Java 微信企业号上传文件 java 代码

好的，以下是 Java 微信企业号上传文件的示例代码：

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

public class WechatMediaUpload {

    /**
     * 上传文件到微信服务器
     *
     * @param accessToken 微信企业号的 access_token
     * @param fileType    文件类型，可选值为image、voice、video、file
     * @param file        要上传的文件
     * @throws Exception
     */
    public static String uploadFile(String accessToken, String fileType, File file) throws Exception {
        String url = "https://qyapi.weixin.qq.com/cgi-bin/media/upload?type=" + fileType + "&access_token=" + accessToken;
        URL urlObj = new URL(url);
        HttpURLConnection conn = (HttpURLConnection) urlObj.openConnection();

        conn.setRequestMethod("POST");
        conn.setDoInput(true);
        conn.setDoOutput(true);
        conn.setUseCaches(false);

        String boundary = "-----------------------------" + System.currentTimeMillis();
        conn.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary);

        OutputStream out = new DataOutputStream(conn.getOutputStream());

        // 文件部分
        StringBuilder sb = new StringBuilder();
        sb.append("--").append(boundary).append("\r\n");
        sb.append("Content-Disposition: form-data; name=\"media\"; filename=\"" + file.getName() + "\"\r\n");
        sb.append("Content-Type: application/octet-stream\r\n\r\n");
        out.write(sb.toString().getBytes());

        DataInputStream in = new DataInputStream(new FileInputStream(file));
        int bytes = 0;
        byte[] bufferOut = new byte[1024];
        while ((bytes = in.read(bufferOut)) != -1) {
            out.write(bufferOut, 0, bytes);
        }
        in.close();

        out.write(("\r\n--" + boundary + "--\r\n").getBytes());
        out.flush();
        out.close();

        // 读取返回数据
        StringBuffer buffer = new StringBuffer();
        BufferedReader reader = null;
        try {
            reader = new BufferedReader(new InputStreamReader(conn.getInputStream(), "UTF-8"));
            String line = null;
            while ((line = reader.readLine()) != null) {
                buffer.append(line);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (reader != null) {
                reader.close();
            }
        }

        conn.disconnect();

        return buffer.toString();
    }

    public static void main(String[] args) {
        try {
            String accessToken = "your_access_token";
            String fileType = "image"; // 上传文件类型，可选值为image、voice、video、file
            File file = new File("your_file_path");

            String result = uploadFile(accessToken, fileType, file);
            System.out.println(result);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

注意替换代码中的 access_token 和文件路径，以及设置正确的文件类型。文件类型为企业号 API 中定义的四种类型之一：image、voice、video 和 file。