将十六进制转换为字符串

问题描述

将字符串转换为十六进制我使用：

  public String toHex（String arg）{
 return String .format（％040x，新的BigInteger（1，arg.getBytes（UTF-8）））; 
} 
  

这里在顶部答案的答案中概述：

我如何做相反的事情，即十六进制字符串？

解决方案

您可以从转换后的字符串中重新生成 bytes [] ，这里有一个方法可以实现：

  public String fromHex（String hex）throws UnsupportedEncodingException {
 hex = hex.replaceAll（^（00）+，）; 
 byte [] bytes = new byte [hex.length（）/ 2]; 
 for（int i = 0; i< hex.length（）; i + = 2）{
 bytes [i / 2] =（byte）（（Character.digit（hex.charAt i），16）} 
返回新的字符串（字节）; 
} 
  

另一种方法是使用 DatatypeConverter javax.xml.bind 包：

  public String fromHex（String hex）throws UnsupportedEncodingException {
 hex = hex.replaceAll（^（00）+，）; 
 byte [] bytes = DatatypeConverter.parseHexBinary（hex）; 
返回新的字符串（字节，UTF-8）; 
 
  

单元测试验证：

  @Test 
 public void test（）throws UnsupportedEncodingException {
 String [] samples = {
hello，
你所有的基地现在属于我们，欢迎我们的机器霸主
; 
 for（String sample：samples）{
 assertEquals（sample，fromHex（toHex（sample）））; 
 
 
 code 
 
 
 
注意：剥离前导 fromHex 中添加> 00 ，因为您的％040x padding  toHex 方法。 
如果你不介意用一个简单的％x ，
来代替它，那么你可以把这行放在 fromHex ：
 
To convert String to Hexadecimal i am using:
public String toHex(String arg) {
    return String.format("%040x", new BigInteger(1, arg.getBytes("UTF-8")));
}
This is outlined in the top-voted answer here:Converting A String To Hexadecimal In Java
How do i do the reverse i.e Hexadecimal to String?
 解决方案 
You can reconstruct bytes[] from the converted string,here's one way to do it:
public String fromHex(String hex) throws UnsupportedEncodingException {
    hex = hex.replaceAll("^(00)+", "");
    byte[] bytes = new byte[hex.length() / 2];
    for (int i = 0; i < hex.length(); i += 2) {
        bytes[i / 2] = (byte) ((Character.digit(hex.charAt(i), 16) << 4) + Character.digit(hex.charAt(i + 1), 16));
    }
    return new String(bytes);
}
Another way is using DatatypeConverter, from javax.xml.bind package:
public String fromHex(String hex) throws UnsupportedEncodingException {
    hex = hex.replaceAll("^(00)+", "");
    byte[] bytes = DatatypeConverter.parseHexBinary(hex);
    return new String(bytes, "UTF-8");
}
Unit tests to verify:
@Test
public void test() throws UnsupportedEncodingException {
    String[] samples = {
            "hello",
            "all your base now belongs to us, welcome our machine overlords"
    };
    for (String sample : samples) {
        assertEquals(sample, fromHex(toHex(sample)));
    }
}
Note: the stripping of leading 00 in fromHex is only necessary because of the "%040x" padding in your toHex method.If you don't mind replacing that with a simple %x,then you could drop this line in fromHex:
                        
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