ServletContext全局变量初始化
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>
