转 Java将PDF转换成图片

这里介绍两种将PDF转换成图片的方式

一、使用icepdf

     下载导入jar包，jar包地址：http://download.csdn.net/download/u010782875/10041519

      代码实现：

import java.awt.image.BufferedImage;
import java.awt.image.RenderedImage;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import javax.imageio.ImageIO;

import org.icepdf.core.pobjects.Document;
import org.icepdf.core.util.GraphicsRenderingHints;

/**
* @ClassName:PdfToImageIcePdf
* @Description:
* @author:
* @data:2017/10/25
*/
public class PdfToImageIcePdf {
public static void main(final String[] args) {
String filePath = "D://Test/xxx.pdf"
List<String> imageList = getPdfToImage(filePath);
Iterator<String> iterator = imageList.iterator();
while(iterator.hasNext()){
System.out.println(iterator.next());
}
}
//返回生成图片的路径
public static List<String> getPdfToImage(String filePath) {
String fileName = filePath.substring(0,filePath.lastIndexOf("."));//获取去除后缀的文件路径
List<String> list = new ArrayList<>();
String imagePath;
Document document = new Document();
try{
document.setFile(filePath);
}catch (Exception e){
e.printStackTrace();
}

float scale = 1.3f;// 缩放比例
float rotation = 0f;// 旋转角度

for (int i = 0; i < document.getNumberOfPages(); i++) {
BufferedImage image = (BufferedImage) document.getPageImage(i,
GraphicsRenderingHints.SCREEN,
org.icepdf.core.pobjects.Page.BOUNDARY_CROPBOX, rotation,
scale);
RenderedImage rendImage = image;
try {
int n = i + 1;
File f = new File(fileName);
if(!f.exists()){
f.mkdir();
}
imagePath = fileName + "/image"+ n + ".jpg";//生成图片的路径
File file = new File(imagePath);
ImageIO.write(rendImage, "jpg", file);
// 这里png作用是：格式是jpg但有png清晰度
// ImageIO.write(rendImage, "png", file);
list.add(imagePath);
} catch (IOException e) {
e.printStackTrace();
}
image.flush();
}
document.dispose();
return list;
}

         该方法在main（）可以正常运行，但是放入action中会报错 “Java.lang.NoClassDefFoundError:org/icepdf/core/util/content/b”

二、使用pdfbox

        下载导入jar包，jar包地址：http://download.csdn.net/download/u010782875/10041527

         代码实现：

import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.rendering.PDFRenderer;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

/**
* @ClassName:PdfToImagePdfBox
* @Description:
* @author:
* @data:2017/10/27
*/
public class PdfToImagePdfBox {
public static void main(String[] args){
String filePath = "D://Test/xxx.pdf";
List<String> imageList = pdfToImagePath(filePath);
Iterator<String> iterator = imageList.iterator();
while(iterator.hasNext()){

System.out.println(iterator.next());
}
// pdfToImage(filePath);
}
public static List<String> pdfToImagePath(String filePath){
List<String> list = new ArrayList<>();
String fileDirectory = filePath.substring(0,filePath.lastIndexOf("."));//获取去除后缀的文件路径

String imagePath;
File file = new File(filePath);
try {
File f = new File(fileDirectory);
if(!f.exists()){
f.mkdir();
}
PDDocument doc = PDDocument.load(file);
PDFRenderer renderer = new PDFRenderer(doc);
int pageCount = doc.getNumberOfPages();
for(int i=0; i<pageCount; i++){
// 方式1,第二个参数是设置缩放比(即像素)
// BufferedImage image = renderer.renderImageWithDPI(i, 296);
// 方式2,第二个参数是设置缩放比(即像素)
BufferedImage image = renderer.renderImage(i, 1.25f); //第二个参数越大生成图片分辨率越高，转换时间也就越长
imagePath = fileDirectory + "/"+i + ".jpg";
ImageIO.write(image, "PNG", new File(imagePath));
list.add(imagePath);
}
} catch (IOException e) {
e.printStackTrace();
}
return list;
}
该方法在action中可以正常运行