com.microsoft.sqlserver.jdbc.SQLServerException: 通过端口 1433

import java.sql.Connection;import java.sql.DriverManager;import java.sql.ResultSet;import java.sql.SQLException;import java.sql.Statement;public class TestJDBC {    /**     * @param args     */    /**jdbc:sqlserver://localhost:1433;databaseName=bbsDB;user=Lenovo;password=123456"     * @param args     */    public static void main(String[] args)  {        Connection con=null;        Statement stmt=null;        ResultSet rs=null;        try{            //jdbc:sqlserver://localhost:1433;databaseName=bbsDB;user=Lenovo;password=123456            //jdbc:sqlserver://localhost;user=MyUserName;password=*****;            Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");            con=DriverManager.getConnection("jdbc:sqlserver://localhost;user=Lenovo;password=123456");            stmt=con.createStatement();            rs=stmt.executeQuery("Select * from bbsUsers ");            while(rs.next()){                //得到内容                             rs.getString("UserName");            }        }catch(ClassNotFoundException e){            e.printStackTrace();        }catch(SQLException e){            e.printStackTrace();        }        finally{            try{                if(con!=null){                    con.close();                    con=null;                }                if(stmt!=null){                    stmt.close();                    stmt=null;                }                if(rs!=null){                    rs.close();                    rs=null;                }            }catch(SQLException e){                e.printStackTrace();            }        }    }}

com.microsoft.sqlserver.jdbc.SQLServerException: 通过端口 1433 连接到主机 localhost 的 TCP/IP 连接失败。错误:“Connection refused: connect。请验证连接属性，并检查 SQL Server 的实例正在主机上运行，且在此端口接受 TCP/IP 连接，还要确保防火墙没有阻止到此端口的 TCP 连接。”。    at com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDriverError(SQLServerException.java:171)    at com.microsoft.sqlserver.jdbc.SQLServerConnection.connectHelper(SQLServerConnection.java:1033)    at com.microsoft.sqlserver.jdbc.SQLServerConnection.login(SQLServerConnection.java:817)    at com.microsoft.sqlserver.jdbc.SQLServerConnection.connect(SQLServerConnection.java:700)    at com.microsoft.sqlserver.jdbc.SQLServerDriver.connect(SQLServerDriver.java:842)    at java.sql.DriverManager.getConnection(DriverManager.java:582)    at java.sql.DriverManager.getConnection(DriverManager.java:207)    at TestJDBC.main(TestJDBC.java:24)