最近有个朋友问我有没有免费的图片转PDF格式的软件,我在网上找了很久,发现几乎全部都要收费的,无奈之下,我只要利用自己的特长,用java代码来实现图片转PDF格式的功能,话不多说,立即上代码:
/**
*
* @param imgFilePath img文件路径
* @param filePath 文件路径
* @throws IOException ioexception
*/
private static void downloadPdf(String imgFilePath, String filePath) {
try {
// 1.将本地的图片转成流形式
File imgFile = new File(imgFilePath);
byte[] imageBytes = readBytesFromFile(imgFile);
// 2. 生成一页 PDF document
PDDocument document = new PDDocument();
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();
// 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) {
e.printStackTrace();
}
}
/**
* 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;
}
注:代码中只需要用到一个jar包,导入jar包后直接在eclipse或者其他java开发工具上运行即可,jar包下载地址:https://dlcdn.apache.org/pdfbox/3.0.2/pdfbox-app-3.0.2.jar