Java Post JSON data

GSON library is good tool to convert data to JSON format 1. Add GSON dependency, current latest version is 2.8.0

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<dependency>     <groupId>com.google.code.gson</groupId>     <artifactId>gson</artifactId>     <version>2.8.0</version> </dependency>

2. The data sender util look like:

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import java.io.BufferedReader; import java.io.DataOutputStream; import java.io.InputStreamReader; import java.net.HttpURLConnection; import java.net.URL; import java.util.logging.Level; import java.util.logging.Logger;   import com.google.gson.Gson;   public class HttpRequestSender {       private static final Logger LOGGER = Logger.getLogger(HttpRequestSender.class.getName());       public static int postJsonData(String url, Object data, int connectionTimeout, int readTimeout, StringBuffer response) {         int responseCode = 0;         Gson gson = new Gson();         StringBuilder sb = new StringBuilder();         sb.append("data=").append(gson.toJson(data));         long startTime = System.currentTimeMillis();         try {             URL urlObj = new URL(url);             HttpURLConnection conn = (HttpURLConnection) urlObj.openConnection();             conn.setConnectTimeout(connectionTimeout);             conn.setReadTimeout(readTimeout);             conn.setRequestMethod("POST");             conn.setInstanceFollowRedirects(false);             conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");             conn.setRequestProperty("charset", "UTF-8");             byte[] postData = sb.toString().getBytes("UTF-8");             conn.setRequestProperty("content-length", postData.length + "");             conn.setDoOutput(true);             try (DataOutputStream wr = new DataOutputStream(conn.getOutputStream())) {                 wr.write(postData);                 wr.flush();             }             responseCode = conn.getResponseCode();             if (response != null) {                 try (BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()))) {                     String line = reader.readLine();                     while (line != null) {                         response.append(line);                         line = reader.readLine();                     }                 }             }         } catch (Exception e) {             LOGGER.log(Level.SEVERE, "Error while posting data " + String.valueOf(data) + " to " + url, e);         }         LOGGER.log(Level.INFO, "Posted {0} to {1} took {2} ms", new Object[] { String.valueOf(data), url, (System.currentTimeMillis() - startTime) });         return responseCode;     } }