给当前web项目配置内容

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* 配置文件的位置：web.xml
           * 配置内容
               <context-param>
                   <param-name>username</param-name>
                   <param-value>root</param-value>

</context-param>

小例子

web.xml

<context-param><param-name>driver</param-name><param-value>com.mysql.jdbc.Dirver</param-value></context-param><context-param><param-name>url</param-name><param-value>jdbc:mysql://localhost:3306/test</param-value></context-param><context-param><param-name>username</param-name><param-value>root</param-value></context-param><context-param><param-name>password</param-name><param-value>123456</param-value></context-param><servlet>    <servlet-name>ReadParamServlet</servlet-name>    <servlet-class>reed.ReadParamServlet</servlet-class>  </servlet><servlet-mapping>    <servlet-name>ReadParamServlet</servlet-name>    <url-pattern>/readParamServlet</url-pattern>  </servlet-mapping>

import java.io.IOException;import java.util.Enumeration;import javax.servlet.ServletContext;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class ReadParamServlet extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {//在任意servlet中获取context的配置信息// * 获得ServletContext ServletContext sc = this.getServletContext();// * 获得所有的配置信息的名称   <context-param><param-name>Enumeration<String> names = sc.getInitParameterNames();// * 遍历while(names.hasMoreElements()){// * 获得每一个名称String name = names.nextElement();// * 获得指定名称的内容  <context-param><param-value>String value = sc.getInitParameter(name);System.out.println("context -->  " + name + " : " + value);}}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {}}

键入http://localhost:8080/ServletContext/readParamServlet

输出context --> username : root
context --> driver : com.mysql.jdbc.Dirver
context --> password : 123456
context --> url : jdbc:mysql://localhost:3306/test

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