简单的web小程序

首先我们先编写一个jsp表面的程序，

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
    <title>登录界面</title>
</head>
<body>
<center>
    <font color="BLUE">登录界面</font>  
    <form action="NewFile1.jsp" method="post">
    用户：<input type="text" name = "username"><br>
    密码：<input type="password" name="pass"><br>
    <input type="submit" value="提交">
</form></center>
</body>
</html>

这就是最开始的界面。

这时我们要确定数据库链接了eclipse所以要编写一个java代码

package pkg;

import java.sql.Connection;
import java.sql.DriverManager;

public class Main {

 public static void main(String [] args)

 {

  String driverName="com.microsoft.sqlserver.jdbc.SQLServerDriver";

  String dbURL="jdbc:sqlserver://localhost:1433;DatabaseName=Text";

  String userName="sa";

  String userPwd="20153121";

  try

  {

   Class.forName(driverName);

   Connection ConnectiondbConn = DriverManager.getConnection(dbURL,userName,userPwd);

    System.out.println("连接数据库成功");

  }

  catch(Exception e)

  {

   e.printStackTrace();

   System.out.print("连接失败");

  }    

 }

}

　　运行这行代码就可以知道我们的程序是否连接着数据库。

然后我们要在数据库里创建一个表格，用这个表格来进行存储数据。

 

 

 

然后我们要新建一个jsp文件，来来从数据库中搜索输入的数据

<%@ page language="java" import="java.sql.*" import="java.util.*" contentType="text/html;; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>登录</title>
</head>
<body>
    <%
    String driverName="com.microsoft.sqlserver.jdbc.SQLServerDriver";

    String dbURL="jdbc:sqlserver://localhost:1433;DatabaseName=Text";

    String userName="sa";

    String userPwd="20153121";
 
    Class.forName(driverName);
    Connection dbConn=DriverManager.getConnection(dbURL,userName,userPwd);
    String sql = "select * from Table_1  where [name]=? and [password]=?";
    PreparedStatement pstmt = dbConn.prepareStatement(sql);
    request.setCharacterEncoding("UTF-8");
    String us = request.getParameter("username");
    String pass = request.getParameter("password");
    pstmt.setString(1, us);
    pstmt.setString(2, pass);
    ResultSet rs = pstmt.executeQuery();
    if(rs.next()) {
        %><center><h1>登陆成功！</h1></center><%
    }
    else
    {
        %><center><h1>登陆失败！</h1></center><%
    }
     
    %>
</body>
<ml>

这样就可以完成i个最基本的带有数据库的程序的编写

posted @ 2017-02-23 22:29  -QV-  阅读(184)  评论(0)    收藏  举报