JAVA 利用iText解析PDF

系统对接了一个接口，遇到了利用iText解析PDFURL，解析下来导致文件已加密，损坏的问题。
这篇文章针对于老项目，不能随意升级JDK,升级包的问题。

iText-2.1.7.jar为例：

import com.lowagie.text.pdf.PdfCopy;
import com.lowagie.text.pdf.PdfImportedPage;
import com.lowagie.text.pdf.PdfReader;

import java.io.File;
import java.io.FileOutputStream;
import java.util.List;

/**

• Created by BugRoot
  */
  public class PDFUtil{

/**

• @param fileNames pdf的url路径
• @param outfile 保存pdf文件的地址
  /
  public static boolean mergePdfFiles(List fileNames, File outfile) throws Exception {
  boolean retValue = false;
  com.lowagie.text.Document document = null;
  try {
  String[] files = new String[fileNames.size()];
  for(int i=0;i<fileNames.size();i++){
  files[i]= fileNames.get(i);
  }
  document = new com.lowagie.text.Document(new PdfReader(files[0]).getPageSize(1));
  PdfCopy copy = new PdfCopy(document, new FileOutputStream(outfile));
  document.open();
  for (int i = 0; i < files.length; i++) {
  PdfReader 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);
  }
  }
  retValue = true;
  } catch (Exception e) {
  e.printStackTrace();
  } finally {
  document.close();
  }
  return retValue;
  }
  /*
  • 解密
  • @param fileNames pdf的url路径
  • @param outfile 保存pdf文件的地址
  • @return
  • @throws Exception
    */
    public static boolean mergePdfFilesDecrypt(List fileNames, File outfile) throws Exception {
    boolean retValue = false;
    com.lowagie.text.Document document = null;
    try {
    String[] files = new String[fileNames.size()];
    for(int i=0;i<fileNames.size();i++){
    files[i]= fileNames.get(i);
    }
    document = new com.lowagie.text.Document(new PdfReader(files[0]).getPageSize(1));
    PdfCopy copy = new PdfCopy(document, new FileOutputStream(outfile));
    document.open();
    for (int i = 0; i < files.length; i++) {
    PdfReader reader = new PdfReader(files[i]);
    // PdfReader.unethicalreading = true;//不支持
    Field f = PdfReader.class.getDeclaredField(“encrypted”);
    f.setAccessible(true);
    // f.set(reader, Boolean.TRUE);
    f.set(reader, false);
    int n = reader.getNumberOfPages();
    for (int j = 1; j <= n; j++) {
    document.newPage();
    PdfImportedPage page = copy.getImportedPage(reader, j);
    copy.addPage(page);
    }
    }
    retValue = true;
    } catch (Exception e) {
    e.printStackTrace();
    } finally {
    document.close();
    }
    return retValue;
    }
    }