Java操纵PDF汇总
各种java pdf类库说明
http://www.blogjava.net/security/archive/2006/05/23/read_pdf_java_library.html

iText的弱点:
http://pridesnow.iteye.com/blog/561953

有比较准确的数据,说明
用xpdf和pdfbox来处理中文PDF文档及其比较
http://emily2ly.iteye.com/blog/743552


Java操作PDF文件（BFO）


http://xiaoduan.blog.51cto.com/502137/138339


http://www.iteye.com/topic/509417


http://www.iteye.com/wiki/problem/17385




几种开源的pdf类库




iText
gnujpdf
FOP
JFreeReport
PJX
JPedal
PDFjet
PDF Clown for Java (PDF
Jester)
jPod
PDF Renderer



各种语言开源的pdf库:
http://blog.csdn.net/xuqianghit/article/details/6089268