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将PDF每一页切割成图片
PDFUtils.cutPNG("D:/tmp/1.pdf","D:/tmp/输出图片路径/");
将PDF转换成一张长图片
PDFUtils.transition_ONE_PNG("D:/tmp/1.pdf");
将多张图片合并成一个PDF文件
PDFUtils.merge_PNG("D:/tmp/测试图片/");
将多个PDF合并成一个PDF文件
PDFUtils.merge_PDF("D:/tmp/测试图片/");
取出指定PDF的起始和结束页码作为新的pdf
PDFUtils.getPartPDF("D:/tmp/1.pdf",3,5);
- <!-- apache PDF转图片-->
- <dependency>
- <groupId>org.apache.pdfbox</groupId>
- <artifactId>pdfbox</artifactId>
- <version>2.0.24</version>
- </dependency>
- <!-- itext 图片合成PDF-->
- <dependency>
- <groupId>com.itextpdf</groupId>
- <artifactId>itextpdf</artifactId>
- <version>5.5.13.2</version>
- </dependency>
PDFUtils.java
- import com.itextpdf.text.Document;
- import com.itextpdf.text.DocumentException;
- import com.itextpdf.text.Image;
- import com.itextpdf.text.pdf.*;
- import org.apache.pdfbox.io.MemoryUsageSetting;
- import org.apache.pdfbox.multipdf.PDFMergerUtility;
- import org.apache.pdfbox.multipdf.Splitter;
- import org.apache.pdfbox.pdmodel.PDDocument;
- import org.apache.pdfbox.pdmodel.PDPage;
- import org.apache.pdfbox.pdmodel.PDResources;
- import org.apache.pdfbox.pdmodel.common.PDRectangle;
- import org.apache.pdfbox.rendering.ImageType;
- import org.apache.pdfbox.rendering.PDFRenderer;
-
- import javax.imageio.ImageIO;
- import java.awt.image.BufferedImage;
- import java.io.File;
- import java.io.FileOutputStream;
- import java.io.FilenameFilter;
- import java.io.IOException;
- import java.util.ArrayList;
- import java.util.List;
-
- /**
- * pdf工具类
- */
- public class PDFUtils {
-
-
- /**
- * PDF分解图片文件
- *
- * @param pdfPath pdf文件路径
- */
- public static void cutPNG(String pdfPath) throws IOException {
- File pdf = new File(pdfPath);
- cutPNG(pdfPath, pdf.getParent() + File.separator + pdf.getName() + "_pngs");
- }
-
- /**
- * PDF分解图片文件
- *
- * @param pdfPath pdf文件路径
- * @param outPath 输出文件夹路径
- */
- public static void cutPNG(String pdfPath, String outPath) throws IOException {
- File outDir = new File(outPath);
- if (!outDir.exists()) outDir.mkdirs();
- cutPNG(new File(pdfPath), outDir);
- }
-
- /**
- * PDF分解图片文件
- *
- * @param pdf pdf文件
- * @param outDir 输出文件夹
- */
- public static void cutPNG(File pdf, File outDir) throws IOException {
- LogUtils.info("PDF分解图片工作开始");
- List<BufferedImage> list = getImgList(pdf);
- LogUtils.info(pdf.getName() + " 一共发现了 " + list.size() + " 页");
- FileUtils.cleanDir(outDir);
- for (int i = 0; i < list.size(); i++) {
- IMGUtils.saveImageToFile(list.get(i), outDir.getAbsolutePath() + File.separator + (i + 1) + ".png");
- LogUtils.info("已保存图片:" + (i + 1) + ".png");
- }
- LogUtils.info("PDF分解图片工作结束,一共分解出" + list.size() + "个图片文件,保存至:" + outDir.getAbsolutePath());
- }
-
- /**
- * 将pdf文件转换成一张图片
- *
- * @param pdfPath pdf文件路径
- */
- public static void transition_ONE_PNG(String pdfPath) throws IOException {
- transition_ONE_PNG(new File(pdfPath));
- }
-
- /**
- * 将pdf文件转换成一张图片
- *
- * @param pdf pdf文件
- */
- public static void transition_ONE_PNG(File pdf) throws IOException {
- LogUtils.info("PDF转换长图工作开始");
- List<BufferedImage> list = getImgList(pdf);
- LogUtils.info(pdf.getName() + " 一共发现了 " + list.size() + " 页");
- BufferedImage image = list.get(0);
- for (int i = 1; i < list.size(); i++) {
- image = IMGUtils.verticalJoinTwoImage(image, list.get(i));
- }
- byte[] data = IMGUtils.getBytes(image);
- String imgPath = pdf.getParent() + File.separator + pdf.getName().replaceAll("\\.", "_") + ".png";
- FileUtils.saveDataToFile(imgPath, data);
- LogUtils.info("PDF转换长图工作结束,合成尺寸:" + image.getWidth() + "x" + image.getHeight() + ",合成文件大小:" + data.length / 1024 + "KB,保存至:" + imgPath);
- }
-
-
- /**
- * 将PDF文档拆分成图像列表
- *
- * @param pdf PDF文件
- */
- private static List<BufferedImage> getImgList(File pdf) throws IOException {
- PDDocument pdfDoc = PDDocument.load(pdf);
- List<BufferedImage> imgList = new ArrayList<>();
- PDFRenderer pdfRenderer = new PDFRenderer(pdfDoc);
- int numPages = pdfDoc.getNumberOfPages();
- for (int i = 0; i < numPages; i++) {
- BufferedImage image = pdfRenderer.renderImageWithDPI(i, 300, ImageType.RGB);
- imgList.add(image);
- }
- pdfDoc.close();
- return imgList;
- }
-
- /**
- * 图片合成PDF
- *
- * @param pngsDirPath 图片文件夹路径
- */
- public static void merge_PNG(String pngsDirPath) throws Exception {
- File pngsDir = new File(pngsDirPath);
- merge_PNG(pngsDir, pngsDir.getName() + ".pdf");
- }
-
- /**
- * 图片合成pdf
- *
- * @param pngsDir 图片文件夹
- * @param pdfName 合成pdf名称
- */
- private static void merge_PNG(File pngsDir, String pdfName) throws Exception {
- File pdf = new File(pngsDir.getParent() + File.separator + pdfName);
- if (!pdf.exists()) pdf.createNewFile();
- File[] pngList = pngsDir.listFiles((dir, name) -> name.toLowerCase().endsWith(".png"));
- LogUtils.info("在" + pngsDir.getAbsolutePath() + ",一共发现" + pngList.length + "个PNG文件");
- Document document = new Document();
- FileOutputStream fo = new FileOutputStream(pdf);
- PdfWriter writer = PdfWriter.getInstance(document, fo);
- document.open();
- for (File f : pngList) {
- document.newPage();
- byte[] bytes = FileUtils.getFileBytes(f);
- Image image = Image.getInstance(bytes);
- float heigth = image.getHeight();
- float width = image.getWidth();
- int percent = getPercent2(heigth, width);
- image.setAlignment(Image.MIDDLE);
- image.scalePercent(percent + 3);// 表示是原来图像的比例;
- document.add(image);
- System.out.println("正在合成" + f.getName());
- }
- document.close();
- writer.close();
- System.out.println("PDF文件生成地址:" + pdf.getAbsolutePath());
-
- }
-
-
- private static int getPercent2(float h, float w) {
- int p = 0;
- float p2 = 0.0f;
- p2 = 530 / w * 100;
- p = Math.round(p2);
- return p;
- }
-
- /**
- * 多PDF合成
- *
- * @param pngsDirPath pdf所在文件夹路径
- */
- public static void merge_PDF(String pngsDirPath) throws IOException {
- File pngsDir = new File(pngsDirPath);
- merge_PDF(pngsDir, pngsDir.getName() + "_合并.pdf");
- }
-
- /**
- * 多PDF合成
- *
- * @param pngsDir pdf所在文件夹
- * @param pdfName 合成pdf文件名
- */
- private static void merge_PDF(File pngsDir, String pdfName) throws IOException {
- File[] pdfList = pngsDir.listFiles((dir, name) -> name.toLowerCase().endsWith(".pdf"));
- LogUtils.info("在" + pngsDir.getAbsolutePath() + ",一共发现" + pdfList.length + "个PDF文件");
- PDFMergerUtility pdfMergerUtility = new PDFMergerUtility();
- pdfMergerUtility.setDestinationFileName(pngsDir.getParent() + File.separator + pdfName);
- for (File f : pdfList) {
- pdfMergerUtility.addSource(f);
- }
- pdfMergerUtility.mergeDocuments(MemoryUsageSetting.setupMainMemoryOnly());
- }
-
- public static void getPartPDF(String pdfPath, int from, int end) throws Exception {
- pdfPath = pdfPath.trim();
- Document document = null;
- PdfCopy copy = null;
- PdfReader reader = new PdfReader(pdfPath);
- int n = reader.getNumberOfPages();
- if (end == 0) {
- end = n;
- }
- document = new Document(reader.getPageSize(1));
- copy = new PdfCopy(document, new FileOutputStream(pdfPath.substring(0, pdfPath.length() - 4) + "_" + from + "_" + end + ".pdf"));
- document.open();
- for (int j = from; j <= end; j++) {
- document.newPage();
- PdfImportedPage page = copy.getImportedPage(reader, j);
- copy.addPage(page);
- }
- document.close();
- }
-
-
- }
IMGUtils.java
- import javax.imageio.ImageIO;
- import java.awt.*;
- import java.awt.image.BufferedImage;
- import java.io.ByteArrayInputStream;
- import java.io.ByteArrayOutputStream;
- import java.io.FileInputStream;
- import java.io.IOException;
-
- public class IMGUtils {
- /**
- * 将图像转为png文件的字节数据
- * @param image 目标图像
- * @return 返回数据
- */
- public static byte[] getBytes(BufferedImage image){
- return getBytes(image,"png");
- }
-
-
- /**
- * 将图像转换为指定媒体文件类型的字节数据
- * @param image 目标图像
- * @param fileType 文件类型(后缀名)
- * @return 返回数据
- */
- public static byte[] getBytes(BufferedImage image,String fileType){
- ByteArrayOutputStream outStream = new ByteArrayOutputStream();
- try {
- ImageIO.write(image,fileType,outStream);
- } catch (IOException e) {
- e.printStackTrace();
- }
- return outStream.toByteArray();
- }
-
- /**
- * 读取图像,通过文件
- * @param filePath 文件路径
- * @return BufferedImage
- */
- public static BufferedImage getImage(String filePath){
- try {
- return ImageIO.read(new FileInputStream(filePath));
- } catch (IOException e) {
- e.printStackTrace();
- }
- return null;
- }
-
- /**
- * 读取图像,通过字节数据
- * @param data 字节数据
- * @return BufferedImage
- */
- public static BufferedImage getImage(byte[] data){
- try {
- return ImageIO.read(new ByteArrayInputStream(data));
- } catch (IOException e) {
- e.printStackTrace();
- }
- return null;
- }
-
-
- /**
- * 保存图像到指定文件
- * @param image 图像
- * @param filePath 文件路径
- */
- public static void saveImageToFile(BufferedImage image,String filePath) throws IOException {
- FileUtils.saveDataToFile(filePath,getBytes(image));
- }
-
- /**
- * 纵向拼接图片
- */
- public static BufferedImage verticalJoinTwoImage(BufferedImage image1, BufferedImage image2){
- if(image1==null)return image2;
- if(image2==null)return image1;
- BufferedImage image=new BufferedImage(image1.getWidth(),image1.getHeight()+image2.getHeight(),image1.getType());
- Graphics2D g2d = image.createGraphics();
- g2d.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
- g2d.drawImage(image1, 0, 0, image1.getWidth(), image1.getHeight(), null);
- g2d.drawImage(image2, 0, image1.getHeight(), image2.getWidth(), image2.getHeight(), null);
- g2d.dispose();// 释放图形上下文使用的系统资源
- return image;
- }
-
-
- /**
- * 剪裁图片
- * @param image 对象
- * @param x 顶点x
- * @param y 顶点y
- * @param width 宽度
- * @param height 高度
- * @return 剪裁后的对象
- */
- public static BufferedImage cutImage(BufferedImage image,int x,int y,int width,int height){
- if(image==null)return null;
- return image.getSubimage(x,y,width,height);
- }
-
-
-
- }
FileUtils.java
- import java.io.*;
-
- public class FileUtils {
-
- /**
- * 将数据保存到指定文件路径
- */
- public static void saveDataToFile(String filePath,byte[] data) throws IOException {
- File file = new File(filePath);
- if(!file.exists())file.createNewFile() ;
- FileOutputStream outStream = new FileOutputStream(file);
- outStream.write(data);
- outStream.flush();
- outStream.close();
- }
-
- /**
- * 读取文件数据
- */
- public static byte[] getFileBytes(File file) throws IOException {
- if(!file.exists()||(file.exists()&&!file.isFile()))return null;
- InputStream inStream=new FileInputStream(file);
- ByteArrayOutputStream outStream = new ByteArrayOutputStream();
- byte[] buffer = new byte[1024];
- int len;
- while ((len = inStream.read(buffer)) != -1) {
- outStream.write(buffer, 0, len);
- }
- inStream.close();
- return outStream.toByteArray();
- }
-
- /**
- * 读取文本文件字
- */
- public static String getFileText(String path){
- try {
- byte[] data= getFileBytes(new File(path));
- return new String(data);
- } catch (Exception e) {
- return "";
- }
- }
-
- /**
- * 清空文件夹下所有文件
- */
- public static void cleanDir(File dir){
- if(dir!=null&&dir.isDirectory()){
- for(File file:dir.listFiles()){
- if(file.isFile())file.delete();
- if(file.isDirectory())cleanDir(file);
- }
- }
- }
-
-
- }
LogUtils.java
- public class LogUtils {
-
- public static void info(String context){
- System.out.println(context);
- }
-
- public static void warn(String context){
- System.out.println(context);
- }
-
- public static void error(String context){
- System.out.println(context);
- }
-
-
- }
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