您可以bytes[]从转换后的字符串中进行重构，这是一种实现方法：
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);
}
另一种方法是使用DatatypeConverter，从javax.xml.bind包：
public String fromHex(String hex) throws UnsupportedEncodingException {
hex = hex.replaceAll("^(00)+", "");
byte[] bytes = DatatypeConverter.parseHexBinary(hex);
return new String(bytes, "UTF-8");
}
单元测试以验证：
@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：领先剥离00的fromHex仅仅是必要的，因为的"%040x"你的填充toHex方法。如果您不介意将其替换为简单的%x，则可以将此行放在fromHex：
hex = hex.replaceAll("^(00)+", "");
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