如何将不可打印的字符或字符串转换为十六进制？ [英] How to convert non-printable character or string to hex?

问题描述

我有一个包含下一个十六进制格式的字符串：
5f e8 d0 7b c0 f7 54 07 fb e4 20 f5 b8 10 67 a9

你知道这只是十六进制，我需要从String中获得这个十六进制表示。字符串看起来像：
ED> @@ 2.W.W'KJ％z_ {T g

因此，如何从ED @@ 2.W.W'KJ％z_ {T ghex presentation5f e8 d0 7b c0 f7 54 07 fb e4 20 f5 b8 10 67 a9？这是不可打印的字符，所以我不能使用它：

 
 public static String stringToHex（String arg）{
 return String.format（ ％x，新的BigInteger（arg.getBytes（）））; 
} 
 

结果：-10404282104042104042104042104042104042c7eea21040428189104042104042f5。
而且这也给我一些奇怪的东西：

 
 System.out.println（String.format（％h，Integer.toHexString （buff.charAt（0））））; 
 

结果：6d1。

此代码有时可用。数据来自套接字（因为我需要以String的形式获取许多答案，并且只有这个Auth Challenge是十六进制的）。

解决方案

这是正确的解决方案：

  public static String toHexString（byte [] bytes）{
 StringBuilder out = new的StringBuilder（）; 
 for（byte b：bytes）{
 out.append（String.format（％02X，b）+）; 
} 
返回out.toString（）; 
 
 $ / code> 

使用 Integer.toHexString（）是错误的：



1. 它不会将前导零添加到字节0x01 - 0x0F


2. 以2的补码表示形式将字节0x80 - 0xFF打印为负整数
   
   

   I have String which contain the next hex presentation: "5f e8 d0 7b c0 f7 54 07 fb e4 20 f5 b8 10 67 a9"

   You understand that this is just hex and I need to get this hex presentation from String. String looks like: "ED>@@2.W.W'KJ%z_{T g"

   So, how to get from "ED>@@2.W.W'KJ%z_{T g" hex presentation "5f e8 d0 7b c0 f7 54 07 fb e4 20 f5 b8 10 67 a9"? This is unprintable characters so I can't use this:

       public static String stringToHex(String arg) {
           return String.format("%x", new BigInteger(arg.getBytes()));
       }
   

   result: -10404282104042104042104042104042104042c7eea21040428189104042104042f5. And also this returns me something strange:

   System.out.println(String.format("%h", Integer.toHexString(buff.charAt(0))));
   

   result: 6d1.

   And this code sometimes works. The data comes from socket (as String because I need to get many answers as String and only this Auth Challenge as hex).

   解决方案

   This is the correct solution:

   public static String toHexString(byte[] bytes) {  
       StringBuilder out = new StringBuilder();
       for (byte b: bytes) {
           out.append(String.format("%02X", b) + " ");
       }
       return out.toString();
   }
   

   Solution with Integer.toHexString() is wrong for the following reasons:

   1. It doesn't add leading zero to bytes 0x01 - 0x0F
   2. It prints bytes 0x80 - 0xFF as negative integers in 2's complement representation

   这篇关于如何将不可打印的字符或字符串转换为十六进制？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！