引入pdfbox使用的jar

pdfbox-2.0.8.jar，maven依赖如图：

org.apache.pdfbox

pdfbox

2.0.8

切图：按页切图并生成对应的png格式的图片，输出至相应的目录下

/**

* pdf切割成图片

* @param url1 //源文件路径

* @param url2 //切割后图片存储路径

* @param contractId//合同模板id

* @throws IOException

*/

public static void cutting(String url1, String url2, String contractId) throws IOException{

//将pdf按页生成图片

File file = new File(url1);

Rectangle tempReader = null;

PdfReader pdfReader = null;

PDDocument doc = null;

try {

String urls = url2+contractId+"/";

File files = new File(urls);

if(!files.exists()){

files.mkdirs();

}

// 读入PDF

pdfReader = new PdfReader(url1);

// 计算PDF页码数

int pageCount = pdfReader.getNumberOfPages();

System.out.println(pageCount);

doc = PDDocument.load(file);

PDFRenderer renderer = new PDFRenderer(doc);

// 循环每个页码

for (int i = 1; i <= pdfReader.getNumberOfPages(); i++)

{

tempReader = pdfReader.getPageSize(i);

int height = (int)tempReader.getHeight();

int width = (int)tempReader.getWidth();

System.out.println(height+"..."+width);

BufferedImage image = renderer.renderImageWithDPI(i-1, 96); // Windows native DPI

BufferedImage tempImage = resize(image,width,height);

ImageIO.write(tempImage, "PNG", new File(urls+contractId+"_"+i+".png"));

}

} catch (IOException e) {

e.printStackTrace();

}finally{

if(null!=doc){

doc.close();

}

if(null!=pdfReader){

pdfReader.close();

}

}

}

调用重绘图片方法resize(image,width,height)

//限制pdf转换成图片时的大小

private static BufferedImage resize(BufferedImage source, int targetW, int targetH) {

int type=source.getType();

BufferedImage target=null;

double sx=(double)targetW/source.getWidth();

double sy=(double)targetH/source.getHeight();

if(sx>sy){

sx=sy;

targetW=(int)(sx*source.getWidth());

}else{

sy=sx;

targetH=(int)(sy*source.getHeight());

}

if(type==BufferedImage.TYPE_CUSTOM){

ColorModel cm=source.getColorModel();

WritableRaster raster=cm.createCompatibleWritableRaster(targetW, targetH);

boolean alphaPremultiplied=cm.isAlphaPremultiplied();

target=new BufferedImage(cm,raster,alphaPremultiplied,null);

}else{

target=new BufferedImage(targetW, targetH,type);

}

Graphics2D g=target.createGraphics();

g.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);

g.drawRenderedImage(source, AffineTransform.getScaleInstance(sx, sy));

g.dispose();

return target;

}