java input 上传文件至服务器

好的，对于java input上传文件至服务器，您可以使用以下代码：

import java.io.*;

import java.net.*;

public class FileUploader {

  public static void main(String[] args) {

    String fileUrl = "http://localhost:8080/upload"; // 上传接口地址
    String filePath = "C:\\test\\test.txt"; // 被上传的文件路径

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

      conn.setRequestMethod("POST");
      conn.setConnectTimeout(10000);
      conn.setReadTimeout(10000);
      conn.setDoOutput(true);
      conn.setDoInput(true);
      conn.setRequestProperty("Content-Type", "multipart/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW");

      File file = new File(filePath);
      OutputStream outputStream = conn.getOutputStream();
      DataOutputStream dataOutputStream = new DataOutputStream(new BufferedOutputStream(outputStream));

      // 开始上传文件
      dataOutputStream.writeBytes("------WebKitFormBoundary7MA4YWxkTrZu0gW\r\n");
      dataOutputStream.writeBytes("Content-Disposition: form-data; name=\"file\"; filename=\"" + file.getName() + "\"\r\n");
      dataOutputStream.writeBytes("Content-Type: application/octet-stream\r\n\r\n");

      FileInputStream fileInputStream = new FileInputStream(file);
      byte[] buffer = new byte[1024];
      int length;
      while ((length = fileInputStream.read(buffer)) != -1) {
        dataOutputStream.write(buffer, 0, length);
      }

      dataOutputStream.writeBytes("\r\n");
      dataOutputStream.writeBytes("------WebKitFormBoundary7MA4YWxkTrZu0gW--\r\n");

      fileInputStream.close();
      dataOutputStream.flush();
      dataOutputStream.close();

      // 获取响应码，如果成功返回200
      int responseCode = conn.getResponseCode();
      if (responseCode == HttpsURLConnection.HTTP_OK) {
        // 上传成功
        System.out.println("上传成功！");
      } else {
        // 上传失败
        System.out.println("上传失败！");
      }

      conn.disconnect();

    } catch (Exception e) {
      e.printStackTrace();
    }

  }
}

希望能对您有所帮助！