android使用HttpURLConnection上传文件同时提交参数

Love The Way You Lie 2022-06-14 02:58 365阅读 0赞

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;
        }