字符编码之间的转换

public class TranCharset {         private static final String PRE_FIX_UTF = "&#x";       private static final String POS_FIX_UTF = ";";         public TranCharset() {      }         /**       * Translate   charset   encoding   to   unicode       *       * @param sTemp charset   encoding   is   gb2312       * @return charset   encoding   is   unicode       */      public static String XmlFormalize(String sTemp) {           StringBuffer sb = new StringBuffer();             if (sTemp == null || sTemp.equals("")) {               return "";           }           String s = TranCharset.TranEncodeTOGB(sTemp);           for (int i = 0; i < s.length(); i++) {               char cChar = s.charAt(i);               if (TranCharset.isGB2312(cChar)) {                   sb.append(PRE_FIX_UTF);                   sb.append(Integer.toHexString(cChar));                   sb.append(POS_FIX_UTF);               } else {                   switch ((int) cChar) {                       case 32:                           sb.append(" ");                           break;                       case 34:                           sb.append(""");                           break;                       case 38:                           sb.append("&");                           break;                       case 60:                           sb.append("<");                           break;                       case 62:                           sb.append(">");                           break;                       default:                           sb.append(cChar);                   }               }           }           return sb.toString();       }         /**       * 将字符串编码格式转成GB2312       *       * @param str       * @return       */      public static String TranEncodeTOGB(String str) {           try {               String strEncode = TranCharset.getEncoding(str);               String temp = new String(str.getBytes(strEncode), "GB2312");               return temp;           } catch (java.io.IOException ex) {                 return null;           }       }         /**       * 判断输入字符是否为gb2312的编码格式       *       * @param c 输入字符       * @return 如果是gb2312返回真，否则返回假       */      public static boolean isGB2312(char c) {           Character ch = new Character(c);           String sCh = ch.toString();           try {               byte[]   bb = sCh.getBytes("gb2312");               if (bb.length > 1) {                   return true;               }           } catch (java.io.UnsupportedEncodingException ex) {               return false;           }           return false;       }         /**       * 判断字符串的编码       *       * @param str       * @return       */      public static String getEncoding(String str) {           String encode = "GB2312";           try {               if (str.equals(new String(str.getBytes(encode), encode))) {                   String s = encode;                   return s;               }           } catch (Exception exception) {           }           encode = "ISO-8859-1";           try {               if (str.equals(new String(str.getBytes(encode), encode))) {                   String s1 = encode;                   return s1;               }           } catch (Exception exception1) {           }           encode = "UTF-8";           try {               if (str.equals(new String(str.getBytes(encode), encode))) {                   String s2 = encode;                   return s2;               }           } catch (Exception exception2) {           }           encode = "GBK";           try {               if (str.equals(new String(str.getBytes(encode), encode))) {                   String s3 = encode;                   return s3;               }           } catch (Exception exception3) {           }           return "";       }           }