Java程序之检索文件方式(含内容)

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Scanner;

public class demo4 {
    public static void main(String[] args) throws IOException {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入要扫描的路径");
        File rootDir = new File(scanner.next());
        System.out.println("请输入要查询的词");
        String toFind = scanner.next();

        scanDir(rootDir,toFind);
    }

    private static void scanDir(File rootDir, String toFind) throws IOException {
        File[] files = rootDir.listFiles();
        if(files == null){
            return;
        }
        for (File f:files) {
            if(f.isDirectory()){
                scanDir(f,toFind);
            } else checkFile(f,toFind);
        }
    }

    private static void checkFile(File f, String toFind) throws IOException {
        if(f.getName().contains(toFind)){
            System.out.println("该文件名中包含关键词：" + f.getCanonicalPath());
        }
        try(InputStream inputStream = new FileInputStream(f)){
            Scanner scanner = new Scanner(inputStream);
            StringBuilder stringBuilder = new StringBuilder();
            while(scanner.hasNextLine()){
                stringBuilder.append(scanner.nextLine() + "\n");
            }
            if(stringBuilder.indexOf(toFind) > -1){
                System.out.println("该文件内容包含关键字: " + f.getCanonicalPath());
            }
        }
    }
}

private static void scanDir(File rootDir, String toFind) throws IOException {
    File[] files = rootDir.listFiles();
    if(files == null){
        return;
    }
    for (File f:files) {
        if(f.isDirectory()){
            scanDir(f,toFind);
        } else checkFile(f,toFind);
    }
}

private static void checkFile(File f, String toFind) throws IOException {
    if(f.getName().contains(toFind)){
        System.out.println("该文件名中包含关键词：" + f.getCanonicalPath());
    }
    try(InputStream inputStream = new FileInputStream(f)){
        Scanner scanner = new Scanner(inputStream);
        StringBuilder stringBuilder = new StringBuilder();
        while(scanner.hasNextLine()){
            stringBuilder.append(scanner.nextLine() + "\n");
        }
        if(stringBuilder.indexOf(toFind) > -1){
            System.out.println("该文件内容包含关键字: " + f.getCanonicalPath());
        }
    }
}