java 读取本地文件并转换为byte数组

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private byte[] InputStream2ByteArray(String filePath) throws IOException {       InputStream in = new FileInputStream(filePath);     byte[] data = toByteArray(in);     in.close();       return data; }   private byte[] toByteArray(InputStream in) throws IOException {       ByteArrayOutputStream out = new ByteArrayOutputStream();     byte[] buffer = new byte[1024 * 4];     int n = 0;     while ((n = in.read(buffer)) != -1) {         out.write(buffer, 0, n);     }     return out.toByteArray(); }