JSP表单处理

Question

I am currently making a jsp project called phonebook online. Its a phonebook on a browser. I'm still a beginner . I am having a slight difficulty adding the users input to my sql database. when i press the button to add the users input- null -shows to my database as firstname and lastname instead of the input of the user.

This are some of the line code for the input field from my Welcomeform.jsp file.

<td>First Name:</td>                            
<td><input type = "text" name = "fname" id="name">
</td>
<td>Last Name:</td>             
<td><input type = "text" name ="lname"  id ="name"></td>

This is the entire code in my adduser.jsp file.

<%@page language="java"%>
<%@page import="java.sql.*"%>
<%
    String firstname = request.getParameter("fname");
    String lastname = request.getParameter("lname");
    String phoneno = request.getParameter("phonenumber");

    try {
        Class.forName("com.mysql.jdbc.Driver").newInstance();
        Connection conn = DriverManager.getConnection(
                "jdbc:mysql://localhost:3306/phonebook", "**", "**");

        Statement st = conn.createStatement();

        st.executeUpdate("insert into  contaclist(firstname,lastname) values('"
                + firstname + "','" + lastname + "')");
        out.println("Record is added successfully");
    } catch (Exception e) {
        out.println("error adding");
    }
%>

Answer 1

Connection conn = DriverManager.getConnection( "jdbc:mysql://localhost:3306/phonebook", " ", " ");

Please make sure that you have right access to the database you can use

System.out.println(conn) ;

to check your connection

ResultSet rs ;
Statement st = conn.createStatement("insert into  contaclist(firstname,lastname) values("?,?")");
st.setString(1,firstname);
st.setString(2,lastname);
int k= st.executeUpdate();
System.out.println(k);

If the output is 1 then record is inserted sucessfully ..