原理
android客戶端模擬一個http的post請求到服務器端，服務器端接收相應的post請求后，返回響應信息給給客戶端。
背景
網上很多上傳到java服務器上的，找了好久，找到了上傳到php的了，思路跟我當初想的差不多，就是post過去。廢話不多說，直接上圖看代碼。
php代碼
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<?php$target_path = "./upload/";//接收文件目錄$target_path = $target_path . basename( $_files['uploadedfile']['name']);if(move_uploaded_file($_files['uploadedfile']['tmp_name'], $target_path)) {echo "the file ". basename( $_files['uploadedfile']['name']). " has been uploaded";} else{echo "there was an error uploading the file, please try again!" . $_files['uploadedfile']['error'];}?> |
android代碼
上傳的主要代碼:
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private void uploadfile(string uploadurl){string end = " ";string twohyphens = "--";string boundary = "******";try{url url = new url(uploadurl);httpurlconnection httpurlconnection = (httpurlconnection) url.openconnection();//http連接// 設置每次傳輸的流大小，可以有效防止手機因為內存不足崩潰// 此方法用于在預先不知道內容長度時啟用沒有進行內部緩沖的 http 請求正文的流。httpurlconnection.setchunkedstreamingmode(128 * 1024);// 128k// 允許輸入輸出流httpurlconnection.setdoinput(true);httpurlconnection.setdooutput(true);httpurlconnection.setusecaches(false);// 使用post方法httpurlconnection.setrequestmethod("post");httpurlconnection.setrequestproperty("connection", "keep-alive");//保持一直連接httpurlconnection.setrequestproperty("charset", "utf-8");//編碼httpurlconnection.setrequestproperty("content-type","multipart/form-data;boundary=" + boundary);//post傳遞過去的編碼dataoutputstream dos = new dataoutputstream(httpurlconnection.getoutputstream());//輸出流dos.writebytes(twohyphens + boundary + end);dos.writebytes("content-disposition: form-data; name="uploadedfile"; filename=""+ srcpath.substring(srcpath.lastindexof("/") + 1)+ """+ end);dos.writebytes(end);fileinputstream fis = new fileinputstream(srcpath);//文件輸入流，寫入到內存中byte[] buffer = new byte[8192]; // 8kint count = 0;// 讀取文件while ((count = fis.read(buffer)) != -1){dos.write(buffer, 0, count);}fis.close();dos.writebytes(end);dos.writebytes(twohyphens + boundary + twohyphens + end);dos.flush();inputstream is = httpurlconnection.getinputstream();//http輸入，即得到返回的結果inputstreamreader isr = new inputstreamreader(is, "utf-8");bufferedreader br = new bufferedreader(isr);string result = br.readline();toast.maketext(this, result, toast.length_long).show();//將結果輸出dos.close();is.close();} catch (exception e){e.printstacktrace();settitle(e.getmessage());}} |
因為安卓4.0之后耗時間的操作要求都在非ui線程中操作，即將前面的asynctask拿來用了吧~
asynctask傳送門：http://www.zmynmublwnt.cn/article/159411.html
在這個類中，將上傳的操作放在doinbackground當中，可以有progressdialog顯示上傳了多少：
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// read filebytesread = fileinputstream.read(buffer, 0, buffersize);while (bytesread > 0) {outputstream.write(buffer, 0, buffersize);length += buffersize;progress = (int) ((length * 100) / totalsize);publishprogress(progress);bytesavailable = fileinputstream.available();buffersize = math.min(bytesavailable, maxbuffersize);bytesread = fileinputstream.read(buffer, 0, buffersize);}outputstream.writebytes(lineend);outputstream.writebytes(twohyphens + boundary + twohyphens+ lineend);publishprogress(100); |
還有就是，注意權限喲：
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<uses-permission android:name="android.permission.internet" /> |
以上內容給大家介紹了android異步上傳圖片到php服務器，希望本文分享能夠給大家帶來幫助。
