Java 中如何把文件（file）转化字节数组呢？
方式一：
Java代码
- /**
- * 文件转换为二进制数组
- *
- * @param file 文件对象
- * @return
- * @throws IOException
- */
- public static byte[] fileTobytes(final File file) throws IOException {
- byte[] data = null;
- if (file.exists()) {
- FileInputStream fileInputStream = new FileInputStream(file);
- int length = fileInputStream.available();
- data = new byte[length];
- fileInputStream.read(data);
- fileInputStream.close();
- }
- return data;
- }
方式二：
Java代码
- /***
- * read file ,convert file to byte array
- *
- * @param file
- * @return
- * @throws IOException
- */
- public static byte[] readBytes4file(File file) throws IOException{
- BufferedInputStream in = new BufferedInputStream(new FileInputStream(file));
- ByteArrayOutputStream out = new ByteArrayOutputStream(1024);
- // System.out.println("Available bytes:" + in.available());
- byte[] temp = new byte[1024];
- int size = 0;
- while ((size = in.read(temp)) != -1) {
- out.write(temp, 0, size);
- }
- in.close();
- byte[] content = out.toByteArray();
- return content;
- }
