java 获取文件的MD5值

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package com.example.assetsdemo;import java.io.File;import java.io.FileInputStream;import java.math.BigInteger;import java.security.MessageDigest;import java.util.HashMap;import java.util.Map;public class FileDigest {/** * 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;}// <filepath,md5>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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