Java 代码片段

16进制转字符串

private static String hexStringToString(String s) {
        if (s == null || s.equals("")) {
            return null;
        }
        s = s.replace(" ", "");
        s = s.replace("0x", "");
        byte[] baKeyword = new byte[s.length() / 2];
        for (int i = 0; i < baKeyword.length; i++) {
            baKeyword[i] = (byte) (0xff & Integer.parseInt(s.substring(i * 2, i * 2 + 2), 16));
        }
        return new String(baKeyword, StandardCharsets.UTF_8);
    }

文件复制

File file = getFile(cfg);
FileUtils.copyFile(file, cfg.getResponse().getOutputStream());
int n;
FileInputStream fis = new FileInputStream(file);
byte[] buffer = new byte[4096];
for (; -1 != (n = fis.read(buffer)); ) {
      cfg.getResponse().getOutputStream().write(buffer, 0, n);
}
file.deleteOnExit();

根据多个字符分割字符串

String s = "123,45;iops，123；，234";
  String[] arr = s.split("[,，;；]");
  for (String a : arr) {
    System.out.print(a + " %%");
}