GBK编码转成UTF-8编码

从GBK编码转成UTF-8编码

private String gbk2utf8(String gbkText) {
    	char[] c = gbkText.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);
    		StringBuffer sb = new StringBuffer();
    		//补零
            for(int j=0, len=16-word.length(); 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();
            fullByte[i*3] = b0;
            fullByte[i*3+1] = b1;
            fullByte[i*3+2] = b2;
    	}
    	String utf8Text = "";
    	try {
    		utf8Text = new String(fullByte, "UTF-8");
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		}
    	return utf8Text;
    }