从Java使用POST发送文件

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

public class FileUploader {
    public static void main(String[] args) {
        String fileUrl = "http://example.com/upload"; // 服务器接收文件的URL
        String filePath = "path/to/file.txt"; // 要上传的文件路径

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

            // 设置请求方法为POST
            connection.setRequestMethod("POST");
            connection.setDoOutput(true);

            // 设置请求头
            connection.setRequestProperty("Content-Type", "multipart/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW");

            // 创建文件输入流
            File file = new File(filePath);
            FileInputStream fileInputStream = new FileInputStream(file);

            // 获取输出流
            OutputStream outputStream = connection.getOutputStream();

            // 写入文件数据
            byte[] buffer = new byte[4096];
            int bytesRead;
            while ((bytesRead = fileInputStream.read(buffer)) != -1) {
                outputStream.write(buffer, 0, bytesRead);
            }

            // 关闭流
            fileInputStream.close();
            outputStream.flush();
            outputStream.close();

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

            // 处理响应结果
            BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
            String line;
            StringBuilder response = new StringBuilder();
            while ((line = reader.readLine()) != null) {
                response.append(line);
            }
            reader.close();

            System.out.println("Response: " + response.toString());
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}