Java中旋转PDF页面的三种实现方法指南

<repositories>
    <repository>
        <id>com.e-iceblue</id>
        <name>e-iceblue</name>
        <url>https://repo.e-iceblue.cn/repository/maven-public/</url>
    </repository>
</repositories>
<dependencies>
    <dependency>
        <groupId>e-iceblue</groupId>
        <artifactId>spire.pdf</artifactId>
        <version>11.12.16</version>
    </dependency>
</dependencies>

import com.spire.pdf.PdfDocument;
import com.spire.pdf.PdfPageBase;
import com.spire.pdf.PdfPageRotateAngle;

public class RotatePdfPage {
    public static void main(String[] args) {
        PdfDocument pdf = new PdfDocument();
        pdf.loadFromFile("Sample.pdf");

        PdfPageBase page = pdf.getPages().get(0);
        int rotation = page.getRotation().getValue();

        rotation += PdfPageRotateAngle.Rotate_Angle_180.getValue();
        page.setRotation(PdfPageRotateAngle.fromValue(rotation));

        pdf.saveToFile("Rotate.pdf");
        System.out.println("第一页旋转完成！");
    }
}

for (int i = 0; i < pdf.getPages().getCount(); i++) {
    PdfPageBase page = pdf.getPages().get(i);
    int rotation = page.getRotation().getValue();
    rotation += PdfPageRotateAngle.Rotate_Angle_90.getValue(); // 旋转 90°
    page.setRotation(PdfPageRotateAngle.fromValue(rotation));
}

import java.util.Scanner;
import com.spire.pdf.PdfDocument;
import com.spire.pdf.PdfPageBase;
import com.spire.pdf.PdfPageRotateAngle;

public class DynamicRotate {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        System.out.print("请输入 PDF 文件路径：");
        String filePath = scanner.nextLine();

        System.out.print("请输入旋转角度（90,180,270）：");
        int angle = scanner.nextInt();

        System.out.print("请输入要旋转的页面范围（如 1-3 或 all）：");
        String pageRange = scanner.next();

        PdfDocument pdf = new PdfDocument();
        pdf.loadFromFile(filePath);

        int startPage = 0, endPage = pdf.getPages().getCount() - 1;
        if (!pageRange.equalsIgnoreCase("all")) {
            String[] parts = pageRange.split("-");
            startPage = Integer.parseInt(parts[0]) - 1;
            endPage = Integer.parseInt(parts[1]) - 1;
        }

        for (int i = startPage; i <= endPage; i++) {
            PdfPageBase page = pdf.getPages().get(i);
            int rotation = page.getRotation().getValue();
            rotation += angle;
            page.setRotation(PdfPageRotateAngle.fromValue(rotation));
        }

        pdf.saveToFile("RotatedOutput.pdf");
        System.out.println("指定页面旋转完成！");
    }
}