📄 fileutil.java
字号:
}
/**
* Copy the given source file to the given destination file.
* Returns file copy success or not.
* @param _source source file
* @param _dest destination file
* @return true if file copy successful, false if copy failed
*/
/*
// FileChannel.transferTo() seems to fail under certain linux configurations.
public static boolean copyFile( final File _source, final File _dest ) {
FileChannel source = null;
FileChannel dest = null;
try {
if( _source.length() < 1L ) {
throw new IOException( _source.getAbsolutePath() + " does not exist or is 0-sized" );
}
source = new FileInputStream( _source ).getChannel();
dest = new FileOutputStream( _dest ).getChannel();
source.transferTo(0, source.size(), dest);
return true;
}
catch (Exception e) {
Debug.out( e );
return false;
}
finally {
try {
if (source != null) source.close();
if (dest != null) dest.close();
}
catch (Exception ignore) {}
}
}
*/
public static boolean copyFile( final File _source, final File _dest ) {
try {
copyFile( new FileInputStream( _source ), new FileOutputStream( _dest ) );
return true;
}
catch( Throwable e ) {
Debug.printStackTrace( e );
return false;
}
}
public static boolean copyFile( final File _source, final OutputStream _dest, boolean closeOutputStream ) {
try {
copyFile( new FileInputStream( _source ), _dest, closeOutputStream );
return true;
}
catch( Throwable e ) {
Debug.printStackTrace( e );
return false;
}
}
public static void
copyFile(
InputStream is,
OutputStream os )
throws IOException {
copyFile(is,os,true);
}
public static void
copyFile(
InputStream is,
OutputStream os,
boolean closeInputStream)
throws IOException
{
try{
if ( !(is instanceof BufferedInputStream )){
is = new BufferedInputStream(is);
}
byte[] buffer = new byte[65536*2];
while(true){
int len = is.read(buffer);
if ( len == -1 ){
break;
}
os.write( buffer, 0, len );
}
}finally{
try{
if(closeInputStream)
is.close();
}catch( IOException e ){
}
os.close();
}
}
/**
* Returns the file handle for the given filename or it's
* equivalent .bak backup file if the original doesn't exist
* or is 0-sized. If neither the original nor the backup are
* available, a null handle is returned.
* @param _filename root name of file
* @return file if successful, null if failed
*/
public static File getFileOrBackup( final String _filename ) {
try {
File file = new File( _filename );
//make sure the file exists and isn't zero-length
if ( file.length() <= 1L ) {
//if so, try using the backup file
File bakfile = new File( _filename + ".bak" );
if ( bakfile.length() <= 1L ) {
return null;
}
else return bakfile;
}
else return file;
}
catch (Exception e) {
Debug.out( e );
return null;
}
}
public static File
getJarFileFromURL(
String url_str )
{
if (url_str.startsWith("jar:file:")) {
// java web start returns a url like "jar:file:c:/sdsd" which then fails as the file
// part doesn't start with a "/". Add it in!
// here's an example
// jar:file:C:/Documents%20and%20Settings/stuff/.javaws/cache/http/Dparg.homeip.net/P9090/DMazureus-jnlp/DMlib/XMAzureus2.jar1070487037531!/org/gudy/azureus2/internat/MessagesBundle.properties
// also on Mac we don't get the spaces escaped
url_str = url_str.replaceAll(" ", "%20" );
if ( !url_str.startsWith("jar:file:/")){
url_str = "jar:file:/".concat(url_str.substring(9));
}
try{
// you can see that the '!' must be present and that we can safely use the last occurrence of it
int posPling = url_str.lastIndexOf('!');
String jarName = url_str.substring(4, posPling);
// System.out.println("jarName: " + jarName);
URI uri = URI.create(jarName);
File jar = new File(uri);
return( jar );
}catch( Throwable e ){
Debug.printStackTrace( e );
}
}
return( null );
}
public static boolean
renameFile(
File from_file,
File to_file )
{
if ( to_file.exists()){
Logger.log(new LogAlert(LogAlert.REPEATABLE, LogAlert.AT_ERROR,
"renameFile: target file '" + to_file + "' already exists, failing"));
return( false );
}
if ( !from_file.exists()){
Logger
.log(new LogAlert(LogAlert.REPEATABLE, LogAlert.AT_ERROR,
"renameFile: source file '" + from_file
+ "' already exists, failing"));
return( false );
}
if ( from_file.isDirectory()){
to_file.mkdirs();
File[] files = from_file.listFiles();
if ( files == null ){
// empty dir
return( true );
}
int last_ok = 0;
for (int i=0;i<files.length;i++){
File ff = files[i];
File tf = new File( to_file, ff.getName());
try{
if ( renameFile( ff, tf )){
last_ok++;
}else{
break;
}
}catch( Throwable e ){
Logger.log(new LogAlert(LogAlert.REPEATABLE,
"renameFile: failed to rename file '" + ff.toString() + "' to '"
+ tf.toString() + "'", e));
break;
}
}
if ( last_ok == files.length ){
File[] remaining = from_file.listFiles();
if ( remaining != null && remaining.length > 0 ){
Logger.log(new LogAlert(LogAlert.REPEATABLE, LogAlert.AT_ERROR,
"renameFile: files remain in '" + from_file.toString()
+ "', not deleting"));
}else{
if ( !from_file.delete()){
Logger.log(new LogAlert(LogAlert.REPEATABLE, LogAlert.AT_ERROR,
"renameFile: failed to delete '" + from_file.toString() + "'"));
}
}
return( true );
}
// recover by moving files back
for (int i=0;i<last_ok;i++){
File ff = files[i];
File tf = new File( to_file, ff.getName());
try{
if ( !renameFile( tf, ff )){
Logger.log(new LogAlert(LogAlert.REPEATABLE, LogAlert.AT_ERROR,
"renameFile: recovery - failed to move file '" + tf.toString()
+ "' to '" + ff.toString() + "'"));
}
}catch( Throwable e ){
Logger.log(new LogAlert(LogAlert.REPEATABLE,
"renameFile: recovery - failed to move file '" + tf.toString()
+ "' to '" + ff.toString() + "'", e));
}
}
return( false );
}else{
if ( (!COConfigurationManager.getBooleanParameter("Copy And Delete Data Rather Than Move")) &&
from_file.renameTo( to_file )){
return( true );
}else{
boolean success = false;
// can't rename across file systems under Linux - try copy+delete
FileInputStream fis = null;
FileOutputStream fos = null;
try{
fis = new FileInputStream( from_file );
fos = new FileOutputStream( to_file );
byte[] buffer = new byte[65536];
while( true ){
int len = fis.read( buffer );
if ( len <= 0 ){
break;
}
fos.write( buffer, 0, len );
}
fos.close();
fos = null;
fis.close();
fis = null;
if ( !from_file.delete()){
Logger.log(new LogAlert(LogAlert.REPEATABLE,
LogAlert.AT_ERROR, "renameFile: failed to delete '"
+ from_file.toString() + "'"));
throw( new Exception( "Failed to delete '" + from_file.toString() + "'"));
}
success = true;
return( true );
}catch( Throwable e ){
Logger.log(new LogAlert(LogAlert.REPEATABLE,
"renameFile: failed to rename '" + from_file.toString()
+ "' to '" + to_file.toString() + "'", e));
return( false );
}finally{
if ( fis != null ){
try{
fis.close();
}catch( Throwable e ){
}
}
if ( fos != null ){
try{
fos.close();
}catch( Throwable e ){
}
}
// if we've failed then tidy up any partial copy that has been performed
if ( !success ){
if ( to_file.exists()){
to_file.delete();
}
}
}
}
}
}
public static void writeBytesAsFile( String filename, byte[] file_data ) {
try{
File file = new File( filename );
FileOutputStream out = new FileOutputStream( file );
out.write( file_data );
out.close();
}
catch( Throwable t ) {
Debug.out( "writeBytesAsFile:: error: ", t );
}
}
public static boolean
deleteWithRecycle(
File file )
{
if ( COConfigurationManager.getBooleanParameter("Move Deleted Data To Recycle Bin" )){
try{
final PlatformManager platform = PlatformManagerFactory.getPlatformManager();
if (platform.hasCapability(PlatformManagerCapabilities.RecoverableFileDelete)){
platform.performRecoverableFileDelete( file.getAbsolutePath());
return( true );
}else{
return( file.delete());
}
}catch( PlatformManagerException e ){
return( file.delete());
}
}else{
return( file.delete());
}
}
}
⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -