基于標準的http來實現Android多文件上傳

實現多文件的上傳，基于標準的http來實現。

1. 多文件上傳MyUploader類的實現：

/**



同步上傳多個文件
基于標準的http實現，需要在非UI線程中調用，以免阻塞UI。
/
public class MyUploader {
 private static final String TAG = "MyUploader";
// ////////////////////同步上傳多個文件/////////

 /**
  * 同步上傳File
  * 
  * @param Url
  * @param fullFileName
  *            : 全路徑，ex. /sdcard/f/yh.jpg
  * @param fileName
  *            : file name, ex. yh.jpg
  * @return 服務器的響應結果(字符串形式)
  */
 public String MyUploadMultiFileSync(String Url,
         List<String> fileList, Map<String, String> params) {
     String reulstCode = "";
     String end = "\r\n";
     String twoHyphens = "--";
     String boundary = "--------boundary";

     try {
         URL url = new URL(actionUrl);
         HttpURLConnection con = (HttpURLConnection) url.openConnection();
         // 允許Input、Output，不使用Cache
         con.setDoInput(true);
         con.setDoOutput(true);
         con.setUseCaches(false);
         // 設置傳送的method=POST
         con.setRequestMethod("POST");
         // setRequestProperty
         con.setRequestProperty("Connection", "Keep-Alive");
         con.setRequestProperty("Charset", "UTF-8");
         // con.setRequestProperty("Content-Type",
         // "application/x-www-form-urlencoded");
         con.setRequestProperty("Content-Type",
                 "multipart/form-data;boundary=" + boundary);

         StringBuffer s = new StringBuffer();
         // 設置DataOutputStream
         DataOutputStream dos = new DataOutputStream(con.getOutputStream());

         for (int i = 0; i < fileList.size(); i++) {

             String filePath = fileList.get(i);

             int endFileIndex = filePath.lastIndexOf("/");
             String fileName = filePath.substring(endFileIndex + 1);
             Log.i(TAG, "filename= " + fileName);
             // set 頭部
             StringBuilder sb = new StringBuilder();

             sb.append(twoHyphens);
             sb.append(boundary);
             sb.append(end);
             sb.append("Content-Disposition: form-data; ");
             sb.append("name=" + "\"" + "upload_file" +i + "\"");
             sb.append(";filename=");
             sb.append("\"" + fileName + "\"");
             sb.append(end);

             sb.append("Content-Type: ");
             sb.append("image/jpeg");
             sb.append(end);
             sb.append(end);

             // 1. write sb
             dos.writeBytes(sb.toString());

             // 取得文件的FileInputStream
             FileInputStream fis = new FileInputStream(filePath);
             // 設置每次寫入1024bytes
             int bufferSize = 1024;
             byte[] buffer = new byte[bufferSize];

             int length = -1;
             // 從文件讀取數據至緩沖區
             while ((length = fis.read(buffer)) != -1) {
                 dos.write(buffer, 0, length);
             }
             dos.writeBytes(end);
             fis.close();

             dos.writeBytes(end);
             dos.writeBytes(end);

             //dos.writeBytes(end);
             //dos.flush();
             // close streams
             //fis.close();
         }

         // set 尾部
         StringBuilder sb2 = new StringBuilder();

         if (params != null && !params.isEmpty()) {
             for (String key : params.keySet()) {
                 String value = params.get(key);
                 sb2.append(twoHyphens);
                 sb2.append(boundary);
                 sb2.append(end);
                 sb2.append("Content-Disposition: form-data; ");
                 sb2.append("name=" + "\"");
                 sb2.append(key + "\"");
                 sb2.append(end);
                 sb2.append(end);
                 sb2.append(value);
                 sb2.append(end);
             }
         }
         sb2.append(twoHyphens + boundary + end);
         dos.writeBytes(sb2.toString());
         dos.flush();
         Log.i(TAG, "sb2:" + sb2.toString());

         // 取得Response內容
         InputStream is = con.getInputStream();
         int ch;
         StringBuffer b = new StringBuffer();
         while ((ch = is.read()) != -1) {
             b.append((char) ch);
         }
         reulstCode = b.toString().trim();
         // 關閉
         dos.close();
     } catch (IOException e) {
         Log.i(TAG, "IOException: " + e);
         e.printStackTrace();
     }

     return reulstCode;
 }

}</pre> 

 
 2. 調用方法： 
 
 由于MyUploader的MyUploadMultiFileSync本身是同步的函數請求，所以，這個函數需要在非UI線程中執行。本例采用Thread+Handler的方式來進行說明。 
 下面是activity的主要代碼,功能是將cache目錄中的的jpg文件上傳到指定的服務器： 
 
public void uploadThreadTest() {


 new Thread(new Runnable() {
     @Override
     public void run() {

         try {
             upload();
         } catch (Exception e) {
             e.printStackTrace();
         }
     }

 }).start();


}
private void upload() {

 String url = "https://httpbin.org/post";
 List<String> fileList = getCacheFiles();

 if (fileList == null) {
     myHandler.sendEmptyMessage(-1);
 }else {
     MyUploader myUpload = new MyUploader();
     //同步請求，直接返回結果，根據結果來判斷是否成功。
     String reulstCode = myUpload.MyUploadMultiFileSync(url, fileList, null);
     Log.i(TAG, "upload reulstCode: " + reulstCode);
     myHandler.sendEmptyMessage(0);

 }

}
private List<String> getCacheFiles() {

 List<String> fileList = new ArrayList<String>();
 File catchPath = mContext.getCacheDir();

 if (catchPath!=null && catchPath.isDirectory()) {

     File[] files = catchPath.listFiles();
     if (files == null || files.length<1) {
         return null;
     }
     for (int i = 0; i < files.length; i++) {
         if (files[i].isFile() && files[i].getAbsolutePath().endsWith(".jpg")) {
             fileList.add(files[i].getAbsolutePath());
         }

     }
     return fileList;

 }
 return null;



}
////////////handler/////
private Handler myHandler = new Handler() {
    @Override
    public void handleMessage(Message msg) {
        Log.i(TAG,"handleMessage msg===" + msg);
        if (msg.what == -1) {
            Toast.makeText(mContext, "not find file!", Toast.LENGTH_LONG).show();
            return;
        }else {
            Toast.makeText(mContext, "upload success!", Toast.LENGTH_LONG).show();
        }

    }

};</pre> 



 3 項目demo代碼地址： 

 https://github.com/ranke/HttpAsyncTest