Java 图片转PDF的开源库_pdimageximage-优快云博客

本文链接：https://blog.youkuaiyun.com/u014745465/article/details/141286003

1. Apache PDFBox

Apache PDFBox 是一个开源库，用于创建和操作 PDF 文档。

添加依赖

如果使用 Maven，可以在 pom.xml 中添加：

<dependency>
    <groupId>org.apache.pdfbox</groupId>
    <artifactId>pdfbox</artifactId>
    <version>2.0.24</version> <!-- 请根据需要检查最新版本 -->
</dependency>

示例代码（如果说图片位置展示不对，可以调整宽高）

import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.graphics.image.PDImageXImage;

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

public class ImageToPdfWithPdfBox {

    public static void main(String[] args) {
        String[] imagePaths = {"path/to/image1.jpg", "path/to/image2.png"};
        String outputPdfPath = "output.pdf";

        try {
            convertImagesToPdf(imagePaths, outputPdfPath);
            System.out.println("PDF created successfully!");
        } catch (IOException e) {
            System.err.println("Error: " + e.getMessage());
        }
    }

    public static void convertImagesToPdf(String[] imagePaths, String outputPdfPath) throws IOException {
        try {
            PDDocument document = new PDDocument();

            for (String imagePath : imagePaths) {
                PDImageXObject pdImage = PDImageXObject.createFromFile(imagePath, document);
                PDPage page = new PDPage();
                document.addPage(page);

                // 获取页面的宽度和高度
                float pageWidth = page.getMediaBox().getWidth();
                float pageHeight = page.getMediaBox().getHeight();

                // 获取图片的宽度和高度
                float imgWidth = pdImage.getWidth();
                float imgHeight = pdImage.getHeight();

                // 计算比例以适应页面
                float scale = Math.min(pageWidth / imgWidth, pageHeight / imgHeight);

                // 计算新的图像尺寸
                float newWidth = imgWidth * scale;
                float newHeight = imgHeight * scale;

                // 使用 PDPageContentStream 来绘制图像
                try (PDPageContentStream contentStream = new PDPageContentStream(document, page)) {
                    contentStream.drawImage(pdImage, (pageWidth - newWidth) / 2+60, (pageHeight - newHeight) / 2+60, newWidth-120, newHeight-120);
                }
            }

            // 保存文档
            document.save(outputPdfPath);
            // 关闭文档
            document.close();
        } catch (IOException e) {
            System.err.println("Error: " + e.getMessage());
        }
    }
}

2. Flying Saucer (XHTML/CSS to PDF)

Flying Saucer 是一个用于将 XHTML 和 CSS 渲染为 PDF 的库。

添加依赖

<dependency>
    <groupId>org.xhtmlrenderer</groupId>
    <artifactId>flying-saucer-core</artifactId>
    <version>1.1.20</version>
</dependency>
<dependency>
    <groupId>org.xhtmlrenderer</groupId>
    <artifactId>flying-saucer-pdf</artifactId>
    <version>1.1.20</version>
</dependency>

示例代码（如果图片展示有问题，可以调整图片宽高）

import org.xhtmlrenderer.pdf.ITextRenderer;
import org.xhtmlrenderer.pdf.ITextUserAgent;

import java.io.File;
import java.io.FileOutputStream;

public class HtmlToPdf {

    public static void main(String[] args) {
        String html = "<html><body><img src='path/to/image1.jpg' width="500" height="800"/></body></html>";
        String outputPdfPath = "output.pdf";

        try (FileOutputStream os = new FileOutputStream(new File(outputPdfPath))) {
            ITextRenderer renderer = new ITextRenderer();
            renderer.setDocumentFromString(html);
            renderer.layout();
            renderer.createPDF(os);
            System.out.println("PDF created successfully!");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

3.PDF 中的图转图

public  static void pfd2Image(){
        try {
            PDDocument document = PDDocument.load(new File("output23.pdf"));
            PDFRenderer pdfRenderer = new PDFRenderer(document);

            for (int page = 0; page < document.getNumberOfPages(); ++page) {
                BufferedImage bim = pdfRenderer.renderImageWithDPI(page, 300);
                ImageIO.write(bim, "PNG", new File("output_page_" + (page + 1) + ".png"));
            }

            document.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }