會話技術_Session_快速入門

目錄

1.概念：

2.快速入門：

3.Session的原理分析

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Session:

1.概念：

        服務器端會話技術，在一次會話中的多次請求間共享數據，將數據保存在服務器端的對象中。HttpSession

2.快速入門：

        ①獲取HttpSession對象：

             HttpSession session = request.getSession();

        ②使用HttpSession對象：

            Object getAttribute(String name)

            void setAttribute(String name,Object value)

            void removeAttribute(String name)

 

package jason.lh.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("/SessionDemo1")
public class SessionDemo1 extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            //使用session共享數據

        //①獲取session
        HttpSession session = request.getSession();

        //②存儲數據
       session.setAttribute("jason","hello session");

    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }
}

 

package jason.lh.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("/SessionDemo2")
public class SessionDemo2 extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //使用|session獲取數據

        //①獲取session
        HttpSession session = request.getSession();

        //②獲取數據
        Object jason = session.getAttribute("jason");
        System.out.println(jason);
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }
}

 

 

 

3.Session的原理分析

Session的實現是依賴於Cookie的