java 在Unicode和UTF-8之间转换

在Unicode和UTF-8之间转换

    try {
// Convert from Unicode to UTF-8
String string = "abcu5639u563b";
byte[] utf8 = string.getBytes("UTF-8");
// Convert from UTF-8 to Unicode
string = new String(utf8, "UTF-8");
} catch (UnsupportedEncodingException e) {
}

    -----------------------------------------------------------------------------------------------------------------

utf-8转unicode

/**
  * utf-8 转换成 unicode
  * @author fanhui
  * 2007-3-15
  * @param inStr
  * @return
  */
 public static String utf8ToUnicode(String inStr) {
        char[] myBuffer = inStr.toCharArray();
        
        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < inStr.length(); i++) {
         UnicodeBlock ub = UnicodeBlock.of(myBuffer[i]);
            if(ub == UnicodeBlock.BASIC_LATIN){
             //英文及数字等
             sb.append(myBuffer[i]);
            }else if(ub == UnicodeBlock.HALFWIDTH_AND_FULLWIDTH_FORMS){
             //全角半角字符
             int j = (int) myBuffer[i] - 65248;
             sb.append((char)j);
            }else{
             //汉字
             short s = (short) myBuffer[i];
                String hexS = Integer.toHexString(s);
                String unicode = "\u"+hexS;
             sb.append(unicode.toLowerCase());
            }
        }
        return sb.toString();
    }
 
 /**
  * unicode 转换成 utf-8
  * @author fanhui
  * 2007-3-15
  * @param theString
  * @return
  */
 public static String unicodeToUtf8(String theString) {
  char aChar;
  int len = theString.length();
  StringBuffer outBuffer = new StringBuffer(len);   for (int x = 0; x < len;) {
   aChar = theString.charAt(x++);
   if (aChar == "\") {
    aChar = theString.charAt(x++);
    if (aChar == "u") {
     // Read the xxxx
     int value = 0;
     for (int i = 0; i < 4; i++) {
      aChar = theString.charAt(x++);
      switch (aChar) {
      case "0":
      case "1":
      case "2":
      case "3":
      case "4":
      case "5":
      case "6":
      case "7":
      case "8":
      case "9":
       value = (value << 4) + aChar - "0";
       break;
      case "a":
      case "b":
      case "c":
      case "d":
      case "e":
      case "f":
       value = (value << 4) + 10 + aChar - "a";
       break;
      case "A":
      case "B":
      case "C":
      case "D":
      case "E":
      case "F":
       value = (value << 4) + 10 + aChar - "A";
       break;
      default:
       throw new IllegalArgumentException(
         "Malformed   \uxxxx   encoding.");
      }
     }
     outBuffer.append((char) value);
    } else {
     if (aChar == "t")
      aChar = " ";
     else if (aChar == "r")
      aChar = " ";
     else if (aChar == "n")
      aChar = " ";
     else if (aChar == "f")
      aChar = "f";
     outBuffer.append(aChar);
    }
   } else
    outBuffer.append(aChar);
  }
  return outBuffer.toString();
 }