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In what follows, I ll illustrate the solution in the context of a trivial webmail app. This webapp has just two pages: the first allows the user to compose an email message, and the second page displays the contents of the email. Figure 11-2 shows what the compose page looks like, while Figure 11-3 depicts the output page.

Diodes are one-way valves. In exactly the same way that a non-return valve in a water pipe will allow water to flow in one direction but not in the other, the diode allows a current to flow in one direction but not the other. You came across diodes when you used LEDs. An LED has a polarity. You connect the positive terminal of the power to the long lead on the LED to make the LED turn on. By turning the LED

Figure 11-3. The output page (showing six attached files)

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around, the LED will not only fail to illuminate but will also prevent electricity from flowing across its terminals. The diode has a white band around it next to the negative lead. Imagine the white band as being a barrier. Electricity flows through the diode from the terminal that has no barrier. When you reverse the voltage and try to make it flow through the side that has the white band, the current will be stopped. Diodes are essential in protecting circuits from a reverse voltage, such as if you connecting a power supply the wrong way around or if a voltage is reversed such as the back EMF in your circuit. Therefore, always try to use them in your circuits wherever there is a danger of the power being reversed either by user error or via phenomena such as back EMF.

Struts has a robust way for you to put two submit buttons on a single form. I ve described this technique in detail in 17 s LookupDispatchAction. Please read that section before proceeding. In what follows, I ll assume that you know how LookupDispatchAction works. The starting point of the solution is Listing 11-4 s FileUploadForm. This ActionForm subclass contains all the functionality we need to upload an arbitrary number of forms. In order to accommodate the other fields of the email, we subclass FileUploadForm, as in Listing 11-5. This is good design since we can reuse the file uploading functionality in other forms.

Corporate Governance Principles of CA, Inc. On an annual basis, the Secretary of the Company shall prepare and distribute to the directors a detailed calendar of the meetings scheduled to be held by the Board and each of its Committees during the ensuing year. The calendar shall also specify the matters to be considered and acted upon at each such meeting, to the extent known at such time.

package net.thinksquared.webmail; import javax.servlet.http.*; import org.apache.struts.action.*; public class WebmailForm extends FileUploadForm{ private String _recipients; private String _subject; private String _message; public String getRecipients(){ return _recipients; } public String getSubject(){ return _subject; } public String getMessage(){ return _message; } public void setRecipients(String recipients){ _recipients = recipients; } public void setSubject(String subject){ _subject = subject; }

In the previous project, you used a transistor to control the motor. In this project, you are going to use a very popular motor driver IC called an L293D. The advantage of using this chip is that you can control two motors at the same time, plus you can control their direction. The chip can also be used to control a stepper motor, as you will find out in Project 28. (You can also use a pin-for-pin compatible chip known as the SN754410, which has a higher current rating.) Notice anything missing from the parts list Diodes, perhaps Not to worry; the IC has its own internal diodes, so you do not need one for this project.

public void setMessage(String message){ _message = message; } public ActionErrors validate(ActionMapping mapping, HttpServletRequest request){ ActionErrors errors = new ActionErrors(); //NO BLANK MESSAGES/RECIPIENTS/SUBJECTS if(_recipients.trim().length() == 0){ errors.add("recipients", new ActionMessage("webmail.error.recipients")); } if(_subject.trim().length() == 0){ errors.add("subject", new ActionMessage("webmail.error.subject")); } if(_message.trim().length() == 0){ errors.add("message", new ActionMessage("webmail.error.message")); } return errors; } } Listing 11-6 contains the JSP page that displays the compose page shown in Figure 11-2. For clarity, and to highlight the use of message keys in conjunction with LookupDispatchAction, I ve not used message resources consistently in Listing 11-6.

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