文件拷贝-上传文件

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import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.nio.ByteBuffer;import java.nio.channels.FileChannel;public final class MyUtil {    private MyUtil() {        throw new AssertionError();    }    public static void fileCopy(String source, String target) throws IOException {        try (InputStream in = new FileInputStream(source)) {            try (OutputStream out = new FileOutputStream(target)) {                byte[] buffer = new byte[4096];                int bytesToRead;                while((bytesToRead = in.read(buffer)) != -1) {                    out.write(buffer, 0, bytesToRead);                }            }        }    }    public static void fileCopyNIO(String source, String target) throws IOException {        try (FileInputStream in = new FileInputStream(source)) {            try (FileOutputStream out = new FileOutputStream(target)) {                FileChannel inChannel = in.getChannel();                FileChannel outChannel = out.getChannel();                ByteBuffer buffer = ByteBuffer.allocate(4096);                while(inChannel.read(buffer) != -1) {                    buffer.flip();                    outChannel.write(buffer);                    buffer.clear();                }            }        }    }}
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