java如何调用外部接口_仓库管理系统java源代码

java如何调用外部接口_仓库管理系统java源代码在 Java 中调用第三方接口通常有以下几种方法 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中调用第三方接口通常有以下几种方法:

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(); BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream())); String inputLine; StringBuffer response = new StringBuffer(); while ((inputLine = in.readLine()) != null) { response.append(inputLine); } in.close(); System.out.println(response.toString()); } catch (Exception e) { e.printStackTrace(); } } } 

2. 使用Apache HttpClient库:

首先,在项目的`pom.xml`文件中添加Apache HttpClient的依赖:

  
  
    
    
  
    
  
    org.apache.httpcomponents 
   httpclient  
  
    
  
    4.5.13 
    

然后,创建一个方法来调用第三方接口:

 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. 如果第三方接口提供了Java客户端库,可以直接使用该库调用接口,例如:

 import com.example.ExternalInterface; import com.example.ExternalInterfaceImpl; public class ExternalInterfaceDemo { public static void main(String[] args) { ExternalInterface externalInterface = new ExternalInterfaceImpl(); externalInterface.method(); } } class ExternalInterfaceImpl implements ExternalInterface { @Override public void method() { System.out.println("调用外部接口的方法"); } } 

请根据具体情况选择合适的方法,并注意处理可能出现的异常

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