一个用java的get请求

java发送一个get请求，请求参数class=yanfa，使用Authorization认证，在Request Header里填充Authorization： Bearer {token}进行请求认证，token为：sadagdagdgdgfagfd ,另外在Header里补充App标识，X-Client-Tag：plmm，然后获取返回的json内容

方法1 （HttpURLConnection）

public static void classOwner(String class) {String url = "http://baidu.com/api/wenxinyiyanproject?class=" + class;String Token = "sadagdagdgdgfagfd";String clientTag = "plmm";try {URL obj = new URL(url);HttpURLConnection con = (HttpURLConnection) obj.openConnection();// 设置请求方法为GETcon.setRequestMethod("GET");// 添加Authorization头con.setRequestProperty("Authorization", "Bearer " + beToken);// 添加X-Client-Tag头con.setRequestProperty("X-Client-Tag", clientTag);int responseCode = con.getResponseCode();final String responseMessage = con.getResponseMessage();if (responseCode == HttpURLConnection.HTTP_OK) {BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));String inputLine;StringBuilder response = new StringBuilder();while ((inputLine = in.readLine()) != null) {response.append(inputLine);}in.close();System.out.println("response" + response.toString());} else {System.out.println("Error: " + responseCode);}} catch (Exception e) {System.out.println("发送GET请求出现异常：" + e.getMessage());}}

方法2（HttpClients）

public class HttpGetExample {public static void main(String[] args) throws IOException {String url = "http://baidu.com/api/wenxinyiyanproject?class=yanfa";// 创建HttpClient对象try (CloseableHttpClient httpClient = HttpClients.createDefault()) {// 创建HttpGet对象HttpGet httpGet = new HttpGet(url);// 添加Authorization认证httpGet.setHeader("Authorization", "Bearer sadagdagdgdgfagfd");// 添加X-Client-Tag标识httpGet.setHeader("X-Client-Tag", "plmm");// 发送GET请求HttpResponse response = httpClient.execute(httpGet);// 获取响应码int statusCode = response.getStatusLine().getStatusCode();System.out.println("Response Code: " + statusCode);// 获取响应内容try (InputStream inputStream = response.getEntity().getContent()) {String responseBody = new String(inputStream.readAllBytes());// 打印响应内容System.out.println(responseBody);}}}
}

方法3（RestTemplate）

public class HttpGetExample {public static void main(String[] args) {String url = "http://baidu.com/api/wenxinyiyanproject?class=yanfa";// 创建RestTemplate对象RestTemplate restTemplate = new RestTemplate();// 设置请求头HttpHeaders headers = new HttpHeaders();headers.set("Authorization", "Bearer sadagdagdgdgfagfd");headers.set("X-Client-Tag", "plmm");HttpEntity<String> entity = new HttpEntity<>(null, headers);try {// 发送GET请求，并接收响应ResponseEntity<String> response = restTemplate.exchange(url, HttpMethod.GET, entity, String.class);// 获取响应码int statusCode = response.getStatusCodeValue();System.out.println("Response Code: " + statusCode);// 获取响应内容String responseBody = response.getBody();// 打印响应内容System.out.println(responseBody);} catch (Exception e) {e.printStackTrace();}}
}