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我正在尝试将对象从服务器端发送到客户端，但我找不到问题。这是我在客户端遇到的错误：

java.io.StreamCorruptedException: invalid type code: 43
at java.io.ObjectInputStream.readObject0(Unknown Source)
at java.io.ObjectInputStream.readObject(Unknown Source)
at connection.MainClient.doAll(MainClient.java:56)
at connection.TestScreen$2.actionPerformed(TestScreen.java:82)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$200(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

下面是服务器端方法： 无限循环中的单独方法只是从文件中读取并将用户名和密码解析为 ArrayList，它们是服务器类中的实例变量。 

    public void doStuff() throws Exception
{
    ServerSocket serverSocket = new ServerSocket(5001);
    Socket clientSocket = serverSocket.accept();
    PrintWriter out = new PrintWriter(clientSocket.getOutputStream(), true);
    BufferedReader in = new BufferedReader(
            new InputStreamReader(
            clientSocket.getInputStream()));
    ObjectOutputStream objectOutput = new ObjectOutputStream(clientSocket.getOutputStream());
    String inputLine;
    out.println("Connected");
    while(true)
    {
        seperate();
        while ((inputLine = in.readLine()) != null) 
        {
            if(inputLine.equalsIgnoreCase("users"))
                objectOutput.writeObject(getUserNames());
            else
                if(inputLine.equalsIgnoreCase("pass"))
                    objectOutput.writeObject(getPassWords());
                else
                    if(inputLine.equalsIgnoreCase("stop"))
                        objectOutput.reset();
        }
    }
}

下面是客户端从服务器请求信息：

public boolean doAll(String name, String pass) throws Exception
{
    try 
    {
        kkSocket = new Socket("PC", 5001);
        out = new PrintWriter(kkSocket.getOutputStream(), true);
        in = new BufferedReader(new InputStreamReader(kkSocket.getInputStream()));
    } 
    catch (UnknownHostException e) 
    {
        System.err.println("Don't know about host: PC.");
        System.exit(1);
    }
    catch (IOException e) 
    {
        System.err.println("Couldn't get I/O for the connection to: PC.");
        System.exit(1);
    }

    ObjectInputStream objectInput = new ObjectInputStream(kkSocket.getInputStream());

    out.println("user");
    Object obj = objectInput.readObject();
    users = (ArrayList<String>)obj;
    out.println("pass");
    obj = objectInput.readObject();
    this.pass = (ArrayList<String>)obj;
    out.println("stop");
    objectInput.close();
    out.close();
    in.close();
    kkSocket.close();

    if(userIsRegistered(name,pass))
        return true;
    return false;
}

我是学习服务器套接字和套接字的新手，但我在这里想要完成的是这个。当我按下另一个班级的按钮时，我会这样做：

MainClient b = new MainClient();
login = b.doAll(userField.getText(),passField.getText());
Login is obviously a boolean.

几乎是服务器上的登录系统，当按下登录按钮时，它会调用客户端连接到该服务器并获取服务器上存储在指定目录中的文本文件中的用户和通行证列表。然后，当客户端收到此信息时，它会检查它是否可能是我从两个文本字段中获取的字符串中的用户，并返回真或假。然后关闭到服务器的套接字，它应该每次都保持重新连接，对吗？

我的主要问题是如何解决它不断抛出的错误？

4

2 回答 2

1

您不能InputStreamReader与字节输入流一起使用。它需要来自输入流的字符/字符串。请尝试使用ObjectInputStream。

只是一个提示：输入流类型应该在服务器端和客户端都匹配。你不能混合它们。在您使用的服务器上ObjectOutputStream，因此ObjectInputStream应在客户端上使用相应的。

于 2013-03-13T17:55:07.453 回答
1

您的代码流程如下：

  1. 服务器已启动并等待与客户端的连接
  2. 服务器接受来自客户端的连接，使用serverSocket.accept().
  3. 服务器使用对象通过向客户端发送String消息（“已连接”）。PrintWriterout.println("Connected")
  4. ObjectInputStream客户端正在使用导致流不匹配的对象读取该消息，因此违反了内部一致性检查。这就是为什么StreamCorruptedException在客户端抛出的原因。因此，与其使用ObjectInputStream读取服务器发送的普通消息，不如使用BufferedReader您在上面创建的对象.

因此，在客户端，您的代码应修改为：

ObjectInputStream objectInput = new ObjectInputStream(kkSocket.getInputStream());
String message = in.readLine();//use BufferedReader to read the plain message coming from Server.
System.out.println("Message from server: "+message);
out.println("user");
Object obj = objectInput.readObject();
于 2013-03-14T17:25:35.510 回答