The codes below illustrate how to merge all PDF files and create new one.
We will user Apache PDFBox with Java to merge all PDF files and create new one. To use Apache PDFBox we need to download required jar or add dependency if using Maven build tool.
Here we will add dependency in project POM.xml file.
1. Add Maven dependency for Apache PDFBox.
<dependency>
<groupId>org.apache.pdfbox</groupId>
<artifactId>pdfbox</artifactId>
<version>2.0.4</version>
</dependency>
2. code:
import java.io.File;
import java.io.IOException;
import
org.apache.pdfbox.multipdf.PDFMergerUtility;
import
org.apache.pdfbox.pdmodel.PDDocument;
import
org.apache.pdfbox.pdmodel.encryption.InvalidPasswordException;
public class PDFMerger {
public static void main(String[] args){
File
file1 = new File("D:\\pdf\\filePDF1.pdf");
File
file2 = new File("D:\\pdf\\filePDF2.pdf");
File
file3 = new File("D:\\pdf\\filePDF2.pdf");
File[]
pdfFiles = {file1,file2,file3};
PDDocument
pdDocument = null;
PDFMergerUtility
pdfMergerUtil = new PDFMergerUtility();
try {
for (File pdf : pdfFiles) {
PDDocument
pdDoc = null;
try {
if(null == pdDocument){
pdDocument = PDDocument.load(pdf);
}else{
pdDoc = PDDocument.load(pdf);
pdfMergerUtil.appendDocument(pdDocument, pdDoc);
}
}
catch
(InvalidPasswordException e) {
e.printStackTrace();
}
catch (IOException e) {
e.printStackTrace();
}
finally {
if (pdDoc != null) {
pdDoc.close();
}
}
}
System.out.println("PDF merging
done....");
pdDocument.save("D:\\pdf\\merged.pdf");
}
catch (IOException e) {
e.printStackTrace();
}
finally {
try {
if (pdDocument != null) {
pdDocument.close();
}
} catch (IOException ioe) {
ioe.printStackTrace();
}
}
}
}
