将PDF文件中按页截取,并以流的形势返回给客户端

#需要用到pyPdf库
from pyPdf import PdfFileWriter,PdfFileReader
from django.http import HttpResponse

try:
    from cStringIO import StringIO
except:
    from io import BytesIo as StringIo


def split_pdf(request):
    pdf_file = u'C:/Users/admin/Desktop/xxxx.pdf'
    page = 1 #返回的页码
    try:
        currentPage = int(page)
    except:pass

    pdfFile = file(pdf_file, 'rb')   #打开pdf

    pdf_input = PdfFileReader(pdfFile) #创建对象
    #获取当前PDF的总页数
    pageCount = pdf_input.getNumPages()

    if currentPage:
        if currentPage < 0 or currentPage >pageCount:
            currentPage = 1
        #获取指定PDF指定页面,以流的形式返回给客户端
        out = StringIO()  # 获取管道
        p = PdfFileWriter()  #创建写入对象
        p.addPage(pdf_input.getPage(currentPage))  #将当前页对象添加到创建的pdf最后面
        p.write(out) #将pdf写入流 

        out.seek(0) #移动文件指针到第0个位置
        response = HttpResponse(content_type='application/pdf')  
        response.write(out.read())
        return response