如何在java中将UTF-16转换为UTF-32？

我一直在寻找解决方案，但这个主题似乎并不多。 我找到了建议的解决方案：

String unicodeString = new String("utf8 here"); byte[] bytes = String.getBytes("UTF8"); String converted = new String(bytes,"UTF16"); 

但是，从utf8转换为utf16，java不处理“UTF32”，这使得该解决方案不可行。 有没有人知道如何实现这一目标？

Answer 1

Java确实处理UTF-32，尝试此测试

  byte[] a = "1".getBytes("UTF-32"); System.out.println(a.length); 

它会显示数组的lentgh = 4

Answer 2

搜索后我得到了这个工作：

  public static String convert16to32(String toConvert){ for (int i = 0; i < toConvert.length(); ) { int codePoint = Character.codePointAt(toConvert, i); i += Character.charCount(codePoint); //System.out.printf("%x%n", codePoint); String utf32 = String.format("0x%x%n", codePoint); return utf32; } return null; } 

Answer 3

 public static char[] bytesToHex(byte[] raw) { int length = raw.length; char[] hex = new char[length * 2]; for (int i = 0; i < length; i++) { int value = (raw[i] + 256) % 256; int highIndex = value >> 4; int lowIndex = value & 0x0f; hex[i * 2 + 0] = kDigits[highIndex]; hex[i * 2 + 1] = kDigits[lowIndex]; } return hex; } byte[] bytearr = converted.getBytes("UTF-32"); System.out.println("With UTF-32 encoding:\t" + String.valueOf(bytesToHex(bytearr))); System.out.println("With UTF-32 decoding:\t" + new String((bytearr), "UTF-32")); 

Answer 4

在Java 9中，我试过这个并且它有效。

 String myString = "Hello I'm utf-32 string"; String myUtf32String = new String(myString.getBytes(), "UTF-32");