Question

我正在尝试将服务器端的对象发送到客户端，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)

以下是服务器端方法：无限循环中的单独方法只是从文件读取并将用户名和密码解析为ArrayList，它们是Server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();
        }
    }
}

以下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，但我想在这里完成的是这个。当我按下另一个班级的按钮时，我这样做：

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，用于清除按下登录按钮的位置，它调用客户端连接到此服务器并获取存储在指定目录中的文本文件中的服务器上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来自Strings的用户从两个文本字段获取并返回true或false。然后关闭服务器的套接字，它应该每次都保持重新连接吗？

我的主要问题是你如何解决它一直抛出的错误？

Answer 1

您不能将InputStreamReader与字节输入流一起使用。它期望来自输入流的字符/字符串。请改为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ObjectOutputStream的服务器上，因此应在客户端上使用相应的ObjectInputStream。

Answer 2

您的代码流程如下：

服务器已启动并正在等待与客户端的连接
服务器使用serverSocket.accept()接受来自客户端的连接。
服务器通过String使用PrintWriter对象向客户端发送out.println("Connected")消息（“已连接”）。
客户端正在使用ObjectInputStream对象读取该消息，这会导致流不匹配，从而违反内部一致性检查。这就是为什么StreamCorruptedException被抛出到客户端。所以不要使用{ {1}}要阅读服务器发送的简单消息，您应该使用上面创建的ObjectInputStream对象。

因此，在客户端，您的代码应修改为：

BufferedReader

使用TCP over socket将ArrayList从服务器端发送到客户端

2 个答案: