对一篇英文文章，统计各字符出现次数，实现Huffman编码。在Huffman编码后，将编码表和英文文章编码结果保存到文件中，并提供读编码文件生成原文件的功能。-Of an English article, statistics of the number of characters appear, realize Huffman coding. In the Huffman encoded, the encoding table and English article coding results saved to file, and to provide time code file generation function of the original document.