JSP和Servlet（不同用户权限修改信息）

来源：互联网发布：种姓制度知乎编辑：程序博客网时间：2024/06/01 09:58

1、程序的结构流程图：
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1、User.jsp(javabean)

package com.javabean;public class User {    private String username;    private String password;    private String quanxian;    public String getUsername() {        return username;    }    public void setUsername(String username) {        this.username = username;    }    public String getPassword() {        return password;    }    public void setPassword(String password) {        this.password = password;    }    public String getQuanxian() {        return quanxian;    }    public void setQuanxian(String quanxian) {        this.quanxian = quanxian;    }}

2、UserAdmin.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <base href="<%=basePath%>">    <title>My JSP 'MyJsp.jsp' starting page</title>    <meta http-equiv="pragma" content="no-cache">    <meta http-equiv="cache-control" content="no-cache">    <meta http-equiv="expires" content="0">        <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">    <meta http-equiv="description" content="This is my page">    <!--    <link rel="stylesheet" type="text/css" href="styles.css">    -->  </head>  <!-- 重点在下面的三元表达式 -->    <body>        <%String value = (String)request.getAttribute("quanxian"); %>    <form action="UserAdminServlet" method = "post">        username :<input type = "text" name = "username" value = "<%= (null == request.getAttribute("username"))? "" : request.getAttribute("username") %>"><br>        password :<input type = "password" name = "password"><br>        权限：<select name = "quanxian">        <!-- 获取的权限值收费符合 否则为空 -->                <option value = "commom" <%= "commom".equals(value) ? "selected" : "" %>>普通用户</option>                <option value = "admin" <%= "admin".equals(value) ? "selected" : "" %>>管理员</option>        </select><br>        <input type = "submit" value = "提交">    </form>  </body></html><%--//下面是重定向传来获得参数对比<form action="UserAdminServlet2" method = "post">        username :<input type = "text" name = "username" value = "<%= (null ==  request.getParameter("username"))? "" : request.getParameter("username") %>"><br>        password :<input type = "password" name = "password"><br>        权限：<select name = "quanxian">                <option value = "commom" <%= "commom".equals(request.getParameter("quanxian")) ? "selected" : "" %>>普通用户</option>                <option value = "admin" <%= "admin".equals(request.getParameter("quanxian")) ? "selected" : "" %>>管理员</option>        </select><br>        <input type = "submit" value = "提交">    </form>--%>

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3、UserAdminServlet

package com.servlet;import java.io.IOException;import java.io.PrintWriter;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 com.javabean.User;public class UserAdminServlet extends HttpServlet {    public void doPost(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        String username = request.getParameter("username");        String password = request.getParameter("password");        String quanxian = request.getParameter("quanxian");        //是否为普通用户？session/UserAdminSuccess.jsp ：session/UserAdmin.jsp；         if ("commom".equals(quanxian)) {            if ("commom".equals(username) && "commom".equals(password)) {                User user = new User();                user.setUsername(username);                user.setPassword(password);                user.setQuanxian(quanxian);                HttpSession session = request.getSession();                session.setAttribute("user", user);                request.getRequestDispatcher("session/UserAdminSuccess.jsp").forward(                        request, response);            } else {                request.setAttribute("username", username);                request.setAttribute("quanxian", quanxian);                //下面重定向是通过地址栏的方式传递参数                //response.sendRedirect("UserAdmin2.jsp?username="+username+"&quanxian="+quanxian+"");                request.getRequestDispatcher("session/UserAdmin.jsp").forward(request,                        response);            }            //是否为admin用户 ？ session/UserAdminSuccess.jsp ：session/UserAdmin.jsp；         } else if ("admin".equals(quanxian)) {            if ("admin".equals(username) && "admin".equals(password)) {                User user = new User();                user.setUsername(username);                user.setPassword(password);                user.setQuanxian(quanxian);                HttpSession session = request.getSession();                session.setAttribute("user", user);                //下面重定向是通过地址栏的方式传递参数                //response.sendRedirect("UserAdmin2.jsp?username="+username+"&quanxian="+quanxian+"");                request.getRequestDispatcher("session/UserAdminSuccess.jsp").forward(                        request, response);            } else {                request.setAttribute("username", username);                request.setAttribute("quanxian", quanxian);                request.getRequestDispatcher("session/UserAdmin.jsp").forward(request,                        response);            }        } else if ("".equals(username) || "".equals(password)) {            //下面重定向是通过地址栏的方式传递参数            //response.sendRedirect("UserAdmin2.jsp?username="+username+"&quanxian="+quanxian+"");            request.getRequestDispatcher("session/UserAdmin.jsp").forward(request,                    response);        }    }}/*public class UserAdminServlet2 extends HttpServlet {    public void doPost(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        String username = request.getParameter("username");        String password = request.getParameter("password");        String quanxian = request.getParameter("quanxian");        if ("commom".equals(quanxian)) {            if ("commom".equals(username) && "commom".equals(password)) {                User user = new User();                user.setUsername(username);                user.setPassword(password);                user.setQuanxian(quanxian);                HttpSession session = request.getSession();                session.setAttribute("commom", user);                request.getRequestDispatcher("UserAdminSuccess.jsp").forward(                        request, response);            } else {                response.sendRedirect("UserAdmin2.jsp?username="+username+"&quanxian="+quanxian+"");//              request.setAttribute("username", username);//              request.setAttribute("quanxian", quanxian);////              request.getRequestDispatcher("UserAdmin.jsp").forward(request,//                      response);            }        } else if ("admin".equals(quanxian)) {            if ("admin".equals(username) && "admin".equals(password)) {                User user = new User();                user.setUsername(username);                user.setPassword(password);                user.setQuanxian(quanxian);                HttpSession session = request.getSession();                session.setAttribute("commom", user);                request.getRequestDispatcher("UserAdminSuccess.jsp").forward(                        request, response);            } else {                response.sendRedirect("UserAdmin2.jsp?username="+username+"&quanxian="+quanxian+"");//              request.setAttribute("username", username);//              request.setAttribute("quanxian", quanxian);//              request.getRequestDispatcher("UserAdmin.jsp").forward(request,//                      response);            }        } else if ("".equals(username) || "".equals(password)) {            response.sendRedirect("UserAdmin2.jsp?username="+username+"&quanxian="+quanxian+"");//          request.getRequestDispatcher("UserAdmin.jsp").forward(request,//                  response);        }    }} *  *  */

4、UserAdminSuccess.jsp

 <body>        <%         User user = (User)session.getAttribute("user");        if(null == user){            response.sendRedirect("/Day08/session/UserAdmin.jsp");            return;        }        %>        <a href = "QueryServlet">Query</a><br>        <!-- 做个判断是否显示Update -->        <%             if(((User)session.getAttribute("user")).getQuanxian().equals("admin")){        %>        <a href = "UpdataServlet">Updata</a><br>        <% } %>  </body>

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5、UpdataServlet

package com.servlet;import java.io.IOException;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 com.javabean.User;public class UpdataServlet extends HttpServlet {    @Override    protected void doGet(HttpServletRequest req, HttpServletResponse resp)            throws ServletException, IOException {        HttpSession session = req.getSession();//      获取user的权限是否是admin？        if(null == session.getAttribute("user") || !(((User)session.getAttribute("user")).getQuanxian()).equals("admin")){            System.out.println("失败");        }else{            req.getRequestDispatcher("session/Updata.jsp").forward(req, resp);            System.out.println("成功");        }    }}

6、UpData.jsp

<body>  <%  User user = (User)session.getAttribute("user");  %>  <p>以前的session中的信息为：</p><br>  username = <%= user.getUsername() %><br>  password = <%= user.getPassword() %><br>    权限：<%= user.getQuanxian() %><br>    <p>请输入修改的信息：</p><br>    <form action="UpDataControl">    username : <input type = "text" name = "upDataUserName"><br>    password : <input type = "password" name = "upDataPassword"><br>    <input type = "submit" value = "更新数据">     </form>  </body>

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7、UPdataControl

package com.servlet;import java.io.IOException;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 com.javabean.User;public class UpDataControl extends HttpServlet {    @Override    protected void doGet(HttpServletRequest req, HttpServletResponse resp)            throws ServletException, IOException {        User upDataUser = new User();        upDataUser.setUsername(req.getParameter("upDataUserName"));        upDataUser.setPassword(req.getParameter("upDataPassword"));        HttpSession session = req.getSession();        session.setAttribute("user", upDataUser);        req.getRequestDispatcher("session/UpDataMessage.jsp").forward(req, resp);    }}

8、UpdataMessage.jsp

<body><%  User user = (User)session.getAttribute("user");  %>  <p>现在的session中的信息为：</p><br>  username = <%= user.getUsername() %><br>  password = <%= user.getPassword() %><br>  </body>

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