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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
执行效果图：
我曾在《Android网络编程之使用HttpClient批量上传文件》一文中介绍过怎样通过HttpClient实现多文件上传和server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。例如以下所看到的：
/**
* 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。重写当中的关键方法，实现进度监听的功能。例如以下所看到的。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。代码例如以下：
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进行上传并显示运行进度的功能，很easy，代码例如以下，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>{
/**server路径**/
private String url;
/**上传的參数**/
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;
} @Override
protected void onPreExecute() {//运行前的初始化
// TODO Auto-generated method stub
progressDialog=new ProgressDialog(context);
progressDialog.setTitle("请稍等...");
progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
progressDialog.setCancelable(true);
progressDialog.show();
super.onPreExecute();
} @Override
protected String doInBackground(String... params) {//运行任务
// TODO Auto-generated method stub
MultipartEntityBuilder 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"));//设置请求參数
builder.addTextBody("fileTypes", paramMap.get("fileTypes"));//设置请求參数
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);
} @Override
protected void onProgressUpdate(Integer... values) {//运行进度
// TODO Auto-generated method stub
Log.i("info", "values:"+values[0]);
progressDialog.setProgress((int)values[0]);//更新进度条
super.onProgressUpdate(values);
} @Override
protected void onPostExecute(String result) {//运行结果
// TODO Auto-generated method stub
Log.i("info", result);
Toast.makeText(context, result, Toast.LENGTH_LONG).show();
progressDialog.dismiss();
super.onPostExecute(result);
}
/**
* 向server上传文件
* @param url
* @param entity
* @return
*/
public String uploadFile(String url, ProgressOutHttpEntity entity) {
HttpClient httpClient=new DefaultHttpClient();// 开启一个client 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server端怎样接收：能够參考：《Android网络编程之使用HttpClient批量上传文件》，我在里面已经介绍的非常清楚了。
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