package com.yixia.camera.util;
import android.os.Environment;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.math.BigInteger;
import java.net.FileNameMap;
import java.net.URLConnection;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
public class FileUtils {
/** 拼接路径
* concatPath("/mnt/sdcard", "/DCIM/Camera") => /mnt/sdcard/DCIM/Camera
* concatPath("/mnt/sdcard", "DCIM/Camera") => /mnt/sdcard/DCIM/Camera
* concatPath("/mnt/sdcard/", "/DCIM/Camera") => /mnt/sdcard/DCIM/Camera
* */
public static String concatPath(String... paths) {
StringBuilder result = new StringBuilder();
if (paths != null) {
for (String path : paths) {
if (path != null && path.length() > 0) {
int len = result.length();
boolean suffixSeparator = len > 0 && result.charAt(len - 1) == File.separatorChar;//后缀是否是'/'
boolean prefixSeparator = path.charAt(0) == File.separatorChar;//前缀是否是'/'
if (suffixSeparator && prefixSeparator) {
result.append(path.substring(1));
} else if (!suffixSeparator && !prefixSeparator) {//补前缀
result.append(File.separatorChar);
result.append(path);
} else {
result.append(path);
}
}
}
}
return result.toString();
}
/** 计算文件的md5值 */
public static String calculateMD5(File updateFile) {
MessageDigest digest;
try {
digest = MessageDigest.getInstance("MD5");
} catch (NoSuchAlgorithmException e) {
Log.e("FileUtils", "Exception while getting digest", e);
return null;
}
InputStream is;
try {
is = new FileInputStream(updateFile);
} catch (FileNotFoundException e) {
Log.e("FileUtils", "Exception while getting FileInputStream", e);
return null;
}
//DigestInputStream
byte[] buffer = new byte[8192];
int read;
try {
while ((read = is.read(buffer)) > 0) {
digest.update(buffer, 0, read);
}
byte[] md5sum = digest.digest();
BigInteger bigInt = new BigInteger(1, md5sum);
String output = bigInt.toString(16);
// Fill to 32 chars
output = String.format("%32s", output).replace(' ', '0');
return output;
} catch (IOException e) {
throw new RuntimeException("Unable to process file for MD5", e);
} finally {
try {
is.close();
} catch (IOException e) {
Log.e("FileUtils", "Exception on closing MD5 input stream", e);
}
}
}
/** 计算文件的md5值 */
public static String calculateMD5(File updateFile, int offset, int partSize) {
MessageDigest digest;
try {
digest = MessageDigest.getInstance("MD5");
} catch (NoSuchAlgorithmException e) {
Log.e("FileUtils", "Exception while getting digest", e);
return null;
}
InputStream is;
try {
is = new FileInputStream(updateFile);
} catch (FileNotFoundException e) {
Log.e("FileUtils", "Exception while getting FileInputStream", e);
return null;
}
//DigestInputStream
final int buffSize = 8192;//单块大小
byte[] buffer = new byte[buffSize];
int read;
try {
if (offset > 0) {
is.skip(offset);
}
int byteCount = Math.min(buffSize, partSize), byteLen = 0;
while ((read = is.read(buffer, 0, byteCount)) > 0 && byteLen < partSize) {
digest.update(buffer, 0, read);
byteLen += read;
//检测最后一块，避免多读数据
if (byteLen + buffSize > partSize) {
byteCount = partSize - byteLen;
}
}
byte[] md5sum = digest.digest();
BigInteger bigInt = new BigInteger(1, md5sum);
String output = bigInt.toString(16);
// Fill to 32 chars
output = String.format("%32s", output).replace(' ', '0');
return output;
} catch (IOException e) {
throw new RuntimeException("Unable to process file for MD5", e);
} finally {
try {
is.close();
} catch (IOException e) {
Log.e("FileUtils", "Exception on closing MD5 input stream", e);
}
}
}
/** 检测文件是否可用 */
public static boolean checkFile(File f) {
if (f != null && f.exists() && f.canRead() && (f.isDirectory() || (f.isFile() && f.length() > 0))) {
return true;
}
return false;
}
/** 检测文件是否可用 */
public static boolean checkFile(String path) {
if (StringUtils.isNotEmpty(path)) {
File f = new File(path);
if (f != null && f.exists() && f.canRead() && (f.isDirectory() || (f.isFile() && f.length() > 0)))
return true;
}
return false;
}
/** 获取sdcard路径 */
public static String getExternalStorageDirectory() {
String path = Environment.getExternalStorageDirectory().getPath();
if (DeviceUtils.isZte()) {
// if (!Environment.getExternalStoragePublicDirectory(
// Environment.DIRECTORY_DCIM).exists()) {
path = path.replace("/sdcard", "/sdcard-ext");
// }
}
return path;
}
public static long getFileSize(String fn) {
File f = null;
long size = 0;
try {
f = new File(fn);
size = f.length();
} catch (Exception e) {
e.printStackTrace();
} finally {
f = null;
}
return size < 0 ? null : size;
}
public static long getFileSize(File fn) {
return fn == null ? 0 : fn.length();
}
public static String getFileType(String fn, String defaultType) {
FileNameMap fNameMap = URLConnection.getFileNameMap();
String type = fNameMap.getContentTypeFor(fn);
return type == null ? defaultType : type;
}
public static String getFileType(String fn) {
return getFileType(fn, "application/octet-stream");
}
public static String getFileExtension(String filename) {
String extension = "";
if (filename != null) {
int dotPos = filename.lastIndexOf(".");
if (dotPos >= 0 && dotPos < filename.length() - 1) {
extension = filename.substring(dotPos + 1);
}
}
return extension.toLowerCase();
}
public static boolean deleteFile(File f) {
if (f != null && f.exists() && !f.isDirectory()) {
return f.delete();
}
return false;
}
public static void deleteDir(File f) {
if (f != null && f.exists() && f.isDirectory()) {
for (File file : f.listFiles()) {
if (file.isDirectory())
deleteDir(file);
file.delete();
}
f.delete();
}
}
public static void deleteDir(String f) {
if (f != null && f.length() > 0) {
deleteDir(new File(f));
}
}
public static boolean deleteFile(String f) {
if (f != null && f.length() > 0) {
return deleteFile(new File(f));
}
return false;
}
/**
* read file
*
* @param filePath
* @param charsetName
* The name of a supported {@link java.nio.charset.Charset
* </code>charset<code>}
* @return if file not exist, return null, else return content of file
* @throws RuntimeException
* if an error occurs while operator BufferedReader
*/
public static String readFile(File file, String charsetName) {
StringBuilder fileContent = new StringBuilder("");
if (file == null || !file.isFile()) {
return fileContent.toString();
}
BufferedReader reader = null;
try {
InputStreamReader is = new InputStreamReader(new FileInputStream(file), charsetName);
reader = new BufferedReader(is);
String line = null;
while ((line = reader.readLine()) != null) {
if (!fileContent.toString().equals("")) {
fileContent.append("\r\n");
}
fileContent.append(line);
}
reader.close();
} catch (IOException e) {
throw new RuntimeException("IOException occurred. ", e);
} finally {
if (reader != null) {
try {
reader.close();
} catch (IOException e) {
throw new RuntimeException("IOException occurred. ", e);
}
}
}
return fileContent.toString();
}
public static String readFile(String filePath, String charsetName) {
return readFile(new File(filePath), charsetName);
}
public static String readFile(File file) {
return readFile(file, "utf-8");
}
/**
* 文件拷贝
*
* @param from
* @param to
* @return
*/
public static boolean fileCopy(String from, String to) {
boolean result = false;
int size = 1 * 1024;
FileInputStream in = null;
FileOutputStream out = null;
try {
in = new FileInputStream(from);
out = new FileOutputStream(to);
byte[] buffer = new byte[size];
int bytesRead = -1;
while ((bytesRead = in.read(buffer)) != -1) {
out.write(buffer, 0, bytesRead);
}
out.flush();
result = true;
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (in != null) {
in.close();
}
} catch (IOException e) {
}
try {
if (out != null) {
out.close();
}
} catch (IOException e) {
}
}
return result;
}
}