我正在尝试将文件从PC下载到Android设备（仿真器或物理设备）
对于中小型文件，一切正常，但是当我尝试发送大于10Mb的内容时，服务器永远不会到达此语句out2.println("ready");，因此客户端挂起了"ready"从服务器的等待，
似乎服务器卡在了这里：os.write(bytearray, 0, bytearray.length);
到目前为止，我已经在模拟器上进行了尝试，我将在不久的将来在真实设备上报告结果
这是我在Android应用程序中的客户端部分：Android客户端向服务器发送“下载”字符串，然后从服务器接收“就绪”回复，并开始从InputStream读取文件
int filesize = 2022386;
int bytesRead;
int currentTot = 0;
Socket socket1 = new Socket("172.16.6.119", 50001); //data line
Socket socket2 = new Socket("172.16.6.119", 50001); //control line
BufferedReader in2 = new BufferedReader(new InputStreamReader(socket2.getInputStream()));
PrintWriter out2 = new PrintWriter(socket2.getOutputStream(), true);
out2.println("download:"); //control line
String usrtxt = in2.readLine();
if(usrtxt.substring(0,5).equals("ready")) //control line
{
byte [] bytearray = new byte [filesize];
InputStream is = socket1.getInputStream(); //data line
FileOutputStream fos = new FileOutputStream(Environment.getExternalStorageDirectory().toString() + "/sunset.jpg");
BufferedOutputStream bos = new BufferedOutputStream(fos);
bytesRead = is.read(bytearray,0,bytearray.length);
currentTot = bytesRead;
Log.e("DOWNLOAD", "init value: bytesread = " + Integer.toString(bytesRead));
do {
bytesRead =
is.read(bytearray, currentTot, (bytearray.length-currentTot)); //<--does not pull data (WHY?)
Log.e("DOWNLOAD", "bytesread = " + Integer.toString(bytesRead));
if(bytesRead >= 0) currentTot += bytesRead;
} while(bytesRead > -1);
out1.println("finished:");
bos.write(bytearray, 0 , currentTot);
Log.e("DOWNLOAD", Integer.toString(currentTot));
bos.flush();
bos.close();
socket1.close(); socket2.close();
}
这是我的服务器代码：它接受来自客户端的连接，然后从客户端接收“下载”字符串，回复“就绪”，然后将文件放入OutputStream
while (true) {
final Socket socket = serverSocket.accept(); //data line
final Socket socket2= serverSocket.accept(); //control line
BufferedReader in2 = new BufferedReader(new InputStreamReader(socket2.getInputStream()));
PrintWriter out2 = new PrintWriter(socket2.getOutputStream(), true);
String usrtxt = in2.readLine(); //control line
if(usrtxt.substring(0,8).equals("download"))
{
System.out.println("accepted download request. sending file");
File transferFile = new File("sunset.jpg");
byte[] bytearray = new byte[(int)transferFile.length()];
FileInputStream fin = new FileInputStream(transferFile);
BufferedInputStream bin = new BufferedInputStream(fin);
bin.read(bytearray, 0, bytearray.length);
OutputStream os = socket.getOutputStream();
os.write(bytearray, 0, bytearray.length); //data line
os.flush();
os.close();
out2.println("ready"); //control line
socket.close(); socket2.close();
bin.close(); fin.close();
System.out.println("file transfer complete");
}//end if
}//end while
这是无法复制流的方法。它假定了太多可能不正确的事情。
Java中的规范方法如下：
byte[] buffer = new byte[8192]; // or whatever you like, anything above zero. Note that it doesn't have to be the size of the file
int count;
while ((count = in.read(buffer)) > 0)
{
out.write(buffer, 0, count);
}
如果您事先知道了长度，并且想在以后保持套接字打开状态，请通过“ total + = count;”跟踪到目前为止已传输的字节数。在循环内的read调用之后，将read调用更改为read(buffer, 0, length-total > buffer.length ? buffer.length : (int)(length-total))。
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