原理

Android客户端模拟一个HTTP的Post请求到服务器端，服务器端接收相应的Post请求后，返回响应信息给给客户端。

背景

网上很多上传到java服务器上的，找了好久，找到了上传到php的了，思路跟我当初想的差不多，就是POST过去。废话不多说，直接上图看代码。

php代码

<?php$target_path = "./upload/";//接收文件目录$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代码

上传的主要代码:

private void uploadFile(String uploadUrl){String end = "\r\n";String twoHyphens = "--";String boundary = "******";try{URL url = new URL(uploadUrl);HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();//http连接// 设置每次传输的流大小，可以有效防止手机因为内存不足崩溃// 此方法用于在预先不知道内容长度时启用没有进行内部缓冲的 HTTP 请求正文的流。httpURLConnection.setChunkedStreamingMode(128 * 1024);// 128K// 允许输入输出流httpURLConnection.setDoInput(true);httpURLConnection.setDoOutput(true);httpURLConnection.setUseCaches(false);// 使用POST方法httpURLConnection.setRequestMethod("POST");httpURLConnection.setRequestProperty("Connection", "Keep-Alive");//保持一直连接httpURLConnection.setRequestProperty("Charset", "UTF-8");//编码httpURLConnection.setRequestProperty("Content-Type","multipart/form-data;boundary=" + boundary);//POST传递过去的编码DataOutputStream dos = new DataOutputStream(httpURLConnection.getOutputStream());//输出流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);//文件输入流，写入到内存中byte[] buffer = new byte[8192]; // 8kint count = 0;// 读取文件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输入，即得到返回的结果InputStreamReader isr = new InputStreamReader(is, "utf-8");BufferedReader br = new BufferedReader(isr);String result = br.readLine();Toast.makeText(this, result, Toast.LENGTH_LONG).show();//将结果输出dos.close();is.close();} catch (Exception e){e.printStackTrace();setTitle(e.getMessage());}}

因为安卓4.0之后耗时间的操作要求都在非UI线程中操作，即将前面的AsyncTask拿来用了吧~

AsyncTask传送门：

在这个类中，将上传的操作放在doInBackground当中，可以有ProgressDialog显示上传了多少：

// 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);

还有就是，注意权限哟：

<uses-permission android:name="android.permission.INTERNET" />

以上内容给大家介绍了Android异步上传图片到PHP服务器，希望本文分享能够给大家带来帮助。