htmlで中国語をutf-8に変換する方法

gcc src/dirent_ls -Iinclude -o bin/dirent_ls 

public static String UTF8_html_conv(String str){
StringBuffer stbPreemptionArg = new StringBuffer();
for(int i = 0;i<str.length();i++){
if (str.codePointAt(i) > 255){
stbPreemptionArg.append("&#x"+Integer.toString(str.charAt(i), 16)+";");
}else{
stbPreemptionArg.append(str.charAt(i));
}
}
return stbPreemptionArg.toString();
}

func CovertToHtml(src string) string{
    rs := []rune(src)
    htmlUtf8 := ""
    for _, r := range rs {
        rint := int(r)
        if rint < 128 {
            htmlUtf8 += string(r)
        } else {
            //utf8 = "\\u"+strconv.FormatInt(int64(rint), 16)
            htmlUtf8 += "&#x"+strconv.FormatInt(int64(rint), 16) + ";"
        }
    }
return htmlUtf8
}