java - 将java代码连接到mysql时遇到问题

Question

Exception in thread "main" com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server. Attempted reconnect 3 times. Giving up.

public class MyClass {

    public static void main(String[] args) throws Exception {



         String url= "jdbc:mysql://localhost:3306/first/?useUnicode=yes&autoReconnect=true&useSSL=false";
         String uname="root";
         String pass="****";

         Class.forName("com.mysql.jdbc.Driver");
         Connection con= DriverManager.getConnection(url,uname,pass);

         Statement st= con.createStatement();
         ResultSet rs=st.executeQuery("select name from sample_t where rollno=1");

         rs.next();
         String name1=rs.getString("name");
         System.out.println(name1);

         st.close();
         con.close();
    }

}

Answer 1

请检查您的 MySQL 服务器是否正在运行。