java怎么调用post接口

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：

1. 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POST connection.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(); } } } 

2. 使用 Apache HttpClient 类：

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URL HttpPost 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。