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So you have created a LiquidCrystal object and called it lcd The first two parameters set the pins for RS (Register Select) and Enable The last four parameters are Data Pins D4 to D7 As you are using 4-bit mode, you are only using four of the eight data pins on the display The difference between 4-bit and 8-bit modes is that in 8-bit mode you can send data one byte at a time whereas in 4-bit mode the 8 bits have to be split up into to 4-bit numbers (known as nibbles) This makes the code larger and more complex However, you are using a readymade library, so you don t need to worry about that If, however, you were writing space- or time-critical code, you would consider writing directly to the LCD in 8-bit mode.

You might occasionally be required to let users download data from your webapp. If it s just a static file, this is a nonissue just put in a link to the file on a web page. However, it is often the case that the data in question is produced on demand. In this case, you ll have to handle the downloading process yourself. This isn t difficult (you need to write a valid HTTP header and then place the data into the HttpServletResponse object that comes with execute()), but it s a little tedious. The newly introduced (since 1.2.6) DownloadAction class simplifies this work. All you need to supply are An InputStream containing the data to be downloaded. A content type string (e.g., text/html or image/png) that describes the data s format. For a list of content type strings, take a look at the Useful Links section. DownloadAction has an inner static interface called StreamInfo: public static interface StreamInfo { public abstract String getContentType(); public abstract InputStream getInputStream() throws IOException; } that exposes the content type via getContentType(), and the InputStream through getInputStream(). To use DownloadAction, you need to Implement StreamInfo. Expose it by subclassing DownloadAction and overriding its getStreamInfo() function. Put in a form handler (<action> tag) in the struts-config.xml file, associating your DownloadAction subclass with a path. No <forward> element is necessary. (Can you tell why ) As a double bonus, DownloadAction comes with two inner classes, FileStreamInfo and ResourceStreamInfo, both of which implement the StreamInfo interface. You can use FileStreamInfo to allow downloading of a static file. The constructor for FileStreamInfo is

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Using 4-bit mode has the advantage of saving four pins which is useful if you want to connect other devices at the same time In the setup() loop you initialize the display to the size required, which is 16 columns and 2 rows: lcdbegin(16, 2); // Set the display to 16 columns and 2 rows The main program loop simply runs seven different demo routines, one by one, before restarting Each demo routine shows off one set of related routines in the LiquidCrystalh library: void loop() { // Run the seven demo routines basicPrintDemo(); displayOnOffDemo(); setCursorDemo(); scrollLeftDemo(); scrollRightDemo(); cursorDemo(); createGlyphDemo(); } The first function is basicPrintDemo() and it is designed to show use of the print() command This demo simply clears the display using lcdclear() and then prints to the display using lcdprint().

public FileStreamInfo(String contentType, File file)

which is self-explanatory. ResourceStreamInfo allows users to download a file within a webapp s root directory: public ResourceStreamInfo(String contentType, ServletContext context, String path)

Note that if you had initialized your LiquidCrystal object and called it, for example, LCD1602, then these commands would be LCD1602clear() and LCD1602print() accordingly In other words, the command comes after the name of the object, with a dot between them The print() command will print whatever is inside the brackets at the current cursor location The default cursor location is always column 0 and row 0, which is the top right corner After clearing the display, the cursor will be set to the default or home position void basicPrintDemo() { lcdclear(); // Clear the display lcdprint("Basic Print"); // Print some text delay(2000); } The second function is designed to show off the display() and noDisplay() commands These commands simply enable or disable the display.

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