效果图
直接上代码
1.引入jar
<dependency>
<groupId>org.apache.pdfbox</groupId>
<artifactId>pdfbox</artifactId>
<version>2.0.24</version>
</dependency>
2.测试类
package pers.wwz.study.img2pdf20240507;
import org.apache.pdfbox.io.IOUtils;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.PDPageContentStream;
import org.apache.pdfbox.pdmodel.common.PDRectangle;
import org.apache.pdfbox.pdmodel.graphics.image.PDImageXObject;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
public class Test {
public static void main(String[] args) {
downloadPdf("6.jpg","1.pdf");
}
/**
* 下载
*
* @param imgFilePath img文件路径
* @param filePath 文件路径
* @throws IOException ioexception
*/
private static void downloadPdf( String imgFilePath,String filePath) {
PDDocument document = new PDDocument();
try {
// 1.将本地的图片转成流形式
File imgFile = new File("6.jpg");
byte[] imageBytes = readBytesFromFile(imgFile);
File imgFile2 = new File("7.jpg");
byte[] imageBytes2 = readBytesFromFile(imgFile2);
File imgFile3 = new File("10.jpg");
byte[] imageBytes3 = readBytesFromFile(imgFile3);
// 2. 生成PDF
genPdf(document, imageBytes);
genPdf(document, imageBytes2);
genPdf(document, imageBytes3);
// 4. 保存PDF
File outputFile = new File(filePath);
File parentFolder = outputFile.getParentFile();
if (parentFolder != null && !parentFolder.exists()) {
parentFolder.mkdirs();
}
document.save(outputFile);
document.close();
}catch (Exception e){
}
}
private static void genPdf(PDDocument document, byte[] imageBytes) throws IOException {
//2. 生成一页 PDF document
PDImageXObject image = PDImageXObject.createFromByteArray(document, imageBytes, "image");
// 这里是你生成PDF自适应图片大小，不设置会默认为A4
PDRectangle pageSize = new PDRectangle(image.getWidth(), image.getHeight());
PDPage page = new PDPage(pageSize);
document.addPage(page);
// 3.将 图片 添加进PDF document
PDPageContentStream contentStream = new PDPageContentStream(document, page);
float pageWidth = pageSize.getWidth();
float pageHeight = pageSize.getHeight();
float imageWidth = image.getWidth();
float imageHeight = image.getHeight();
float scale = Math.min(pageWidth / imageWidth, pageHeight / imageHeight);
float scaledWidth = imageWidth * scale;
float scaledHeight = imageHeight * scale;
float x = (pageWidth - scaledWidth) / 2;
float y = (pageHeight - scaledHeight) / 2;
// 这里是将你的图片填充入pdf页
contentStream.drawImage(image, x, y, scaledWidth, scaledHeight);
contentStream.close();
}
/**
* 从文件读取字节
*
* @param file 文件
* @return {@link byte[]}
* @throws IOException ioexception
*/
private static byte[] readBytesFromFile(File file) throws IOException {
FileInputStream inputStream = new FileInputStream(file);
byte[] bytes = IOUtils.toByteArray(inputStream);
inputStream.close();
return bytes;
}
}