[JAVA] HttpURLConnection POST 호출 예제

public String postHttp(String urlString, String parameters, String encoding) throws IOException, Exception {
    if (encoding == null || encoding.length() == 0) {
        encoding = “UTF-8”;
    }
    
    HttpURLConnection ucon = null;
    String result = null;
    
    OutputStream os = null;
    DataOutputStream dos = null;
    InputStream is = null;
    
    try {
        URL url = new URL(urlString);
        
        ucon = (HttpURLConnection) url.openConnection();
        
        ucon.setRequestMethod(“POST”);
        
        ucon.setDoOutput(true);
        ucon.setConnectTimeout(3 * 1000);
        ucon.setReadTimeout(3 * 1000);
        ucon.setUseCaches(false);
        
        ucon.setRequestProperty(“Accept-Language”, encoding);
        ucon.setRequestProperty(“connection”, “Keep-Alive”);
        ucon.setRequestProperty(“cache-control”, “no-cache”);
        ucon.setRequestMethod(“POST”);
        
        os = ucon.getOutputStream();
        
        dos = new DataOutputStream(os);
        dos.writeBytes(parameters);
        dos.flush();
        dos.close();
        
        int status = ucon.getResponseCode();
        
        if (status >= HttpURLConnection.HTTP_OK || status < HttpURLConnection.HTTP_MULT_CHOICE) {
            is = ucon.getInputStream();
            StringBuffer buf = new StringBuffer();
            
            int c = 0;
            
            while ((c = is.read()) != -1) {
                buf.append((char) c);
            }
            
            result = buf.toString();
            result = new String(result.getBytes(“iso-8859-1”));
        }
        ucon.disconnect();
        
    } catch (NullPointerException e) {
        throw e;
        
    } catch (Exception e) {
        throw e;
    
    } finally {
        try {
            if (is != null) {
                is.close();
            }
        } catch (IOException e) {
        } catch (Exception e) {
        }
        
        try {
            if (dos != null) {
                dos.close();
            }
        } catch (IOException e) {
        } catch (Exception e) {
        }
        
        try {
            if (os != null) {
                os.close();
            }
        } catch (IOException e) {
        } catch (Exception e) {
        }
        
        try {
            if (ucon != null) {
                ucon.disconnect();
            }
        } catch (NullPointerException e) {
        } catch (Exception e) {
        }
    }
    
    return result;
}