ServletContext全局变量初始化

时间：2022-04-11 20:11:30

Java部分

package com.servlet;

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class ServletContext extends HttpServlet {

	private static final long serialVersionUID = 1L;

	public void doGet(HttpServletRequest request, HttpServletResponse response)

			throws ServletException, IOException {

		response.setCharacterEncoding("utf-8");

		response.setContentType("text/html");

		javax.servlet.ServletContext servletContext=getServletConfig().getServletContext();

		String uploadFolder=servletContext.getInitParameter("upload folder");

		String allowedFileType=servletContext.getInitParameter("allowed file type");

		PrintWriter out = response.getWriter();

		out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");

		out.println("<HTML>");

		out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");

		out.println("  <BODY>");

		out.println("上传文件夹××××××××××××"+uploadFolder);

		out.println("<br/>上传文件类型××××××××××××"+allowedFileType);

		out.println("  </BODY>");

		out.println("</HTML>");

		out.flush();

		out.close();

	}

}

　　web.xml

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

<web-app version="2.5"

    xmlns="http://java.sun.com/xml/ns/javaee"

    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee

    http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

  <display-name></display-name>

  <context-param>

      <param-name>upload folder</param-name>

      <param-value>attachment</param-value>

  </context-param>

  <context-param>

      <param-name>allowed file type</param-name>

      <param-value>.gif,.jpg,.bmp</param-value>

  </context-param>

  <servlet>

    <servlet-name>ServletContext</servlet-name>

    <servlet-class>com.servlet.ServletContext</servlet-class>

  </servlet>

  <servlet-mapping>

    <servlet-name>ServletContext</servlet-name>

    <url-pattern>/servlet/ServletContext</url-pattern>

  </servlet-mapping>

  <welcome-file-list>

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

  </welcome-file-list>

</web-app>

相关文章