本人用eclipse开发，jdbc驱动装好，请问还要怎么配置连接SQL SERVER？

本人用eclipse开发，jdbc驱动装好，请问还要怎么配置连接SQL SERVER？

写一个DB类进行连接。

package db;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;


public class DB {

private Connection conn;


public Connection openConn() throws SQLException, ClassNotFoundException {
if (this.conn == null || this.conn.isClosed()) {
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
this.conn = DriverManager.getConnection(
"jdbc:sqlserver://localhost:1433;databaseName=数据库名",
"数据库用户名", "该用户的密码"); //localhost
}
return this.conn;
}


public void closeConn() {
try {
if ((this.conn != null) && (!this.conn.isClosed()))
this.conn.close();
} catch (SQLException e) {
e.printStackTrace();
} finally {
this.conn = null;
}
}
}

然后在其它需要使用数据库的地方这样调用：

private DB db;

public DB getDb() {
return db;
}

public void setDb(DB db) {
this.db = db;
}

public int countGoodsByTypeId(Object typeId) throws SQLException,
ClassNotFoundException {
String sql = "SELECt COUNT(*) AS count FROM Goods WHERe GTID=?"; //SQL 语句
Connection conn = db.openConn();
PreparedStatement pstat = conn.prepareCall(sql);
pstat.setObject(1, typeId);
ResultSet rs = pstat.executeQuery();
rs.next();
return rs.getInt("count");
}
以上加粗的地方是需要修改的地方，其他地方根据情况进行修改。
如果不明白请追问。