linux环境 itext 合并pdf

pom依赖

<dependency><groupId>com.itextpdf</groupId><artifactId>itextpdf</artifactId><version>5.5.13</version>
</dependency>

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 {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;}
}