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[英]readLine() from DataInputStream doesn't receive data correctly
[英]Socket readLine() doesn't receive line sent
我正在建立一个客户服务器项目。
我需要的是客户端发送一个字符串,例如“ Pendu”,服务器接收该字符串,然后将一个名为“ Pendu”的对象发送回客户端。
这是我的代码:
// server
ServerSocket serverSocket = new ServerSocket(6789);
System.out.println("accepting...");
Socket socket = serverSocket.accept();
BufferedReader inFromClient = new BufferedReader(new InputStreamReader(socket.getInputStream()));
ObjectOutputStream outToClient = new ObjectOutputStream(socket.getOutputStream());
String clientMsg = inFromClient.readLine();
System.out.println("Received from client: " + clientMsg);
Object obj;
System.out.println("building object...");
obj = Class.forName("Data." + clientMsg).newInstance();
System.out.println("object built");
if(obj instanceof Pendu)
{
System.out.println("Send to client: " + obj);
outToClient.writeObject(new Pendu());
}
//client
Socket socket = new Socket("localhost", 6789);
DataOutputStream outToServer = new DataOutputStream(socket.getOutputStream());
System.out.println("sending...");
outToServer.writeBytes("Pendu");
System.out.println("sent");
ObjectInputStream ois = new ObjectInputStream(socket.getInputStream());
System.out.println("receiving...");
Object obj = ois.readObject(); // it is blocked here and I don't know why
System.out.println("received");
Pendu
类在包Data
定义:
package Data;
public class Pendu implements Serializable
{
private static final long serialVersionUID = 1L;
private static String[] words = new String[]{"bonjour", "bonsoir", "hier", "france", "ordinateur"};
private static Random rand = new Random();
private String but;
public Pendu()
{
this.but = words[rand.nextInt(words.length)];
}
public int getLenth()
{
return this.but.length();
}
public String getBut()
{
return this.but;
}
@Override
public String toString()
{
return "I'm a pendu object";
}
}
我的问题是:
首先,我执行服务器,然后可以看到控制台中显示了正在accepting...
然后执行客户端,在控制台中,我收到如下消息:
sending...
sent
receiving...
同时,服务器端未显示任何新内容。
现在,我停止客户端,并显示服务器的所有其他消息:
Received from client: Pendu
building object...
object built
当然我也得到错误:
java.net.SocketException:管道损坏
这是合乎逻辑的,因为我杀死了尚未完成接收的客户端。
我不知道为什么客户不能收到预期的结果。
您正在阅读的行,而不是在写行。 您需要在"Pendu"
消息中添加行终止符。
注意:发送Pendu
,为什么要发送新的Pendu
而不是刚创建的Pendu
?
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