java web Servlet HTML 登陆，用连接sqlserver数据库的名字和密码登录遇到的问题

package com.servlet.test1;



import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;



import java.sql.*;

/**

 * Servlet implementation class LoginServlet

 */

public class LoginServlet extends HttpServlet {

	private static final long serialVersionUID = 1L;



	/**

	 * @see HttpServlet#HttpServlet()

	 */

	static{

		try {

			Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");  

			System.out.println("数据库驱动程序加载成功");

		} catch (Exception e) {

			e.printStackTrace(); 

			System.out.println("数据库驱动程序加载失败");

		}

	}



	public LoginServlet() {

		super();

	}



	/**

	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)

	 */

	protected void doGet(HttpServletRequest request, HttpServletResponse response)

			throws ServletException, IOException {

		doPost(request, response);



	}



	/**

	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)

	 */

	protected void doPost(HttpServletRequest request, HttpServletResponse response)

			throws ServletException, IOException {

		doGet(request, response);

		request.setCharacterEncoding("UTF-8");



		String username = request.getParameter("username");

		String password = request.getParameter("password");

		

		try {

			Connection conn = DriverManager.getConnection(

					"jdbc:sqlsServer://127.0.0.1:1433;DataName=UserInfo","sa","hulang");

			PreparedStatement ps = conn.prepareStatement(

					"select count(*) from Table_1 where username=?");

			//这个用户名是用户输入的

			ps.setString(1, username);

			ResultSet rs = ps.executeQuery();

			while(rs.next()){

				//这个密码是数据库里面存的密码，然后你拿这个和输入的对比就可以了

				

				String password1 = rs.getString("password");

			}

			System.out.println("数据库连接成功!");

		} catch (Exception e) {

			e.printStackTrace();

			System.out.println("数据库连接失败！");

		}

	}

}