第一个JSP程序(JSP入门)-白红宇

第一个JSP程序(JSP入门)

阅读量：2496 次

发布时间：2019-05-11

本文共 3761 字，大约阅读时间需要 12 分钟。

在web根目录新建index.jsp文件

<%@ page language="java" contentType="text/html; charset=GBK"%>
   Insert title here当前系统时间<%out.println(new java.util.Date()); %>

配置web.xml

启动tomcat

浏览器显示输出

当前系统时间 Tue Jun 30 20:35:20 CST 2015

查看jsp对应的java类文件

在D:\apache-tomcat-7.0.62\work\Catalina\localhost\ServletStudy\org\apache\jsp可以找到index_jsp.java文件，文件内容如下

/* * Generated by the Jasper component of Apache Tomcat * Version: Apache Tomcat/7.0.62 * Generated at: 2015-06-30 12:35:20 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.*;public final class index_jsp extends org.apache.jasper.runtime.HttpJspBase    implements org.apache.jasper.runtime.JspSourceDependent {  private static final javax.servlet.jsp.JspFactory _jspxFactory =          javax.servlet.jsp.JspFactory.getDefaultFactory();  private static java.util.Map
   
     _jspx_dependants;  private javax.el.ExpressionFactory _el_expressionfactory;  private org.apache.tomcat.InstanceManager _jsp_instancemanager;  public java.util.Map
    
      getDependants() {    return _jspx_dependants;  }  public void _jspInit() {    _el_expressionfactory = _jspxFactory.getJspApplicationContext(getServletConfig().getServletContext()).getExpressionFactory();    _jsp_instancemanager = org.apache.jasper.runtime.InstanceManagerFactory.getInstanceManager(getServletConfig());  }  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 {//JSP隐含对象有以下对象    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=GBK");      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("\r\n");      out.write("\r\n");      out.write("
     \r\n");      out.write("
     Insert title here\r\n");      out.write("\r\n");      out.write("\r\n");      out.write("当前系统时间\r\n");out.println(new java.util.Date());       out.write("\r\n");      out.write("\r\n");      out.write("");    } 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);    }  }}