pdfbox - 添加水印、读取文本

 

package seaboot.core.pdf;

import java.io.File;
import java.io.IOException;

import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.PDPageContentStream;
import org.apache.pdfbox.pdmodel.encryption.InvalidPasswordException;
import org.apache.pdfbox.pdmodel.font.PDFont;
import org.apache.pdfbox.pdmodel.font.PDType1Font;
import org.apache.pdfbox.pdmodel.graphics.state.PDExtendedGraphicsState;
import org.apache.pdfbox.text.PDFTextStripper;
import org.apache.pdfbox.util.Matrix;

public class TestPdfBox {
    public static void main(String[] args) throws InvalidPasswordException, IOException {
        readString("C:\\Users\\12614\\Desktop\\test1.pdf");
    }

    /**
     * 读取文本
     */
    public static void readString(String source) throws IOException{
        PDDocument doc = PDDocument.load(new File(source));
        PDFTextStripper stripper = new PDFTextStripper();
        // 设置按顺序输出
        stripper.setSortByPosition(true);
        stripper.setStartPage(1);
        stripper.setEndPage(doc.getNumberOfPages());
        String text = stripper.getText(doc);
        System.out.println(text);
    }
    
    /**
     * 水印
     */
    public static void markTxt(String source, String target) throws InvalidPasswordException, IOException {
        File tmpPDF = new File(target);
        PDDocument doc = PDDocument.load(new File(source));
        doc.setAllSecurityToBeRemoved(true);
        for (PDPage page : doc.getPages()) {
            PDPageContentStream cs = new PDPageContentStream(doc, page, PDPageContentStream.AppendMode.APPEND, true,
                    true);
            
            String ts = "Some sample text";
            PDFont font = PDType1Font.HELVETICA_OBLIQUE;
            // PDResources resources = page.getResources();
            PDExtendedGraphicsState r0 = new PDExtendedGraphicsState();
            // 透明度
            r0.setNonStrokingAlphaConstant(0.2f);
            r0.setAlphaSourceFlag(true);
            cs.setGraphicsStateParameters(r0);
            cs.setNonStrokingColor(200, 0, 0);// Red
            cs.beginText();
            float fontSize = 50.0f;
            cs.setFont(font, fontSize);
            // 获取旋转实例
            cs.setTextMatrix(Matrix.getRotateInstance(20, 350f, 490f));
            cs.showText(ts);
            cs.endText();

            cs.close();
        }
        doc.save(tmpPDF);
    }
}