java.io.StreamCorruptedException：无效的流标头：54657374

java.io.StreamCorruptedException: invalid stream header: 54657374

提问by androidGenX

I am trying to read a string which is send from client using Socket program, The code as follows:

我正在尝试使用 Socket 程序读取从客户端发送的字符串，代码如下：

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.lang.ClassNotFoundException;
import java.net.ServerSocket;
import java.net.Socket;

public class SocketServerExample {

    //static ServerSocket variable
    private static ServerSocket server;
    //socket server port on which it will listen
    private static int port = 5000;

    public static void main(String args[]) throws IOException, ClassNotFoundException{
        //create the socket server object
        server = new ServerSocket(port);
        //keep listens indefinitely until receives 'exit' call or program terminates
        while(true){
            System.out.println("Waiting for client request");
            //creating socket and waiting for client connection
            Socket socket = server.accept();
            //read from socket to ObjectInputStream object
            ObjectInputStream ois = new ObjectInputStream(socket.getInputStream());
            //convert ObjectInputStream object to String
            String message = (String) ois.readObject();
            System.out.println("Message Received: " + message);
            //create ObjectOutputStream object
            ObjectOutputStream oos = new ObjectOutputStream(socket.getOutputStream());
            //write object to Socket
            oos.writeObject("Hi Client "+message);
            //close resources
            ois.close();
            oos.close();
            socket.close();
            //terminate the server if client sends exit request
            if(message.equalsIgnoreCase("exit")) break;
        }
        System.out.println("Shutting down Socket server!!");
        //close the ServerSocket object
        server.close();
    }

}

But I am getting error as follows while reading the string from client:

但是从客户端读取字符串时出现如下错误：

Exception in thread "main" java.io.StreamCorruptedException: invalid stream header: 54657374
    at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:803)
    at java.io.ObjectInputStream.<init>(ObjectInputStream.java:298)
    at SocketServerExample.main(SocketServerExample.java:29)

I searched and not managed find the bug. Please help me.

我搜索并没有设法找到错误。请帮我。

采纳答案by user207421

Clearly you aren't sending the data with ObjectOutputStream:you are just writing the bytes.

显然，您不是在发送数据，ObjectOutputStream:而是在写入字节。

• If you read with readObject()you must write with writeObject().
• If you read with readUTF()you must write with writeUTF().
• If you read with readXXX()you must write with writeXXX(),for most values of XXX.

• 如果你阅读，readObject()你必须写作writeObject().
• 如果你阅读，readUTF()你必须写作writeUTF().
• 如果您使用 with 阅读，则readXXX()必须writeXXX(),为 XXX 的大多数值编写 with 。

回答by Peter Lawrey

You can't expect ObjectInputStreamto automagically convert text into objects. The hexadecimal 54657374is "Test"as text. You must be sending it directly as bytes.

您不能指望ObjectInputStream自动将文本转换为对象。十六进制54657374是"Test"文本。您必须直接将其作为字节发送。