在ServletConfig和ServletContext都有getInitParameter方法， 这两个方法的都能从web.xml中获取参数，但是是有区别的。
1.web.xml代码
<?xml version="1.0" encoding="UTF-8"?> <web-app id="WebApp_ID" 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"> <context-param> <param-name>webParam</param-name> <param-value>aaa</param-value> </context-param> <servlet> <servlet-name>test</servlet-name> <servlet-class>Test</servlet-class> <init-param> <param-name>servletParam</param-name> <param-value>bbb</param-value> </init-param> </servlet> <servlet-mapping> <servlet-name>test</servlet-name> <url-pattern>/test</url-pattern> </servlet-mapping> </web-app> 注：区分配置文件中，对参数的配置的不同. servletParam这个参数是属于Test这个Servlet的; 而webParam这个参数是属于web应用的，被各个servlet共享。
2.调用代码
public class Test extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html"); PrintWriter out = response.getWriter(); String s1 = this.getInitParameter("servletParam"); String s2 = this.getServletContext().getInitParameter("webParam"); //注意区别，一个是独属于Test这个Servlet的参数，一个是web范围的参数， out.println("<HTML>"); out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>"); out.println(" <BODY>"); out.println(s1); out.println(s2); out.println(" </BODY>"); out.println("</HTML>"); out.flush(); out.close(); } } 3.运行结果 bbb aaa 本文转载，原文链接： http://momoxiaoxiong.iteye.com/blog/1214238