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Android网络编程之使用HttpClient批量上传文件（二）AsyncTask+HttpClient并实现上传进度监听

 运行效果图：

        我曾在《Android网络编程之使用HttpClient批量上传文件》一文中介绍过如何通过HttpClient实现多文件上传和服务器的接收。在上一篇主要使用Handler+HttpClient的方式实现文件上传。这一篇将介绍使用AsyncTask+HttpClient实现文件上传并监听上传进度。

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(longtransferedBytes);}

        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：

package com.jph.ufh.utils;import java.io.FilterOutputStream;import java.io.IOException;import java.io.OutputStream;import org.apache.http.HttpEntity;import org.apache.http.entity.HttpEntityWrapper;/** * ProgressOutHttpEntity：输出流(OutputStream)时记录已发送字节数 * @author JPH * Date:2014.11.03 */public class ProgressOutHttpEntity extends HttpEntityWrapper {/**进度监听对象**/    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 {            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));    }    /**     * 进度监听器接口     */    public interface ProgressListener {        public void transferred(long transferedBytes);    }}

 

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。

/** * 异步AsyncTask+HttpClient上传文件,支持多文件上传,并显示上传进度 * @author JPH * Date:2014.10.09 * last modified 2014.11.03 */public class UploadUtilsAsync extends AsyncTask<String, Integer, String>{/**服务器路径**/private String url;/**上传的参数**/private Map<String,String>paramMap;/**要上传的文件**/private ArrayList<File>files;private long totalSize;private Context context;private ProgressDialog progressDialog;public UploadUtilsAsync(Context context,String url,Map<String, String>paramMap,ArrayList<File>files) {this.context=context;this.url=url;this.paramMap=paramMap;this.files=files;}@Overrideprotected void onPreExecute() {//执行前的初始化// TODO Auto-generated method stubprogressDialog=new ProgressDialog(context);progressDialog.setTitle("请稍等...");progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);progressDialog.setCancelable(true);progressDialog.show();super.onPreExecute();}@Overrideprotected String doInBackground(String... params) {//执行任务// TODO Auto-generated method stubMultipartEntityBuilder builder = MultipartEntityBuilder.create();builder.setCharset(Charset.forName(HTTP.UTF_8));//设置请求的编码格式builder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);//设置浏览器兼容模式int count=0;for (File file:files) {//FileBody fileBody = new FileBody(file);//把文件转换成流对象FileBody//builder.addPart("file"+count, fileBody);builder.addBinaryBody("file"+count, file);count++;}builder.addTextBody("method", paramMap.get("method"));//设置请求参数builder.addTextBody("fileTypes", paramMap.get("fileTypes"));//设置请求参数HttpEntity entity = builder.build();// 生成 HTTP POST 实体  totalSize = entity.getContentLength();//获取上传文件的大小        ProgressOutHttpEntity progressHttpEntity = new ProgressOutHttpEntity(        entity, new ProgressListener() {                    @Override                    public void transferred(long transferedBytes) {                        publishProgress((int) (100 * transferedBytes / totalSize));//更新进度                    }                });        return uploadFile(url, progressHttpEntity);}@Overrideprotected void onProgressUpdate(Integer... values) {//执行进度// TODO Auto-generated method stubLog.i("info", "values:"+values[0]);progressDialog.setProgress((int)values[0]);//更新进度条super.onProgressUpdate(values);}@Overrideprotected void onPostExecute(String result) {//执行结果// TODO Auto-generated method stubLog.i("info", result);Toast.makeText(context, result, Toast.LENGTH_LONG).show();progressDialog.dismiss();super.onPostExecute(result);}/** * 向服务器上传文件 * @param url * @param entity * @return */public String uploadFile(String url, ProgressOutHttpEntity entity) {HttpClient httpClient=new DefaultHttpClient();// 开启一个客户端 HTTP 请求         httpClient.getParams().setParameter(CoreProtocolPNames.PROTOCOL_VERSION, HttpVersion.HTTP_1_1);        httpClient.getParams().setParameter(CoreConnectionPNames.CONNECTION_TIMEOUT, 5000);// 设置连接超时时间        HttpPost httpPost = new HttpPost(url);//创建 HTTP POST 请求          httpPost.setEntity(entity);        try {            HttpResponse httpResponse = httpClient.execute(httpPost);            if (httpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {                return "文件上传成功";            }        } catch (ClientProtocolException e) {            e.printStackTrace();        } catch (ConnectTimeoutException e) {            e.printStackTrace();        } catch (Exception e) {            e.printStackTrace();        } finally {            if (httpClient != null && httpClient.getConnectionManager() != null) {                httpClient.getConnectionManager().shutdown();            }        }        return "文件上传失败";    }}

        关于服务器端如何接收：可以参考：《Android网络编程之使用HttpClient批量上传文件》，我在里面已经介绍的很清楚了。

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