向ServletContext中保存和获取数据

AServlet

package cn.ttt.servlet;

import java.io.IOException;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
 * 演示向ServletContext中保存数据
 * @author xiaoru
 *
 */
@WebServlet("/AServlet")
public class AServlet extends HttpServlet {
	
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		/*
		 * 1.获取ServletContext对象
		 * 2.调用其setAttribute() 方法保存数据
		 */
		ServletContext application = this.getServletContext();
		application.setAttribute("name", "张三");
		
	}

}

BServlet

package cn.ttt.servlet;

import java.io.IOException;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * 演示从ServletContext中获取数据
 */
@WebServlet("/BServlet")
public class BServlet extends HttpServlet {
	
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		/*
		 * 1.获取ServletContext对象
		 * 2.调用getAttribute() 方法完成获取数据
		 */
		ServletContext application = this.getServletContext();
		String name = (String)application.getAttribute("name");
		System.out.println(name);
	}

}