標籤：null ceo work getattr height time lease end static
JSP ————> servlet
我的第1個Java Web應用程式——index.jsp
我的第2個Java Web應用程式——welcome-file
我的第3個Java Web應用程式——conf/server.xml
我的第4個Java Web應用程式——jsp page
我的第5個Java Web應用程式——jsp 指令碼
我的第6個Java Web應用程式——jsp 聲明
我的第7個Java Web應用程式——JSP 運算式
我的第8個Java Web應用程式——JSP頁面生命週期
我的第8個Java Web應用程式——我的乘法口訣表！
1
<!doctype html><html lang="en"> <head> <meta charset="UTF-8"> <meta name="Generator" content="EditPlus®"> <meta name="Author" content=""> <meta name="Keywords" content=""> <meta name="Description" content=""> <title>Document</title> </head> <body> <h1>???????</h1> </body></html>
<?xml version="1.0" encoding="ISO-8859-1" ?><web-app xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" version="2.4"></web-app>
2
<?xml version="1.0" encoding="ISO-8859-1" ?><web-app xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" version="2.4"> <welcome-file-list> <welcome-file>/index.jsp</welcome-file> </welcome-file-list></web-app>
3
4
jsp=java server page
<%@ page language="java" import="java.util.*" contentType="text/html;charset=utf-8" %><html> <body> <h1 align="center">啤酒推薦</h1> <p> <% List styles = (List)request.getAttribute("styles"); Iterator it = styles.iterator(); while (it.hasNext()) { out.print("<br>try: " + it.next()); } %> </body></html>
5
<%@ page language="java" import="java.util.*" contentType="text/html;charset=utf-8" %><html> <body> <h1 align="center">啤酒推薦</h1> <p> <% List styles = (List)request.getAttribute("styles"); Iterator it = styles.iterator(); while (it.hasNext()) { out.print("<br>try: " + it.next()); } %> <% out.print("<br /><br />今天天氣貌似不錯！"); // out是一個內建的對象！ %> </body></html>
6
兩種聲明方式的差異。參考：http://www.cnblogs.com/zengmiaogen/archive/2012/04/15/2450414.html
我們既可以在<%%>中聲明變數，也可以在<%!%>中聲明變數，
那麼，這兩種聲明方式有什麼區別呢？事實上，<%!%>相當於類的執行個體域，而<%%>相當於方法體。
// TO-DO
7
<%@ page language="java" import="java.util.*" contentType="text/html;charset=utf-8" %><html> <body> <p>this is a simple test</p> <%! String words = "this is a simple test."; int sum(int x, int y) { return x + y; } %> <p>words=<%=words%></p> <p>3+4=<%=sum(3,4)%></p> </body></html>
8
當我們訪問jsp頁面的時候，jsp引擎（web容器）首先判斷是否是第一次請求...
這個時候我就想，要是可以直接看到它編譯出來的位元組碼就好了，那麼到哪裡查看呢？——答案是在tomcat的work目錄下，不僅有位元組碼，還有原始碼，我們查看一下上一節的代碼。
/* * Generated by the Jasper component of Apache Tomcat * Version: Apache Tomcat/7.0.77 * Generated at: 2017-06-09 10:07:20 UTC * Note: The last modified time of this file was set to * the last modified time of the source file after * generation to assist with modification tracking. */package org.apache.jsp;import javax.servlet.*;import javax.servlet.http.*;import javax.servlet.jsp.*;import java.util.*;public final class test_jsp extends org.apache.jasper.runtime.HttpJspBase implements org.apache.jasper.runtime.JspSourceDependent { String words = "this is a simple test."; int sum(int x, int y) { return x + y; } private static final javax.servlet.jsp.JspFactory _jspxFactory = javax.servlet.jsp.JspFactory.getDefaultFactory(); private static java.util.Map<java.lang.String,java.lang.Long> _jspx_dependants; private volatile javax.el.ExpressionFactory _el_expressionfactory; private volatile org.apache.tomcat.InstanceManager _jsp_instancemanager; public java.util.Map<java.lang.String,java.lang.Long> getDependants() { return _jspx_dependants; } public javax.el.ExpressionFactory _jsp_getExpressionFactory() { if (_el_expressionfactory == null) { synchronized (this) { if (_el_expressionfactory == null) { _el_expressionfactory = _jspxFactory.getJspApplicationContext(getServletConfig().getServletContext()).getExpressionFactory(); } } } return _el_expressionfactory; } public org.apache.tomcat.InstanceManager _jsp_getInstanceManager() { if (_jsp_instancemanager == null) { synchronized (this) { if (_jsp_instancemanager == null) { _jsp_instancemanager = org.apache.jasper.runtime.InstanceManagerFactory.getInstanceManager(getServletConfig()); } } } return _jsp_instancemanager; } public void _jspInit() { } public void _jspDestroy() { } public void _jspService(final javax.servlet.http.HttpServletRequest request, final javax.servlet.http.HttpServletResponse response) throws java.io.IOException, javax.servlet.ServletException { final javax.servlet.jsp.PageContext pageContext; javax.servlet.http.HttpSession session = null; final javax.servlet.ServletContext application; final javax.servlet.ServletConfig config; javax.servlet.jsp.JspWriter out = null; final java.lang.Object page = this; javax.servlet.jsp.JspWriter _jspx_out = null; javax.servlet.jsp.PageContext _jspx_page_context = null; try { response.setContentType("text/html;charset=utf-8"); pageContext = _jspxFactory.getPageContext(this, request, response, null, true, 8192, true); _jspx_page_context = pageContext; application = pageContext.getServletContext(); config = pageContext.getServletConfig(); session = pageContext.getSession(); out = pageContext.getOut(); _jspx_out = out; out.write("\r\n"); out.write("\r\n"); out.write("<html>\r\n"); out.write(" <body>\r\n"); out.write(" \t<p>this is a simple test</p>\r\n"); out.write(" \t"); out.write("\r\n"); out.write(" \t<p>words="); out.print(words); out.write("</p>\r\n"); out.write(" \t<p>3+4="); out.print(sum(3,4)); out.write("</p>\r\n"); out.write(" </body>\r\n"); out.write("</html>"); } catch (java.lang.Throwable t) { if (!(t instanceof javax.servlet.jsp.SkipPageException)){ out = _jspx_out; if (out != null && out.getBufferSize() != 0) try { if (response.isCommitted()) { out.flush(); } else { out.clearBuffer(); } } catch (java.io.IOException e) {} if (_jspx_page_context != null) _jspx_page_context.handlePageException(t); else throw new ServletException(t); } } finally { _jspxFactory.releasePageContext(_jspx_page_context); } }}
9
<%@ page language="java" import="java.util.*" contentType="text/html;charset=utf-8" %><html> <body> <p>這是我的乘法口訣表！</p> <% for (int i = 1; i <= 9; ++i) { for (int j = 1; j <= i; ++j) { out.print(i + " * " + j + " = " + i*j + " "); } out.print("<br />"); } %> </body></html>
看完視頻後修改了一下， 是空格預留位置
<%@ page language="java" import="java.util.*" contentType="text/html;charset=utf-8" %><html> <body> <p>這是我的乘法口訣表！</p> <%! void printTable() { for (int i = 1; i <= 9; ++i) { for (int j = 1; j <= i; ++j) { out.print(i + " * " + j + " = " + i*j + " "); } out.print("<br />"); } } %> <% printTable(); %> </body></html>
JSP筆記01——基礎文法
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