android使用HttpURLConnection上传文件同时提交参数

在使用HttpURLConnection作为请求方式，有时候会有这样的需求。给一个接口上传文件，并且同时要提交其他的参数。但你可能会遇到这样的问题，就是无法同时上传文件的时候又提交其他类型的参数。怎么解决这个问题呢？

注释比较清晰，直接看代码吧：

private static HttpURLConnection uRLConnection;private static final String CHARSET = "UTF-8";/**     * 文件上传     *     * @author：gj     * @date: 2017/6/8     * @time: 11:25     * urlAddress  路径     * file 要上传的文件、     * fileKey 服务器端接收文件的字段     * param 需要同时提交的参数     * newFileName 给上传的文件重新命名，null则用文件原名     **/    public static String uploadFile(String urlAddress, File file,                                    String fileKey, Map<String, String> param, String newFileName) {        Log.i(TAG, "文件上传");        String BOUNDARY = UUID.randomUUID().toString(); // 边界标识 随机生成        String PREFIX = "--", LINE_END = "\r\n";        String CONTENT_TYPE = "multipart/form-data"; // 内容类型        String response = "";//服务器端返回值        try {            URL url = new URL(urlAddress);            uRLConnection = (HttpURLConnection) url.openConnection();//打开连接            uRLConnection.setDoInput(true);//以后就可以使用conn.getOutputStream().read()            uRLConnection.setDoOutput(true);//设置以后就可以使用conn.getOutputStream().write()            uRLConnection.setRequestMethod("POST");//使用post提交            uRLConnection.setUseCaches(false);//不使用缓存            uRLConnection.setInstanceFollowRedirects(false);//不自动重定向            uRLConnection.setRequestProperty("Content-Type", CONTENT_TYPE                    + ";boundary=" + BOUNDARY);//设置请求头            uRLConnection.setRequestProperty("connection", "keep-alive");//保持连接            uRLConnection.setRequestProperty("Charset", CHARSET);            uRLConnection.setConnectTimeout(10000);//请求超时时间            //开始请求连接            uRLConnection.connect();            //获取输出流            DataOutputStream out = new DataOutputStream(                    uRLConnection.getOutputStream());            /***             * 以下先是用于上传参数             */            if (param != null && param.size() > 0) {                Iterator<String> it = param.keySet().iterator();                while (it.hasNext()) {                    StringBuffer sb = new StringBuffer();                    String key = it.next();                    String value = param.get(key);                    sb.append(PREFIX).append(BOUNDARY).append(LINE_END);                    sb.append("Content-Disposition: form-data; name=\"")                            .append(key).append("\"").append(LINE_END)                            .append(LINE_END);                    sb.append(value).append(LINE_END);                    String params = sb.toString();                    Log.i(TAG, key + "=" + params + "##");                    out.write(params.getBytes());                    // dos.flush();                }            }            //参数上传完开始上传文件            if (file != null) {                StringBuffer sb = new StringBuffer();                sb.append(PREFIX);                sb.append(BOUNDARY);                sb.append(LINE_END);                /**                 * 这里重点注意： name里面的值为服务器端需要key 只有这个key 才可以得到对应的文件                 * filename是文件的名字，包含后缀名                 */                if (null != newFileName && "" != newFileName) {                    sb.append("Content-Disposition: form-data; name=\"" + fileKey                            + "\"; filename=\"" + newFileName + "\"" + LINE_END);                } else {                    sb.append("Content-Disposition: form-data; name=\"" + fileKey                            + "\"; filename=\"" + file.getName() + "\"" + LINE_END);                }                sb.append("Content-Type: application/octet-stream; charset="                        + CHARSET + LINE_END);                sb.append(LINE_END);                out.write(sb.toString().getBytes());                InputStream isinput = new FileInputStream(file);                byte[] bytes = new byte[1024];                int len = 0;                while ((len = isinput.read(bytes)) != -1) {                    out.write(bytes, 0, len);                }                out.write(LINE_END.getBytes());                byte[] end_data = (PREFIX + BOUNDARY + PREFIX + LINE_END)                        .getBytes();                out.write(end_data);                isinput.close();                out.flush();            }            int i = uRLConnection.getResponseCode();            Log.i("i", i + "");            if (i == 200) {                InputStream is = uRLConnection.getInputStream();                BufferedReader br = new BufferedReader(new InputStreamReader(is));                String readLine = null;                while ((readLine = br.readLine()) != null) {                    // response = br.readLine();                    response = readLine;                }                is.close();                br.close();            } else {                response = uRLConnection.getResponseCode() + "";            }            //关闭连接            uRLConnection.disconnect();        } catch (Exception e) {            return e.getMessage();        }        Log.i(TAG, "到服务器拿response" + response);        return response;    }