[英]Convert UUID to hex string and vice versa
格式为“ b2f0da40ec2c11e00000242d50cf1fbf”的UUID已转换(参见下面的代码段)为十六进制字符串,如62326630646134306563326331316530303030303234326326435435366366666666666.6663666266。但是这样做很难,有什么帮助吗?
byte[] bytes = uuid.getBytes("UTF-8");
StringBuilder hex = new StringBuilder(bytes.length* 2);
Formatter fmt = new Formatter(hex);
for (byte b : bytes)
fmt.format("%x", b);
final String input = "6232663064613430656332633131653030303030323432643530636631666266";
System.out.println("input: " + input);
final StringBuilder result = new StringBuilder();
for (int i = 0; i < input.length(); i += 2) {
final String code = input.substring(i, i + 2);
final int code2 = Integer.parseInt(code, 16);
result.append((char)code2);
}
System.out.println("result: " + result);
它打印:
input: 6232663064613430656332633131653030303030323432643530636631666266
result: b2f0da40ec2c11e00000242d50cf1fbf
干得好:
import java.util.Formatter;
class Test {
public static void main(String[] args) {
String uuid = "b2f0da40ec2c11e00000242d50cf1fbf";
byte[] bytes = uuid.getBytes();
StringBuilder hex = new StringBuilder(bytes.length * 2);
Formatter fmt = new Formatter(hex);
for (byte b : bytes) {
fmt.format("%x", b);
}
System.out.println(hex);
/******** reverse the process *******/
/**
* group the bytes in couples
* convert them to integers (base16)
* and store them as bytes
*/
for (int i = 0; i < bytes.length; i++) {
bytes[i] = (byte) Integer.parseInt(hex.substring(2 * i, 2 * i + 2), 16);
}
/**
* build a string from the bytes
*/
String original = new String(bytes);
System.out.println(original);
}
}
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