今天想把张图片转成pdf，但是w某s收费，在网上找了一些在线转的也需要注册登录很麻烦，就直接搞了个程序跑跑，话不多说 开干！
本地图片转成PDF
添加依赖
<dependency>
<groupId>org.apache.pdfbox</groupId>
<artifactId>pdfbox</artifactId>
<version>2.0.24</version>
</dependency>
/**
* 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) {
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){
LogUtil.error(log,"pdf下载失败,imgFilePath:{},filePath:{}",imgFilePath,filePath,e);
}
}
/**
* 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;
}
图片url转成pdf并保存到本地
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import org.apache.commons.io.IOUtils;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.PDPageContentStream;
import org.apache.pdfbox.pdmodel.graphics.image.PDImageXObject;
public class ImageToPdfConverter {
public static void main(String[] args) throws IOException {
// 1. 下载你的图片转成字节
String imageUrl = "/";
byte[] imageBytes = downloadImage(imageUrl);
// 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();
}
private static byte[] downloadImage(String imageUrl) throws IOException {
HttpClient httpClient = HttpClientBuilder.create().build();
HttpGet httpGet = new HttpGet(imageUrl);
HttpResponse response = httpClient.execute(httpGet);
HttpEntity entity = response.getEntity();
InputStream inputStream = entity.getContent();
byte[] imageBytes = IOUtils.toByteArray(inputStream);
inputStream.close();
return imageBytes;
}
}
本地指定文件夹下所有的图片转换成pdf
这里提供获取某个文件夹下所有的图片并转成List<byte[]>的方法，具体实现无非就是把上面的循环
/**
* 得到img字节列表
*
* @param filePath 文件路径
* @return {@link List}<{@link byte[]}>
*/
private static List<byte[]> getImgByteList(String filePath) throws IOException {
// 转换
List<byte[]> imageBytesList = new ArrayList<>();
File folder = new File(filePath);
File[] files = folder.listFiles();
for (File file : files) {
if (file.isFile() && isImage(file)) {
byte[] imageBytes = convertImageToBytes(file);
imageBytesList.add(imageBytes);
}
}
return imageBytesList;
}
private static boolean isImage(File file) {
String fileName = file.getName().toLowerCase();
return fileName.endsWith(".jpg") || fileName.endsWith(".jpeg") ||
fileName.endsWith(".png") || fileName.endsWith(".gif") ||
fileName.endsWith(".bmp");
}
private static byte[] convertImageToBytes(File file) throws IOException {
BufferedImage image = ImageIO.read(file);
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
ImageIO.write(image, "jpg", outputStream);
return outputStream.toByteArray();
}