Golang+Android（使用HttpURLConnection）實現文件上傳

本文要演示的是使用Android程序作為客戶端（使用HttpURLConnection訪問網絡），Golang程序作為服務器端，實現文件上傳。

客戶端代碼：

public static String uploadFile(String uploadUrl, String filePath) {
        Log.v(TAG, "url:" + uploadUrl);
        Log.v(TAG, "filePath:" + filePath);

        String nextLine = "\r\n";
        String dividerStart = "--";
        String boundary = "******";
        try {
            URL url = new URL(uploadUrl);
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setChunkedStreamingMode(1024 * 256);
            connection.setDoInput(true);
            connection.setDoOutput(true);
            connection.setUseCaches(false);
            connection.setRequestMethod("POST");
            // 設置Http請求頭
            connection.setRequestProperty("Connection", "Keep-Alive");
            connection.setRequestProperty("Charset", "UTF-8");
            //必須在Content-Type 請求頭中指定分界符
            connection.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);

            //定義數據寫入流，准備上傳文件
            DataOutputStream dos = new DataOutputStream(connection.getOutputStream());
            dos.writeBytes(dividerStart + boundary + nextLine);
            //設置與上傳文件相關的信息
            dos.writeBytes("Content-Disposition: form-data; name=\"file\"; filename=\""
                    + filePath.substring(filePath.lastIndexOf("/") + 1) + "\"" + nextLine);
            dos.writeBytes(nextLine);

            FileInputStream fis = new FileInputStream(filePath);
            byte[] buffer = new byte[1024 * 32];
            int count;
            // 讀取文件內容，並寫入OutputStream對象
            while ((count = fis.read(buffer)) != -1) {
                dos.write(buffer, 0, count);
            }
            fis.close();
            dos.writeBytes(nextLine);
            dos.writeBytes(dividerStart + boundary + dividerStart + nextLine);
            dos.flush();

            // 開始讀取從服務器傳過來的信息
            InputStream is = connection.getInputStream();
            BufferedReader br = new BufferedReader(new InputStreamReader(is, "UTF-8"));
            String result = br.readLine();

            dos.close();
            is.close();
            connection.disconnect();

            return result;
        } catch (IOException e) {
            e.printStackTrace();
        }

        return null;
    }

package webserver

//接收客戶端通過http上傳的文件
//Date: 2015-3-25 16:18:33

import (
	"fmt"
	"io/ioutil"
	"log"
	"net/http"
	"os"
)

func UpLoadBase() {
	fmt.Println("This is uploadbase")
	http.HandleFunc("/httpUploadFile", handleUploadFile)
	http.ListenAndServe(":8086", nil)

	if err != nil {
		fmt.Println("ListenAndServe error: ", err.Error())
	}
}

func handleUploadFile(w http.ResponseWriter, r *http.Request) {
	fmt.Println("client:", r.RemoteAddr)

	file, fileHeader, err := r.FormFile("file")
	if err != nil {
		log.Fatal("FormFile:", err.Error())
		return
	}
	defer func() {
		if err := file.Close(); err != nil {
			log.Fatal("Close:", err.Error())
			return
		}
	}()

      
	//文件名
	fileName := fileHeader.Filename
	if fileName == "" {
		log.Fatal("Param filename cannot be null.")
		return
	}
	//文件內容
	bytes, err := ioutil.ReadAll(file)

	//寫到服務端本地文件中
	outputFilePath := "/home/admin/桌面/" + fileName
	err = ioutil.WriteFile(outputFilePath, bytes, os.ModePerm)
	if err != nil {
		log.Fatal("WriteFileError:", err.Error())
		return
	}

	w.Write(([]byte)("上傳文件成功！"))
}