[英]Convert Hexadecimal to String
要將String轉換為十六進制,我正在使用:
public String toHex(String arg) {
return String.format("%040x", new BigInteger(1, arg.getBytes("UTF-8")));
}
這在頂部投票的答案中概述: 在Java中將字符串轉換為十六進制
我如何反向,即十六進制到字符串?
您可以從轉換后的字符串重建bytes[]
,這是一種方法:
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);
}
另一種方法是使用來自javax.xml.bind
包的DatatypeConverter
:
public String fromHex(String hex) throws UnsupportedEncodingException {
hex = hex.replaceAll("^(00)+", "");
byte[] bytes = DatatypeConverter.parseHexBinary(hex);
return new String(bytes, "UTF-8");
}
單元測試驗證:
@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)));
}
}
注意:由於toHex
方法中的"%040x"
填充,僅需要從fromHex
去除前導00
。 如果您不介意用簡單的%x
替換它,那么您可以將此行放在fromHex
:
hex = hex.replaceAll("^(00)+", "");
String hexString = toHex("abc");
System.out.println(hexString);
byte[] bytes = DatatypeConverter.parseHexBinary(hexString);
System.out.println(new String(bytes, "UTF-8"));
輸出:
0000000000000000000000000000000000616263
abc
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