java web getInitParameter方法

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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

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