主要实现的功能是：任意输入一字符串，可以是任意的字符，包括标点符号，空格，以及键盘上能输入的所以字符。任意确定一个关键字符，统计该关键字符在字符串中出现的次数！ -Main function is to: a string of arbitrary input can be arbitrary characters, including punctuation, spaces, and the keyboard to input characters so. Arbitrarily defi

在使用Hadoop Streaming时，自己定义的Inputformat，实现Map的输入<key,value>,key为文件名,value为文档的整篇内容。-Using the self design inputformat to make the filename as the key and the whole content as the key in the Map Input come true while do the MapReduce program with h