java - 读取我从 Java 服务器发送的对象

Question

您好，我正在尝试将一个对象发送到服务器，然后在服务器接收到该对象后，从服务器获取同一对象并将其作为客户端输出中的字符串读取。我最初发送的消息似乎有效，而之后的所有消息都无效，这是我的代码:

import java.io.*;
import java.net.*;


public class GUGLi {
    static Socket socket = null;
    static ObjectOutputStream out = null;
    static ObjectInputStream in = null;
    String host = "host";

       public static void main(String[] args) throws IOException {

    try {
        OpenPort();
        InfoSent();
        ReadInfo();



        String line;
        while ((line = in.toString()) != null) {
            System.out.println(line);
        }

    } catch (UnknownHostException e) {
        System.err.println("Don't know about host: " + "host");
        System.exit(1);
    } catch (IOException e) {
        System.err.println("Couldn't get I/O for "
                + "the connection to: " + "host");
        System.exit(1);
    in.close();
    socket.close();
    out.close();
     }
    }
public static void OpenPort() throws UnknownHostException, IOException{
        socket = new Socket ("host", 7879);
    }
public static void InfoSent()throws IOException {
            Student info = new Student (22, "Guglielmo", "Male",
                    "email", "#");
           out = new ObjectOutputStream(socket.getOutputStream());  
           out.writeObject(info);
           System.out.println("Sent: " + info);
           out.flush();
           }
 public static void ReadInfo()throws IOException {
         in = new ObjectInputStream(socket.getInputStream());


}
       }

Answer 1

line = in.toString() 不读取行。它将 InputStream 转换为其字符串表示形式。您需要调用读取方法。如果您希望读取行，则需要 BufferedInputStream.readLine()。但是，如果您通过同一套接字读取对象，则无法混合流/读取器类型，因此您应该使用 readUTF() 读取并使用 writeUTF() 写入另一端。