写一个java用post请求上传请求中传的多个照片或视频或者音频的文件流至本机D盘tmp文件夹下

好的，以下是Java代码示例：

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

public class UploadFileDemo {

    public static void main(String[] args) throws IOException {
        String url = "http://localhost:8080/upload"; // 上传文件的接口地址
        String filePath1 = "C:\\test\\image1.jpg"; // 第一个文件路径
        String filePath2 = "C:\\test\\video.mp4"; // 第二个文件路径
        String filePath3 = "C:\\test\\audio.wav"; // 第三个文件路径

        URL urlObj = new URL(url);
        HttpURLConnection con = (HttpURLConnection) urlObj.openConnection();
        con.setRequestMethod("POST");
        con.setDoOutput(true);
        con.setRequestProperty("Content-Type", "multipart/form-data; boundary=---Boundary");
        OutputStream out = con.getOutputStream();
        out.write(("\r\n---Boundary\r\n").getBytes());
        out.write(("Content-Disposition: form-data; name=\"file\"; filename=\"" + filePath1.substring(filePath1.lastIndexOf("\\") + 1) + "\"\r\n").getBytes());
        out.write(("Content-Type: image/jpeg\r\n\r\n").getBytes());
        FileInputStream fis = new FileInputStream(filePath1);
        byte[] buffer = new byte[1024];
        int len;
        while ((len = fis.read(buffer)) != -1) {
            out.write(buffer, 0, len);
        }
        fis.close();
        out.write(("\r\n---Boundary\r\n").getBytes());
        out.write(("Content-Disposition: form-data; name=\"file\"; filename=\"" + filePath2.substring(filePath2.lastIndexOf("\\") + 1) + "\"\r\n").getBytes());
        out.write(("Content-Type: video/mp4\r\n\r\n").getBytes());
        fis = new FileInputStream(filePath2);
        while ((len = fis.read(buffer)) != -1) {
            out.write(buffer, 0, len);
        }
        fis.close();
        out.write(("\r\n---Boundary\r\n").getBytes());
        out.write(("Content-Disposition: form-data; name=\"file\"; filename=\"" + filePath3.substring(filePath3.lastIndexOf("\\") + 1) + "\"\r\n").getBytes());
        out.write(("Content-Type: audio/wav\r\n\r\n").getBytes());
        fis = new FileInputStream(filePath3);
        while ((len = fis.read(buffer)) != -1) {
            out.write(buffer, 0, len);
        }
        fis.close();
        out.write(("\r\n---Boundary--\r\n").getBytes());
        out.flush();
        out.close();

        int responseCode = con.getResponseCode();
        System.out.println("Response Code: " + responseCode);
        BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
        String inputLine;
        StringBuffer response = new StringBuffer();
        while ((inputLine = in.readLine()) != null) {
            response.append(inputLine);
        }
        in.close();
        System.out.println("Response: " + response.toString());
    }
}

请替换以下内容：

- `url`：上传文件的接口地址。
- `filePath1`、`filePath2`、`filePath3`：三个文件的路径。

运行该程序，即可将三个文件上传至服务器。在服务器端，你可以根据自己的需求来接收并处理这些文件。