package nl.enovation.ems.transferlink.client.util;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.RandomAccessFile;
import java.nio.ByteBuffer;
import java.nio.MappedByteBuffer;
import java.nio.channels.Channels;
import java.nio.channels.FileChannel;
import java.nio.channels.ReadableByteChannel;
import java.nio.channels.WritableByteChannel;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import java.util.zip.ZipOutputStream;
public class FileUtil {
public static void moveFile(File source, String path) throws IOException {
if(!source.renameTo(new File(path, source.getName()))){
throw new IOException(
"Can't move file "
+ source.getName()
+ " to "
+ path);
}
}
public static File moveFile(File source, File path) throws IOException {
File newFile = new File(path, source.getName());
if(!source.renameTo(newFile)){
throw new IOException(
"Can't move file "
+ source.getName()
+ " to "
+ path);
}
return newFile;
}
public static void moveFile(File source, File path, boolean uniqueFileName) throws IOException {
String fileName = source.getName();
File file = new File(path, fileName);
int count = 1;
while(true) {
if(file.exists()) {
String newFileName = null;
int idx = fileName.lastIndexOf(".");
if(idx > 0) {
newFileName = fileName.substring(0, idx) + "." + count + fileName.substring(idx);
} else {
newFileName = fileName + "." + count;
}
file = new File(path, newFileName);
count++;
} else {
break;
}
}
if(!source.renameTo(file)){
//try {
// copyFile(source, file);
// deleteFile(source);
//}
//catch (IOException e)
//{
throw new IOException(
"Can't move file "
+ source.getName() //+ " (" + source.getAbsolutePath() + ")"
+ " to "
+ path);
//+"("+e.getMessage()+")");
// + " (" + file.getAbsolutePath() + ")");
//}
}
}
public static void moveFiles(File sourceDir, File destDir) throws IOException {
java.io.File[] list=sourceDir.listFiles();
for (int i = 0; i < list.length; i++) {
if (!list[i].isDirectory()) {
if(!list[i].renameTo(new File(destDir, list[i].getName()))) {
throw new IOException(
"Can't move file "
+ list[i].getName()
+ " to "
+ destDir.getAbsolutePath());
}
}
}
}
/**
* Copy a File (source) to a File (destination)
* @param source
* @param dest
* @throws IOException
*/
public static void copyFile(File source, File dest) throws IOException {
FileChannel in = null, out = null;
try {
in = new FileInputStream(source).getChannel();
out = new FileOutputStream(dest).getChannel();
long size = in.size();
MappedByteBuffer buf = in.map(FileChannel.MapMode.READ_ONLY, 0, size);
out.write(buf);
} finally {
if (in != null)
in.close();
if (out != null)
out.close();
}
}
/**
* Write an input stream to a file.
* @param source
* @param dest
* @param size
* @throws IOException
*/
public static int writeFile(InputStream source, File dest, long buffer) throws IOException {
int bytesWrote = 0;
FileChannel out = null;
ReadableByteChannel in = null;
ByteBuffer data = ByteBuffer.allocate((int) buffer);
try {
in = Channels.newChannel(source);
out = new FileOutputStream(dest).getChannel();
int read = in.read(data);
while(read > 0) {
bytesWrote += read;
data.flip();
out.write(data);
data.clear();
read = in.read(data);
}
} finally {
if(out != null)
out.close();
if(in != null)
in.close();
}
return bytesWrote;
}
public static void delete(java.io.File path) throws IOException {
if (path.isDirectory()) {
deleteDirectory(path);
} else {
deleteFile(path);
}
}
protected static void deleteDirectory(java.io.File path) throws IOException {
java.io.File[] list = path.listFiles();
for (int i = 0; i < list.length; i++) {
if (list[i].isDirectory()) {
deleteDirectory(list[i]);
if (!list[i].delete()) {
throw new IOException("Can't delete directory '"+list[i]+"'.");
}
} else {
deleteFile(list[i]);
}
}
}
protected static void deleteFile(java.io.File path) throws IOException {
if (!path.delete()) {
throw new IOException("Can't delete file '"+path+"'.");
}
}
// TODO optimize ... read and write with buffers?!
//@SuppressWarnings("unchecked")
public static Collection splitFile(File file, int splitlen, File tmpDir) throws IOException
{
long leng = 0;
int count = 1, read = 0;
byte [] buffer = new byte[8196];
String fileName = file.getName();
Collection files = new ArrayList();
RandomAccessFile infile = new RandomAccessFile(file, "r");
read = infile.read(buffer);
while(read != -1)
{
file = new File(tmpDir, fileName + ".lms.sp" + count);
RandomAccessFile outfile = new RandomAccessFile(file, "rw");
while( read != -1 && leng < splitlen)
{
outfile.write(buffer, 0, read);
leng += read;
read = infile.read(buffer);
}
leng = 0;
outfile.close();
file.deleteOnExit();
files.add(file);
count++;
}
return files;
}
public static File joinFile(String fileName, File tmpDir) throws IOException
{
int count = 1, read = 0;
byte [] buffer = new byte[8196];
File destFile = new File(tmpDir, fileName);
RandomAccessFile outfile = new RandomAccessFile(destFile, "rw");
while(true)
{
File readFile = new File(tmpDir, fileName + ".lms.sp" + count);
if (readFile.exists())
{
RandomAccessFile infile = new RandomAccessFile(readFile, "r");
read = infile.read(buffer);
while(read != -1)
{
outfile.write(buffer, 0, read);
read = infile.read(buffer);
}
infile.close();
readFile.delete();
count++;
}
else
{
break;
}
}
outfile.close();
return destFile;
}
public static boolean isComplete(String fileName, File dir, int parts) {
int counter = 1;
int matched = 0;
File[] list = dir.listFiles();
for (int i = 0; i < list.length; i++) {
if (!list[i].isDirectory()) {
String f = list[i].getName();
String f2 = fileName + ".lms.sp";
if(f.startsWith(f2)) {
matched++;
}
counter++;
}
}
if(matched == parts) {
return true;
} else {
return false;
}
}
public static File zipFile(File file, File dir) throws IOException {
WritableByteChannel out = null;
ReadableByteChannel in = null;
FileInputStream source = new FileInputStream(file);
File dest = new File(dir, file.getName() + ".zip");
ZipOutputStream zos = new ZipOutputStream(new FileOutputStream(dest));
dest.deleteOnExit();
int buffer = 4096;
ByteBuffer data = ByteBuffer.allocate(buffer);
try {
zos.putNextEntry(new ZipEntry(file.getName()));
in = Channels.newChannel(source);
out = Channels.newChannel(zos);
int read = in.read(data);
while(read > 0) {
data.flip();
out.write(data);
data.clear();
read = in.read(data);
}
zos.closeEntry();
} finally {
if(zos != null) {
zos.finish();
}
if(out != null)
out.close();
if(in != null)
in.close();
}
return dest;
}
public static File unzipFile(File file, File dir) throws IOException {
WritableByteChannel out = null;
ReadableByteChannel in = null;
ZipEntry entry = null;
ZipFile zipFile = null;
int buffer = 4096;
ByteBuffer data = ByteBuffer.allocate(buffer);
File unzippedFile = null;
try {
zipFile = new ZipFile(file, ZipFile.OPEN_READ);
Enumeration zipFileEntries = zipFile.entries();
// Process each entry
if (zipFileEntries.hasMoreElements()) {
// grab a zip file entry
entry = (ZipEntry) zipFileEntries.nextElement();
String currentEntry = entry.getName();
InputStream input = zipFile.getInputStream(entry);
unzippedFile = new File(dir, currentEntry);
FileOutputStream output = new FileOutputStream(unzippedFile);
in = Channels.newChannel(input);
out = Channels.newChannel(output);
int read = in.read(data);
while(read > 0) {
data.flip();
out.write(data);
data.clear();
read = in.read(data);
}
}
} finally {
if(file != null)
file.delete();
if(zipFile != null)
zipFile.close();
if(out != null)
out.close();
if(in != null)
in.close();
}
return unzippedFile;
}
}
不過最好使用Apache Common 的IO組件。
里面有個(gè)FileUtils，提供了很多很好的方法。
可以參考：
http://commons.apache.org/io/apidocs/index.html