使用java servlet将数据从数据库发送到jsp

【问题标题】：Send data from database to jsp using javaservlet使用java servlet将数据从数据库发送到jsp
【发布时间】：2017-03-01 01:46:46
【问题描述】：

这是我第一次尝试这种应用程序我有一个jsp文件

<html>
<head>
<title>Flight booking</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet"
    href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">

<link rel="stylesheet" href="css/style.css" type="text/css"
    media="screen">`enter code here`
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Welcome <%=session.getAttribute("fname")%> !
</title>
</head>
<body>
    <div class="container">
        <div class="panel panel-default">
            <div class="panel body" id="inner_panel_1">
                <h4>
                    Welcome ,
                    <%=session.getAttribute("fname")%></h4>
            </div>
            <!--end panel 1 -->

            <div class="panel body" id="inner_panel_2">
             <form action="CustomerServlet" method="post">
              <label for="viewClientInfo">View/Change
                    Client Information</label>
                <input type="submit" name="viewClientInfo" id="viewClientInfo" class="btn btn-success"
                    data-toggle="collapse" data-target="#clientPanel">
            </form>

            <!-- end panel body -->
            <div id="clientPanel" class="collapse">

                <div
                    class="col-xs-12 col-sm-12 col-md-6 col-lg-6 col-xs-offset-0 col-sm-offset-0 col-md-offset-3 col-lg-offset-3 toppad">


                    <div class="panel panel-info">
                        <div class="panel-heading">
                            <h3 class="panel-title"></h3>

                                <td> <%=session.getAttribute("fname")%> </td>
                                <td> <%=session.getAttribute("lname")%> </td>

                        </div>
                        <div class="panel-body">
                            <div class="row">
                                <div class="col-md-3 col-lg-3 " align="center">
                                    <img alt="User Pic"
                                        src="http://icons.iconarchive.com/icons/icons8/windows-8/128/Transport-Airplane-Takeoff-icon.png"
                                        class="img-circle img-responsive">
                                </div>

                                <div class=" col-md-9 col-lg-9 ">
                                    <table class="table table-user-information">
                                        <tbody>
                                            <tr>
                                                <td>First Name :</td>
                                                <td><%=session.getAttribute("firstname")%></td>
                                            </tr>
                                            <tr>
                                                <td>Last Name :</td>
                                                <td><%=session.getAttribute("lastname")%></td>
                                            </tr>
                                            <tr>
                                                <td>Apt Number:</td>
                                                <td><%=session.getAttribute("aptNumber")%></td>
                                            </tr>
                                            <tr>
                                                <td>Address</td>
                                                <td><%=session.getAttribute("streetNum")%> <%=session.getAttribute("streetName")%>
                                                </td>
                                            </tr>
                                            <tr>
                                                <td>City, Country</td>
                                                <td><%=session.getAttribute("city")%>, <%=session.getAttribute("country")%>
                                                </td>
                                            </tr>
                                            <tr>
                                                <td>Email</td>
                                                <td><%=session.getAttribute("userEmail")%></td>
                                            </tr>
                                            <tr>
                                            <td>Phone Number</td>
                                            <td><%=session.getAttribute("phoneNum")%><br></td>

                                            </tr>

                                        </tbody>
                                    </table>

                                    <button type="button" class="btn btn-success" id="changePayment" data-toggle="collapse" data-target="#payment-panel">Change Payment Information</button> 
                                </div>
                            </div>
                        </div>
                    </div>
                </div>
                <!--end panel 2 -->
         </div>

            <div id="payment-panel" class="collapse">
                <div class="col-xs-12 col-md-4">
            <div class="panel panel-default">
                <div class="panel-heading">
                    <h3 class="panel-title">
                        Payment Details
                    </h3>
                </div>
                <div class="panel-body">
                    <form role="form"  class="creditCard" action="CreditCardServlet" method="addCreditCard">
                    <div class="form-group">
                        <label for="cardNumber">
                            CARD NUMBER</label>
                        <div class="input-group">
                            <input type="text" class="form-control" id="cardNumber" placeholder="Valid Card Number"
                                required autofocus />
                            <span class="input-group-addon"><span class="glyphicon glyphicon-lock"></span></span>
                        </div>
                    </div>
                    <div class="row">
                        <div class="col-xs-7 col-md-7">
                            <div class="form-group">
                                <label for="expiry">
                                    EXPIRY DATE</label>
                                <div class="col-xs-6 col-lg-6 pl-ziro">
                                    <input type="text" class="form-control" id="expiry" placeholder="MM/YYYY" required />
                                </div>
                            </div>
                        </div>
                        <div class="col-xs-5 col-md-5 pull-right">
                            <div class="form-group">
                                <label for="cvv">
                                    CV CODE</label>
                                <input type="password" class="form-control" id="cvv" placeholder="CV" required />
                            </div>
                        </div>
                    </div>
                    </form>
                    <div  class="col-md-4 text-center">
                   <button type="button" class="btn btn-success" id="submitPaymentInfo" >Submit</button> 

                   </div>

                </div>
            </div>
            </div>
            </div>
            </div>
            <!-- end inner panel -->
            <div class="panel body" id="inner_panel_3">
                <button type="button" class="btn btn-success" id="viewBookings" data-toggle="collapse" data-target="#client-bookings-panel">View
                    Bookings</button>

            </div>

            <div id="client-bookings-panel" class="collapse">
                <p>Client Bookings Dump for next Version</p>
            </div>
            <!--end panel 3 -->

            <div class="panel body" id="inner_panel_4">
                <button type="button" class="btn btn-success" id="bookFlightButton"  data-toggle="collapse" data-target="#flight-booker-panel">Book
                    Flight for Next Version</button>

            </div>

            <div id="flight-booker-panel" class="collapse">Link to Flight Booker</div>
            <!--end panel 4 -->

        </div>
    </div>
    <!--end container -->

</body>
<script
    src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<script
    src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</html>

我正在尝试获取刚刚从数据库登录的用户的信息，并使用上面的 jsp 将其显示给他们

public class UserInfoServlet {

    public void doGet(HttpServletRequest request , HttpServletResponse response)throws ServletException{


    }
}

我知道如何从 jsp 获取信息到 java 并将其保存到 db 但我不知道如何去相反的方向

【问题讨论】：

  • 所以你知道如何连接到数据库并从数据库中检索信息？
  • 我知道如何连接到 db 我只是不知道从 db 获取信息后如何将这些信息分配给正确的 jsp 占位符

标签： java database jsp servlets


【解决方案1】：

您需要连接到 db，然后在会话中设置信息，如下所示：

public class DatabaseAccess extends HttpServlet{

public void doGet(HttpServletRequest request,
                HttpServletResponse response)
        throws ServletException, IOException
{
  //you can use your own connection thing in you don't like the below code
  static final String JDBC_DRIVER="com.mysql.jdbc.Driver";  
  static final String DB_URL="jdbc:mysql://localhost/TEST";


  static final String USER = "root";
  static final String PASS = "password";

  try{

     Class.forName("com.mysql.jdbc.Driver");


     Connection conn = DriverManager.getConnection(DB_URL, USER, PASS);

     // Execute SQL query
     Statement stmt = conn.createStatement();
     String sql;
     sql = "YOUR QUERY. YOU SAID YOU ALREADY KNOW THIS";
     ResultSet rs = stmt.executeQuery(sql);

     // Extract data from result set
     while(rs.next()){
        //Retrieve by column name
        String fname = rs.getString("first");
        String flast = rs.getString("last");
     }

     rs.close();
     stmt.close();
     conn.close();
  }catch(SQLException se){        
     se.printStackTrace();
  }catch(Exception e){
     e.printStackTrace();
  }finally{        
     try{
        if(stmt!=null)
           stmt.close();
     }catch(SQLException se2){
     }
     try{
        if(conn!=null)
        conn.close();
     }catch(SQLException se){
        se.printStackTrace();
     }
  } 

//get the session and set the values
HttpSession session = request.getSession();    
session.setAttribute("fname", fname);
RequestDispatcher rd=req.getRequestDispatcher("/whateveristhejspname.jsp");
rd.forward(req, resp);

 }
}

确保您在 web.xml 文件中正确设置了映射

 <servlet>
 <servlet-name>DatabaseAccess</servlet-name>
 <servlet-class>DatabaseAccess</servlet-class>
 </servlet>

 <servlet-mapping>
 <servlet-name>DatabaseAccess</servlet-name>
 <url-pattern>/DatabaseAccess</url-pattern>
 </servlet-mapping>

【讨论】：

  • 在查看示例后感谢大家的帮助，我能够通过一些更改解决问题
【解决方案2】： 
public void doGet(HttpServletRequest request , HttpServletResponse response)throws ServletException {
    HttpSession session = request.getSession();
    //todo getSomeThing from DB
    session.setAttribute("userInfo","yourMessage");
    response.sendRedirect("your Page Location");
}

也许你想要这个

【讨论】：

    猜你喜欢
    • 2013-05-27
    • 2014-07-21
    • 1970-01-01
    • 1970-01-01
    • 2015-01-23
    • 2013-08-13
    • 2019-01-07
    • 1970-01-01
    • 1970-01-01
    相关资源
    最近更新 更多
    热门标签
    Java Python linux javascript Mysql C# Docker 算法 前端 SpringBoot Redis Vue spring 设计模式 .net core .net kubernetes c++ 数据库 数据结构 大数据 js 机器学习 微服务 Android Go 程序员 面试 JVM ASP.net core 云原生 人工智能 后端 PHP git CSS golang k8s Nginx Django mybatis 深度学习 多线程 React 架构 devops 爬虫 云计算 Spring Boot LeetCode