Using JDBC DataSources with Servlets and Java Server Pages - Java Database Programming Bible - page 319

</tr>
<tr>
<td>
Username:
</td>
<td>
<input type="text" name="username"><br>
</td>
</tr>
<tr>
<td>
Password:
</td>
<td>
<input type="password" name="password"><br>
</td>
</tr>
<tr>
<td colspan=2>&nbsp;</td>
</tr>
<tr>
<td>
<input type="submit" value="SUBMIT" name="submitButton">
</td>
</tr>
</table>
</form>
</body>
</html>
As you can see from Listing 12-2 , the action method uses the POST method to call the LoginServlet.
The two input fields UserName and Password are passed as parameters to the servlet. The GET
method can work just as well and is, in fact, implemented in the servlet code. POST is normally preferred
because it offers more flexibility. The code for the servlet itself is shown in the next section .
Creating the Servlet
The login servlet is not much more complex than the simple "Hello World" example of Listing 12-1 . In
this more practical example, the base class methods that need to be overridden are as follows:
init()
doPost()
doGet()
The code of Listing 12-3 shows the use of the init() method to load the JDBC driver. The
doGet() and doPost() methods are overridden to handle the user request. The writePage()
method simply exists to separate HTML output from JDBC code.