public class FileUtil {
/**
* 删除文件
*
* @param context
* 程序上下文
* @param fileName
* 文件名,要在系统内保持唯一
* @return boolean 存储成功的标志
*/
public static boolean deleteFile(Context context, String fileName) {
return context.deleteFile(fileName);
}
/**
* 文件是否存在
*
* @param context
* @param fileName
* @return
*/
public static boolean exists(Context context, String fileName) {
return new File(context.getFilesDir(), fileName).exists();
}
/**
* 存储文本数据
*
* @param context
* 程序上下文
* @param fileName
* 文件名,要在系统内保持唯一
* @param content
* 文本内容
* @return boolean 存储成功的标志
*/
public static boolean writeFile(Context context, String fileName,
String content) {
boolean success = false;
FileOutputStream fos = null;
try {
fos = context.openFileOutput(fileName, Context.MODE_PRIVATE);
byte[] byteContent = content.getBytes();
fos.write(byteContent);
success = true;
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (fos != null)
fos.close();
} catch (IOException ioe) {
ioe.printStackTrace();
}
}
return success;
}
/**
* 存储文本数据
*
* @param context
* 程序上下文
* @param fileName
* 文件名,要在系统内保持唯一
* @param content
* 文本内容
* @return boolean 存储成功的标志
*/
public static boolean writeFile(String filePath, String content) {
boolean success = false;
FileOutputStream fos = null;
try {
fos = new FileOutputStream(filePath);
byte[] byteContent = content.getBytes();
fos.write(byteContent);
success = true;
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (fos != null)
fos.close();
} catch (IOException ioe) {
ioe.printStackTrace();
}
}
return success;
}
/**
* 文件
*
* @param srcFile
* @param dstFile
*/
public static void copy(File srcFile, File dstFile) {
try {
FileInputStream fis = new FileInputStream(srcFile);
FileOutputStream fos = new FileOutputStream(dstFile);
byte[] buffer = new byte[1024];
int length = 0;
while ((length = fis.read(buffer)) != -1) {
fos.write(buffer, 0, length);
}
fis.close();
fos.close();
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 读取文本数据
*
* @param context
* 程序上下文
* @param fileName
* 文件名
* @return String, 读取到的文本内容,失败返回null
*/
public static String readFile(Context context, String fileName) {
if (!exists(context, fileName)) {
return null;
}
FileInputStream fis = null;
String content = null;
try {
fis = context.openFileInput(fileName);
if (fis != null) {
byte[] buffer = new byte[1024];
ByteArrayOutputStream arrayOutputStream = new ByteArrayOutputStream();
while (true) {
int readLength = fis.read(buffer);
if (readLength == -1)
break;
arrayOutputStream.write(buffer, 0, readLength);
}
fis.close();
arrayOutputStream.close();
content = new String(arrayOutputStream.toByteArray());
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
content = null;
} finally {
try {
if (fis != null)
fis.close();
} catch (IOException ioe) {
ioe.printStackTrace();
}
}
return content;
}
/**
* 读取文本数据
*
* @param context
* 程序上下文
* @param fileName
* 文件名
* @return String, 读取到的文本内容,失败返回null
*/
public static String readFile(String filePath) {
if (filePath == null || !new File(filePath).exists()) {
return null;
}
FileInputStream fis = null;
String content = null;
try {
fis = new FileInputStream(filePath);
if (fis != null) {
byte[] buffer = new byte[1024];
ByteArrayOutputStream arrayOutputStream = new ByteArrayOutputStream();
while (true) {
int readLength = fis.read(buffer);
if (readLength == -1)
break;
arrayOutputStream.write(buffer, 0, readLength);
}
fis.close();
arrayOutputStream.close();
content = new String(arrayOutputStream.toByteArray());
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
content = null;
} finally {
try {
if (fis != null)
fis.close();
} catch (IOException ioe) {
ioe.printStackTrace();
}
}
return content;
}
/**
* 读取文本数据
*
* @param context
* 程序上下文
* @param fileName
* 文件名
* @return String, 读取到的文本内容,失败返回null
*/
public static String readAssets(Context context, String fileName) {
InputStream is = null;
String content = null;
try {
is = context.getAssets().open(fileName);
if (is != null) {
byte[] buffer = new byte[1024];
ByteArrayOutputStream arrayOutputStream = new ByteArrayOutputStream();
while (true) {
int readLength = is.read(buffer);
if (readLength == -1)
break;
arrayOutputStream.write(buffer, 0, readLength);
}
is.close();
arrayOutputStream.close();
content = new String(arrayOutputStream.toByteArray());
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
content = null;
} finally {
try {
if (is != null)
is.close();
} catch (IOException ioe) {
ioe.printStackTrace();
}
}
return content;
}
/**
* 存储List对象
*
* @param context
* 程序上下文
* @param fileName
* 文件名,要在系统内保持唯一
* @param list
* 对象数组集合,对象必须实现Parcelable
* @return boolean 存储成功的标志
*/
public static boolean writeParcelableList(Context context, String fileName,
List<Parcelable> list) {
boolean success = false;
FileOutputStream fos = null;
try {
if (list instanceof List) {
fos = context.openFileOutput(fileName, Context.MODE_PRIVATE);
Parcel parcel = Parcel.obtain();
parcel.writeList(list);
byte[] data = parcel.marshall();
fos.write(data);
success = true;
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (fos != null) {
try {
fos.close();
} catch (IOException ioe) {
ioe.printStackTrace();
}
}
}
return success;
}
/**
* 读取数据对象
*
* @param context
* 程序上下文
* @param fileName
* 文件名
* @return List, 读取到的对象数组,失败返回null
*/
@SuppressWarnings("unchecked")
public static List<Parcelable> readParcelableList(Context context,
String fileName, ClassLoader classLoader) {
List<Parcelable> results = null;
FileInputStream fis = null;
ByteArrayOutputStream bos = null;
try {
fis = context.openFileInput(fileName);
if (fis != null) {
bos = new ByteArrayOutputStream();
byte[] b = new byte[4096];
int bytesRead;
while ((bytesRead = fis.read(b)) != -1) {
bos.write(b, 0, bytesRead);
}
byte[] data = bos.toByteArray();
Parcel parcel = Parcel.obtain();
parcel.unmarshall(data, 0, data.length);
parcel.setDataPosition(0);
results = parcel.readArrayList(classLoader);
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
results = null;
} finally {
if (fis != null)
try {
fis.close();
} catch (IOException e) {
e.printStackTrace();
}
if (bos != null)
try {
bos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return results;
}
public static boolean saveSerializable(Context context, String fileName,
Serializable data) {
boolean success = false;
ObjectOutputStream oos = null;
try {
oos = new ObjectOutputStream(context.openFileOutput(fileName,
Context.MODE_PRIVATE));
oos.writeObject(data);
success = true;
} catch (Exception e) {
e.printStackTrace();
} finally {
if (oos != null) {
try {
oos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return success;
}
public static Serializable readSerialLizable(Context context,
String fileName) {
Serializable data = null;
ObjectInputStream ois = null;
try {
ois = new ObjectInputStream(context.openFileInput(fileName));
data = (Serializable) ois.readObject();
} catch (Exception e) {
e.printStackTrace();
} finally {
if (ois != null) {
try {
ois.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return data;
}
/**
* 从assets里边读取字符串
*
* @param context
* @param fileName
* @return
*/
public static String getFromAssets(Context context, String fileName) {
try {
InputStreamReader inputReader = new InputStreamReader(context
.getResources().getAssets().open(fileName));
BufferedReader bufReader = new BufferedReader(inputReader);
String line = "";
String Result = "";
while ((line = bufReader.readLine()) != null)
Result += line;
return Result;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* 复制文件
*
* @param srcFile
* @param dstFile
* @return
*/
public static boolean copy(String srcFile, String dstFile) {
FileInputStream fis = null;
FileOutputStream fos = null;
try {
File dst = new File(dstFile);
if (!dst.getParentFile().exists()) {
dst.getParentFile().mkdirs();
}
fis = new FileInputStream(srcFile);
fos = new FileOutputStream(dstFile);
byte[] buffer = new byte[1024];
int len = 0;
while ((len = fis.read(buffer)) != -1) {
fos.write(buffer, 0, len);
}
} catch (Exception e) {
e.printStackTrace();
return false;
} finally {
if (fis != null) {
try {
fis.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (fos != null) {
try {
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return true;
}
}