HttpURLConnection POST 통신

1. Form values 전달

@Test
public void postTemplate() {
	String response = null;

	try {
		String urlPath = "https://webhook.site/{your_unique_url}";
		URL url = new URL(urlPath);
		HttpURLConnection con = (HttpURLConnection) url.openConnection();

		con.setRequestMethod("POST");
		con.setDoOutput(true);

		String param = "param1=a";
		param += "&param2=b";
		param += "&param3=c";
		param += "&param4=d";

		OutputStream os = con.getOutputStream();
		os.write(param.getBytes("utf-8"));
		os.flush();
		os.close();

		BufferedReader br = new BufferedReader(new InputStreamReader(con.getInputStream(), "euc-kr"));
		StringBuffer sb = new StringBuffer();
		String inputLine;

		while ((inputLine = br.readLine()) != null) {
			sb.append(inputLine);
		}
		br.close();

		response = sb.toString();
	} catch (IOException e) {
		e.printStackTrace();
	}

	System.out.println(response);
}

  - https://webhook.site/를 통해 전송결과 확인

 

2. JSON 전달

 - pom.xml json-simple dependency 추가

<dependency>
  <groupId>com.googlecode.json-simple</groupId>
  <artifactId>json-simple</artifactId>
  <version>1.1.1</version>
</dependency>

public void postJSONTemplate() {
	String response = null;

	try {
		String urlPath = "https://webhook.site/{your_unique_url}";
		URL url = new URL(urlPath);
		HttpURLConnection con = (HttpURLConnection) url.openConnection();

		con.setRequestMethod("POST");
		con.setRequestProperty("Content-type", "application/json");
		con.setDoOutput(true);

		JSONObject jsonObject = new JSONObject();
		jsonObject.put("param1", "a");
		jsonObject.put("param2", "b");
		jsonObject.put("param3", "c");

		OutputStream os = con.getOutputStream();
		os.write(jsonObject.toString().getBytes("utf-8"));
		os.flush();
		os.close();

		BufferedReader br = new BufferedReader(new InputStreamReader(con.getInputStream(), "euc-kr"));
		StringBuffer sb = new StringBuffer();
		String inputLine;

		while ((inputLine = br.readLine()) != null) {
			sb.append(inputLine);
		}
		br.close();

		response = sb.toString();
	} catch (IOException e) {
		e.printStackTrace();
	}

	System.out.println(response);
}

  - https://webhook.site/를 통해 전송결과 확인