Android开发之httpclient文件上传实现

文件上传可能是一个比較耗时的操作，假设为上传操作带上进度提示则能够更好的提高用户体验，最后效果例如以下图：

项目源代码：http://download.csdn.net/detail/shinay/4965230

这里仅仅贴出代码，可依据实际情况自行改动。

[java] view
plain copy

package com.lxb.uploadwithprogress.http;
import java.io.File;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.mime.content.FileBody;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.protocol.BasicHttpContext;
import org.apache.http.protocol.HttpContext;
import org.apache.http.util.EntityUtils;
import android.app.ProgressDialog;
import android.content.Context;
import android.os.AsyncTask;
import com.lxb.uploadwithprogress.http.CustomMultipartEntity.ProgressListener;
public class HttpMultipartPost extends AsyncTask<String, Integer, String> {
private Context context;
private String filePath;
private ProgressDialog pd;
private long totalSize;
public HttpMultipartPost(Context context, String filePath) {
this.context = context;
this.filePath = filePath;
}
@Override
protected void onPreExecute() {
pd = new ProgressDialog(context);
pd.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
pd.setMessage("Uploading Picture...");
pd.setCancelable(false);
pd.show();
}
@Override
protected String doInBackground(String... params) {
String serverResponse = null;
HttpClient httpClient = new DefaultHttpClient();
HttpContext httpContext = new BasicHttpContext();
HttpPost httpPost = new HttpPost("上传URL，如：http://www.xx.com/upload.php");
try {
CustomMultipartEntity multipartContent = new CustomMultipartEntity(
new ProgressListener() {
@Override
public void transferred(long num) {
publishProgress((int) ((num / (float) totalSize) * 100));
}
});
// We use FileBody to transfer an image
multipartContent.addPart("data", new FileBody(new File(
filePath)));
totalSize = multipartContent.getContentLength();
// Send it
httpPost.setEntity(multipartContent);
HttpResponse response = httpClient.execute(httpPost, httpContext);
serverResponse = EntityUtils.toString(response.getEntity());
} catch (Exception e) {
e.printStackTrace();
}
return serverResponse;
}
@Override
protected void onProgressUpdate(Integer... progress) {
pd.setProgress((int) (progress[0]));
}
@Override
protected void onPostExecute(String result) {
System.out.println("result: " + result);
pd.dismiss();
}
@Override
protected void onCancelled() {
System.out.println("cancle");
}
}

[java] view
plain copy

package com.lxb.uploadwithprogress.http;
import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.charset.Charset;
import org.apache.http.entity.mime.HttpMultipartMode;
import org.apache.http.entity.mime.MultipartEntity;
public class CustomMultipartEntity extends MultipartEntity {
private final ProgressListener listener;
public CustomMultipartEntity(final ProgressListener listener) {
super();
this.listener = listener;
}
public CustomMultipartEntity(final HttpMultipartMode mode,
final ProgressListener listener) {
super(mode);
this.listener = listener;
}
public CustomMultipartEntity(HttpMultipartMode mode, final String boundary,
final Charset charset, final ProgressListener listener) {
super(mode, boundary, charset);
this.listener = listener;
}
@Override
public void writeTo(OutputStream outstream) throws IOException {
super.writeTo(new CountingOutputStream(outstream, this.listener));
}
public static interface ProgressListener {
void transferred(long num);
}
public static class CountingOutputStream extends FilterOutputStream {
private final ProgressListener listener;
private long transferred;
public CountingOutputStream(final OutputStream out,
final ProgressListener listener) {
super(out);
this.listener = listener;
this.transferred = 0;
}
public void write(byte[] b, int off, int len) throws IOException {
out.write(b, off, len);
this.transferred += len;
this.listener.transferred(this.transferred);
}
public void write(int b) throws IOException {
out.write(b);
this.transferred++;
this.listener.transferred(this.transferred);
}
}
}

上面为两个基本的类，以下放一个调用的Activity

[java] view
plain copy

package com.lxb.uploadwithprogress;
import java.io.File;
import com.lxb.uploadwithprogress.http.HttpMultipartPost;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class MainActivity extends Activity implements OnClickListener {
private Context context;
private EditText et_filepath;
private Button btn_upload;
private Button btn_cancle;
private HttpMultipartPost post;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
context = this;
setContentView(R.layout.activity_main);
et_filepath = (EditText) findViewById(R.id.et_filepath);
btn_upload = (Button) findViewById(R.id.btn_upload);
btn_cancle = (Button) findViewById(R.id.btn_cancle);
btn_upload.setOnClickListener(this);
btn_cancle.setOnClickListener(this);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btn_upload:
String filePath = et_filepath.getText().toString();
File file = new File(filePath);
if (file.exists()) {
post = new HttpMultipartPost(context, filePath);
post.execute();
} else {
Toast.makeText(context, "file not exists", Toast.LENGTH_LONG).show();
}
break;
case R.id.btn_cancle:
if (post != null) {
if (!post.isCancelled()) {
post.cancel(true);
}
}
break;
}
}
}

当然，在Android中使用MultipartEntity类，必须为项目添加对应的jar包，httpmime-4.1.2.jar。

最后放上代码。project里已包括jar。

地址：

http://download.csdn.net/detail/shinay/4965230

巴特西

Android开发之httpclient文件上传实现

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