问题描述
请参阅问题和Jon Skeet的回答。
Well please see this question and Jon Skeet's answer first.
这次我有这个服务器：
public class SimpleServer {
public static void main(String[] args) throws Exception {
ServerSocket serverSocket = new ServerSocket(8888);
System.out.println("Server Socket created, waiting for client...");
Socket accept = serverSocket.accept();
InputStreamReader inputStreamReader = new InputStreamReader(accept.getInputStream());
char[] chars = new char[5];
System.out.println("Client connected, waiting for input");
while (true) {
inputStreamReader.read(chars,0,chars.length);
for (int i=0;i<5;i++) {
if(chars[i]!='\u0000') {
System.out.print(chars[i]);
}
}
inputStreamReader = new InputStreamReader(accept.getInputStream());
chars = new char[5];
}
}
}
当我从客户端发送字符123456789，这是我在服务器终端中看到的，但我不应该只看到12345？
And when I send the characters "123456789" from the client, this is what I exactly see in the Servers terminal, but should not I be seeing only 12345 ?
为什么行为不同？
推荐答案
您的客户有设置为一次仅发送 5个字符，然后刷新 - 所以即使 InputStreamReader 可能询问对于更多的数据，它收到的更少，然后发现它可以满足你的5个字符的请求。
Your client has been set up to only send 5 characters at a time, and then flush - so even though the InputStreamReader probably asked for more data than that, it received less, and then found that it could satisfy your request for 5 characters with what it had got.
尝试更改服务器上的代码只能一次读取 3 字符而不是5（但让客户端发送5），你可能会看到行为上的差异。你可能不，请注意 - 它将取决于数据如何移动的时间周围的许多不同的事情。
Try changing the code on the server to only read 3 characters at a time instead of 5 (but leave the client sending 5) and you may well see a difference in behaviour. You may not, mind you - it will depend on a lot of different things around the timing of how the data is moving around.
基本上教训应该是你不想在同一个流上构建多个读者 - 由于缓冲，很难预测会发生什么。
Basically the lesson should be that you don't want to be constructing multiple readers over the same stream - it becomes hard to predict what will happen, due to buffering.
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