JavaWeb16.4【Cookie&Session：JSP入門】
阿新 • • 發佈：2021-07-02
index.jsp
1 <%-- 2 Created by IntelliJ IDEA. 3 User: yubaby 4 Date: 2021/7/2 5 Time: 14:35 6 To change this template use File | Settings | File Templates. 7 --%> 8 <%@ page contentType="text/html;charset=UTF-8" language="java" %> 9 <html> 10 <head> 11 <title>$Title$</title> 12 </head> 13 <body> 14 15 <% 16 System.out.println("hello jsp, i'm back"); //輸出到IDEA控制檯 17 %> 18 <h1>hi,jsp</h1> <%--輸出到瀏覽器頁面--%> 19 20 21 <% response.getWriter().write("response....."); %> 22 23 <%//在Servlet的service方法中 24 System.out.println("hello jsp, i'm back"); 25 int i = 5; 26 27 String contextPath = request.getContextPath(); //request、response、out為內建物件，不用宣告，可以直接用，因為servlet類中定義了 28 out.print(contextPath); // /day16 29 %> 30 <%! //在Servlet類的成員位置 31 inti = 3; 32 %> 33 <%= //輸出到頁面上 34 i //5，因為就近原則，service方法中定義的區域性變數i的作用域較小 35 %> 36 <%= "hello" %> 37 38 <% response.getWriter().write("response*****"); %> 39 </body> 40 </html>
index_jsp.java
1 /* 2 * Generated by the Jasper component of Apache Tomcat 3 * Version: Apache Tomcat/8.5.31 4 * Generated at: 2021-07-02 12:33:12 UTC 5 * Note: The last modified time of this file was set to 6 * the last modified time of the source file after 7 * generation to assist with modification tracking. 8 */ 9 package org.apache.jsp; 10 11 import javax.servlet.*; 12 import javax.servlet.http.*; 13 import javax.servlet.jsp.*; 14 15 public final class index_jsp extends org.apache.jasper.runtime.HttpJspBase 16 implements org.apache.jasper.runtime.JspSourceDependent, 17 org.apache.jasper.runtime.JspSourceImports { 18 19 //在Servlet類的成員位置 20 int i = 3; 21 22 private static final javax.servlet.jsp.JspFactory _jspxFactory = 23 javax.servlet.jsp.JspFactory.getDefaultFactory(); 24 25 private static java.util.Map<java.lang.String,java.lang.Long> _jspx_dependants; 26 27 private static final java.util.Set<java.lang.String> _jspx_imports_packages; 28 29 private static final java.util.Set<java.lang.String> _jspx_imports_classes; 30 31 static { 32 _jspx_imports_packages = new java.util.HashSet<>(); 33 _jspx_imports_packages.add("javax.servlet"); 34 _jspx_imports_packages.add("javax.servlet.http"); 35 _jspx_imports_packages.add("javax.servlet.jsp"); 36 _jspx_imports_classes = null; 37 } 38 39 private volatile javax.el.ExpressionFactory _el_expressionfactory; 40 private volatile org.apache.tomcat.InstanceManager _jsp_instancemanager; 41 42 public java.util.Map<java.lang.String,java.lang.Long> getDependants() { 43 return _jspx_dependants; 44 } 45 46 public java.util.Set<java.lang.String> getPackageImports() { 47 return _jspx_imports_packages; 48 } 49 50 public java.util.Set<java.lang.String> getClassImports() { 51 return _jspx_imports_classes; 52 } 53 54 public javax.el.ExpressionFactory _jsp_getExpressionFactory() { 55 if (_el_expressionfactory == null) { 56 synchronized (this) { 57 if (_el_expressionfactory == null) { 58 _el_expressionfactory = _jspxFactory.getJspApplicationContext(getServletConfig().getServletContext()).getExpressionFactory(); 59 } 60 } 61 } 62 return _el_expressionfactory; 63 } 64 65 public org.apache.tomcat.InstanceManager _jsp_getInstanceManager() { 66 if (_jsp_instancemanager == null) { 67 synchronized (this) { 68 if (_jsp_instancemanager == null) { 69 _jsp_instancemanager = org.apache.jasper.runtime.InstanceManagerFactory.getInstanceManager(getServletConfig()); 70 } 71 } 72 } 73 return _jsp_instancemanager; 74 } 75 76 public void _jspInit() { 77 } 78 79 public void _jspDestroy() { 80 } 81 82 public void _jspService(final javax.servlet.http.HttpServletRequest request, final javax.servlet.http.HttpServletResponse response) 83 throws java.io.IOException, javax.servlet.ServletException { 84 85 final java.lang.String _jspx_method = request.getMethod(); 86 if (!"GET".equals(_jspx_method) && !"POST".equals(_jspx_method) && !"HEAD".equals(_jspx_method) && !javax.servlet.DispatcherType.ERROR.equals(request.getDispatcherType())) { 87 response.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED, "JSPs only permit GET POST or HEAD"); 88 return; 89 } 90 91 final javax.servlet.jsp.PageContext pageContext; 92 javax.servlet.http.HttpSession session = null; 93 final javax.servlet.ServletContext application; 94 final javax.servlet.ServletConfig config; 95 javax.servlet.jsp.JspWriter out = null; 96 final java.lang.Object page = this; 97 javax.servlet.jsp.JspWriter _jspx_out = null; 98 javax.servlet.jsp.PageContext _jspx_page_context = null; 99 100 101 try { 102 response.setContentType("text/html;charset=UTF-8"); 103 pageContext = _jspxFactory.getPageContext(this, request, response, 104 null, true, 8192, true); 105 _jspx_page_context = pageContext; 106 application = pageContext.getServletContext(); 107 config = pageContext.getServletConfig(); 108 session = pageContext.getSession(); 109 out = pageContext.getOut(); 110 _jspx_out = out; 111 112 out.write("\n"); 113 out.write("\n"); 114 out.write("<html>\n"); 115 out.write(" <head>\n"); 116 out.write(" <title>$Title$</title>\n"); 117 out.write(" </head>\n"); 118 out.write(" <body>\n"); 119 out.write("\n"); 120 out.write(" "); 121 122 System.out.println("hello jsp, i'm back"); //輸出到IDEA控制檯 123 124 out.write("\n"); 125 out.write(" <h1>hi,jsp</h1> "); 126 out.write("\n"); 127 out.write("\n"); 128 out.write("\n"); 129 out.write(" "); 130 response.getWriter().write("response....."); 131 out.write("\n"); 132 out.write("\n"); 133 out.write(" "); 134 //在Servlet的service方法中 135 System.out.println("hello jsp, i'm back"); 136 int i = 5; 137 138 String contextPath = request.getContextPath(); //request、response、out為內建物件，不用宣告，可以直接用，因為servlet類中定義了 139 out.print(contextPath); // /day16 140 141 out.write("\n"); 142 out.write(" "); 143 out.write("\n"); 144 out.write(" "); 145 out.print( //輸出到頁面上 146 i //5，因為就近原則，service方法中定義的區域性變數i的作用域較小 147 ); 148 out.write("\n"); 149 out.write(" "); 150 out.print( "hello" ); 151 out.write("\n"); 152 out.write("\n"); 153 out.write(" "); 154 response.getWriter().write("response*****"); 155 out.write("\n"); 156 out.write(" </body>\n"); 157 out.write("</html>\n"); 158 } catch (java.lang.Throwable t) { 159 if (!(t instanceof javax.servlet.jsp.SkipPageException)){ 160 out = _jspx_out; 161 if (out != null && out.getBufferSize() != 0) 162 try { 163 if (response.isCommitted()) { 164 out.flush(); 165 } else { 166 out.clearBuffer(); 167 } 168 } catch (java.io.IOException e) {} 169 if (_jspx_page_context != null) _jspx_page_context.handlePageException(t); 170 else throw new ServletException(t); 171 } 172 } finally { 173 _jspxFactory.releasePageContext(_jspx_page_context); 174 } 175 } 176 }
apache-tomcat-8.5.31-src tomcat部分原始碼
HttpJspBase.java
1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18 package org.apache.jasper.runtime; 19 20 import java.io.IOException; 21 22 import javax.servlet.ServletConfig; 23 import javax.servlet.ServletException; 24 import javax.servlet.http.HttpServlet; 25 import javax.servlet.http.HttpServletRequest; 26 import javax.servlet.http.HttpServletResponse; 27 import javax.servlet.jsp.HttpJspPage; 28 29 import org.apache.jasper.compiler.Localizer; 30 31 /** 32 * This is the super class of all JSP-generated servlets. 33 * 34 * @author Anil K. Vijendran 35 */ 36 public abstract class HttpJspBase extends HttpServlet implements HttpJspPage { 37 38 private static final long serialVersionUID = 1L; 39 40 protected HttpJspBase() { 41 } 42 43 @Override 44 public final void init(ServletConfig config) 45 throws ServletException 46 { 47 super.init(config); 48 jspInit(); 49 _jspInit(); 50 } 51 52 @Override 53 public String getServletInfo() { 54 return Localizer.getMessage("jsp.engine.info"); 55 } 56 57 @Override 58 public final void destroy() { 59 jspDestroy(); 60 _jspDestroy(); 61 } 62 63 /** 64 * Entry point into service. 65 */ 66 @Override 67 public final void service(HttpServletRequest request, HttpServletResponse response) 68 throws ServletException, IOException 69 { 70 _jspService(request, response); 71 } 72 73 @Override 74 public void jspInit() { 75 } 76 77 public void _jspInit() { 78 } 79 80 @Override 81 public void jspDestroy() { 82 } 83 84 protected void _jspDestroy() { 85 } 86 87 @Override 88 public abstract void _jspService(HttpServletRequest request, 89 HttpServletResponse response) 90 throws ServletException, IOException; 91 }