java使用itext按页码拆分pdf文件详解编程语言

java使用itext按页码拆分pdf文件，代码实现如下：

/** 
 * @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(); 
        } 
    } 
}

使用示例如下,将一个20页的pdf文件拆分成1-12和13-20页两个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(); 
    } 
}