WebRoot/StudentChangePassword.jsp

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<%@ page contentType="text/html; charset=utf-8" language="java" import="java.sql.*,prj.db.*,java.util.*" errorPage="" %>
<%
    Class.forName(DbConfig.DriverName);
    Connection conn = DriverManager.getConnection(DbConfig.ConnString);
    Statement stmt = conn.createStatement();
    ResultSet rs = null;
    String sql = null;
    String msg = null;
    request.setCharacterEncoding("utf-8");

    Integer userId = (Integer) request.getSession().getAttribute("UserId");
    if (request.getParameter("Action") != null) {
        sql = "UPDATE [Student] SET [Password] = '" + request.getParameter("Password") + "' WHERE [Id]=" + userId;
        sql = sql.replace("'null'", "null");

        stmt.executeUpdate(sql);
        msg = "操作成功！";
    }
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
        <meta http-equiv="pragma" content="no-cache">
        <meta http-equiv="cache-control" content="no-cache">
        <meta http-equiv="expires" content="0">
        <style>td { font-size: 12px; }</style>
    </head>
    <body>

        <table border="1" cellSpacing="0" borderColorLight="#145aa0" borderColorDark="#9cc7ef" cellPadding="4" width="100%" align="center">
            <tr bgColor="#4296e7">
                <td colSpan="2"><div align="center"><font color="#ffffff">修改密码</font></div></td>
            </tr>
            <tr>
                <td><br />
                    <%
                    sql = "SELECT [Student].*  FROM [Student] WHERE [Student].[Id]="+userId;

                    rs = stmt.executeQuery(sql);
                    if(rs.next()){
                    %>
                    <div><form action="" method="post">
                            <input type="hidden" name="Action" value="insert" />
                            <input type="hidden" name="id" value="<%=rs.getObject("Id")%>" />

                            <table style="border-width: 1px; border-style: solid; width: 100%; height: 50px; border-collapse: collapse;"
                                   border="1" rules="all" cellSpacing="0" cellPadding="4">
                                <tr style="width: 79%;">
                                    <td style="width: 164px;" align="right">名称</td>
                                    <td><input id="Name" name="Name" type="text" value="<%=rs.getObject("Name")%>" readonly="readonly"></td>
                                </tr>
                                <tr style="width: 79%;">
                                    <td style="width: 164px;" align="right">密码</td>
                                    <td><input id="Password" name="Password" type="text" value="<%=rs.getObject("Password")%>"></td>
                                </tr>
                                <tr style="width: 79%;" align="center">
                                    <td colSpan="2">
                                        <input type="submit" value="保存" />
                                    </td>
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