Java (482)
Converting images to PDF is beneficial for many reasons. For one reason, it allows you to convert images into a format that is more readable and easier to share. For another reason, it dramatically reduces the size of the file while preserving the quality of images. In this article, you will learn how to convert images to PDF in Java using Spire.PDF for Java.
There is no straightforward method provided by Spire.PDF to convert images to PDF. You could, however, create a new PDF document and draw images at the specified locations. Depending on whether the page size of the generated PDF matches the image, this topic can be divided into two subtopics.
Install Spire.PDF for Java
First, you're required to add the Spire.Pdf.jar file as a dependency in your Java program. The JAR file can be downloaded from this link. If you use Maven, you can easily import the JAR file in your application by adding the following code to your project's pom.xml file.
<repositories>
<repository>
<id>com.e-iceblue</id>
<name>e-iceblue</name>
<url>https://repo.e-iceblue.com/nexus/content/groups/public/</url>
</repository>
</repositories>
<dependencies>
<dependency>
<groupId>e-iceblue</groupId>
<artifactId>spire.pdf</artifactId>
<version>12.4.4</version>
</dependency>
</dependencies>
Additionally, the imgscalr library is used in the first code example to resize images. It is not necessary to install it if you do not need to adjust the image’s size.
Add an Image to PDF at a Specified Location
The following are the steps to add an image to PDF at a specified location using Spire.PDF for Java.
- Create a PdfDocument object.
- Set the page margins using PdfDocument.getPageSettings().setMargins() method.
- Add a page using PdfDocument.getPages().add() method
- Load an image using ImageIO.read() method, and get the image width and height.
- If the image width is larger than the page (the content area) width, resize the image to make it to fit to the page width using the imgscalr library.
- Create a PdfImage object based on the scaled image or the original image.
- Draw the PdfImage object on the first page at (0, 0) using PdfPageBase.getCanvas().drawImage() method.
- Save the document to a PDF file using PdfDocument.saveToFile() method.
- Java
import com.spire.pdf.PdfDocument;
import com.spire.pdf.PdfPageBase;
import com.spire.pdf.graphics.PdfImage;
import org.imgscalr.Scalr;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.FileInputStream;
import java.io.IOException;
public class AddImageToPdf {
public static void main(String[] args) throws IOException {
//Create a PdfDocument object
PdfDocument doc = new PdfDocument();
//Set the margins
doc.getPageSettings().setMargins(20);
//Add a page
PdfPageBase page = doc.getPages().add();
//Load an image
BufferedImage image = ImageIO.read(new FileInputStream("C:\\Users\\Administrator\\Desktop\\announcement.jpg"));
//Get the image width and height
int width = image.getWidth();
int height = image.getHeight();
//Declare a PdfImage variable
PdfImage pdfImage;
//If the image width is larger than page width
if (width > page.getCanvas().getClientSize().getWidth())
{
//Resize the image to make it to fit to the page width
int widthFitRate = width / (int)page.getCanvas().getClientSize().getWidth();
int targetWidth = width / widthFitRate;
int targetHeight = height / widthFitRate;
BufferedImage scaledImage = Scalr.resize(image,Scalr.Method.QUALITY,targetWidth,targetHeight);
//Load the scaled image to the PdfImage object
pdfImage = PdfImage.fromImage(scaledImage);
} else
{
//Load the original image to the PdfImage object
pdfImage = PdfImage.fromImage(image);
}
//Draw image at (0, 0)
page.getCanvas().drawImage(pdfImage, 0, 0, pdfImage.getWidth(), pdfImage.getHeight());
//Save to file
doc.saveToFile("output/AddImage.pdf");
}
}
Convert an Image to PDF with the Same Width and Height
The following are the steps to convert an image to a PDF with the same page size as the image using Spire.PDF for Java.
- Create a PdfDocument object.
- Set the page margins to zero using PdfDocument.getPageSettings().setMargins() method.
- Load an image using ImageIO.read() method, and get the image width and height.
- Add a page to PDF based on the size of the image using PdfDocument.getPages().add() method.
- Create a PdfImage object based on the image.
- Draw the PdfImage object on the first page from the coordinate (0, 0) using PdfPageBase.getCanvas().drawImage() method.
- Save the document to a PDF file using PdfDocument.saveToFile() method.
- Java
import com.spire.pdf.PdfDocument;
import com.spire.pdf.PdfPageBase;
import com.spire.pdf.graphics.PdfImage;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.FileInputStream;
import java.io.IOException;
public class ConvertImageToPdfWithSameSize {
public static void main(String[] args) throws IOException {
//Create a PdfDocument object
PdfDocument doc = new PdfDocument();
//Set the margins to 0
doc.getPageSettings().setMargins(0);
//Load an image
BufferedImage image = ImageIO.read(new FileInputStream("C:\\Users\\Administrator\\Desktop\\announcement.jpg"));
//Get the image width and height
int width = image.getWidth();
int height = image.getHeight();
//Add a page of the same size as the image
PdfPageBase page = doc.getPages().add(new Dimension(width, height));
//Create a PdfImage object based on the image
PdfImage pdfImage = PdfImage.fromImage(image);
//Draw image at (0, 0) of the page
page.getCanvas().drawImage(pdfImage, 0, 0, pdfImage.getWidth(), pdfImage.getHeight());
//Save to file
doc.saveToFile("output/ConvertPdfWithSameSize.pdf");
}
}
Apply for a Temporary License
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Conversion
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This article demonstrates how to split a PowerPoint document into multiple individual slides using Spire.Presentation for Java.
import com.spire.presentation.FileFormat;
import com.spire.presentation.Presentation;
public class SplitPowerPoint {
public static void main(String[] args) throws Exception {
//Load the sample PowerPoint file
Presentation ppt = new Presentation();
ppt.loadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pptx");
//Loop through the slides
for (int i = 0; i < ppt.getSlides().getCount(); i++)
{
//Create an instance of Presentation class
Presentation newppt = new Presentation();
//Remove the default slide
newppt.getSlides().removeAt(0);
//Select a slide from the source file and append it to the new document
newppt.getSlides().append(ppt.getSlides().get(i));
//Save to file
newppt.saveToFile(String.format("output/result-%d.pptx",i), FileFormat.PPTX_2013);
}
}
}
Output:
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Document Operation
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Table of contents (TOC) makes the PDF documents more accessible and easier to navigate, especially for large files. This article demonstrates how to create table of contents (TOC) for a PDF document using Spire.PDF for Java.
import com.spire.pdf.*;
import com.spire.pdf.actions.PdfGoToAction;
import com.spire.pdf.annotations.*;
import com.spire.pdf.general.PdfDestination;
import com.spire.pdf.graphics.*;
import java.awt.*;
import java.awt.geom.*;
public class TableOfContent {
public static void main(String[] args) throws Exception
{
//load PDF file
PdfDocument doc = new PdfDocument("sample.pdf");
int pageCount = doc.getPages().getCount();
//Insert a new page as the first page to draw table of content
PdfPageBase tocPage = doc.getPages().insert(0);
//set title
String title = "Table Of Contents";
PdfTrueTypeFont titleFont = new PdfTrueTypeFont(new Font("Arial", Font.BOLD,20));
PdfStringFormat centerAlignment = new PdfStringFormat(PdfTextAlignment.Center, PdfVerticalAlignment.Middle);
Point2D location = new Point2D.Float((float) tocPage.getCanvas().getClientSize().getWidth() / 2, (float) titleFont.measureString(title).getHeight());
tocPage.getCanvas().drawString(title, titleFont, PdfBrushes.getCornflowerBlue(), location, centerAlignment);
//draw TOC text
PdfTrueTypeFont titlesFont = new PdfTrueTypeFont(new Font("Arial", Font.PLAIN,14));
String[] titles = new String[pageCount];
for (int i = 0; i < titles.length; i++) {
titles[i] = String.format("page%1$s", i + 1);
}
float y = (float)titleFont.measureString(title).getHeight() + 10;
float x = 0;
for (int i = 1; i <= pageCount; i++) {
String text = titles[i - 1];
Dimension2D titleSize = titlesFont.measureString(text);
PdfPageBase navigatedPage = doc.getPages().get(i);
String pageNumText = (String.valueOf(i+1));
Dimension2D pageNumTextSize = titlesFont.measureString(pageNumText);
tocPage.getCanvas().drawString(text, titlesFont, PdfBrushes.getCadetBlue(), 0, y);
float dotLocation = (float)titleSize.getWidth() + 2 + x;
float pageNumlocation = (float)(tocPage.getCanvas().getClientSize().getWidth() - pageNumTextSize.getWidth());
for (float j = dotLocation; j < pageNumlocation; j++) {
if (dotLocation >= pageNumlocation) {
break;
}
tocPage.getCanvas().drawString(".", titlesFont, PdfBrushes.getGray(), dotLocation, y);
dotLocation += 3;
}
tocPage.getCanvas().drawString(pageNumText, titlesFont, PdfBrushes.getCadetBlue(), pageNumlocation, y);
//add TOC action
Rectangle2D titleBounds = new Rectangle2D.Float(0,y,(float)tocPage.getCanvas().getClientSize().getWidth(),(float)titleSize.getHeight());
PdfDestination Dest = new PdfDestination(navigatedPage, new Point2D.Float(-doc.getPageSettings().getMargins().getTop(), -doc.getPageSettings().getMargins().getLeft()));
PdfActionAnnotation action = new PdfActionAnnotation(titleBounds, new PdfGoToAction(Dest));
action.setBorder(new PdfAnnotationBorder(0));
((PdfNewPage) ((tocPage instanceof PdfNewPage) ? tocPage : null)).getAnnotations().add(action);
y += titleSize.getHeight() + 10;
}
//save the resultant file
doc.saveToFile("addTableOfContent.pdf");
doc.close();
}
}
Output:
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Document Operation
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