弟刚接触J2ME想做个如下功能：应用MTK手机将照片通过GRPS 传到服务器上遇到的问题

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弟刚接触J2ME想做个如下功能：应用MTK手机将照片通过GRPS 传到服务器上遇到的问题 20

现在遇到的问题是模拟器测试好用，可是拷到MTK手机上测试的时候。图片一致被占用。经过调试发现时在写文件的时候产生了阻塞。请各位帮忙看下。
客户端代码：

public class SaveFileClass extends Thread {
Displayable disp = null;
Display ds = null;
Displayable successDisp = null;
byte[] bimg = null;
OutputStream dos = null;
SocketConnection sc;
String ip="";
String port="";

public SaveFileClass(Display dis, Displayable backScreen,
   Displayable successScreen, byte[] b,String ip,String port) {
ds = dis;
disp = backScreen;
successDisp = successScreen;
bimg = b;
this.ip=ip;
this.port=port;
}

public void run() {
try {
   String url="socket://"+ip+":"+port;
   System.out.println("url"+url);
   sc = (SocketConnection) Connector.open(url);
   dos = sc.openOutputStream();
   dos.write(bimg);
   dos.flush();

   dos.close();
   sc.close();

   Alert altSuccess = new Alert("提示", "          发送成功！", null,AlertType.INFO);
   altSuccess.setTimeout(2000);
   ds.setCurrent(altSuccess, successDisp);

} catch (IOException ioe) {
   Alert altSuccess = new Alert("提示", "          发送失败！", null,AlertType.ERROR);
   altSuccess.setTimeout(2000);
   ds.setCurrent(altSuccess, successDisp);
   try {
    dos.close();
    sc.close();
   } catch (IOException e) {
    e.printStackTrace();
   }

}
}
}
服务器端

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.UUID;

public class NewMain {

public static void main(String[] args) {
ServerSocket server = null;
Socket socket = null;
try {
   server = new ServerSocket(12345);
   socket = server.accept();
   new ReceiveImage(server, socket).start();

} catch (IOException e) {
   try {
    e.printStackTrace();
    server.close();
    socket.close();
   } catch (IOException e1) {
    socket=null;
    server=null;
   }

}
}

}

class ReceiveImage extends Thread {
Socket socket;
ServerSocket server;

public ReceiveImage(ServerSocket server, Socket socket) {
this.server = server;
this.socket = socket;
}

public void run() {
   try {
     try {
     Thread.sleep(10000);
    } catch (InterruptedException e1) {
     // TODO Auto-generated catch block
     e1.printStackTrace();
    }
    System.out.println("客户端已经连接上"+socket);
    InputStream is = socket.getInputStream();
    String name = UUID.randomUUID().toString();
    System.out.println(name);
    FileOutputStream os = new FileOutputStream("c://" + name+ ".jpg");

    byte[] buffer = new byte[4096];
    int size = 0;
    do{

     size=is.read(buffer);
    if(size!=-1){
      os.write(buffer, 0, size);
     }    //此处用MTK手机测试时候在循环内处于阻塞（等待）状态。
    }while(size!=-1);

    os.flush();
    os.close();
    is.close();
   } catch (IOException e) {
    e.printStackTrace();
   }
}

}

J2ME