Session保存用户名到Session域对象中

Session保存用户名到Session域对象中

Session保存用户名

 

1.构造登录界面

窗体顶端

用户名:
密   码:

 

窗体底端

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用户名:     密   码:

2.获取Session并将用户名保存到Session域对象中

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package com.oaec.session;   import java.io.IOException; import java.util.Date;   import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession;   public class servletDemo3 extends HttpServlet {     @Override     protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {         req.setCharacterEncoding("UTF-8");         resp.setContentType("text/html;charset=UTF-8");         // req.getAttribute(arg0)         String name = req.getParameter("name");         String pwd = req.getParameter("pwd");         if ("高圆圆".equals(name) && "123".equals(pwd)) {             // 将用户名保存在session中             // 1.获得session             HttpSession session = req.getSession();             // 2.将用户名保存在session中             session.setAttribute("uname", name);             resp.sendRedirect("doS4");           } else {             resp.sendRedirect("index.html");         }     }       @Override     protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {         doGet(req, resp);     } }

3.从Session中取出数据  并对页面进行保护  没有登录通过URL访问 直接重定向到登录界面  即主页

 

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package com.oaec.session;   import java.io.IOException; import java.io.PrintWriter; import java.util.Date;   import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession;   public class servletDemo4 extends HttpServlet{     @Override     protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {         req.setCharacterEncoding("UTF-8");         resp.setContentType("text/html;charset=UTF-8");         //从session中取出数据         HttpSession session = req.getSession(false);         Object object = null;         if (session != null && (object = session.getAttribute("uname"))!=null) {                        PrintWriter writer = resp.getWriter();                 writer.write("登录成功 ");                 writer.write("欢迎你"+object);             }else {                 //没有登录过 直接重定向到主页                 resp.sendRedirect("index.html");             }         }     @Override     protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {         doGet(req, resp);     } }