Android使用HttpClient实现文件上传到PHP服务器，并监控进度条
上传
服务器端PHP
代码如下 ：
<?php $target_path = "./tmp/";//接收文件目录 $target_path = $target_path.($_FILES['file']['name']); $target_path = iconv("UTF-8","gb2312", $target_path); if(move_uploaded_file($_FILES['file']['tmp_name'], $target_path)) { echo "The file ".( $_FILES['file']['name'])." has been uploaded."; }else{ echo "There was an error uploading the file, please try again! Error Code: ".$_FILES['file']['error']; } ?>
监控进度实现
首先定义监听器接口，如下所示：
//进度监听器接口
public interface ProgressListener { public void transferred(long transferedBytes); }
实现监控进度的关键部分就在于记录已传输字节数，所以我们需重载FilterOutputStream，重写其中的关键方法，实现进度监听的功能，如下所示，本例中首先重载的是HttpEntityWrapper，顾名思义，就是将需发送的HttpEntity打包，以便计算总字节数，代码如下：
// ProgressOutHttpEntity：输出流(OutputStream)时记录已发送字节数
public class ProgressOutHttpEntity extends HttpEntityWrapper { private final ProgressListener listener; public ProgressOutHttpEntity(final HttpEntity entity, final ProgressListener listener) { super(entity); this.listener = listener; } public static class CountingOutputStream extends FilterOutputStream { private final ProgressListener listener; private long transferred; CountingOutputStream(final OutputStream out, final ProgressListener listener) { super(out); this.listener = listener; this.transferred = 0; } @Override public void write(final byte[] b, final int off, final int len) throws IOException { // NO, double-counting, as super.write(byte[], int, int) // delegates to write(int). // super.write(b, off, len); out.write(b, off, len); this.transferred += len; this.listener.transferred(this.transferred); } @Override public void write(final int b) throws IOException { out.write(b); this.transferred++; this.listener.transferred(this.transferred); } } @Override public void writeTo(final OutputStream out) throws IOException { this.wrappedEntity.writeTo(out instanceof CountingOutputStream ? out : new CountingOutputStream(out, this.listener)); } }
最后就是使用上述实现的类和Httpclient进行上传并显示进度的功能，非常简单，代码如下，使用AsyncTask异步上传。
public class FileUploadAsyncTask extends AsyncTask<File, Integer, String> { private String url = "http://192.168.83.213/receive_file.php"; private Context context; private ProgressDialog pd; private long totalSize; public FileUploadAsyncTask(Context context) { this.context = context; } @Override protected void onPreExecute() { pd = new ProgressDialog(context); pd.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); pd.setMessage("上传中...."); pd.setCancelable(false); pd.show(); } @Override protected String doInBackground(File... params) { // 保存需上传文件信息 MultipartEntityBuilder entitys = MultipartEntityBuilder.create(); entitys.setMode(HttpMultipartMode.BROWSER_COMPATIBLE); entitys.setCharset(Charset.forName(HTTP.UTF_8)); File file = params[0]; entitys.addPart("file", new FileBody(file)); HttpEntity httpEntity = entitys.build(); totalSize = httpEntity.getContentLength(); ProgressOutHttpEntity progressHttpEntity = new ProgressOutHttpEntity( httpEntity, new ProgressListener() { @Override public void transferred(long transferedBytes) { publishProgress((int) (100 * transferedBytes / totalSize)); } }); return uploadFile(url, progressHttpEntity); } @Override protected void onProgressUpdate(Integer... progress) { pd.setProgress((int) (progress[0])); } @Override protected void onPostExecute(String result) { pd.dismiss(); Toast.makeText(context, result, Toast.