Import Java.io.ioexception;import Javax.servlet.requestdispatcher;import Javax.servlet.servletexception;import Javax.servlet.http.httpservlet;import Javax.servlet.http.httpservletrequest;import Javax.servlet.http.httpservletresponse;import Cn.itcast.web.domain.modelbean;public class Demo8 extends HttpServlet {//no1 public void doget (HttpServletRequest request, httpservletresponse response) throws Servletexception, ioexcept        Ion {//forwards to view.html page RequestDispatcher rd = request.getrequestdispatcher ("/web-inf/view.html");    Rd.forward (Request,response); }//no2 public void DoPost (HttpServletRequest request, httpservletresponse response) throws Servletexception, Ioexcep        tion {request.setcharacterencoding ("UTF-8");        String username = request.getparameter ("username");        Modelbean MB = new Modelbean ();        Boolean flag = Mb.validate (username); if (flag) {//binds the user name to the request domain object Request.setattribute ("USERNAME", UsernaME); /* forward to Listservlet.java request. Getrequestdispatcher ("/listservlet"). Forward (requ            Est,response);        *//Redirect to Listservlet.java Response.sendredirect ("/day07/listservlet");        }else{request. Getrequestdispatcher ("/web-inf/fail.html"). Forward (Request,response); }    }}
Listservlet 
import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class ListServlet extends HttpServlet {    public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {        String username = (String) request.getAttribute("USERNAME");        response.setContentType("text/html;charset=UTF-8");        response.getWriter().write("欢迎"+username+"光临");    }    public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {        String username = (String) request.getAttribute("USERNAME");        response.setContentType("text/html;charset=UTF-8");        response.getWriter().write("欢迎"+username+"光临");         }}
Htmlview.html 
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
Sucess.html
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
Fail.html
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

MVC Design Patterns-Learning notes

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