java 上传人家到指定服务器

要将文件上传到指定的服务器，您可以使用Java中的URLConnection或Apache HttpClient来实现。下面是使用URLConnection实现文件上传的示例代码：

import java.io.*;
import java.net.*;

public class FileUploader {
    public static void main(String[] args) {
        String filePath = "path/to/your/file";
        String serverUrl = "http://example.com/upload";
        File file = new File(filePath);
        try {
            URL url = new URL(serverUrl);
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setRequestMethod("POST");
            connection.setDoOutput(true);
            connection.setUseCaches(false);
            connection.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + "*****");
            DataOutputStream outputStream = new DataOutputStream(connection.getOutputStream());
            outputStream.writeBytes("--" + "*****" + "\r\n");
            outputStream.writeBytes("Content-Disposition: form-data; name=\"file\"; filename=\"" + file.getName() + "\"" + "\r\n");
            outputStream.writeBytes("\r\n");
            FileInputStream fileInputStream = new FileInputStream(file);
            byte[] buffer = new byte[1024];
            int bytesRead;
            while ((bytesRead = fileInputStream.read(buffer)) != -1) {
                outputStream.write(buffer, 0, bytesRead);
            }
            outputStream.writeBytes("\r\n");
            outputStream.writeBytes("--" + "*****" + "--" + "\r\n");
            fileInputStream.close();
            outputStream.flush();
            outputStream.close();
            int responseCode = connection.getResponseCode();
            if (responseCode == HttpURLConnection.HTTP_OK) {
                // 文件上传成功
            } else {
                // 文件上传失败
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

您需要将filePath和serverUrl替换为实际的文件路径和服务器URL。这段代码会将指定的文件上传到指定的服务器，并返回HTTP响应码来指示上传成功或失败。