<jsp:include>
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包含一个静态或动态文件
<jsp:include>与<%@ include file="路径"%>区别是前者是动态的,页面的内容可以改变,而后者是静态的,一经载入页面,将不能修改。
请看下例:
static.html
<html><body><form method=post action="jsp_include.jsp"><table><tr><td>please input your name:</td></tr><tr><td><input type=text name=name></td></tr><tr><td>input you password:</td><td><input type=text name=password></td></tr><tr><td><input type=submit value=login></td></tr></table></body></html>two.jsp<%@ page contentType="text/html; charset=gb2312" language="java"%>举例说明include的工作原理:<br>this is a1=<%=request.getParameter("a1")%><br>this is a2=<%=request.getParameter("a2")%><br><% out.println("hello from two.jsp");%>jsp_include.jsp<%@ page contentType="text/html; charset=gb2312" language="java"%><html><body><%@ include file="static.html"%><%//只是把文件包含进来%><a href="two.jsp">goto two--></a><br>this examples show include works<jsp:include page="two.jsp" flush="true"><jsp:param name="a1" value="<%=request.getParameter("name")%>" /><jsp:param name="a2" value="<%=request.getParameter("password")%>" /></jsp:include></body></html>
从浏览器里输入:
http://localhost:818/JspDemo/jsp_include.jsp
看到结果为:
下面介绍JavaBean的使用操作:
PersonBean.java
package com.bean;public class PersonBean {private String name;private String password;public void setName(String name) {this.name = name;}public void setPass(String pass) {this.password = pass;}public String getName() {return this.name;}public String getPass() {return this.password;}}login.jsp<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%><%@ page import="com.bean.*" errorPage="error.jsp"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><base href="<%=basePath%>"><title>My JSP 'login.jsp' starting page</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"><meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">--></head><body><form action="bean.jsp">name:<input type="text" name="name"><br>pass:<input type="password" name="password"><br><input type="submit" value="login"></form></body></html>
从浏览器里输入:http://localhost:818/JspDemo/login.jsp
结果为:
当点击login按钮,会跳到bean.jsp
bean.jsp
<jsp:useBean id="myPerson" scope="request" class="com.bean.PersonBean"><jsp:setProperty name="myPerson" property="name" /><jsp:setProperty name="myPerson" property="pass" param="password" /></jsp:useBean>name:<jsp:getProperty name="myPerson" property="name" />pass:<jsp:getProperty name="myPerson" property="pass" />
运行的结果为:
注意:
JavaBean的属性存取是通过setXXX(),getXXX()方法来执行,而不是根据属性的名字来存取的。
JavaBean的scope="page | request | session | application"
page在包含“<jsp:useBean>”元素的JSP文件以及该文件中所有静态包含文件中使用这个Bean,直到页面执行完毕向客户端发回响应或转到另一个文件为止。
request 在任何执行相同请求的Jsp文件中使用这个Bean,直到页面执行完毕向客户端发回响应或转到另一个文件为止。能够使用Request对象访问这个Bean,比如request.getAttribute(beanInstanceName)。
session - 从创建Bean开始,就能在任何使用相同session的jsp文件中使用这个Bean。这个Bean存在于整个Session生存周期内,任何在分享此Session的Jsp文件都能使用同一Bean。注意在创建这个Bean的Jsp文件中“<% @ page %>”指令中必须指定“session="true"”。
application - 从创建Bean开始,就能在任何使用相同application的Jsp文件中使用Bean。这个Bean存在于整个application生存周期内,任何在分享此application的Jsp文件都能使用同一Bean.
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