IDEA默认的文件位置是当前项目的根目录
import com.sun.imageio.spi.InputStreamImageInputStreamSpi;
import java.io.*;
public class IOTestMain {
public static void main(String[] args) {
FileInputStream fis = null;
FileOutputStream fos = null;
try {
fis = new FileInputStream("st.xlsx");
fos = new FileOutputStream("aaaa.xlsx");
byte[] bytes = new byte[1024 * 1024];
int readCount = 0;
while ((readCount = fis.read(bytes)) != -1) {
fos.write(bytes, 0, readCount);
}
fos.flush();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (fis != null) {
try {
fis.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (fos != null) {
try {
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}