java Unicode 转 utf-8 汉字

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例子：

Unicode：\u9ed1\u9f99\u6c5f 转化为汉字

java方法：

public static String unicodeToChina(String str) {          Charset set = Charset.forName("UTF-16");          Pattern p = Pattern.compile("\\\\u([0-9a-fA-F]{4})");          Matcher m = p.matcher( str );          int start = 0 ;          int start2 = 0 ;          StringBuffer sb = new StringBuffer();          while( m.find( start ) ) {              start2 = m.start() ;              if( start2 > start ){                  String seg = str.substring(start, start2) ;                  sb.append( seg );              }              String code = m.group( 1 );              int i = Integer.valueOf( code , 16 );              byte[] bb = new byte[ 4 ] ;              bb[ 0 ] = (byte) ((i >> 8) & 0xFF );              bb[ 1 ] = (byte) ( i & 0xFF ) ;              ByteBuffer b = ByteBuffer.wrap(bb);              sb.append( String.valueOf( set.decode(b) ).trim() );              start = m.end() ;          }          start2 = str.length() ;          if( start2 > start ){              String seg = str.substring(start, start2) ;              sb.append( seg );          }          return sb.toString() ;      }

测试方法：

public static void main(String[] args) {String test = unicodeToChina("\u9ed1\u9f99\u6c5f");System.out.println(test);}

输出结果：

黑龙江

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