問題：
I want to connect Java class file with SQL server 2012. I have logged in with SQL server authentication, but I am receiving an error when connecting.我想將 Java 類文件與 SQL Server 2012 連接。我已使用 SQL Server 身份驗證登錄，但在連接時收到錯誤消息。
Error:錯誤：
The TCP/IP connection to the host 127.0.0.1, port 1433 has failed.與主機 127.0.0.1、端口 1433 的 TCP/IP 連接失敗。 Error: "Connection refused: connect. Verify the connection properties. Make sure that an instance of SQL Server is running on the host and accepting TCP/IP connections at the port. Make sure that TCP connections to the port are not blocked by a firewall.".錯誤：“連接被拒絕：連接。驗證連接屬性。確保 SQL Server 實例正在主機上運行並在端口接受 TCP/IP 連接。確保到端口的 TCP 連接未被防火牆阻止.”。
My code:我的代碼：
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver"); //1. Register your driver
//2. get the connection object
//Connection con = DriverManager.getConnection("jdbc:sqlserver://localhost;databaseName=aysha","sa","admin");
Connection con = DriverManager.getConnection("jdbc:sqlserver://127.0.0.1;databaseName=aysha","user=sa","password=admin");
//"jdbc:sqlserver://127.0.0.1:1433; Instance=SQL2008;" + "databaseName=MB;user=sa;password=123;";
//Connection con = DriverManager.getConnection("jdbc:sqlserver://localhost:1433;databaseName=aysha","sa" , "password");
//3. Prepare a statement
Statement stmt = con.createStatement();
//4. Write the query`
String sql = "Select * from employee";
//5. Execute the statement and
ResultSet rs = stmt.executeQuery(sql);
//6. Process the result set
while (rs.next())
{
System.out.println(rs.getInt(1));
}