Question

我有一个通过socket连接的客户端/服务器。客户端写入要由服务器读取的整数值我在readInt()中使用ObjectOutputStream来写入此值在服务器端，我使用readInt()中的ObjectInputStream来读取此值。但服务器没有读任何内容，它冻结在readInt() 使用ObjectInputStream阅读时出现什么问题？我使用DataOutputStream，读写成功，但ObjectInputstream可以读取整数和其他原始类型，有什么问题？

public class Server {
ServerSocket listener;
private static final int PORT = 9001;
private Socket socket;
private ObjectInputStream obin = null;
private ObjectOutputStream obout = null;
public Server() throws Exception{
    listener = new ServerSocket(PORT);
    run();
}
public void run() throws Exception{
    socket = listener.accept();
    obout = new ObjectOutputStream(socket.getOutputStream());
    obout.flush();
    obin = new ObjectInputStream(socket.getInputStream());
    int h=obin.readInt();
    System.out.println(h);
    obout.writeInt(77); 
}
 public static void main(String[] args) throws Exception {
        Server s = new Server();
    }
 }

和客户

public class Client {
 private ObjectInputStream oin = null;
 private ObjectOutputStream oot = null;
 private Socket socket = null;
 public Client() throws Exception{
    String serverAddress = "127.0.0.1";
    socket = new Socket(serverAddress, 9001);
    oot = new ObjectOutputStream(socket.getOutputStream());
    oot.flush();
    oin = new ObjectInputStream(socket.getInputStream());
    oot.writeInt(66);
    int u = oin.readInt();
    System.out.println(u);
}
public static void main(String[] args) throws Exception{
    Client c= new Client();
}
}

当你运行这个代码时应该到达服务器66 在客户端77，但实际上我什么都没得到。为什么呢？

Answer 1

每次写入后都应该刷新（），因为它会清除通过网络发送字节的输出缓冲区。所以你的服务器运行方法应该是：

public void run() throws Exception {
    socket = listener.accept();

    obin = new ObjectInputStream(socket.getInputStream());
    int h = obin.readInt();
    System.out.println(h);

    obout = new ObjectOutputStream(socket.getOutputStream());
    obout.writeInt(77);
    obout.flush();
}

和您的客户端构造函数：

public Client() throws Exception {
    String serverAddress = "127.0.0.1";
    socket = new Socket(serverAddress, 9001);

    oot = new ObjectOutputStream(socket.getOutputStream());
    oot.writeInt(66);
    oot.flush();

    oin = new ObjectInputStream(socket.getInputStream());
    int u = oin.readInt();
    System.out.println(u);
}

如果您将此作为练习，那很好，但如果您要在生产中运行基于此的代码，请考虑使用更高级别的网络库，如protocol buffers。

通过对象流进行读写

1 个答案: