我无法弄清楚为什么带有Socket
和ServerSocket
的Java Server在发送对象时速度很慢。这里有一个小ping程序来演示我的问题。如果我在同一台机器上同时运行客户端和服务器,那么一切都很好(< 1ms ping time)。但是,如果我将服务器移动到Linux机器上,我的ping时间大于500毫秒(通过命令行ping到该机器说20ms)。
提前致谢
服务器
public static void main(String[] args) {
try {
ServerSocket serverSocket = new ServerSocket(Integer.parseInt(args[0]));
Socket socket = serverSocket.accept();
ObjectInputStream ois = new ObjectInputStream(socket.getInputStream());
ObjectOutputStream oos = new ObjectOutputStream(socket.getOutputStream());
oos.writeObject(System.currentTimeMillis());
long time = (long)ois.readObject();
System.out.println(System.currentTimeMillis()-time+" ms");
} catch (Exception e) {
System.out.println("Some error occured");
System.exit(1);
}
}
客户端:
public static void main(String[] args) {
try {
Socket socket = new Socket(args[0], Integer.parseInt(args[1]));
ObjectOutputStream oos = new ObjectOutputStream(socket.getOutputStream());
ObjectInputStream ois = new ObjectInputStream(socket.getInputStream());
long time = (long)ois.readObject();
oos.writeObject(time);
} catch (Exception e) {
System.out.println("Some error occured");
System.exit(1);
}
}
答案 0 :(得分:4)
我在网上看了一下,你不是唯一有这个问题的人。这是post also describes the same issue,
基本上,你应该做的不是:
ObjectOutputStream oos = new ObjectOutputStream(socket.getOutputStream());
ObjectInputStream ois = new ObjectInputStream(socket.getInputStream());
你应该写:
ObjectOutputStream oos = new ObjectOutputStream(new BufferedOutputStream(socket.getOutputStream()));
ObjectInputStream ois = new ObjectInputStream(new BufferedInputStream(socket.getInputStream()));
定期你会写:
oos.flush();//Write after you send data
答案 1 :(得分:1)
我遇到了同样的问题,简单的连接已经ping了大约400ms。尝试在套接字创建后添加此行:
socket.setTcpNoDelay(true);