JAVA文件扫描，递归

import java.io.File;

public class Scan {
    public static void main(String[] args) {
        String fileName = "D:\\Program Files\\腾讯游戏\\英雄联盟" + File.separator;
        File f = new File(fileName);
        scan(f);
    }

    public static void scan(File f) {
        if (f != null) {
            if (f.isDirectory()) {
                File[] fileArray = f.listFiles();
                if (fileArray != null) {
                    for (int i = 0; i < fileArray.length; i++) {
                        // 递归调用
                        scan(fileArray[i]);
                    }
                }
            } else {
                System.out.println(f);
            }
        }
    }
}

扫描了“D:\\Program Files\\腾讯游戏\\英雄联盟”中的所有文件

而下面这个可以进行文件的扫描和读取

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;

public class TextReader {
    public static void main(String[] args) {
        String fileName = "E:\\JavaWorkSpace\\Workspaces\\eclipse" + File.separator;
        File f = new File(fileName);
        scan(f);
    }

    public static void scan(File f) {
        if (f != null) {
            if (f.isDirectory()) {
                File[] fileArray = f.listFiles();
                if (fileArray != null) {
                    for (int i = 0; i < fileArray.length; i++) {
                        // 递归调用
                        scan(fileArray[i]);
                    }
                }
            } else {

                if ((f.getName().substring(f.getName().lastIndexOf(".") + 1, f
                        .getName().length())).equals("java")) {
                    FileReader reader;
                    try {
                        Thread.sleep(3000);
                        reader = new FileReader(f);
                        BufferedReader Bufferedreader = new BufferedReader(
                                reader);
                        String content = "";
                        while ((content = Bufferedreader.readLine()) != null) {
                            System.out.println(content);
                        }
                    } catch (Exception e) {
                        // TODO Auto-generated catch block
                    }

                }
            }
        }
    }
}

扫描了”E:\\JavaWorkSpace\\Workspaces\\eclipse“中所有的.java文件，并进行了文件的读取和输出