如何打印一个单词的重复次数

Question

我想做的是写一个词并搜索在哪个文件中找到该词以及它包含它的次数

示例：

狗这个词出现在：

file1.html - 2
file6.hmtl - 8
file25.html - 5

目前我有这个，它只显示文件名但不显示重复次数。

欢迎任何帮助。

public static void main(String[] args) throws FileNotFoundException {

        File dir = new File("/Users/Adan/Desktop/Files/"); // directory = target directory.

        if(dir.exists()){ // Directory exists then proceed.

            Pattern p = Pattern.compile("casa"); // keyword = keyword to search in files.
            ArrayList<String> list = new ArrayList<String>(); // list of files.

            System.out.println("La palabra " + p + " esta dentro de estos archivos:");


            for(File f : dir.listFiles()){
                if(!f.isFile()){

                    continue;
                }
                try
                {

                    FileInputStream fis = new FileInputStream(f);
                    byte[] data = new byte[fis.available()];
                    fis.read(data);
                    String text = new String(data);
                    Matcher m = p.matcher(text);
                    if(m.find()){
                        list.add(f.getName()); // add file to found-keyword list.

                    }

                    fis.close();
                } 
                catch(Exception e){

                System.out.println("\n\t Error processing file : "+f.getName());
                }

            }
            for (String listado : list) { 
                System.out.println(listado);//Lista
            }
        } // IF directory exists then only process.
        else{
            System.out.println("\n Directory doesn't exist.");
        }
    } 
}

Answer 1

public static void main(String[] args) throws FileNotFoundException {

    File dir = new File("D:/test2"); // directory = target directory.

    if (dir.exists()) { // Directory exists then proceed.

        Pattern p = Pattern.compile("sd4"); // keyword = keyword to search in files.
        Map<String, Long> occurences = new HashMap<>(); // list of files.

        System.out.println("La palabra " + p + " esta dentro de estos archivos:");


        for (File f : dir.listFiles()) {
            if (!f.isFile()) {

                continue;
            }
            try {

                FileInputStream fis = new FileInputStream(f);
                byte[] data = new byte[fis.available()];
                fis.read(data);
                String text = new String(data);
                Matcher m = p.matcher(text);
                while (m.find()) { //use while instead of if
                    occurences.put(f.getName(), occurences.getOrDefault(f.getName(), 0L) + 1); // add file to found-keyword list.
                }

                fis.close();
            } catch (Exception e) {

                System.out.println("\n\t Error processing file : " + f.getName());
            }

        }
        occurences.forEach((file, numberOfOccurrences) -> {
            System.out.println("In the file [" + file + "] the word occurs : " + numberOfOccurrences + " times");
        });
    } // IF directory exists then only process.
    else {
        System.out.println("\n Directory doesn't exist.");
    }
}

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