package doumeemes.core.utils;
|
|
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 {
|
/**
|
* 计算文件的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);
|
}
|
|
/**
|
* 计算文件夹的MD5值
|
*
|
* @param file
|
* @param listChild
|
* @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;
|
}
|
|
}
|
