sqlserver 和java连接不上

package museummanagementsystem;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class ConnectDb {
static PreparedStatement ps = null; //声明PreparedStatement对象
static ResultSet res = null; //声明ResultSet对象

public static Connection getConnection() throws ClassNotFoundException, SQLException {
    
    Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
        
    Connection con = DriverManager.getConnection("jdbc:sqlserver://localhost:1433;DatabaseName=manger"
                    +";DatabaseName=manger","sa","123");//**处为数据库登录账号和密码
    System.out.println("连接成功");
    
    return con;
    
}

public static PreparedStatement preparedStatement(Connection con, String sql) {
    PreparedStatement ps = null;     //声明PreparedStatement对象
    try {
        //执行sql语句的数据库操作
        ps = con.prepareStatement(sql);
    } catch (SQLException e) {
        e.printStackTrace();
    }
    return ps;
}

public static void main(String[] args) {
    try {
        Connection con=getConnection();
        String str = "select * from art; " ;
        ps = con.prepareStatement(str);
        res = ps.executeQuery();
        while (res.next()) {
            System.out.println(res.getString("art_name").trim()+'\t');
            //System.out.println(rs.getString("art_name").trim()+'\t');
            //System.out.println(rs.getString("creator_name").trim()+'\t');
            //System.out.println(rs.getString("intime").trim()+'\t');
            //System.out.println(rs.getString("type").trim()+'\n');
        }
    } catch (ClassNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (SQLException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

}