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  • 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

    用户名:
    密   码:

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    <!DOCTYPE html>
    <html>
    <head>
    <meta charset="UTF-8">
    <title>Session保存用户名</title>
    </head>
    <body>
     
    <form action="doS3" method= "post">
        用户名:<input type="text" name="name"/><br/>
        密   码:<input type="password" name = "pwd"><br/>
        <input type="submit">
    </form>
     
    </body>
    </html>

    　　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<br>");
                    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);
        }
    }

    　　
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  • 原文地址：https://www.cnblogs.com/jpfss/p/9081806.html
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