PDFUtils

Utility methods to convert PDF files. For example, to stamp image or text. 

Methods

merge

Description:

Method	Return values	Description
merge(List inputs, OutputStream output)	void	Merge several PDFs into a new one.

• inputs: List of inputs stream for merge.
• output: Output stream of the file.

Example:

package com.openkm;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import org.apache.commons.io.IOUtils;

import com.openkm.api.OKMDocument;
import com.openkm.bean.Document;
import com.openkm.util.PDFUtils;
import com.openkm.util.PathUtils;
import com.openkm.util.FileUtils;

public class Test {
  public static void main(String[] args) {
    FileOutputStream fos = null;
    FileInputStream fis = null;
    File tmp = null;
    try {
      List<InputStream> inputs = new ArrayList<InputStream>();
      tmp = FileUtils.createTempFile("pdf");
      fos = new FileOutputStream(tmp);

      inputs.add(OKMDocument.getInstance().getContent(null, "/home/openkm/test1.pdf", false));
      inputs.add(OKMDocument.getInstance().getContent(null, "/home/openkm/test2.pdf", false));

      // Merge document
      PDFUtils.merge(inputs, fos);

      // Create document in repository
      String fldPath = PathUtils.getParent("/home/openkm/test1.pdf"); // all documents are in same path
      String docPath = fldPath + "/docMerge";
      fis = new FileInputStream(tmp);
      OKMDocument.getInstance().createSimple(null, docPath, fis);
    } catch (Exception e) {
      e.printStackTrace();
    } finally {
      IOUtils.closeQuietly(fis);
      IOUtils.closeQuietly(fos);
      FileUtils.deleteQuietly(tmp);
    }
  }
}

stampImage

Description:

Method	Return values	Description
stampImage(InputStream input, byte[] image, OutputStream output)	void	Stamp PDF document with image watermark.

• input: The input stream of the file.
• image: The content of the file.
• output: Output stream of the file.

Example:

package com.openkm;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.file.Files;
import java.nio.file.Paths;

import com.openkm.util.PDFUtils;

public class Test {
  public static void main(String[] args) {
    try {
      String path = "/home/openkm/test.pdf";
      File file = new File(path);
      InputStream is = new FileInputStream(file);
      OutputStream out = new FileOutputStream(file);
      byte[] data = Files.readAllBytes(Paths.get("/home/luis/test.png"));
      PDFUtils.stampImage(is, data, out);
      is.close();
      out.close();
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
}

stampText

Description:

Method	Return values	Description
stampText(InputStream input, String text, OutputStream output)	void	Stamp PDF document with text watermark.

• input: The input stream of the file.
• text: A text for the stamp.
• output: Output stream of the file.

Example:

package com.openkm;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;

import com.openkm.util.PDFUtils;

public class Test {
  public static void main(String[] args) {
    try {
      String path = "/home/openkm/test.pdf";
      File file = new File(path);
      InputStream is = new FileInputStream(file);
      OutputStream out = new FileOutputStream(file);
      PDFUtils.stampText(is, "This is the text", out);
      is.close();
      out.close();
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
}

getNumberOfPages

Description:

Method	Return values	Description
getNumberOfPages(String token, String docId)	int	Return the number of pages for a PDF.

• input: The input stream of the file.
• text: A text for the stamp.
• docId: PDF OpenKM unique identifier.

Example:

package com.openkm;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;

import com.openkm.util.PDFUtils;

public class Test {
  public static void main(String[] args) {
    try {
      String docId = "e6b61e8d-4bf1-4c37-828f-09ecc34261cc";
      System.out.prinln(PDFUtils.getNumberOfPages(null, docId));
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
}