1.config實(shí)質(zhì)上是ServletConfig的一個(gè)實(shí)例

2.config常用來(lái)獲取Servlet的初始化參數(shù)

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"> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list><!-- config對(duì)象獲取Servlet初始化參數(shù) --> <servlet> <servlet-name>config</servlet-name> <servlet-class>com.test.servlet.Config</servlet-class> <init-param> <param-name>name</param-name> <param-value>小翁</param-value> </init-param> <init-param> <param-name>age</param-name> <param-value>22</param-value> </init-param> </servlet> <servlet-mapping> <servlet-name>config</servlet-name> <url-pattern>/config</url-pattern> </servlet-mapping> </web-app>

　　

Config.java

package com.test.servlet;import java.io.IOException; import java.io.PrintWriter;import javax.servlet.ServletConfig; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;public class Config extends HttpServlet {/** * */ private static final long serialVersionUID = 1L;@Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { this.doPost(req, resp); }@Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { resp.setContentType("text/html;charset=utf-8"); ServletConfig config = getServletConfig(); String name = config.getInitParameter("name"); String age = config.getInitParameter("age"); PrintWriter out = resp.getWriter(); out.println(name+"今年"+age+"歲！"); } }

　　

轉(zhuǎn)載于:https://www.cnblogs.com/wengzhongqin/archive/2012/02/29/2374607.html

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