代碼

 /**
         * 統(tǒng)計(jì)給定文件中給定字符串的出現(xiàn)次數(shù)
         * @param filename 文件名
         * @param word 字符串
         * @return 字符串在文件中出現(xiàn)的次數(shù)
         */
        public static int countWordInFile(String filename, String word) {
            int counter = 0;
            try (FileReader fr = new FileReader(filename)) {
                try (BufferedReader br = new BufferedReader(fr)) {
                    String line = null;
                    while ((line = br.readLine()) != null) {
                        int index = -1;
                        while (line.length() >= word.length() && (index =
                                line.indexOf(word)) >= 0) {
                            counter++;
                            line = line.substring(index + word.length());
                        }
                    }
                }
            } catch (Exception ex) {
                ex.printStackTrace();
            }
            return counter;
        }