Java实现将PDF转为图片格式的方法详解

<repositories>

        <repository>

            <id>com.e-iceblue</id>

            <url>https://repo.e-iceblue.cn/repository/maven-public/</url>

        </repository>

    </repositories>

<dependencies>

    <dependency>

        <groupId>e-iceblue</groupId>

        <artifactId>spire.pdf.free</artifactId>

        <version>5.1.0</version>

    </dependency>

</dependencies>

import com.spire.pdf.*;
import com.spire.pdf.graphics.PdfImageType;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

public class PDFtoImage {
    public static void main(String[] args)throws IOException {
        //实例化PdfDocument类的对象
        PdfDocument pdf = new PdfDocument();

        //加载PDF文档
        pdf.loadFromFile("都江堰.pdf");

        //遍历PDF每一页，保存为图片
        for (int i = 0; i < pdf.getPages().getCount(); i++) {
            //将页面保存为图片，并设置DPI分辨率
            BufferedImage image = pdf.saveAsImage(i, PdfImageType.Bitmap,500,500);
            //将图片保存为png格式
            File file = new File( String.format(("ToImage-img-%d.png"), i));
            ImageIO.write(image, "PNG", file);
        }
        pdf.close();
    }
}

import com.spire.pdf.*;
import com.spire.pdf.graphics.PdfImageType;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

public class PDFtoImage {
    public static void main(String[] args) throws IOException {
        //创建PdfDocument类的实例
        PdfDocument pdf = new PdfDocument();

        //加载PDF文档
        pdf.loadFromFile("都江堰.pdf");

        //将PDF第1页保存为图片，并设置图片DPI分辨率
        BufferedImage image= pdf.saveAsImage(0, PdfImageType.Bitmap,500,500);

        //保存为png格式
        ImageIO.write(image, "PNG", new File("ToPNG.png"));
    }
}