import java.sql.Connection;import java.sql.DriverManager;import java.sql.Statement;import java.sql.ResultSet;public class MyTest {  public static void main(String args[]) {    Connection con = null;    Statement st = null;    ResultSet rs = null;    try {      // 獲得MySQL驅動的實例      Class.forName("com.mysql.jdbc.Driver").newInstance();      // 獲得連接對象(提供：地址，用戶名，密碼)      con = DriverManager.getConnection("jdbc:mysql://127.0.0.1/Weather","root", "root");          if (!con.isClosed())        System.out.println("Successfully connected ");      else        System.out.println("failed connected");            //建立一個Statement，數據庫對象      st = con.createStatement();      // 運行SQL查詢語句      rs = st.executeQuery("select * from Weather.question_type_1;");      // 讀取結果集      while (rs.next()) {        System.out.println("column1:"+rs.getInt(1));        System.out.println("column2:"+rs.getString(2));        System.out.println("column3:"+rs.getString(3));        System.out.println("column4:"+rs.getString(4));      }      // 關閉鏈接      con.close();    } catch(Exception e) {      System.err.println("Exception: " + e.getMessage());    }  }}