文件夹比较 java递归比较文件夹

import java.io.FileInputStream;

import java.math.BigInteger;

import java.security.MessageDigest;

import java.util.HashMap;

import java.util.Iterator;

import java.util.Map;

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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;

????}

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????public static void main(String[] args) {

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????????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));

????????}

????????

????}

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}