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04-Session-基本使用

发布时间：2024-12-05 21:10:51编辑：雪饮阅读（）

Session比cookie强大一些，存储于服务器端。
Session的存储设置实现如：
package com.session;

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("/SessionServlet01")
public class SessionServlet01 extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        HttpSession session= req.getSession();
        //session的setAttribute不仅仅可以设置纯字符串，还可以设置Object类型
        session.setAttribute("username","kasumi");
        req.getRequestDispatcher("/SessionServlet02").forward(req,resp);
    }
}
然后获取session如：
package com.session;

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("/SessionServlet02")
public class SessionServlet02 extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        HttpSession session= req.getSession();
        Object username=session.getAttribute("username");
        System.out.println("username:"+username);
    }
}