Java 无法实例化ObjectInputStream以从用户读取输入

我不能添加ObjectInputStream来读取用户的输入，它总是在该点阻塞。如果我删除服务器中的ObjectInputStream，该服务器应该从用户处读取输入，然后发送硬编码字符串，则该代码可以正常工作。幕后发生了什么？我知道，当创建ObjectOutputStream时，它会发送一个标头，当创建ObjectInputStream时，它会读取该标头。在尝试实例化oOISUser之前，是否需要刷新系统中的某些内容

这是客户端的代码：

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.Socket;

public class Client {
    public Client() {
        Socket oS = null;
        ObjectOutputStream oOOS = null;
        ObjectInputStream oOIS = null;

        try {
            oS = new Socket("127.0.0.1", 1025);
            oOOS = new ObjectOutputStream(oS.getOutputStream());
            oOIS = new ObjectInputStream(oS.getInputStream());

            System.out.println("client receives: " + (String) oOIS.readObject());
            String sToSend = "hello from client";
            System.out.println("client says: " + sToSend);
            oOOS.writeObject(sToSend);
            oOOS.flush();

        } catch (IOException e) {
            System.out.println(e.getMessage());
        } catch (ClassNotFoundException e) {
            System.out.println(e.getMessage());
        } finally {
            try {
                if (oS != null) oS.close();
                if (oOOS != null) oOOS.close();
                if (oOIS != null) oOIS.close();
            } catch (IOException e) {
                System.out.println(e.getMessage());
            }
        }
    }
    public static void main(String[] args) {
        Client c = new Client();
    }

}

你在问题中自己说过：

创建ObjectInputStream时，它将读取该标头

因此，您实际上是在等待用户在控制台中输入ObjectInputStream头。除非文件通过管道传输到System.in，否则这种情况发生的可能性非常小。从System.in读取序列化的Java对象没有什么意义。用户不可能在控制台中键入有效的序列化Java对象。不过，他/她可以输入文本。因此，请使用阅读器或扫描仪

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.Socket;

public class Client {
    public Client() {
        Socket oS = null;
        ObjectOutputStream oOOS = null;
        ObjectInputStream oOIS = null;

        try {
            oS = new Socket("127.0.0.1", 1025);
            oOOS = new ObjectOutputStream(oS.getOutputStream());
            oOIS = new ObjectInputStream(oS.getInputStream());

            System.out.println("client receives: " + (String) oOIS.readObject());
            String sToSend = "hello from client";
            System.out.println("client says: " + sToSend);
            oOOS.writeObject(sToSend);
            oOOS.flush();

        } catch (IOException e) {
            System.out.println(e.getMessage());
        } catch (ClassNotFoundException e) {
            System.out.println(e.getMessage());
        } finally {
            try {
                if (oS != null) oS.close();
                if (oOOS != null) oOOS.close();
                if (oOIS != null) oOIS.close();
            } catch (IOException e) {
                System.out.println(e.getMessage());
            }
        }
    }
    public static void main(String[] args) {
        Client c = new Client();
    }

}

new ObjectInputStream(System.in)