Image Resize
Asagida image lari resize eden bir servlet bulabilirsiniz. Buna gore gonderdiginiz parametreler uzerinden resize islemi yapilabilir.
Kod cagirimi asagidaki gibi olacaktir
www.melihsakarya.com/ImageResize?file=demo.gif&width=200
Servlet tanimi
<servlet>
<description></description>
<display-name>ImageResizer</display-name>
<servlet-name>ImageResizer</servlet-name>
<servlet-class>
com.mergeCons.util.image.ImageResizer
</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>ImageResizer</servlet-name>
<url-pattern>/ImageResizer</url-pattern>
</servlet-mapping>
Java kodu
package com.mergeCons.utils.image;
import java.awt.AlphaComposite;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import javax.imageio.ImageIO;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class for Servlet: ImageResizer
*
*/
public class ImageResizer extends HttpServlet {
private static final long serialVersionUID = -8285774993751841288L;
public void doGet(HttpServletRequest request, HttpServletResponse response) {
String imageOutput = getParam(request, "output", "jpg");
String imageRoot = getParam(request, "root", "c:/upl/");
String imageFile = getParam(request, "file", "mergeCons.gif");
int width = Integer.parseInt(getParam(request, "width", "250"));
int height = Integer.parseInt(getParam(request, "height", "0"));
if ("png".equals(imageOutput)) {
response.setContentType("image/png");
} else {
response.setContentType("image/jpeg");
}
//String imageLoc = request.getSession().getServletContext().getRealPath(imageRoot) +"\\"+ imageFile;
String imageLoc = imageRoot+imageFile;
System.out.println("imageLoc = " + imageLoc);
if((new File(imageRoot+width+"x"+imageFile)).exists()){
System.out.println("Dosya var = " + imageRoot+width+"x"+imageFile);
try {
BufferedImage bufferedImage = ImageIO.read(new File(imageRoot+width+"x"+imageFile));
ImageIO.write(bufferedImage, imageOutput, response.getOutputStream());
} catch (Exception e) {
System.out.println("Problem with image: " + imageLoc + e);
}
}
else{
System.out.println("Dosya yok ve yaratiliyor = " + imageRoot+width+"x"+imageFile);
try {
BufferedImage bufferedImage = ImageIO.read(new File(imageLoc));
int calcHeight = height > 0 ? height : (width * bufferedImage.getHeight() / bufferedImage.getWidth());
ImageIO.write(createResizedCopy(bufferedImage, width, calcHeight), imageOutput
, response.getOutputStream());
BufferedOutputStream buf = new BufferedOutputStream(new FileOutputStream(imageRoot+width+"x"+imageFile));
ImageIO.write(createResizedCopy(bufferedImage, width, calcHeight), imageOutput, buf);
buf.flush();
buf.close();
} catch (Exception e) {
System.out.println("Problem with image: " + imageLoc + e);
}
}
}
BufferedImage createResizedCopy(Image originalImage, int scaledWidth, int scaledHeight) {
BufferedImage scaledBI = new BufferedImage(scaledWidth, scaledHeight, BufferedImage.TYPE_INT_RGB);
Graphics2D g = scaledBI.createGraphics();
g.setComposite(AlphaComposite.Src);
g.drawImage(originalImage, 0, 0, scaledWidth, scaledHeight, null);
g.drawString("<a href="http://www.melihsakarya.com">www.melihsakarya.com</a>", 20, 20);
g.dispose();
return scaledBI;
}
private String getParam(HttpServletRequest request, String param, String def) {
String parameter = request.getParameter(param);
if (parameter == null || "".equals(parameter)) {
return def;
} else {
return parameter;
}
}
}
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