简单Web界面开发(数据库)

 

(1)首先配置好eclipse 和 SQL server 2016 的环境,下载sqljdbc4.jar。(我的eclipse是eclipse Neon )

(2)创建新的数据库

(3)创建java project ,测试是否可以成功连接数据库

package pkg;

import java.sql.*;

public class Main {
 public static void main(String [] args)
 {
	  String driverName="com.microsoft.sqlserver.jdbc.SQLServerDriver";
	  String dbURL="jdbc:sqlserver://127.0.0.1:1433;DatabaseName=哈哈";
	  String userName="sa";
	  String userPwd="123456";
	 try
	{
		Class.forName(driverName);
		System.out.println("加载驱动成功!");
	}catch(Exception e){
		e.printStackTrace();
		System.out.println("加载驱动失败!");
	}
	try{
		Connection dbConn=DriverManager.getConnection(dbURL,userName,userPwd);
			System.out.println("连接数据库成功!");
	}catch(Exception e)
	{
		e.printStackTrace();
		System.out.print("SQL Server连接失败!");
	}
 }
 }

  

 

(4)测试成功后,创建Web project ,在WebContent 新建 JSP File 的登陆界面和连接数据库。

(5)登陆界面NewFile.jsp 中编辑代码

<%@ 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>
		<h2>登录界面</h2> 
		<form action="check.jsp" method="post">
		用户:<input type="text" name = "username"><br>
		密码:<input type="password" name="password"><br>
        <input type="submit" value="提交">
		</form>
</center>
</body>
</html>

 

 

 (6)连接数据库check.jsp,编辑代码如下

<%@ 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=哈哈";
	  String userName="sa";
	  String userPwd="123456";

	Class.forName(driverName);
	Connection dbConn=DriverManager.getConnection(dbURL,userName,userPwd);
	String sql = "select * from userinfo where [user]=? and [pwd]=?";
	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>

 

 注:1.<%    %> 可以输入 java 语言的代码

   2."select * from userinfo where [user]=? and [pwd]=?";格式是 "select * from 数据库表的名称 where [第一列名]=? and [第二个列名]=?";

   3.pstmt.setString(1, us);
      pstmt.setString(2, pass);

    其中 1 指第一个问号,2指第二个问号。

(7)在登陆界面中,在action后输入check.jsp。

(8)将下载好的sqljdbc4.jar添加到libz中,如图

(9)成功后如下:

 

 

posted @ 2017-02-23 17:24  发酸的丶米饭  阅读(932)  评论(0编辑  收藏  举报