public static void main(String[] args) {
    String clientId = "YOUR_CLIENT_ID";//애플리케이션 클라이언트 아이디값";
    String clientSecret = "YOUR_CLIENT_SECRET";//애플리케이션 클라이언트 시크릿값";
    try {
        String text = URLEncoder.encode("만나서 반갑습니다.", "UTF-8");
        String apiURL = "https://openapi.naver.com/v1/language/translate";
        URL url = new URL(apiURL);
        HttpURLConnection con = (HttpURLConnection)url.openConnection();
        con.setRequestMethod("POST");
        con.setRequestProperty("X-Naver-Client-Id", clientId);
        con.setRequestProperty("X-Naver-Client-Secret", clientSecret);
        // post request
        String postParams = "source=ko&target=en&text=" + text;
        con.setDoOutput(true);
        DataOutputStream wr = new DataOutputStream(con.getOutputStream());
        wr.writeBytes(postParams);
        wr.flush();
        wr.close();
        int responseCode = con.getResponseCode();
        BufferedReader br;
        if(responseCode==200) { // 정상 호출
            br = new BufferedReader(new InputStreamReader(con.getInputStream()));
        } else {  // 에러 발생
            br = new BufferedReader(new InputStreamReader(con.getErrorStream()));
        }
        String inputLine;
        StringBuffer response = new StringBuffer();
        while ((inputLine = br.readLine()) != null) {
            response.append(inputLine);
        }
        br.close();
        System.out.println(response.toString());
    } catch (Exception e) {
        System.out.println(e);
    }
} }