java socket服务器 ，socket.getInputStream()读取时阻塞

贴代码：

public static void main(String[] args){

MessageDeal deal = new MessageDeal();
deal.init();
}
public void init(){
try {
ServerSocket serverSocket = new ServerSocket(port);
Socket socket = null;
while (true){
socket = serverSocket.accept();
DealThread dealThread = new DealThread(socket);
new Thread(dealThread).start();
}
} catch (IOException e) {
e.printStackTrace();
}

}
private class DealThread implements Runnable{
private Socket socket;
public DealThread(Socket socket){
this.socket = socket;
}
@Override
public void run() {
BufferedWriter writer = null;
InputStream in = null;
BufferedReader reader = null;
OutputStream os = null;
try {
System.out.println("开始读流");
in = socket.getInputStream();
/*reader = new BufferedReader(new InputStreamReader(in,"GBK"));
char[] bt = new char[8];
do  {
if ((reader.read(bt))!=-1){
//                        System.out.println(data);
}
}while (reader.ready());
socket.shutdownInput();
System.out.println("读取完毕");*/
BufferedInputStream bis = new BufferedInputStream(in);
int n = 0;
while ( (n =bis.read()) != -1){
System.out.println(n);
}
os = socket.getOutputStream();
writer = new BufferedWriter(new OutputStreamWriter(os, "GBK"));
writer.write(successMsg);
writer.flush();
}catch (Exception e){
e.printStackTrace();
}finally {
try {
if (reader != null) reader.close();
if (in != null) in.close();
if (writer != null) writer.close();
if (os != null) os.close();
if (socket != null) socket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}

使用阻塞javaio读取socket流时，在红色部分进行while循环时始终无法读到-1，使用各种XXStream和XXReader都不行，网上借鉴的还是不靠谱，

反复查看java doc也没能解决

参考一下博客：http://blog.csdn.net/qq_27680317/article/details/72899394
解释为：socket流没有结束符。。。
虽然不知道这个解释对不对，但是使用注释掉的代码替换红色部分，正常运行
使用javaio读取socket接收的无协议传输流，使用ready()方法可以解决一次性完整读取问题