在Java中调用POST接口，可以使用Java内置的 HttpURLConnection 类或者 Apache HttpClient 类。下面分别介绍这两种方法：
使用 HttpURLConnection 类：import java.io.BufferedReader;import java.io.DataOutputStream;import java.io.InputStreamReader;import java.net.HttpURLConnection;import java.net.URL;public class HttpPostExample {public static void main(String[] args) {try {// 创建URL对象URL url = new URL("http://example.com/api/endpoint");// 创建HttpURLConnection对象HttpURLConnection connection = (HttpURLConnection) url.openConnection();// 设置请求方法为POSTconnection.setRequestMethod("POST");// 添加请求头connection.setRequestProperty("Content-Type", "application/json");// 启用输出流，并指定请求体的内容connection.setDoOutput(true);String requestBody = "{\"key1\":\"value1\", \"key2\":\"value2\"}";DataOutputStream outputStream = new DataOutputStream(connection.getOutputStream());outputStream.writeBytes(requestBody);outputStream.flush();outputStream.close();// 获取响应码int responseCode = connection.getResponseCode();// 读取响应内容BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));String line;StringBuilder response = new StringBuilder();while ((line = reader.readLine()) != null) {response.append(line);}reader.close();// 打印响应结果System.out.println("Response Code: " + responseCode);System.out.println("Response Body: " + response.toString());} catch (Exception e) {e.printStackTrace();}}}import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.client.HttpClient;import org.apache.http.client.methods.HttpPost;import org.apache.http.entity.StringEntity;import org.apache.http.impl.client.HttpClientBuilder;import org.apache.http.util.EntityUtils;public class HttpPostExample {public static void main(String[] args) {try {// 创建HttpClient对象HttpClient httpClient = HttpClientBuilder.create().build();// 创建HttpPost对象，并设置URLHttpPost httpPost = new HttpPost("http://example.com/api/endpoint");// 设置请求头httpPost.setHeader("Content-Type", "application/json");// 设置请求体的内容String requestBody = "{\"key1\":\"value1\", \"key2\":\"value2\"}";StringEntity requestEntity = new StringEntity(requestBody);httpPost.setEntity(requestEntity);// 发送POST请求HttpResponse response = httpClient.execute(httpPost);// 获取响应码int responseCode = response.getStatusLine().getStatusCode();// 读取响应内容HttpEntity responseEntity = response.getEntity();String responseBody = EntityUtils.toString(responseEntity);// 打印响应结果System.out.println("Response Code: " + responseCode);System.out.println("Response Body: " + responseBody);} catch (Exception e) {e.printStackTrace();}}}以上代码示例中，假设要调用的接口为 http://example.com/api/endpoint，请求体的内容为 {"key1":"value1", "key2":"value2"}，你需要根据实际情况进行修改。
