java IO 读写文件
public class Test {public static void main(String[] args) throws Throwable {File file = new File("C:\\Users\\Administrator\\Desktop\\123.jpg");File file2 = new File("C:\\Users\\Administrator\\Desktop\\123_4.jpg");System.out.println("Started:");InputStream in = new FileInputStream(file);OutputStream out = new FileOutputStream(file2);byte[] tempbytes = new byte[1024];while (in.available() > 0) {int read = in.read(tempbytes, 0, tempbytes.length);System.out.println(read);out.write(tempbytes, 0, read);}out.close();in.close();System.out.println("ended:");}}?