释放双眼，带上耳机，听听看~！
CRF分类器
参考：https://nlp.stanford.edu/nlp/javadoc/javanlp/edu/stanford/nlp/ie/crf/CRFClassifier.html
各种工具包
https://www.cnblogs.com/aeexiaoqiang/p/6531784.html
https://nlp.stanford.edu/nlp/javadoc/javanlp/
3.java实现TF-IDF
https://blog.csdn.net/sinat_18091513/article/details/79432754
4.coreNLP-java使用（中文）
https://www.jianshu.com/p/77c29af0c574
