JSP data Interaction (i)

1.JSP Built-in objects

Requested object: Request

Output object: Out

Response object: Response

Application object: Application

Conversation object: Session

Page Context object: PageContext

Pages object: page

Configuration object: Config

Exception object: Exception

Common methods for 2.request objects:

String GetParameter (string name): Gets page submission data based on page form component name

string [] getparamtervalues (string name): Gets a set of data submitted by a form component named with the same name

void Setcharacterencoding (String charset): Specifies the encoding of each request, which is set before calling the Request.getparameter () method, which can be used to solve the Chinese garbled problem

RequestDispatcher Getrequestdispatcher (String Payh): Returns a Javax.servlet.RequestDispacher object with the Foeward () of the object

Index

<%@ page language= "java" contenttype= "text/html; Charset=utf-8 "pageencoding= "UTF-8"%><! DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" "Http://www.w3.org/TR/html4/loose.dtd" >String username= Request.getparameter ("username"); String Password= Request.getparameter ("Password"); if(Username.equals ("LPs") && password.equals ("Lucky") {response.sendredirect ("Welcome.jsp"); } Else{out.println ("Please check that the user name and password are correct!" "); }    %></body>
Controller
<%@ page language= "java" contenttype= "text/html; Charset=utf-8 "pageencoding= "UTF-8"%><! DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" "Http://www.w3.org/TR/html4/loose.dtd" >
Welcome
<%@ page language= "java" contenttype= "text/html; Charset=utf-8 "    pageencoding=" UTF-8 "%><! DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" "Http://www.w3.org/TR/html4/loose.dtd" >
method is used to forward requests
JSP data Interaction (i)