Question

如何将byte 转化为十六进制

Answer 1

方法/步骤
byte数组转换成16进制字符串String：
public class CommonUtil {
/**
* byte数组转换成16进制字符串
* @param src
* @return
*/
public static String bytesToHexString(byte[] src){
StringBuilder stringBuilder = new StringBuilder();
if (src == null || src.length <= 0) {
return null;
}
for (int i = 0; i < src.length; i++) {
int v = src[i] & 0xFF;
String hv = Integer.toHexString(v);
if (hv.length() < 2) {
stringBuilder.append(0);
}
stringBuilder.append(hv);
}
return stringBuilder.toString();
}
}
byte数组转换成16进制字符数组String[]：
public class CommonUtil {
/**
* byte数组转换成16进制字符数组
* @param src
* @return
*/
public static String[] bytesToHexStrings(byte[] src){
if (src == null || src.length <= 0) {
return null;
}
String[] str = new String[src.length];

for (int i = 0; i < src.length; i++) {
int v = src[i] & 0xFF;
String hv = Integer.toHexString(v);
if (hv.length() < 2) {
str[i] = "0";
}
str[i] = hv;
}
return str;
}
}
测试最终结果：
public static void main(String[] args) {
byte[] src = new byte[]{ 1, 2, 3, 4 };
System.out.println( bytesToHexString(src) );
System.out.println( bytesToHexStrings(src)[2] );
}