Android有两套http的API，刚开始使用网络编程时多少有些迷惑到底用哪个好呢？其实孰优孰劣无需再争论，google已经指出HttpUrlConnection是Android更优的选择，并在SDK文档中引用了博客（需要代理访问）http://android-developers.blogspot.com/2011/09/androids-http-clients.html来阐述各自的优缺点。国内也有些博客大致翻译了上面的内容，并对了一些测试，可惜测试不严密，某博客甚至得出HttpUrlConnection的下载速度快几倍的结论，其实并没有公平反映出二者的下载速度。
虽然我已经使用过HttpUrlConnection实现了一个轻量级http引擎用于下载，但是好奇心还是促使我写了一个测试程序用于比较二者的性能。由于HttpClient仅仅是一个接口，所以我选用了其实现类DefaultHttpClient和HttpUrlConnection做比较，方法很简单，分别下载同一个文件10次，然后计算耗时的平均值，测试代码片段如下：
@Override
public void onClick(View v)
{
if (v.equals(mTestHttpClientBtn))
{
new Thread(new Runnable()
{
@Override
public void run()
{
long averageTime = 0;
for (int i = 0; i < 10; i++)
{
File file = new File(getFilesDir(), String.valueOf(i) + ".file");
FileOutputStream fileOutputStream = null;
try
{
fileOutputStream = new FileOutputStream(file);
}
catch (FileNotFoundException e)
{
Log.e(TAG, "", e);
return;
}
long startTime = System.currentTimeMillis();
testHttpClient(fileOutputStream);
long stopTime = System.currentTimeMillis();
averageTime += stopTime - startTime;
}
averageTime /= 10;
// 测试完成
Message msg = new Message();
msg.what = MSG_TEST_HTTP_CLIENT_DONE;
msg.obj = averageTime;
mHandler.sendMessage(msg);
}
}).start();
return;
}
if (v.equals(mTestHttpUrlConnectionBtn))
{
new Thread(new Runnable()
{
@Override
public void run()
{
long averageTime = 0;
for (int i = 0; i < 10; i++)
{
File file = new File(getFilesDir(), String.valueOf(i + 10) + ".file");
FileOutputStream fileOutputStream = null;
try
{
fileOutputStream = new FileOutputStream(file);
}
catch (FileNotFoundException e)
{
Log.e(TAG, "", e);
return;
}
long startTime = System.currentTimeMillis();
testHttpUrlConnection(fileOutputStream);
long stopTime = System.currentTimeMillis();
averageTime += stopTime - startTime;
}
averageTime /= 10;
// 测试完成
// 返回栏目页：http://www.bianceng.cnhttp://www.bianceng.cn/OS/extra/
Message msg = new Message();
msg.what = MSG_TEST_HTTP_URL_CONNECTION_DONE;
msg.obj = averageTime;
mHandler.sendMessage(msg);
}
}).start();
return;
}
}
private void testHttpClient(FileOutputStream fileOutputStream)
{
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpEntity entity = null;
InputStream inputStream = null;
try
{
HttpGet httpGet = new HttpGet(TEST_URL);
HttpResponse httpResponse = httpClient.execute(httpGet);
StatusLine statusLine = httpResponse.getStatusLine();
if (statusLine == null)
{
throw new Exception("no status line !!!");
}
int responseCode = statusLine.getStatusCode();
if (responseCode < 200 || responseCode >= 300)
{
throw new Exception("response error !!!");
}
entity = httpResponse.getEntity();
if (entity == null)
{
throw new Exception("no entity !!!");
}
inputStream = entity.getContent();
int bytesRead = -1;
byte[] buffer = new byte[4096];
while ((bytesRead = inputStream.read(buffer)) != -1)
{
fileOutputStream.write(buffer, 0, bytesRead);
}
}
catch (Exception e)
{
Log.e(TAG, "", e);
}
finally
{
try
{
if (inputStream != null)
{
inputStream.close();
}
if (entity != null)
{
entity.consumeContent();
}
if (fileOutputStream != null)
{
fileOutputStream.flush();
fileOutputStream.close();
}
}
catch (Exception e)
{
Log.e(TAG, "", e);
}
}
}
private void testHttpUrlConnection(FileOutputStream fileOutputStream)
{
HttpURLConnection httpURLConnection = null;
InputStream inputStream = null;
try
{
httpURLConnection = (HttpURLConnection) new URL(TEST_URL).openConnection();
httpURLConnection.setRequestMethod("GET");
httpURLConnection.connect();
int responseCode = httpURLConnection.getResponseCode();
if (responseCode < 200 || responseCode >= 300)
{
throw new Exception("response error !!!");
}
inputStream = httpURLConnection.getInputStream();
int bytesRead = -1;
byte[] buffer = new byte[4096];
while ((bytesRead = inputStream.read(buffer)) != -1)
{
fileOutputStream.write(buffer, 0, bytesRead);
}
}
catch (Exception e)
{
Log.e(TAG, "", e);
}
finally
{
try
{
if (inputStream != null)
{
inputStream.close();
}
if (httpURLConnection != null)
{
httpURLConnection.disconnect();
}
if (fileOutputStream != null)
{
fileOutputStream.flush();
fileOutputStream.close();
}
}
catch (Exception e)
{
Log.e(TAG, "", e);
}
}
}
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