pom文件

      <dependency><groupId>com.lowagie</groupId><artifactId>itext</artifactId><version>2.1.7</version></dependency>

主文件

import com.lowagie.text.Document;
import com.lowagie.text.pdf.PdfCopy;
import com.lowagie.text.pdf.PdfImportedPage;
import com.lowagie.text.pdf.PdfReader;
import java.io.FileOutputStream;public class PdfUtil {/*** 合并pdf* @param files 需要合并的pdf路径* @param newfile 合并成新的文件的路径*/public static boolean mergePdfFiles(String[] files, String newfile) {boolean retValue = false;Document document = null;PdfCopy copy = null;PdfReader reader = null;try {document = new Document(new PdfReader(files[0]).getPageSize(1));copy = new PdfCopy(document, new FileOutputStream(newfile));document.open();for (int i = 0; i < files.length; i++) {reader = new PdfReader(files[i]);int n = reader.getNumberOfPages();for (int j = 1; j <= n; j++) {document.newPage();PdfImportedPage page = copy.getImportedPage(reader, j);copy.addPage(page);}reader.close();}retValue = true;} catch (Exception e) {e.printStackTrace();} finally {if (reader != null) {reader.close();}if (copy != null) {copy.close();}if (document != null) {document.close();}}return retValue;}public static void main(String[] args) {//源文件--需要合并的文件String[] files = {"C:\\Users\\bdc1.pdf","C:\\Users\\bdc2.pdf" ,"C:\\Users\\bdc3.pdf"};//合并后的文件String savepath = "C:\\Users\\bdc0.pdf";boolean b = mergePdfFiles(files, savepath);System.out.println(b);}
}