JSP 初始化参数

JSP 初始化参数：

tomcat启动的时候就会执行那个函数；

xml：

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee

    http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID"

    version="3.0">

    <display-name>TestBootWeb</display-name>

    <servlet>

        <servlet-name>index007</servlet-name>

        <jsp-file>/index007.jsp</jsp-file>

        <init-param>

            <param-name>email</param-name>

            <param-value>s@s.com</param-value>

        </init-param>

    </servlet>

    <servlet-mapping>

        <servlet-name>index007</servlet-name>

        <url-pattern>/index007.jsp</url-pattern>

        <!-- 写成/index007.jsp的话，竟然index007.jsp和index0071.jsp都可以访问，而且是两个实例，但是获取初始化参数的时候有问题 -->

    </servlet-mapping>

    <jsp-config>

        <jsp-property-group>

            <url-pattern>/index006.jsp</url-pattern>

            <scripting-invalid>true</scripting-invalid>

        </jsp-property-group>

    </jsp-config>

    <welcome-file-list>

        <welcome-file>index.jsp</welcome-file>

    </welcome-file-list>

</web-app>

jsp：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<%

    String path = request.getContextPath();

    String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";

%>

<!DOCTYPE html>

<html>

<head>

<meta charset="UTF-8">

<title>007index</title>

</head>

<body>

    cnt is :<%=++cnt%>

    <hr>

    <%!int cnt = 0;%>

    <%!

        public void jspInit(){

        ServletConfig config = getServletConfig();

        String s = config.getInitParameter("email");

        System.out.println("s is :"+s);

    }

    %>

</body>

</html>

生成的java：

/*

 * Generated by the Jasper component of Apache Tomcat

 * Version: Apache Tomcat/7.0.35

 * Generated at: 2015-10-20 01:19:21 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 index007_jsp extends org.apache.jasper.runtime.HttpJspBase

    implements org.apache.jasper.runtime.JspSourceDependent {

int cnt = 0;

        public void jspInit(){

        ServletConfig config = getServletConfig();

        String s = config.getInitParameter("email");

        System.out.println("s is :"+s);

    }

  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 javax.el.ExpressionFactory _el_expressionfactory;

  private org.apache.tomcat.InstanceManager _jsp_instancemanager;

  public java.util.Map<java.lang.String,java.lang.Long> 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 {

    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');

      out.write('\n');

    String path = request.getContextPath();

    String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";

      out.write("\r\n");

      out.write("<!DOCTYPE html>\r\n");

      out.write("<html>\r\n");

      out.write("<head>\r\n");

      out.write("<meta charset=\"UTF-8\">\r\n");

      out.write("<title>007index</title>\r\n");

      out.write("</head>\r\n");

      out.write("<body>\r\n");

      out.write("\tcnt is :");

      out.print(++cnt);

      out.write("\r\n");

      out.write("\t<hr>\r\n");

      out.write("\t");

      out.write('\r');

      out.write('\n');

      out.write('    ');

      out.write("\r\n");

      out.write("</body>\r\n");

      out.write("</html>\r\n");

    } catch (java.lang.Throwable t) {

      if (!(t instanceof javax.servlet.jsp.SkipPageException)){

        out = _jspx_out;

        if (out != null && out.getBufferSize() != 0)

          try { 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);

    }

  }

}

JSP 初始化参数的更多相关文章

Spring MVC初始化参数绑定
初始化参数绑定与类型转换很类似,初始化绑定时,主要是参数类型 ---单日期在处理器类中配置绑定方法使用@InitBinder注解在这里首先注册一个用户编辑器参数一为目标类型 proper ...
SpringMVC初始化参数绑定--日期格式
一.初始化参数绑定[一种日期格式] 配置步骤: ①:在applicationcontext.xml中只需要配置一个包扫描器即可  <context:comp ...
SpringMvc中初始化参数绑定
初始化参数绑定与类型转换很类似,初始化绑定时,主要是参数类型 ---单日期在处理器类中配置绑定方法使用@InitBinder注解在这里首先注册一个用户编辑器参数一为目标类型 proper ...
web.xml 中以编码方式添加filter并设置初始化参数AbstractAnnotationConfigDispatchServletInitializer
web.xml中配置filter <?xml version="1.0" encoding="UTF-8"?> <web-app versio ...
springmvc的初始化参数绑定
一.springmvc的初始化参数绑定此种和我们之前说的类型转换非常相似,可以看作是一种类型转换在初始化参数绑定时重要的是参数类型 -------------------单日期的绑定二. 配 ...
Qt中新建类构造函数的初始化参数列表
使用Qt-creator自动生成一个窗体应用程序时会自动创建一个新的类,我的程序中名为MyDialog,类的定义为: #ifndef MYDIALOG_H #define MYDIALOG_H #in ...
JavaWeb---通过ServletConfig获取Servlet的初始化参数
package com.zyz; import javax.servlet.ServletConfig; import javax.servlet.ServletException; import j ...
web.xml的初始化参数
web.xml的初始化参数 ---------首先声明,这里所介绍的是web中context-param,init-param参数的初始化配置---------- ------------------ ...
RCU-数据库初始化参数
C:\Windows\System32>sqlplus sys/As123456 as sysdba SQL> show parameter processes; SQL> shut ...

随机推荐

Ant自动构建
Ant+jenkins+tomcat <project name="buildWar" default="clean"> <property ...
基于Verilog HDL 各种实验
菜鸟做的的小实验链接汇总: 1.基于Verilog HDL 的数字时钟设计 2.乘法器 3.触发器(基本的SR触发器.同步触发器.D触发器) 4.基于Verilog HDL的ADC ...
杀死进程kill和fuser
1 kill -9 id 2 不行的话使用 fuser -k -SIGHUP /opt/bre/cookiemapping/wsapi/123 fuser有一个特别的用法在于它可以一次杀死那 ...
关于easyUI的datagrid的编辑功能时的问题
编辑时,如果form中包含了id输入域,会发送一个{id,id}这样的字符串到服务端,因为javascript的function edit(){}逻辑中,已经拿到Id提交了.所以,编辑和添加功能共用的 ...
android init.rc 语法分析
此文来自于对http://source.android.com/porting/index.html中bring up段的简译.其中有一处与源码的 system/core/init/readme.tx ...
SqlServer拆分列
SELECT TOP 1000 substring([a],0,CHARINDEX('/',a)) as low,substring([a],CHARINDEX('/',a)+1,len([a])-C ...
Hibernate查询之API查询
Hibernate在检索数据上,可以使用SQL.HQL和官方API进行查询,本人主要利用API进行相关查询的小demo. 话不多少直接上demo. demo1:基本查询 /** * 默认不加任何条件的 ...
关于LCD以及BMP和RGB565
源: 关于LCD以及BMP和RGB565
dedecms标签使用
关键描述调用标签: <meta name="keywords" content="{dede:field name='keywords'/}">&l ...
3个人一起写的EI论文可以检索到啦~ --> Exploring the use of a 3D Virtual Environment in Chinese Cultural Transmission
<a href='http://www.engineeringvillage.com/blog/document.url?mid=cpx_10ed754f14b5b7381b6M764b1017 ...

JSP 初始化参数

JSP 初始化参数的更多相关文章

随机推荐

热门专题