java调用接口代码_java下载文件到本地

java调用接口代码_java下载文件到本地在 Java 中调用第三方 HTTP 接口通常有以下几种方式 1 使用 Java 内置的 HttpURLConne 类 javaimport java io BufferedRead import java io InputStreamR import java net HttpURLConne import java net URL public class

在Java中调用第三方HTTP接口通常有以下几种方式:

1. 使用Java内置的`HttpURLConnection`类:

 import java.io.BufferedReader; import java.io.InputStreamReader; import java.net.HttpURLConnection; import java.net.URL; public class HttpClient { public static void main(String[] args) { try { URL url = new URL("http://example.com/api"); HttpURLConnection connection = (HttpURLConnection) url.openConnection(); connection.setRequestMethod("GET"); int statusCode = connection.getResponseCode(); if (statusCode == HttpURLConnection.HTTP_OK) { BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream())); String line; while ((line = reader.readLine()) != null) { System.out.println(line); } reader.close(); } } catch (Exception e) { e.printStackTrace(); } } } 

2. 使用第三方库,如Apache HttpClient:

 import org.apache.http.HttpResponse; import org.apache.http.client.HttpClient; import org.apache.http.client.methods.HttpGet; import org.apache.http.impl.client.HttpClients; import org.apache.http.util.EntityUtils; public class HttpClientExample { public static void main(String[] args) { HttpClient httpClient = HttpClients.createDefault(); HttpGet httpGet = new HttpGet("http://example.com/api"); try { HttpResponse response = httpClient.execute(httpGet); String result = EntityUtils.toString(response.getEntity()); System.out.println(result); } catch (Exception e) { e.printStackTrace(); } } } 

3. 使用Spring框架的`RestTemplate`:

 import org.springframework.web.client.RestTemplate; public class RestClientExample { public static void main(String[] args) { RestTemplate restTemplate = new RestTemplate(); String url = "http://example.com/api"; String result = restTemplate.getForObject(url, String.class); System.out.println(result); } } 

4. 使用Java 8及以上版本的流API和`HttpClient`:

 import java.net.URI; import java.net.http.HttpClient; import java.net.http.HttpRequest; import java.net.http.HttpResponse; public class Java11HttpClientExample { public static void main(String[] args) { HttpClient client = HttpClient.newHttpClient(); HttpRequest request = HttpRequest.newBuilder() .uri(URI.create("http://example.com/api")) .GET() .build(); try { HttpResponse 
  
    response = client.send(request, HttpResponse.BodyHandlers.ofString()); 
   System.out.println(response.body()); } catch (Exception e) { e.printStackTrace(); } } } 

以上示例展示了如何使用不同的方法调用HTTP接口。您可以根据项目需求选择合适的方法。

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