Java 环境下用 PDFBox 实现 PDF 文档转换 JPG 图片的功能

package com.sunbloger.pdf2jpg.controller;

import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;

import javax.imageio.ImageIO;

import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.rendering.PDFRenderer;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
@RequestMapping(value = "/japi")
public class render {

    @RequestMapping(value = "/convert", method = RequestMethod.GET)
    public @ResponseBody Map<String, Object> convert () throws Exception
    {
        Map<String, Object> responseMap = new HashMap<String, Object>();
        
        PDDocument doc = null;
        InputStream stream = null;
        FileOutputStream fos = null;
        ByteArrayOutputStream baos = null;
        
        try {

            // 读入 PDF 文件
            stream = new FileInputStream("D:\\workspace-springboot\\1.pdf");
            doc = PDDocument.load(stream);

            // 渲染
            PDFRenderer pdfRenderer = new PDFRenderer(doc);
            BufferedImage bufferedImage = pdfRenderer.renderImageWithDPI(0, 300);
            pdfRenderer = null;

            // 写入 JPG 文件
            baos = new ByteArrayOutputStream();
            ImageIO.write(bufferedImage, "jpg", baos);
            byte[] dataList = baos.toByteArray();
            baos = null;
            File file = new File("D:\\workspace-springboot\\1.jpg");
            fos = new FileOutputStream(file);
            fos.write(dataList);
            fos.close();
            fos = null;
            file = null;
            responseMap.put("suc", 1);
            responseMap.put("info", "convert sucess.");
        } catch (Exception e) {
            throw e;
        }
        
        return responseMap;
    }
}

<dependency>
    <groupId>org.apache.pdfbox</groupId>
    <artifactId>pdfbox</artifactId>
    <version>2.0.27</version>
</dependency>