[转]Socket与此同时使用ObjectInputStream和ObjectOutputStream传输序列化对象时的顺序

socketserializationconstructorstreamheader通讯在服务器和客户端建立输入输出流：

oos=new ObjectOutputStream(socket.getOutputStream());
ois=new ObjectInputStream(socket.getInputStream());

十分关键的一点是：ObjectInputStream与ObjectOutputStream的顺序问题

在网络通讯中，主机与客户端若使用ObjectInputStream与ObjectOutputStream建立对象通讯，必须注重声明此两个对象的顺序。
如：
主机端先建立ObjectInputStream后建立ObjectOutputStream，则对应地客户端要先建立ObjectOutputStream后建立ObjectInputStream，否则会造成两方互相等待数据而导致死锁。
原因是建立ObjectInputStream对象是需要先接收一定的header数据，接收到这些数据之前会处于阻塞状态。

public ObjectInputStream(InputStream in) throws IOException的官方API显示：Creates an ObjectInputStream that reads from the specified InputStream. A serialization stream header is read from the stream and verified. This constructor will block until the corresponding ObjectOutputStream has written and flushed the header.

在创建ObjectInputStream对象时会检查ObjectOutputStream所传过来了头信息，如果没有信息将一直会阻塞

正确的做法：

Server:

[java] view plaincopyprint?
01.socket = ss.accept(); 
02.                     
03.ObjectInputStream ois = new ObjectInputStream(socket.getInputStream()); 
04.ObjectOutputStream oos = new ObjectOutputStream(socket.getOutputStream()); 
socket = ss.accept();
     
ObjectInputStream ois = new ObjectInputStream(socket.getInputStream());
ObjectOutputStream oos = new ObjectOutputStream(socket.getOutputStream());

Client:

[java] view plaincopyprint?
01.Socket socket = new Socket("10.0.2.2", 10000); 
02.socket.setSoTimeout(10000); 
03.                 
04.ObjectOutputStream oos = new ObjectOutputStream(socket.getOutputStream()); 
05.ObjectInputStream ois = new ObjectInputStream(socket.getInputStream()); 
Socket socket = new Socket("10.0.2.2", 10000);
socket.setSoTimeout(10000);
    
ObjectOutputStream oos = new ObjectOutputStream(socket.getOutputStream());
ObjectInputStream ois = new ObjectInputStream(socket.getInputStream());

转自：http://blog.csdn.net/alrdy/article/details/7718174