java 判断二进制文件的方法

public static boolean isBinary(File file)   { boolean isBinary = false; try { FileInputStream fin = new FileInputStream(file); long len = file.length();   for (int j = 0; j < (int) len; j++) { int t = fin.read(); if (t < 32 && t != 9 && t != 10 && t != 13) { isBinary = true; break; } } } catch (Exception e) { e.printStackTrace(); } return isBinary; }