文件夹比较 java递归比较文件夹

手工发布程序到多个节点，没有做自动同步，偶尔会出现节点程序不一致的情况，所以写了个文件夹比较的小程序，用于对比两个文件夹内文件的不同。

import java.io.File;

import java.io.FileInputStream;

import java.math.BigInteger;

import java.security.MessageDigest;

import java.util.HashMap;

import java.util.Iterator;

import java.util.Map;

 

public class DirDiff {

    /**

     * 获取单个文件的MD5值！

     *

     * @param file

     * @return

     */

    public static String getFileMD5(File file) {

        if (!file.isFile()) {

            return null;

        }

        MessageDigest digest = null;

        FileInputStream in = null;

        byte buffer[] = new byte[1024];

        int len;

        try {

            digest = MessageDigest.getInstance("MD5");

            in = new FileInputStream(file);

            while ((len = in.read(buffer, 0, 1024)) != -1) {

                digest.update(buffer, 0, len);

            }

            in.close();

        } catch (Exception e) {

            e.printStackTrace();

            return null;

        }

        BigInteger bigInt = new BigInteger(1, digest.digest());

        return bigInt.toString(16);

    }

 

    /**

     * 获取文件夹中文件的MD5值

     *

     * @param file

     * @param listChild

     * ;true递归子目录中的文件

     * @return

     */

    public static Map<String, String> getDirMD5(File file, boolean listChild) {

        if (!file.isDirectory()) {

            return null;

        }

        Map<String, String> map = new HashMap<String, String>();

        String md5;

        File files[] = file.listFiles();

        for (int i = 0; i < files.length; i++) {

            File f = files[i];

            if (f.isDirectory() && listChild) {

                map.putAll(getDirMD5(f, listChild));

            } else {

                md5 = getFileMD5(f);

                if (md5 != null) {

                    map.put(f.getPath(), md5);

                }

            }

        }

        return map;

    }

 

    public static void main(String[] args) {

 

        String dir1 = "D:\\temp\\server1";

        String dir2 = "D:\\temp\\server2";

        

        Map<String, String> map = getDirMD5(new File(dir1), true);

        Map<String, String> map2 = getDirMD5(new File(dir2), true);

        

        Iterator<String> it = map.keySet().iterator();

        while(it.hasNext()){

            String key = it.next();

            String key2 = key.replace(dir1, dir2);

            String value = map.get(key);

            String value2 = map2.remove(key2);

            if(value2 == null){

                System.out.println(key + " -> " + value + " || 文件不存在" );

            }else if (!value.equals(value2)){

                System.out.println(key + " -> " + value + " || " + value2 );

            }

        }

        

        it = map2.keySet().iterator();

        while(it.hasNext()){

            String key = it.next();

            System.out.println("文件不存在 || " + key + " -> " + map2.get(key));

        }

        

    }

 

}