Java File 文件读取

/**
 * 文件读取 （单文件读取和多文件读取 ）
 */
public class FileRead {
    public static void main(String[] args) throws Exception {
        multiByteRead();
    }

    //单字节读取
    public static void singleByteRead() throws Exception {
        //读取该文件
        File file = new File("D://fileTest//zip//2022-07-18_20-10-52.jpg");
        FileInputStream fileInputStream = new FileInputStream(file);
        FileOutputStream fileOutputStream = new FileOutputStream("D://fileTest//zip//hjj.jpg");
        int index = 0;
        while ((index = fileInputStream.read()) != -1) {
            fileOutputStream.write(index);
        }
        fileInputStream.close();
        fileOutputStream.close();
    }

    //多字节读取
    public static void multiByteRead() throws Exception {
        //读取该文件
        File file = new File("D://fileTest//zip//2022-07-18_20-10-52.jpg");
        FileInputStream fileInputStream = new FileInputStream(file);
        FileOutputStream fileOutputStream = new FileOutputStream("D://fileTest//zip//hjj1.jpg");
        int index = 0;
        byte[] bytes = new byte[1024];
        while ((index = fileInputStream.read(bytes)) != -1) {
            fileOutputStream.write(bytes, 0, index);
        }
        fileInputStream.close();
        fileOutputStream.close();
    }
}