Generate Image Files
This section illustrates you how to generate image files. For this, we have
used the class ImageIO which provides methods for locating ImageReaders and
ImageWriters.
The method createGraphics() creates a Graphics2D and draw into the BufferedImage.
To render the specified font on a particular screen, the class FontMetrics
is used. The method getFontMetrics() get the font metrics of current
font. The method getAscent() provides the font ascent of the font. The
method stringWidth(text) returns the total width to show the specified
string in the specified font.
The method writes() writes an image using ImageWriter in the file.
Here is the code of GenerateImageType.java
import java.io.*;
import java.awt.*;
import java.awt.image.*;
import javax.imageio.ImageIO;
public class GenerateImageType {
static public void main(String args[]) throws Exception {
int width = 200, height = 180;
BufferedImage bufferedImage = new BufferedImage(width, height,
BufferedImage.TYPE_INT_ARGB);
Graphics2D g2d = bufferedImage.createGraphics();
Font font = new Font("Arial", Font.BOLD, 24);
g2d.setFont(font);
String text = "Welcome!";
FontMetrics fontMetrics = g2d.getFontMetrics();
int stringWidth = fontMetrics.stringWidth(text);
int stringHeight = fontMetrics.getAscent();
g2d.setPaint(Color.black);
g2d.drawString(text, (width - stringWidth) / 2, height / 2 +
stringHeight / 4);
ImageIO.write(bufferedImage, "gif", new File("C:\\image.GIF"));
ImageIO.write(bufferedImage, "JPEG", new File("C:\\image.JPG"));
ImageIO.write(bufferedImage, "PNG", new File("C:\\image.PNG"));
ImageIO.write(bufferedImage, "BMP", new File("C:\\image.BMP"));
ImageIO.write(bufferedImage, "TIF", new File("C:\\image.TIF"));
}
}
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After compilation, when you the run the program, the image files are saved
in the specified location. The image file contains the following image:
Download Source Code
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