文件管理實用類

public class FileUtil {

public static void copyFromAssets(Context context,String fileName, String newFileName) {
InputStream in = null;
OutputStream out = null;
try {
in = context.getAssets().open(fileName);
out = new FileOutputStream(newFileName);
byte bt[] = new byte[1024];
int c;
while ((c = in.read(bt)) > 0) {
out.write(bt, 0, c);
}
in.close();
out.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (in != null)
in.close();
if (out != null)
out.close();
} catch (IOException e2) {
e2.printStackTrace();
}


}
}

/**
* 新建目錄
* 
* @param folderPath
*            String 如 c:/fqf
* @return boolean
*/
public static void newFolder(String folderPath) {
try {
String filePath = folderPath;
filePath = filePath.toString();
java.io.File myFilePath = new java.io.File(filePath);
if (!myFilePath.exists()) {
myFilePath.mkdir();
}
} catch (Exception e) {
System.out.println("新建目錄操作出錯");
e.printStackTrace();
}
}


/**
* 新建文件
* 
* @param filePathAndName
*            String 文件路徑及名稱 如c:/fqf.txt
* @param fileContent
*            String 文件內容
* @return boolean
*/
public static void newFile(String filePathAndName, String fileContent) {


try {
String filePath = filePathAndName;
filePath = filePath.toString();
File myFilePath = new File(filePath);
if (!myFilePath.exists()) {
myFilePath.createNewFile();
}
FileWriter resultFile = new FileWriter(myFilePath);
PrintWriter myFile = new PrintWriter(resultFile);
String strContent = fileContent;
myFile.println(strContent);
resultFile.close();


} catch (Exception e) {
System.out.println("新建目錄操作出錯");
e.printStackTrace();


}


}


/**
* 刪除文件
* 
* @param filePathAndName
*            String 文件路徑及名稱 如c:/fqf.txt
* @param fileContent
*            String
* @return boolean
*/
public static void delFile(String filePathAndName) {
try {
String filePath = filePathAndName;
filePath = filePath.toString();
java.io.File myDelFile = new java.io.File(filePath);
myDelFile.delete();


} catch (Exception e) {
System.out.println("刪除文件操作出錯");
e.printStackTrace();


}


}


/**
* 刪除文件夾
* 
* @param filePathAndName
*            String 文件夾路徑及名稱 如c:/fqf
* @param fileContent
*            String
* @return boolean
*/
public static void delFolder(String folderPath) {
try {
delAllFile(folderPath); // 刪除完裏面所有內容
String filePath = folderPath;
filePath = filePath.toString();
java.io.File myFilePath = new java.io.File(filePath);
myFilePath.delete(); // 刪除空文件夾


} catch (Exception e) {
System.out.println("刪除文件夾操作出錯");
e.printStackTrace();


}


}


/**
* 刪除文件夾裏面的所有文件
* 
* @param path
*            String 文件夾路徑 如 c:/fqf
*/
public static void delAllFile(String path) {
File file = new File(path);
if (!file.exists()) {
return;
}
if (!file.isDirectory()) {
return;
}
String[] tempList = file.list();
File temp = null;
for (int i = 0; i < tempList.length; i++) {
if (path.endsWith(File.separator)) {
temp = new File(path + tempList[i]);
} else {
temp = new File(path + File.separator + tempList[i]);
}
if (temp.isFile()) {
temp.delete();
}
if (temp.isDirectory()) {
delAllFile(path + "/" + tempList[i]);// 先刪除文件夾裏面的文件
delFolder(path + "/" + tempList[i]);// 再刪除空文件夾
}
}
}


/**
* 複製單個文件
* 
* @param oldPath
*            String 原文件路徑 如：c:/fqf.txt
* @param newPath
*            String 複製後路徑 如：f:/fqf.txt
* @return boolean
*/
public static void copyFile(String oldPath, String newPath) {
try {
int bytesum = 0;
int byteread = 0;
File oldfile = new File(oldPath);
if (oldfile.exists()) { // 文件存在時
InputStream inStream = new FileInputStream(oldPath); // 讀入原文件
FileOutputStream fs = new FileOutputStream(newPath);
byte[] buffer = new byte[1444];
int length;
while ((byteread = inStream.read(buffer)) != -1) {
bytesum += byteread; // 字節數 文件大小
System.out.println(bytesum);
fs.write(buffer, 0, byteread);
}
inStream.close();
}
} catch (Exception e) {
System.out.println("複製單個文件操作出錯");
e.printStackTrace();


}


}


/**
* 複製整個文件夾內容
* 
* @param oldPath
*            String 原文件路徑 如：c:/fqf
* @param newPath
*            String 複製後路徑 如：f:/fqf/ff
* @return boolean
* @throws Exception 
*/
public static void copyFolder(String oldPath, String newPath) throws Exception {


// try {
(new File(newPath)).mkdirs(); // 如果文件夾不存在 則建立新文件夾
File a = new File(oldPath);
String[] file = a.list();
File temp = null;
for (int i = 0; i < file.length; i++) {
if (oldPath.endsWith(File.separator)) {
temp = new File(oldPath + file[i]);
} else {
temp = new File(oldPath + File.separator + file[i]);
}


if (temp.isFile()) {
FileInputStream input = new FileInputStream(temp);
FileOutputStream output = new FileOutputStream(newPath
+ "/" + (temp.getName()).toString());
byte[] b = new byte[1024 * 5];
int len;
while ((len = input.read(b)) != -1) {
output.write(b, 0, len);
}
output.flush();
output.close();
input.close();
}
if (temp.isDirectory()) {// 如果是子文件夾
copyFolder(oldPath + "/" + file[i], newPath + "/" + file[i]);
}
}
// } catch (Exception e) {
// System.out.println("複製整個文件夾內容操作出錯");
// e.printStackTrace();
//
// }


}


/**
* 移動文件到指定目錄
* 
* @param oldPath
*            String 如：c:/fqf.txt
* @param newPath
*            String 如：d:/fqf.txt
*/
public static void moveFile(String oldPath, String newPath) {
copyFile(oldPath, newPath);
delFile(oldPath);


}


/**
* 移動文件到指定目錄
* 
* @param oldPath
*            String 如：c:/fqf.txt
* @param newPath
*            String 如：d:/fqf.txt
* @throws Exception 
*/
public static void moveFolder(String oldPath, String newPath) throws Exception {
copyFolder(oldPath, newPath);
delFolder(oldPath);


}


/**
* 得到文件夾內文件個數
*/
public static int sizeFolder(String path) {
File file = new File(path);
if (!file.exists()) {
return 0;
}
if (file.isDirectory()) {
return file.list().length;
} else {
return 0;
}
}


/**
* 獲取單個文件MD5值
*/
public static String getMD5(File file) throws Exception {
InputStream fis;
fis = new FileInputStream(file);
byte[] buffer = new byte[1024];
MessageDigest md5 = MessageDigest.getInstance("MD5");
int numRead = 0;
while ((numRead = fis.read(buffer)) > 0) {
md5.update(buffer, 0, numRead);
}
fis.close();
return toHexString(md5.digest());
}


public static String toHexString(byte[] b) {
StringBuilder sb = new StringBuilder(b.length * 2);
for (int i = 0; i < b.length; i++) {
sb.append(hexChar[(b[i] & 0xf0) >>> 4]);
sb.append(hexChar[b[i] & 0x0f]);
}
return sb.toString();
}


public static char[] hexChar = { '0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };

/**
* 獲取單個文件MD5值
*/
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);
}

/**
* 獲取文件大小
*/
public static long getFileSize(String filePath){
if(filePath == null){
return 0;
}
File file = new File(filePath);
if(file.exists()){
return file.length();
} else {
return 0;
}
}


}