Context域从web.xml获取数据学习笔记

web.xml配置文件

  
      email
      [email protected]
  
    
      tel
      13888888888888
   

java文件

import java.io.IOException;
import java.io.PrintWriter;

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 webDme extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        //取得对象
         ServletContext context = this.getServletContext();
         //从web.xml获取元素
        String email =  context.getInitParameter("email");
        String tel =  context.getInitParameter("tel");

        if(email != null && tel != null)
        {
        //如果是中文需要加上这个，否则出现乱码
            response.setContentType("text/html;charset=UTF-8");
            response.getWriter().write("李玟邮箱："+email+"
");
            response.getWriter().write("李玟电话："+tel+"
");
        }

    }

}

访问路径

http://localhost:8080/day04/webDme