Session

最新推荐文章于 2024-04-22 07:30:00 发布

乖乖的谋谋

最新推荐文章于 2024-04-22 07:30:00 发布

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分类专栏： JSP servlet 文章标签：服务器

本文链接：https://blog.youkuaiyun.com/qq_53943932/article/details/121060054

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创建session并存东西

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.io.PrintWriter;

public class SessionDemo01 extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //解决中文乱码
        req.setCharacterEncoding("utf-8");
        resp.setCharacterEncoding("utf-8");
        resp.setContentType("text/html;charset=utf-8");
        //得到session
        HttpSession session = req.getSession();

        //给session存东西
        session.setAttribute("name","小陆");

        //获取session的id
        String sessionId = session.getId();

        //判断session是不是新创建
        if (session.isNew()){
            resp.getWriter().write("session创建成功，id："+sessionId);
        }else {
            resp.getWriter().write("session已经在服务器中存在了，id："+sessionId);
        }


    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }
}

获得session中的数据

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

public class SessionDemo02 extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        //解决中文乱码
        req.setCharacterEncoding("utf-8");
        resp.setCharacterEncoding("utf-8");
        resp.setContentType("text/html;charset=utf-8");
      //得到session
        HttpSession session = req.getSession();
        String name = (String) session.getAttribute("name");  //取得name
        System.out.println(name);


        
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }
}