不关闭客户端,关闭服务器端后再启动服务器端,两次获取的session是同一个吗?

​ 情景描述:情况大概是这样的,在一个JSP页面中,通过表单提交数据给AServlet处理,该Servlet需要从表单中获取数据,并存入session中,如果在此时,把服务器端正常关闭,然后重新启动服务器端,那么这一次获得session和上一次是同一个session吗,第一次表单中获取到的数据还会保存吗?

​ 需要写一个简单JSP页面【以A.jsp为例】和一个简单的Servlet【SomeServlet.java为例】。代码如下:

A.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
	<form action="SomeServlet" method="post">
		姓名:<input type="text" value="" name="name">
		<input type="submit" value="提交">
	</form>
</body>
</html>

SomeServlet.java

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

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

/**
 * Servlet implementation class SomeServlet
 */
@WebServlet("/SomeServlet")
public class SomeServlet extends HttpServlet {
	


	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public SomeServlet() {
        super();
        // TODO Auto-generated constructor stub
    }
    @Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		// TODO Auto-generated method stub
		doPost(req,resp);
	}
    
	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		response.setCharacterEncoding("UTF-8");
		request.setCharacterEncoding("UTF-8");
		
		String username=request.getParameter("name");
		//String username="hello test!";
		HttpSession session=request.getSession();
		session.setAttribute("username", username);
		PrintWriter out=response.getWriter();
		out.println("SomeServlet Session: "+ session);
		out.println("SomeServelt username: "+ username);
	}

}

结果:

​ 1.输入->提交
在这里插入图片描述
​ 2.跳转到SomeServlet
在这里插入图片描述
​ 3.关闭服务器在这里插入图片描述
4.重启服务器
5.刷新客户端的页面
在这里插入图片描述
6.可以非常明显的看到两次的session不是同一个,但是获取到的表单值是一样的。

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