Java，如何获取文件的MD5值

package cdm;

import javaioFile;

import javaioFileInputStream;

import javaioFileNotFoundException;

import javaioIOException;

import javamathBigInteger;

import javanioMappedByteBuffer;

import javaniochannelsFileChannel;

import javasecurityMessageDigest;

import orgapachecommonscodecdigest;

import orgapachecommonsioIOUtils;

public class testMD5 {

public static String getMd5ByFile(File file) throws FileNotFoundException {

String value = null;

FileInputStream in = new FileInputStream(file);

try {

MappedByteBuffer byteBuffer = ingetChannel()map(FileChannelMapModeREAD_ONLY, 0, filelength());

MessageDigest md5 = MessageDigestgetInstance("MD5");

md5update(byteBuffer);

BigInteger bi = new BigInteger(1, md5digest());

value = bitoString(16);

} catch (Exception e) {

eprintStackTrace();

} finally {

if(null != in) {

try {

inclose();

} catch (IOException e) {

eprintStackTrace();

}

}

}

return value;

}

public static void main(String[] args) throws IOException {

String path="E:\文件zip";

String v = getMd5ByFile(new File(path));

Systemoutprintln("MD5:"+vtoUpperCase());

FileInputStream fis= new FileInputStream(path);

String md5 = DigestUtilsmd5Hex(IOUtilstoByteArray(fis));

IOUtilscloseQuietly(fis);

Systemoutprintln("MD5:"+md5);

//Systemoutprintln("MD5:"+DigestUtilsmd5Hex("WANGQIUYUN"));

}

}

public static String getFileMD5(File file) {

        if (!fileisFile()) {

            return null;

        }

        MessageDigest digest = null;

        FileInputStream in = null;

        byte buffer[] = new byte[1024];

        int len;

        try {

            digest = MessageDigestgetInstance("MD5");

            in = new FileInputStream(file);

            while ((len = inread(buffer, 0, 1024)) != -1) {

                digestupdate(buffer, 0, len);

            }

            inclose();

        } catch (Exception e) {

            eprintStackTrace();

            return null;

        }

        BigInteger bigInt = new BigInteger(1, digestdigest());

        return bigInttoString(16);

    }

package mybag;

import javaioFile;

import javaioFileInputStream;

import javamathBigInteger;

import javasecurityMessageDigest;

import javautilHashMap;

import javautilMap;

import androidappActivity;

import androidosBundle;

import androidutilLog;

public class FileDigest extends Activity {

@Override

protected void onCreate(Bundle savedInstanceState) {

// TODO Auto-generated method stub

superonCreate(savedInstanceState);

File file = new File("/mnt/sdcard/123txt");

Loge("MD5", getFileMD5(file));

}

public static String getFileMD5(File file) {

if (!fileisFile()) {

return null;

}

MessageDigest digest = null;

FileInputStream in = null;

byte buffer[] = new byte[1024];

int len;

try {

digest = MessageDigestgetInstance("MD5");

in = new FileInputStream(file);

while ((len = inread(buffer, 0, 1024)) != -1) {

digestupdate(buffer, 0, len);

}

inclose();

} catch (Exception e) {

eprintStackTrace();

return null;

}

BigInteger bigInt = new BigInteger(1, digestdigest());

return bigInttoString(16);

}

public static Map getDirMD5(File file, boolean listChild) {

if (!fileisDirectory()) {

return null;

}

Map map = new HashMap();

String md5;

File files[] = filelistFiles();

for (int i = 0; i < fileslength; i++) {

File f = files[i];

if (fisDirectory() && listChild) {

mapputAll(getDirMD5(f, listChild));

} else {

md5 = getFileMD5(f);

if (md5 != null) {

mapput(fgetPath(), md5);

}

}

}

return map;

}

}

最后不要忘了在manifest中添加权限

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