gbk转utf-8

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");


            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;
    }

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