java GDK转UTF-8

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public class ConverFromGBKToUTF8 {
public static void main(String[] args){

try {

         ConverFromGBKToUTF8 convert = new ConverFromGBKToUTF8();
         byte [] fullByte = convert.gbk2utf8("<!合肥市出租%&%##￥#%#…………长途电路受阴天fsfjoisjewrjoiewr----——_?////||||||>");
         String fullStr = new String(fullByte, "UTF-8");
         System.out.println("string from GBK to UTF-8 byte: " + fullStr);

     } catch (Exception e) {
      e.printStackTrace();
     }
}

public byte[] gbk2utf8(String chenese){
char c[] = chenese.toCharArray();
        byte [] fullByte =new byte[3*c.length];
        for(int i=0; i<c.length; i++){
         int m = (int)c[i];
         String word = Integer.toBinaryString(m);
//         System.out.println(word);

         StringBuffer sb = new StringBuffer();
         int len = 16 - word.length();
         //补零
         for(int j=0; j<len; j++){
          sb.append("0");
         }
         sb.append(word);
         sb.insert(0, "1110");
         sb.insert(8, "10");
         sb.insert(16, "10");

// System.out.println(sb.toString());

         String s1 = sb.substring(0, 8);
         String s2 = sb.substring(8, 16);
         String s3 = sb.substring(16);

         byte b0 = Integer.valueOf(s1, 2).byteValue();
         byte b1 = Integer.valueOf(s2, 2).byteValue();
         byte b2 = Integer.valueOf(s3, 2).byteValue();
         byte[] bf = new byte[3];
         bf[0] = b0;
         fullByte[i*3] = bf[0];
         bf[1] = b1;
         fullByte[i*3+1] = bf[1];
         bf[2] = b2;
         fullByte[i*3+2] = bf[2];

        }
        return fullByte;
}
    }