package electric.electricUtils;import java.sql.*;import java.io.*;import java.util.*;public class DbConnectionManager {  private static String propFileName = FinalConstants.PATH_DBPROP;  private static Properties prop = new Properties();  private static String dbClassName =      "com.microsoft.jdbc.sqlserver.SQLServerDriver";  private static String dbUrl =      "jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=YWW";  private static String dbUsr = "sa";  private static String dbPwd = "";  private static void loadProperty() {    try {      prop.load(new FileInputStream(propFileName));      dbClassName = prop.getProperty("DB_CLASS_NAME");      dbUrl = prop.getProperty("DB_URL",          "jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=YWW");      dbUsr = prop.getProperty("DB_USR", "sa");      dbPwd = prop.getProperty("DB_PWD", "");    }    catch (Exception e) {      e.printStackTrace();    }  }  public static Connection getConnection() {    Connection con = null;   loadProperty();    try {      Class.forName(dbClassName).newInstance();      con = DriverManager.getConnection(dbUrl, dbUsr, dbPwd);    }    catch (Exception ee) {      ee.printStackTrace();    }   if (con == null) {      System.err.println(          "警告: DbConnectionManager.getConnection() 獲得數據庫鏈接失敗.\r\n\r\n鏈接類型:" +          dbClassName + "\r\n鏈接位置:" + dbUrl + "\r\n用戶/密碼" + dbUsr + "/" + dbPwd);    }    return con;  }/*  public static void main(String[] args) {    Connection conn = getConnection();    System.out.println(conn.toString());    try {      conn.close();      conn = null;    }    catch (Exception e) {    }  }      */ }