使用 Java 编辑 PDF 文本
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Editing PDF text using Java
提问by Ammar
Is there a way I can edit a PDF from Java?
I have a PDF document which contains placeholders for text that I need to be replaced using Java, but all the libraries that I saw created PDF from scratch and small editing functionality.
Is there anyway I can edit a PDF or is this impossible?
有没有办法可以从 Java 编辑 PDF？
我有一个 PDF 文档，其中包含我需要使用 Java 替换的文本占位符，但是我看到的所有库都是从头开始创建 PDF 和小型编辑功能的。
无论如何我可以编辑PDF还是不可能？
采纳答案by bluish
You can do it with iText. I tested it with following code. It adds a chunk of text and a red circle over each page of an existing PDF.
你可以用iText做到这一点。我用以下代码对其进行了测试。它会在现有 PDF 的每一页上添加一段文本和一个红色圆圈。
/* requires itextpdf-5.1.2.jar or similar */
import java.io.*;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.pdf.*;
public class AddContentToPDF {
public static void main(String[] args) throws IOException, DocumentException {
/* example inspired from "iText in action" (2006), chapter 2 */
PdfReader reader = new PdfReader("C:/temp/Bubi.pdf"); // input PDF
PdfStamper stamper = new PdfStamper(reader,
new FileOutputStream("C:/temp/Bubi_modified.pdf")); // output PDF
BaseFont bf = BaseFont.createFont(
BaseFont.HELVETICA, BaseFont.CP1252, BaseFont.NOT_EMBEDDED); // set font
//loop on pages (1-based)
for (int i=1; i<=reader.getNumberOfPages(); i++){
// get object for writing over the existing content;
// you can also use getUnderContent for writing in the bottom layer
PdfContentByte over = stamper.getOverContent(i);
// write text
over.beginText();
over.setFontAndSize(bf, 10); // set font and size
over.setTextMatrix(107, 740); // set x,y position (0,0 is at the bottom left)
over.showText("I can write at page " + i); // set text
over.endText();
// draw a red circle
over.setRGBColorStroke(0xFF, 0x00, 0x00);
over.setLineWidth(5f);
over.ellipse(250, 450, 350, 550);
over.stroke();
}
stamper.close();
}
}
回答by Ammar
Take a look at iTextand this sample code
回答by mark stephens
You can do limited editing with Itext but PDF is an end file format so you cannot do anything too complex. I wrote an article explaining some of the limitations: PDF format and style information.
您可以使用 Itext 进行有限的编辑，但 PDF 是一种最终文件格式，因此您不能做任何太复杂的事情。我写了一篇文章解释了一些限制：PDF 格式和样式信息。
回答by Ravi Kant
Take a look at asposeand this sample code
回答by Carlos Rosas
I modified the code found a bit and it was working as follows
我修改了发现的代码，它的工作方式如下
public class Principal {
public static final String SRC = "C:/tmp/244558.pdf";
public static final String DEST = "C:/tmp/244558-2.pdf";
public static void main(String[] args) throws IOException, DocumentException {
File file = new File(DEST);
file.getParentFile().mkdirs();
new Principal().manipulatePdf(SRC, DEST);
}
public void manipulatePdf(String src, String dest) throws IOException, DocumentException {
PdfReader reader = new PdfReader(src);
PdfDictionary dict = reader.getPageN(1);
PdfObject object = dict.getDirectObject(PdfName.CONTENTS);
PdfArray refs = null;
if (dict.get(PdfName.CONTENTS).isArray()) {
refs = dict.getAsArray(PdfName.CONTENTS);
} else if (dict.get(PdfName.CONTENTS).isIndirect()) {
refs = new PdfArray(dict.get(PdfName.CONTENTS));
}
for (int i = 0; i < refs.getArrayList().size(); i++) {
PRStream stream = (PRStream) refs.getDirectObject(i);
byte[] data = PdfReader.getStreamBytes(stream);
stream.setData(new String(data).replace("NULA", "Nulo").getBytes());
}
PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(dest));
stamper.close();
reader.close();
}
}
}
