Java实现文件夹下所有文件遍历搜索关键字

package a.xyz.laremehpe;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

public class Find {
    private static boolean flag = true;
    public static void main(String[] args) {
        try {
            find("register","E:\\Hbuilder-Content\\9.28拖车");
            if(flag)System.out.println("no result found!");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    
    public static void find(String words,String path) throws IOException {
        File[] f1 = new File(path).listFiles();
        for (int i = 0, len = f1.length; i < len; i++) {
            if (f1[i].isDirectory()) {
                find(words, f1[i].getAbsolutePath());
            }else {
                String article = readFromInputStream(f1[i].getAbsolutePath());
                if(article.indexOf(words) > -1) {
                    flag = false;
                    System.out.println(f1[i].getAbsolutePath());
                }
            }
        }
    }
    
    private static String readFromInputStream(String s) throws IOException {
        InputStream inputStream = new FileInputStream(new File(s));
        StringBuilder resultStringBuilder = new StringBuilder();
        try (BufferedReader br = new BufferedReader(new InputStreamReader(inputStream))) {
            String line;
            while ((line = br.readLine()) != null) {
                resultStringBuilder.append(line).append("\n");
            }
        }
        return resultStringBuilder.toString();
    }

}