JavaWeb——Session的前后端交互（简洁代码）

JAVA程序代码：

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;
import java.io.IOException;

@WebServlet("/sessionDemo")
public class SessionDemo extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException  {
        //使用session共享数据
        //1.获取session
        HttpSession session = request.getSession();
        //2.存储数据
        session.setAttribute("msg","木心小白菜！");
    }
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }
}

JS程序代码：

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>标题</title>
</head>
<body>
    <h1><%=request.getSession().getAttribute("msg")%>,欢迎您</h1>
</body>
</html>