如何在 Java 中将 UTF-8 转换为 unicode？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/18606523/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
How to convert UTF-8 to unicode in Java?
提问by XWang
For example, in Emoji Char set, U+1F601is the unicode value for "GRINNING FACE WITH SMILING EYES", and \xF0\x9F\x98\x81is the UTF-8 bytes value for this character.
例如，在 Emoji 字符集中，U+1F601是“GRINNING FACE WITH SMILING EYES”的 unicode 值，是该字符\xF0\x9F\x98\x81的 UTF-8 字节值。
\xE2\x9D\xA4is for heavy black heart, and the unicode is U+2764.
\xE2\x9D\xA4是重黑心，unicode 是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?
所以我的问题是，如果我有一个带有 value 的字节数组(0xF0, 0x9F, 0x98, 0x81, 0xE2, 0x9D, 0xA4)，那么如何将其转换为 Unicode 值？
For the above result, what I want is a String array with value "1F601"and "2764".
对于上面的结果，我想要的是一个带有值"1F601"和的字符串数组"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.
我知道我可以编写一个复杂的方法来完成这项工作，但我希望已经有一个库来完成这项工作。
回答by Jon Skeet
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?
所以我的问题是，如果我有一个值为 (0xF0, 0x9F, 0x98, 0x81) 的字节数组，那么我如何将其转换为 Unicode 值？
Simply call the Stringconstructor specifying the data and the encoding:
只需调用String指定数据和编码的构造函数：
String text = new String(bytes, "UTF-8");
You can specify a Charsetinstead of the name of the encoding - I like Guava's simple Charsetsclass, which allows you to write:
您可以指定一个Charset而不是编码的名称 - 我喜欢Guava的简单Charsets类，它允许您编写：
String text = new String(bytes, Charsets.UTF_8);
Or for Java 7, use StandardCharsetswithout even needing Guava:
或者对于 Java 7，StandardCharsets甚至不需要 Guava 就可以使用：
String text = new String(bytes, StandardCharsets.UTF_8);
回答by Ashwani
Simply use Stringclass:
只需使用String类：
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
回答by Mr.Green
Here is an example using InputStreamReader:
下面是一个使用 InputStreamReader 的例子：
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();
参考：Java I18N 示例
回答by che.moor
Here is a function to convert UNICODE (ISO_8859_1) to UTF-8
这是一个将 UNICODE (ISO_8859_1) 转换为 UTF-8 的函数
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
测试
String strA_ISO_8859_1_i = new String("??????".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
结果
ISO_8859_1 strA est = ?§ù?où?§ù String_ISO_8859_1To_UTF_8 = ??????
ISO_8859_1 strA est = ?§ù?où?§ù String_ISO_8859_1To_UTF_8 = ??????
