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我搜索了一个免费的 Java 库来分析商业程序中的 pdf。
哪个是通过计算不同的单词和检测标题在 pdf 中进行数据挖掘的更好的库？
PDFBox is going to be a great Java Library for PDFs. Currently, the latest version is not stable yet, by provides great solutions. The documentation is cute, so if you want to do easy stuff, you won't waste too much time for learning.