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package com.taobao.android.builder.tools;
import java.io.File;
import java.io.FileFilter;
import java.io.FileInputStream;
import java.io.IOException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
/**
* Created by shenghua.nish on 2015-04-13 下午3:33.
*/
public class MD5Util {
/**
* 默认的密码字符串组合，apache校验下载的文件的正确性用的就是默认的这个组合
*/
private final static String[] hexDigits = {"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d",
"e", "f"};
protected static MessageDigest messagedigest = null;
static {
try {
messagedigest = MessageDigest.getInstance("MD5");
} catch (NoSuchAlgorithmException nsaex) {
nsaex.printStackTrace();
}
}
/**
* 向getMD5方法传入一个你需要转换的原始字符串，将返回字符串的MD5码
*
* @param code 原始字符串
* @return 返回字符串的MD5码
*/
public static String getMD5(String origincode) throws Exception {
MessageDigest messageDigest = MessageDigest.getInstance("MD5");
byte[] bytes = origincode.getBytes();
byte[] results = messageDigest.digest(bytes);
StringBuilder stringBuilder = new StringBuilder();
for (byte result : results) {
// 将byte数组转化为16进制字符存入stringbuilder中
stringBuilder.append(String.format("%02x", result));
}
return stringBuilder.toString();
}
/**
* Get MD5 of one file:hex string
*
* @param file
* @return
*/
public static String getFileMD5(File file) {
if (!file.exists() || !file.isFile()) {
return null;
}
MessageDigest digest = null;
FileInputStream in = null;
byte buffer[] = new byte[1024];
int len;
String md5 = "";
try {
digest = MessageDigest.getInstance("MD5");
in = new FileInputStream(file);
while ((len = in.read(buffer, 0, 1024)) != -1) {
digest.update(buffer, 0, len);
}
in.close();
md5 = byteArrayToHexString(digest.digest());
} catch (Exception e) {
e.printStackTrace();
return null;
}
return md5;
}
/***
* Get MD5 of one file！test ok!
*
* @param filepath
* @return
*/
public static String getFileMD5(String filepath) {
File file = new File(filepath);
return getFileMD5(file);
}
public static String getFileMD5String(File file) throws IOException {
return getFileMD5(file);
}
/**
* 轮换字节数组为十六进制字符串
*
* @param b 字节数组
* @return 十六进制字符串
*/
private static String byteArrayToHexString(byte[] b) {
StringBuffer resultSb = new StringBuffer();
for (int i = 0; i < b.length; i++) {
resultSb.append(byteToHexString(b[i]));
}
return resultSb.toString();
}
// 将一个字节转化成十六进制形式的字符串
private static String byteToHexString(byte b) {
int n = b;
if (n < 0)
n = 256 + n;
int d1 = n / 16;
int d2 = n % 16;
return hexDigits[d1] + hexDigits[d2];
}
public static String getFileMd5(Collection<File> inputFiles) {
StringBuilder stringBuilder = new StringBuilder();
FileFilter fileFilter = new FileFilter() {
@Override
public boolean accept(File pathname) {
return pathname.isFile();
}
};
for (File file : inputFiles) {
if (null == file || !file.exists()) {
continue;
}
if (file.isFile()) {
stringBuilder.append(MD5Util.getFileMD5(file));
} else {
List<File> files = new ArrayList<File>();
listFilesForFolder(file, files);
for (File file1 : files) {
stringBuilder.append(MD5Util.getFileMD5(file1));
}
}
}
try {
return MD5Util.getMD5(stringBuilder.toString());
} catch (Exception e) {
e.printStackTrace();
return "";
}
}
private static void listFilesForFolder(final File folder, List<File> fileList) {
for (final File fileEntry : folder.listFiles()) {
if (fileEntry.isDirectory()) {
listFilesForFolder(fileEntry,fileList);
} else {
fileList.add(fileEntry);
}
}
}
}