Reputation: 797
For example, in Emoji Char set, U+1F601
is the unicode value for "GRINNING FACE WITH SMILING EYES", and \xF0\x9F\x98\x81
is the UTF-8 bytes value for this character.
\xE2\x9D\xA4
is for heavy black heart, and the unicode is U+2764
.
So my question is, if I have a byte array with value (0xF0, 0x9F, 0x98, 0x81, 0xE2, 0x9D, 0xA4)
, then how I can convert it into Unicode value?
For the above result, what I want is a String array with value "1F601"
and "2764"
.
I know I can write a complex method to do this work, but I hope there is already a library to do this work.
Upvotes: 9
Views: 45051
Reputation: 49
Here is a function to convert UNICODE (ISO_8859_1) to UTF-8
public static String String_ISO_8859_1To_UTF_8(String strISO_8859_1) {
final StringBuilder stringBuilder = new StringBuilder();
for (int i = 0; i < strISO_8859_1.length(); i++) {
final char ch = strISO_8859_1.charAt(i);
if (ch <= 127)
{
stringBuilder.append(ch);
}
else
{
stringBuilder.append(String.format("%02x", (int)ch));
}
}
String s = stringBuilder.toString();
int len = s.length();
byte[] data = new byte[len / 2];
for (int i = 0; i < len; i += 2) {
data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) << 4)
+ Character.digit(s.charAt(i+1), 16));
}
String strUTF_8 =new String(data, StandardCharsets.UTF_8);
return strUTF_8;
}
TEST
String strA_ISO_8859_1_i = new String("الغلاف".getBytes(StandardCharsets.UTF_8), StandardCharsets.ISO_8859_1);
System.out.println("ISO_8859_1 strA est = "+ strA_ISO_8859_1_i + "\n String_ISO_8859_1To_UTF_8 = " + String_ISO_8859_1To_UTF_8(strA_ISO_8859_1_i));
RESULT
ISO_8859_1 strA est = اÙغÙا٠String_ISO_8859_1To_UTF_8 = الغلاف
Upvotes: 0
Reputation: 274
Here is an example using InputStreamReader:
InputStream inputStream = new FileInputStream("utf-8-text.txt");
Reader reader = new InputStreamReader(inputStream,
Charset.forName("UTF-8"));
int data = reader.read();
while(data != -1){
char theChar = (char) data;
data = reader.read();
}
reader.close();
Upvotes: 0
Reputation: 1503409
So my question is, if I have a byte array with value (0xF0, 0x9F, 0x98, 0x81), then how I can convert it into Unicode value?
Simply call the String
constructor specifying the data and the encoding:
String text = new String(bytes, "UTF-8");
You can specify a Charset
instead of the name of the encoding - I like Guava's simple Charsets
class, which allows you to write:
String text = new String(bytes, Charsets.UTF_8);
Or for Java 7, use StandardCharsets
without even needing Guava:
String text = new String(bytes, StandardCharsets.UTF_8);
Upvotes: 8
Reputation: 3491
Simply use String
class:
byte[] bytesArray = new byte[10]; // array of bytes (0xF0, 0x9F, 0x98, 0x81)
String string = new String(bytesArray, Charset.forName("UTF-8")); // covert byteArray
System.out.println(string); // Test result
Upvotes: 1