Java 调用第三方接口（get/post）

在Java中调用第三方API接口通常使用HttpClient库。以下是使用HttpClient进行GET和POST请求的示例代码：

import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
 
public class HttpClientExample {
 
    public static void main(String[] args) {
        // 创建HttpClient实例
        CloseableHttpClient httpClient = HttpClients.createDefault();
 
        try {
            // GET请求
            HttpGet httpGet = new HttpGet("http://api.example.com/data");
            HttpResponse getResponse = httpClient.execute(httpGet);
            System.out.println("GET Response Status:: " + getResponse.getStatusLine().getStatusCode());
            String getResponseBody = EntityUtils.toString(getResponse.getEntity());
            System.out.println(getResponseBody);
 
            // POST请求
            HttpPost httpPost = new HttpPost("http://api.example.com/data");
            String json = "{\"key\":\"value\"}";
            StringEntity entity = new StringEntity(json);
            httpPost.setEntity(entity);
            httpPost.setHeader("Content-type", "application/json");
            HttpResponse postResponse = httpClient.execute(httpPost);
            System.out.println("POST Response Status:: " + postResponse.getStatusLine().getStatusCode());
            String postResponseBody = EntityUtils.toString(postResponse.getEntity());
            System.out.println(postResponseBody);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                httpClient.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

确保在项目中包含了Apache HttpClient依赖：

<!-- https://mvnrepository.com/artifact/org.apache.httpcomponents/httpclient -->
<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpclient</artifactId>
    <version>4.5.13</version>
</dependency>

以上代码展示了如何使用HttpClient执行GET和POST请求。在实际应用中，你可能需要处理响应、添加请求头、处理异常等。