java使用itext按頁碼拆分pdf文件

java使用itext按頁碼拆分pdf文件，代碼實現如下：

/**


@author viralpatel.net

@param inputStream Input PDF file
@param outputStream Output PDF file
@param fromPage start page from input PDF file
@param toPage end page from input PDF file
*/
public static void splitPDF(InputStream inputStream,

 OutputStream outputStream, int fromPage, int toPage) {

Document document = new Document();
 try {

 PdfReader inputPDF = new PdfReader(inputStream);

 int totalPages = inputPDF.getNumberOfPages();

 //make fromPage equals to toPage if it is greater
 if(fromPage > toPage ) {
     fromPage = toPage;
 }
 if(toPage > totalPages) {
     toPage = totalPages;
 }

 // Create a writer for the outputstream
 PdfWriter writer = PdfWriter.getInstance(document, outputStream);

 document.open();
 PdfContentByte cb = writer.getDirectContent(); // Holds the PDF data
 PdfImportedPage page;

 while(fromPage <= toPage) {
     document.newPage();
     page = writer.getImportedPage(inputPDF, fromPage);
     cb.addTemplate(page, 0, 0);
     fromPage++;
 }
 outputStream.flush();
 document.close();
 outputStream.close();

} catch (Exception e) {

 e.printStackTrace();

} finally {

 if (document.isOpen())
     document.close();
 try {
     if (outputStream != null)
         outputStream.close();
 } catch (IOException ioe) {
     ioe.printStackTrace();
 }

}
}</pre> 

 
 使用示例如下,將一個20頁的pdf文件拆分成1-12和13-20頁兩個pdf文件： 
 
public static void main(String[] args) {
 try {


 MergePDF.splitPDF(new FileInputStream("C:\\input.pdf"), 
             new FileOutputStream("C:\\output1.pdf"), 1, 12);
 MergePDF.splitPDF(new FileInputStream("C:\\input.pdf"), 
             new FileOutputStream("C:\\output2.pdf"), 13, 20);


} catch (Exception e) {

 e.printStackTrace();

}
}</pre>