在拷贝数据的时候，单线程文件拷贝才是最快的方法
目前了解最快的方法是(文件越大该方法越有优势):
private static void fileTransferCopy(File source, File target) {
FileChannel in = null;
FileChannel out = null;
FileInputStream inStream = null;
FileOutputStream outStream = null;
try {
inStream = new FileInputStream(source);
outStream = new FileOutputStream(target);
in = inStream.getChannel();
out = outStream.getChannel();
in.transferTo(0, in.size(), out);
} catch (IOException e) {
e.printStackTrace();
} finally {
close(inStream);
close(in);
close(outStream);
close(out);
}
}
如果需要监测复制进度，可以用这个方法(因为要留意buffer的大小，对速度有很大影响):
private static void fileTransferCopy(File source, File target) {
FileChannel in = null;
FileChannel out = null;
FileInputStream inStream = null;
FileOutputStream outStream = null;
try {
inStream = new FileInputStream(source);
outStream = new FileOutputStream(target);
in = inStream.getChannel();
out = outStream.getChannel();
ByteBuffer buffer = ByteBuffer.allocate(4096);
while (in.read(buffer) != -1) {
buffer.flip();
out.write(buffer);
buffer.clear();
}
} catch (IOException e) {
e.printStackTrace();
} finally {
close(inStream);
close(in);
close(outStream);
close(out);
}
}
常用的方法1是:
private static void bufferedStreamCopy(File source, File target) {
InputStream fis = null;
OutputStream fos = null;
try {
fis = new BufferedInputStream(new FileInputStream(source));
fos = new BufferedOutputStream(new FileOutputStream(target));
byte[] buf = new byte[4096];
int i;
while ((i = fis.read(buf)) != -1) {
fos.write(buf, 0, i);
}
}
catch (Exception e) {
e.printStackTrace();
} finally {
close(fis);
close(fos);
}
}
常用的方法2是:
private static void bufferStreamCopy(File source, File target) {
InputStream fis = null;
OutputStream fos = null;
try {
fis = new FileInputStream(source);
fos = new FileOutputStream(target);
byte[] buf = new byte[4096];
int i;
while ((i = fis.read(buf)) != -1) {
fos.write(buf, 0, i);
}
}
catch (Exception e) {
e.printStackTrace();
} finally {
close(fis);
close(fos);
}
}
以上是根据网上查找的一些方法自己尝试后的结论，要是有不当之处，敬请斧正……