对html实体编码进行解码

例如  ＆＃２７８６１； 解码为 汉字 ‘法’

 

private static String decodeUnicode(final String dataStr) {
  int start = 0;
  int end = 0;
  final StringBuffer buffer = new StringBuffer();
  while (start > -1) {
   int system = 10;// 进制
   if (start == 0) {
    int t = dataStr.indexOf("&#");
    if (start != t)
     start = t;
   }
   end = dataStr.indexOf(";", start + 2);
   String charStr = "";
   if (end != -1) {
    charStr = dataStr.substring(start + 2, end);
    // 判断进制
    char s = charStr.charAt(0);
    if (s == 'x' || s == 'X') {
     system = 16;
     charStr = charStr.substring(1);
    }
   }
   // 转换
   try {
    char letter = (char) Integer.parseInt(charStr, system);
    buffer.append(new Character(letter).toString());
   } catch (NumberFormatException e) {
    e.printStackTrace();
   }
   // 处理当前unicode字符到下一个unicode字符之间的非unicode字符
   start = dataStr.indexOf("&#", end);
   if (start - end > 1) {
    buffer.append(dataStr.substring(end + 1, start));
   }
   // 处理最后面的非unicode字符
   if (start == -1) {
    int length = dataStr.length();
    if (end + 1 != length) {
     buffer.append(dataStr.substring(end + 1, length));
    }
   }
  }
  return buffer.toString();
 }