Java Web Foundation Summary of JSP JavaBean

Java Web Foundation Summary

In computing, Java Web Start (also known as Javaws, Javaws or JAWS) are a framework developed by Sun Microsystems (now Orac Le) that allows users to start application software for the Java Platform directly from the Internet using a Web browser. Some Key benefits of this technology include seamless version updating for globally distributed applications and greater C Ontrol of memory allocation to the Java virtual machine.

JSP execution principle

Script

<%    //java代码    String username="admin";%>

An expression

<%=username%>

Instruction Element page directive

<%@ page language="java" contentType="text/html;charset=utf-8"%>

Include directives

<%@file="login.jsp"%>

TAGLIB directive

<%@ taglib uri="标签库URI" prefix="标签前缀"%>

Action element include

<jsp:include page="login.jsp" flush="true">    <jsp:param name="username"value="admin" /></jsp:include>

Forward

<jsp:forward page="success.jsp">    <jsp:param name="username" value="admin" /></jsp:forward>

Usebean

<jsp:useBean id="user"class="org.info.User"scope="page"/>

Scope includes page,request,session,application

SetProperty

name="user"property="username" value="admin"name="user"property="username" param="username"/>

GetProperty

name="user"property="username" />

Get a value of type string

Built-in objects

Request

Response

| ————————————-| ————————— –|
| void setContentType (String name) | Set the type and character encoding of the response content |
| void Sendredirect (String URL) | Redirect to the specified URL resource |

Method	Role
void setContentType (String name)	Set the type and character encoding of the response content
void Sendredirect (String URL)	Redirect to the specified URL resource

Out

Session

Application

Method	Role
void SetAttribute (String name,object value)	Storing application domain properties as key-value pairs
Object getattribute (String name)	Get property values based on property name
void RemoveAttribute (String name)	Remove an attribute from a application field based on the property name

PageContext

Page

<%=this.getServletInfo()%>

Config

exception

<%    exception.printStackTrace(response.getWriter());%>

JavaBean Design Principles

JSP using JavaBean

<jsp:useBean><jsp:setProperty><jsp:getProperty>

Java Web Foundation Summary of JSP JavaBean