mergePdfUtil.java
import com.itextpdf.text.Document; import com.itextpdf.text.pdf.PdfCopy; import com.itextpdf.text.pdf.PdfReader; import com.ruoyi.common.constant.Constants; import com.ruoyi.framework.config.RuoYiConfig; import java.io.File; import java.io.FileOutputStream; import java.util.List; /** * @author hzj * @date 2020/10/8 15:02 */ public class MergePdfUtil { /** * * @param pdfFilesName 文件路径集合 * @param newUrl 用于存放合并后的pdf * @param httpUrl 服务器路径 */ public static void MergePdf(List<String> pdfFilesName, String newUrl, String httpUrl) { PdfReader reader = null; Document document = null; try { //创建文件夹 File file = new File(newUrl); if(!file.getParentFile().exists()){ file.getParentFile().mkdirs(); } String docUrl = serviceUrl(pdfFilesName.get(0), httpUrl); document = new Document(new PdfReader(docUrl).getPageSize(1)); PdfCopy pdfCopy = new PdfCopy(document, new FileOutputStream(newUrl)); int pageCount = 0; document.open(); for (int i = 0; i < pdfFilesName.size(); ++i) { System.out.println(pdfFilesName.get(i)); String serviceUrl = serviceUrl(pdfFilesName.get(i),httpUrl); System.out.println(serviceUrl); File file1 = new File(serviceUrl); if(file1.exists()){ reader = new PdfReader(serviceUrl); pageCount = reader.getNumberOfPages(); for (int j = 1; j <= pageCount; ++j) { pdfCopy.addPage(pdfCopy.getImportedPage(reader, j)); } } } } catch (Exception e) { e.printStackTrace(); }finally { document.close(); } } //替换后缀，拼出文件在服务器的路径 private static String serviceUrl(String url,String httpUrl){ String httpUrls = httpUrl + Constants.RESOURCE_PREFIX; String[] split = url.split(httpUrls); int i = split[1].lastIndexOf("."); String substring = split[1].substring(0, i)+".pdf"; String replace = RuoYiConfig.getProfile()+ substring; return replace; } }遇到 PDF header signature not found，先排除文件损坏的原因，在仔细检查文件路径是否正确
