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try{
  Connection con = null;
  Statement sta = null;
  ResultSet rs = null;
  
  Class.forName("com.mysql.jdbc.Driver");
  DriverManager.registerDriver(new com.mysql.jdbc.Driver());
  
  String add = "jdbc:mysql://localhost:3306/blog";
  String user = "root";
  String pass = "123";
  
  con = java.sql.DriverManager.getConnection(add,user,pass);
  sta = con.createStatement();

 String name = new String(request.getParameter("name").getBytes("iso8859_1"));
 String context = new String(request.getParameter("context").getBytes("iso8859_1"));
 String classID = request.getParameter("classID");
 
 String in = "insert into rizhi values(null,'"+name+"','"+context+"',"+classID+")";
 sta.executeUpdate(in);