向服务器发送POST请求

向服务器发送POST请求可以使用不同的编程语言和框架来实现。以下是几种常见的示例代码：

1. 使用Python的requests库发送POST请求：

import requests

url = 'http://example.com/api/endpoint'
data = {'key1': 'value1', 'key2': 'value2'}

response = requests.post(url, data=data)
print(response.status_code)
print(response.json())

2. 使用JavaScript的fetch API发送POST请求：

const url = 'http://example.com/api/endpoint';
const data = { key1: 'value1', key2: 'value2' };

fetch(url, {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify(data),
})
  .then(response => response.json())
  .then(data => console.log(data))
  .catch(error => console.log(error));

3. 使用Java的HttpURLConnection发送POST请求：

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public class PostRequestExample {
    public static void main(String[] args) {
        try {
            String url = "http://example.com/api/endpoint";
            URL obj = new URL(url);
            HttpURLConnection con = (HttpURLConnection) obj.openConnection();

            // 设置请求方法为POST
            con.setRequestMethod("POST");

            // 设置请求头
            con.setRequestProperty("Content-Type", "application/json");

            // 设置请求体
            String data = "{\"key1\":\"value1\", \"key2\":\"value2\"}";
            con.setDoOutput(true);
            OutputStream os = con.getOutputStream();
            os.write(data.getBytes());
            os.flush();
            os.close();

            // 获取响应
            int responseCode = con.getResponseCode();
            BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
            String inputLine;
            StringBuffer response = new StringBuffer();

            while ((inputLine = in.readLine()) != null) {
                response.append(inputLine);
            }
            in.close();

            // 打印响应
            System.out.println("Response Code: " + responseCode);
            System.out.println("Response: " + response.toString());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

以上是三种常见的示例代码，具体选择哪种方法取决于你使用的编程语言和框架。在实际应用中，你需要根据自己的需求进行适当的修改和调整。