java post请求以form-data格式上传file文件并请求接口

import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;

public class FileUploadExample {
    public static void main(String[] args) {
        String urlString = "http://your-api-endpoint.com"; // 替换为你的API端点
        String filePath = "path/to/your/file.txt"; // 替换为你要上传的文件路径

        try {
            URL url = new URL(urlString);
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();

            // 设置请求方法和属性
            connection.setRequestMethod("POST");
            connection.setDoOutput(true);
            connection.setRequestProperty("Content-Type", "multipart/form-data");

            // 创建输出流并写入文件数据
            OutputStream outputStream = connection.getOutputStream();
            Files.copy(Paths.get(filePath), outputStream);
            outputStream.flush();

            // 获取响应码和响应内容
            int responseCode = connection.getResponseCode();
            System.out.println("Response Code: " + responseCode);

            // 处理响应内容（如果有）
            // ...

            // 关闭连接
            outputStream.close();
            connection.disconnect();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}