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protected Map getKeyMethodMap(){ Map m = new HashMap(); m.put("myapp.submit.button.print","print"); m.put("myapp.submit.button.save","save"); return m; } public ActionForward print(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { //code to print here. //remember to return the "next" page. } public ActionForward save(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { //code to save here. //remember to return the "next" page. } } As you can see in Listing 17-7: getKeyMethodMap() returns a Map instance, which contains the message keys used for each submit button s text. This message key is associated with the name of the function in your LookupDispatchAction subclass, which needs to be called. Note that getKeyMethodMap() is called only once, so there s no need to save a copy of the returned Map instance. In fact, the base class automatically saves the returned instance for you. There are functions, print() and save(), with the same signature as execute(). These do the work of printing and saving the submitted form data. Which function is called depends on the submit button clicked by the user. There is no implementation of execute(), since we want to implicitly use the base class s execute() in order to call either print() or save().

When you run the code the current temperature will be displayed on the top row of the LCD. The bottom row will display the maximum and minimum temperatures recorded since the Arduino was turned on or the program was reset. By pressing the button, you can change the temperature scale between Celsius and Fahrenheit.

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That s all there is to using LookupDispatchAction, apart from a couple of loose strings: If the request URL contains no action parameter, then an Exception is thrown. Rather than leave this to chance, you might find it expedient to trap such errors by implementing a function called unspecified(), with the same signature as execute(). You should not declare this function in getKeyMethodMap(). Some forms use a cancel button. You can implement this using <html:cancel> on your form. You can handle a canceled form by implementing a function called cancelled(), with the same signature as execute(). You should not declare this function in getKeyMethodMap(). Using unspecified() and cancelled(), Listing 17-7 could be rewritten as shown in Listing 17-8.

As before, the LiquidCrystal library is loaded into your sketch: #include <LiquidCrystal.h> A LiquidCrystal object called lcd is initialized and the appropriate pins set: LiquidCrystal lcd(12, 11, 5, 4, 3, 2); // Create an lcd object and assign the pins Some integers to hold the maximum and minimum temperatures in degrees C and F are declared and initialized with impossible max and min values. These will be changed as soon as the program runs for the first time. int maxC=0, minC=100, maxF=0, minF=212; A variable called scale of type int is declared and initialized with 1. The scale variable will decide if you are using Celsius or Fahrenheit as your temperature scale. By default, it s set to 1, which is Celsius. You can change this to -1 for Fahrenheit. int scale = 1; An integer to store the pin being used for the button is declared and initialized: int buttonPin=8; In the setup() loop, you set the display to be 16 columns and 2 rows: lcd.begin(16, 2); // Set the display to 16 columns and 2 rows The reference for the analogue pin is then set to INTERNAL: analogReference(INTERNAL); This gives you a better range on the Arduino s ADC (Analogue to Digital Convertor). The output voltage of the LM35DT at 100 C is 1v. If you were using the default reference of 5 volts, then at 50 C, which is half of the sensors range, the reading on the ADC would be 0.5v = (0.5/5)*1023 = 102, which is only about 10% of the ADC s range. When using the internal reference voltage of 1.1 volts, the value at the analogue pin at 50 C is now 0.5v = (0.5/1.1)*1023 = 465.

Listing 17-8. MyLookupDispatchAction with unspecified() and cancelled()

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