【JSP开发】获取web应用的初始化参数

<init-param>
  <param-name>data</param-name>
  <param-value>XXXXX</param-value>
  </init-param>
  
  <init-param>
  <param-name>data1</param-name>
  <param-value>YYYYY</param-value>
  </init-param>
  
  <init-param>
  <param-name>data2</param-name>
  <param-value>ZZZZZ</param-value>
  </init-param>

package cn.edu;


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


//获取Web应用的初始化参数
public class ServletDemo7 extends HttpServlet {




	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
     
		//单个输出全局初始化参数
		String num=this.getServletContext().getInitParameter("data");
		System.out.println(num);
		
		//输出多个全局初始化参数
		Enumeration e = this.getServletContext().getInitParameterNames();
		while(e.hasMoreElements()){
			String name=(String)e.nextElement();
			String value1=this.getServletConfig().getInitParameter(name);
			System.out.println(name+" = "+value1);
		}
	
	}




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


}