1. HttpURLConnection
try {
URL url = new URL("http://api.example.com/data");
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("GET");
int responseCode = connection.getResponseCode();
if (responseCode == HttpURLConnection.HTTP_OK) {
BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
String line;
StringBuilder response = new StringBuilder();
while ((line = reader.readLine()) != null) {
response.append(line);
}
reader.close();
System.out.println(response.toString());
} else {
System.out.println("Request failed with response code: " + responseCode);
}
} catch (IOException e) {
e.printStackTrace();
}
2. Apache HttpClient
CloseableHttpClient httpClient = HttpClients.createDefault();
HttpGet httpGet = new HttpGet("http://api.example.com/data");
try (CloseableHttpResponse response = httpClient.execute(httpGet)) {
if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
HttpEntity entity = response.getEntity();
String responseBody = EntityUtils.toString(entity);
System.out.println(responseBody);
} else {
System.out.println("Request failed with response code: " + response.getStatusLine().getStatusCode());
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
httpClient.close();
} catch (IOException e) {
e.printStackTrace();
}
}
3. OkHttp
OkHttpClient client = new OkHttpClient();
Request request = new Request.Builder()
.url("http://api.example.com/data")
.build();
try (Response response = client.newCall(request).execute()) {
if (response.isSuccessful()) {
System.out.println(response.body().string());
} else {
System.out.println("Request failed with response code: " + response.code());
}
} catch (IOException e) {
e.printStackTrace();
}
