package com.doumee.core.utils;
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import java.io.File;
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import java.io.FileInputStream;
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import java.math.BigInteger;
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import java.security.MessageDigest;
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import java.util.HashMap;
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import java.util.Map;
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public class FileDigest {
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/**
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* 计算文件的MD5值
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*
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* @param file
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* @return
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*/
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public static String getFileMD5(File file) {
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if (!file.isFile()) {
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return null;
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}
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MessageDigest digest = null;
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FileInputStream in = null;
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byte buffer[] = new byte[1024];
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int len;
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try {
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digest = MessageDigest.getInstance("MD5");
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in = new FileInputStream(file);
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while ((len = in.read(buffer, 0, 1024)) != -1) {
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digest.update(buffer, 0, len);
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}
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in.close();
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} catch (Exception e) {
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e.printStackTrace();
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return null;
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}
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BigInteger bigInt = new BigInteger(1, digest.digest());
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return bigInt.toString(16);
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}
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/**
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* 计算文件夹的MD5值
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*
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* @param file
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* @param listChild
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* @return
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*/
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public static Map<String, String> getDirMD5(File file, boolean listChild) {
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if (!file.isDirectory()) {
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return null;
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}
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// <filepath,md5>
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Map<String, String> map = new HashMap<String, String>();
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String md5;
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File files[] = file.listFiles();
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for (int i = 0; i < files.length; i++) {
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File f = files[i];
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if (f.isDirectory() && listChild) {
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map.putAll(getDirMD5(f, listChild));
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} else {
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md5 = getFileMD5(f);
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if (md5 != null) {
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map.put(f.getPath(), md5);
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}
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}
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}
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return map;
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}
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}
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