急！ socket 客户端接收大于10K的数据，接收不完整

我对socket不熟悉，但是这个事挺急，请各位帮我看看。谢谢了啊 ，分不够再加！！！

socket 向服务端请求数据，返回的数据如果小于10K，那么能看到xml的整个完整的格式如下：
<?xml version="1.0" encoding="GBK"?>
<root>
<header>
<name>
....
</name>
.....
</header>
</root>

如果大于10K，XML就不完整了，解析出来少了一部分，反正看不到结尾的</root>节点.... 换成循环读取貌似也是一样。。客户端代码如下:

public String buildSocket4Sync(SocketConn sm, HostVO address, String cmd)

	{

		BufferedReader br = null;

		InputStream in = null;

		String result = "";

		try

		{

			socket = new Socket(address.getIp(), address.getPort());

			OutputStream socketOut = socket.getOutputStream();

			socketOut.write(cmd.getBytes());

			socketOut.write("\r\n".getBytes());



			in = socket.getInputStream();

			br = new BufferedReader(new InputStreamReader(in, "utf-8"));

			String re;

			StringBuffer sbf = new StringBuffer();

			while ((re = br.readLine()) != null)

			{

				sbf.append(re);

			}



			if (sbf.length() != 0)

			{

				result = new String(Base64.decode(sbf.toString()), "utf-8");

				// System.out.println(result);



			}



		}

		catch (IOException e)

		{

			e.printStackTrace();

		}

		finally

		{

			try

			{

				if (null != br)

				{

					br.close();

				}

				in.close();

			}

			catch (IOException e)

			{

				e.printStackTrace();

			}

		}

		return result;

	}

急啊，感谢感谢！