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web.xml上下文初始化参数
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1、在web.xml文件中配置上下文参数
<!--<context-param>标签声明上下文初始化参数， -->
<!-- 上下文初始化的参数可以被应用程序用所有servlet共享 -->
<context-param>
<!-- 上下文参数可以像map一样使用 -->
<param-name>One</param-name><!-- 参数名 -->
<param-value>hello</param-value><!-- 参数值 -->
</context-param>
<context-param>
<param-name>Two</param-name>
<param-value>dyf</param-value>
</context-param>
2、在servlet中获取上下文参数
//@WebServlet(name="HelloServlet01",value="/Hello")
@WebServlet(name="HelloServlet01",urlPatterns="/Hello")
public class HelloServlet01 extends HttpServlet {
private static final long serialVersionUID = 1L; public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
this.doPost(request, response); } public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//创建一个获取上下文参数的对象
ServletContext context = this.getServletContext();
//获取上下文初始化的参数
String initParameter = context.getInitParameter("One");
// context.getInitParameterNames();
PrintWriter writer = response.getWriter();
//将参数返回到页面
writer.append(initParameter);
}
}
