Golang+Android實現檔案上傳（多檔案上傳、附帶請求參數），golangandroid

Golang+Android實現檔案上傳（多檔案上傳、附帶請求參數），golangandroid

本文是上一篇文章 Golang+Android（使用HttpURLConnection）實現檔案上傳 的升級版，實現多檔案上傳功能，並且附帶http請求參數。

用戶端代碼：

    /**     * 使用HttpURLConnection通過POST方式提交請求，並上傳檔案。     *     * @param actionUrl  訪問的url     * @param textParams 文本類型的POST參數(key:value)     * @param filePaths  檔案路徑的集合     * @return 伺服器返回的資料，出現異常時返回 null     */    public static String postWithFiles(String actionUrl, Map<String, String> textParams, List<String> filePaths) {        try {            final String BOUNDARY = UUID.randomUUID().toString();            final String PREFIX = "--";            final String LINE_END = "\r\n";            final String MULTIPART_FROM_DATA = "multipart/form-data";            final String CHARSET = "UTF-8";            URL uri = new URL(actionUrl);            HttpURLConnection conn = (HttpURLConnection) uri.openConnection();            //緩衝大小            conn.setChunkedStreamingMode(1024 * 64);            //逾時            conn.setReadTimeout(5 * 1000);            conn.setDoInput(true);            conn.setDoOutput(true);            conn.setUseCaches(false);             conn.setRequestMethod("POST");            conn.setRequestProperty("connection", "keep-alive");            conn.setRequestProperty("Charset", "UTF-8");            conn.setRequestProperty("Content-Type", MULTIPART_FROM_DATA + ";boundary=" + BOUNDARY);            // 拼接文本類型的參數            StringBuilder textSb = new StringBuilder();            if (textParams != null) {                for (Map.Entry<String, String> entry : textParams.entrySet()) {                    textSb.append(PREFIX).append(BOUNDARY).append(LINE_END);                    textSb.append("Content-Disposition: form-data; name=\"" + entry.getKey() + "\"" + LINE_END);                    textSb.append("Content-Type: text/plain; charset=" + CHARSET + LINE_END);                    textSb.append("Content-Transfer-Encoding: 8bit" + LINE_END);                    textSb.append(LINE_END);                    textSb.append(entry.getValue());                    textSb.append(LINE_END);                }            }            DataOutputStream outStream = new DataOutputStream(conn.getOutputStream());            outStream.write(textSb.toString().getBytes());            //參數POST方式            //outStream.write("userId=1&cityId=26".getBytes());            // 傳送檔案資料            if (filePaths != null) {                for (String file : filePaths) {                    StringBuilder fileSb = new StringBuilder();                    fileSb.append(PREFIX).append(BOUNDARY).append(LINE_END);                    fileSb.append("Content-Disposition: form-data; name=\"file\"; filename=\"" +                            file.substring(file.lastIndexOf("/") + 1) + "\"" + LINE_END);                    fileSb.append("Content-Type: application/octet-stream; charset=" + CHARSET + LINE_END);                    fileSb.append(LINE_END);                    outStream.write(fileSb.toString().getBytes());                    InputStream is = new FileInputStream(file);                    byte[] buffer = new byte[1024 * 8];                    int len;                    while ((len = is.read(buffer)) != -1) {                        outStream.write(buffer, 0, len);                    }                    is.close();                    outStream.write(LINE_END.getBytes());                }            }            // 請求結束標誌            outStream.write((PREFIX + BOUNDARY + PREFIX + LINE_END).getBytes());            outStream.flush();            // 得到響應碼            int responseCode = conn.getResponseCode();            BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream(), CHARSET));            StringBuilder resultSb = null;            String line;            if (responseCode == 200) {                resultSb = new StringBuilder();                while ((line = br.readLine()) != null) {                    resultSb.append(line).append("\n");                }            }            br.close();            outStream.close();            conn.disconnect();            return resultSb == null ? null : resultSb.toString();        } catch (IOException e) {            e.printStackTrace();        }        return null;    }

伺服器端代碼：

//用戶端上傳多個檔案,並帶有請求參數func handleUploadFile(w http.ResponseWriter, r *http.Request) {fmt.Println("client:", r.RemoteAddr, "method:", r.Method)r.ParseForm()r.ParseMultipartForm(32 << 20) //最大記憶體為32M//讀取參數userId := r.FormValue("userId")cityId := r.FormValue("cityId")log.Println("userId=", userId, "cityId=", cityId)mp := r.MultipartFormif mp == nil {log.Println("not MultipartForm.")w.Write(([]byte)("不是MultipartForm格式"))return}fileHeaders, findFile := mp.File["file"]if !findFile || len(fileHeaders) == 0 {log.Println("file count == 0.")w.Write(([]byte)("沒有上傳檔案"))return}for _, v := range fileHeaders {fileName := v.Filenamefile, err := v.Open()checkErrorV2(err, "Open file error."+fileName)defer file.Close()outputFilePath := "/home/admin/案頭/" + fileNamewriter, err := os.OpenFile(outputFilePath, os.O_WRONLY|os.O_CREATE, 0666)checkErrorV2(err, "Open local file error")io.Copy(writer, file)}msg := fmt.Sprintf("成功上傳了%d個檔案", len(fileHeaders))w.Write(([]byte)(msg))}

註：checkErrorV2是一個簡單的檢查錯誤的函數。