Resize Image with Lotus Script and Java on Lotus Notes

Wer in Lotus Notes Anwendungen entwickelt ist sicherlich auch bereits über die Problematik mit Bilddateien gestolpert. Wer per Code ein Bild in bestimmter grösse einfügen will muss dies normalerweise über ein Addon DLL erledigen. Da meine Anwendung jedoch ohne Zusatzsoftware auskommen soll habe ich mich entschieden eine entsprechende Java/Lotus Script Klasse zu schreiben.

1. Schritt: Lotus Script Bibliotheke “LSJavaImageResizer” erstellen

Nachfolgend der Code für die Lotus Script Klasse:

%REM
	Code and Library written by Yves Menge (yves.menge@gmail.com)
	For updates / news visit http://blog.y-m-e.net
	09.08.2011
%END REM

Option Public
Option Declare

UseLSX "*javacon"
Use "JavaLibrary"

%REM
	Sample Code for use in Lotus Script:

	***

	Use "LSJavaImageResizer"
	Dim lsImageResizer As New LSJavaImageResizer([PathToSourceImage], [PathToTempDir],[MaxImageHeight],[MaxImageWidth],[UpscaleSmallImages])

	'Parameters:
	'[PathToSourceImage] 	=> Path to source image as string (eg. C:\Test.jpg)
	'[PathToTempDir]		=> Path to Tempfile as string (eg. C:\Temp\
	'[MaxImageHeight]		=> Max image height in pixels as int or long (eg. 200)
	'[MaxImageWidth]		=> Max image width in pixelx as int or long (eg. 200)
	'[UpscaleSmallImages]	=> 1 (true) or 0 (false)

	Dim strResizedImage as String = lsImageResizer.StartResizePicture()

	'Possible Response Strings:
	'OK			=> Path to resized image as string (eg. C:\Temp\img123456789.jpg)
	'ERROR		=> "ERROR" as string, no error description is suplied!

	'REMARK: 	This class does only the resizing stuff, it's on your own to delete the probably unused generated files
	'			in the temp directory!

%END REM

Public Class LSJavaImageResizer

	'Define Vars
	jSession As JAVASESSION
	jObject As JAVAOBJECT
	jClass As JAVACLASS

	'Resizer Setup Vars
	strSourceFile As String
	strTempDir As String
	intHeight As Integer
	intWidth As Integer
	intMakeImageLarger As Integer

	'SUB New -> Cunstructor
	Sub New (ByVal sFile As String, ByVal sTempDir As String, ByVal iHEIGHT As Integer, ByVal iWIDHT As Integer, ByVal iMakeImageLarger As Integer)
		'Initialize JAVA Class
		Set jSession = New JAVASESSION
		Set jClass=jSession.GetClass("JavaImageResizer")
		Set jObject = jClass.CreateObject

		strSourceFile = sFile
		strTempDir = sTempDir
		intHeight = iHeight
		intWidth = iWidht
		intMakeImageLarger = iMakeImageLarger
	End Sub

	'Resize Image
	Function StartResizePicture ()
		Dim strReturnCode As String

		strReturnCode=jObject.Resize(strSourceFile, strTempDir, intHeight, intWidth, intMakeImageLarger)

		'Return Path for resized Image
		StartResizePicture = strReturnCode
	End Function
End Class

2. Schritt: Java Bibliotheke “JavaLibrary” erstellen

Nachfolgend der Code für die Java Klasse “JavaImageResizer.java”

/*
 *
 *Code and Library written by Yves Menge (yves.menge@gmail.com)
 *For updates / news visit http://blog.y-m-e.net
 *09.08.2011
 *
 */

import java.awt.AlphaComposite;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.io.File;
import javax.imageio.ImageIO;
import java.util.Calendar;

public class JavaImageResizer {

	public String Resize(String strSourceFile, String strTempDir, int intMaxHeight, int intMaxWidth, int intMakeImageLarger){
		float imgResizedWidth;
		float imgResizedHeight;
		String strOutputFile = "";

		try{
		//Get milliseconds (for random filename)
		Calendar cal = Calendar.getInstance();
		String strRandomNumber = String.valueOf(cal.getTimeInMillis());

		//Construct destination path and get image type
		strOutputFile = strTempDir + "img" + strRandomNumber + ".jpg";
		BufferedImage originalImage = ImageIO.read(new File(strSourceFile));
		int type = originalImage.getType() == 0? BufferedImage.TYPE_INT_ARGB : originalImage.getType();

		//Get original size
		imgResizedWidth = originalImage.getWidth();
		imgResizedHeight = originalImage.getHeight();

		//Change dimensions to fit maximum width and height
		float imgAspectRatio = 0;

		// Calculate image dimension for destination
		if (imgResizedWidth > intMaxWidth || imgResizedWidth < intMaxWidth && imgResizedWidth >= imgResizedHeight && intMakeImageLarger==1){
			imgAspectRatio = intMaxWidth / imgResizedWidth;
			imgResizedWidth = java.lang.Math.round(imgAspectRatio * imgResizedWidth);
			imgResizedHeight = java.lang.Math.round(imgAspectRatio * imgResizedHeight);
		}
		if (imgResizedHeight > intMaxHeight || imgResizedHeight < intMaxHeight && imgResizedHeight >= imgResizedWidth && intMakeImageLarger==1) {
			imgAspectRatio = intMaxHeight / imgResizedHeight;
			imgResizedWidth = java.lang.Math.round(imgAspectRatio * imgResizedWidth);
			imgResizedHeight = java.lang.Math.round(imgAspectRatio * imgResizedHeight);
			}

		//Resize Image
		BufferedImage resizeImageHint = reSizeImage(originalImage, type, (int)imgResizedHeight, (int)imgResizedWidth);
		ImageIO.write(resizeImageHint, "jpg", new File(strOutputFile)); 

		}
		catch(Exception e) {
			e.printStackTrace();
			strOutputFile="ERROR";
		}
		// Return path to resized image or ERROR in case of a failure
		return strOutputFile;
	}

	private static BufferedImage reSizeImage(BufferedImage originalImage, int type, int imgHeight, int imgWidth){
		BufferedImage resizedImage = new BufferedImage(imgWidth, imgHeight, type);
		Graphics2D g = resizedImage.createGraphics();
		g.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
		RenderingHints.VALUE_INTERPOLATION_BILINEAR);
		g.setRenderingHint(RenderingHints.KEY_RENDERING,
		RenderingHints.VALUE_RENDER_QUALITY);
		g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
		RenderingHints.VALUE_ANTIALIAS_ON);
		g.drawImage(originalImage, 0, 0, imgWidth, imgHeight, null);
		g.dispose();
		g.setComposite(AlphaComposite.Src);

		return resizedImage;
	    }
}

Etwas zur Verwendung des Codes

Der Code darf mit einem Vermerk auf seine Herkunft gerne verwendet werden. Ich übernehme keine Garantie für mögliche Schäden oder Fehler welche durch meinen Code entstehen. Verbesserungen oder Kritik? Ab in die Kommentare damit

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