ServletContext两个Servlet传值学习笔记

原创

知止内明 2018-04-17 18:27:51 博主文章分类：编程java ©著作权

文章标签 Servlet Context Serv 文章分类 Java 后端开发

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ServletContext对象

1)在web应用中，由服务器创建的唯一的一个对象是ServletContext 2)ServletContext对象在每一个Servlet中取得都是相同到 3)ServletContext对象在存取方法：存ServletContext.setAttribute(String,Object):(返回值)void 取ServletContext.getAttribute(String):（返回值）Object

dome1

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 contDome1 extends HttpServlet {

	
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		//取得客户端的请求参数
		String nsername =   request.getParameter("username");
		//取得唯一的一个serverletContext对象
		 ServletContext context =  this.getServletContext();
		 
		 //将信息存入ServletContext对象
		 context.setAttribute("nsername", nsername);

	}



}

dome2

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 contDome2 extends HttpServlet {

	
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		
		
		//取得唯一的一个serverletContext对象
		 ServletContext context =  this.getServletContext();
		 
		 //根据name取得ServletContext对象中的值
		String username =  (String) context.getAttribute("nsername");
		
		//在浏览器输出
		response.setContentType("text/html;charset=UTF-8");
		response.getWriter().write("用户名：" + username + "<br/>");

	}

	

}