c# iText中文教程，讲解十分详细，看了以后同样可以使用java来编写，语法类似的-c# iText English tutorial, explaining in great detail, having read the later can also use java to write, syntax similar

itext的api 版本：5.1.1，格式：chm。-itext api to version: 5.1.1, format: chm