java - 通过套接字发送字符串时 Java 流损坏
问题描述
当我尝试从套接字接收新消息时，我不断收到以下错误：java.io.StreamCorruptedException: invalid type code: 00
我不明白这是如何或为什么发生的，其他堆栈溢出答案没有帮助，我已经在代码中指出了它被抛出的那一行，有什么想法吗？我使用相同的输入流和套接字流来监听所有线程。
发送消息时，对等方必须“挖掘”消息并将更新的bloomchain发送回原始发送者，发送者必须检查该链的有效性，如果有效，则用新链覆盖本地链。
// Any other ThreadPool can be used as well
private ExecutorService cachedExecutor = null;
private ExecutorService singleThreadExecutor = null;
// port this client shall listen on
private int port = 0;
// Name of the client
private String name = null;
// indicates that a connection is ongoing
private boolean isConnected = false;
// the socket the Client is currently connected with
private Socket activeConenctionSocket = null;
// The ServerSocket which will be listening for any incoming connection
private ServerSocket listener = null;
// stream handles incoming blockchain data
private static ObjectInputStream inputStream = null;
// stream handles outgoing objects
private static ObjectOutputStream outputStream = null;
// local instance of the blockchain
private BloomChain bloomChain = null;
private Gson gson = null;
/**
* @param port Port number by which this client shall be accessed.
* @param name The name of this Client.
*/
public Client(int port, String name) {
this.port = port;
this.name = name;
this.bloomChain = new BloomChain();
this.cachedExecutor = Executors.newCachedThreadPool();
this.singleThreadExecutor = Executors.newSingleThreadExecutor();
this.listener = createListeningSocket();
this.gson = new Gson();
startListening();
}
/**
* This method handles message sending
* If it is the first message in a block then it creates a genesis block with a hash of '0'
* Otherwise it adds a new block to the chain and sends it to the peer
*
* @param message
*/
public void sendMessage(String message) {
if (bloomChain.size() < 1) {
System.out.println("Genesis Block");
bloomChain.addBlock(new Block(message, "0"));
} else {
System.out.println("Augmented Block");
bloomChain.addBlock(new Block(message, bloomChain.get(bloomChain.size() - 1).getPreviousHash()));
}
try {
System.out.println("Sending Chain..");
this.outputStream.writeObject(gson.toJson(bloomChain));
this.outputStream.flush();
System.out.println("Chain Sent..");
try {
bloomChain = updateLocalChain(); /**error begins here */
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
}
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* This sends the chain to a background thread in order to
* mine the latest block and reveal the message
*
* @return once the mining is complete it returns the produced String
*/
private String mineMessage(BloomChain bloomChain) {
String receivedMessage = null;
Block tempBlock = bloomChain.get(bloomChain.size() - 1);
System.out.println(bloomChain.toString());
tempBlock.mineBlock(bloomChain.getDifficulty());
System.out.println(bloomChain.toString());
if (bloomChain.isValid()) {
receivedMessage = tempBlock.getData();
this.bloomChain = bloomChain;
try {
this.outputStream.writeObject(gson.toJson(this.bloomChain));
this.outputStream.flush();
} catch (IOException e) {
e.printStackTrace();
}
System.out.println(receivedMessage);
} else {
receivedMessage = "Chain Invalid";
}
return receivedMessage;
}
/**
* This method is continuously called (in the main() class)
* This listens for any incoming messages
*
* @return returns the mineMessage() result
*/
public String dataListener() {
try {
String tempChain = (String) this.inputStream.readObject();
return mineMessage(this.gson.fromJson(tempChain, BloomChain.class));
} catch (Exception e) {
//This will produce exceptions until the client has connected to a peer
//so no logic is present here
}
return null;
}
private void checkChainValidity(BloomChain tempChain) {
if(tempChain.isValid()){
System.out.println("Local Chain Updated");
System.out.println(this.bloomChain.toString());
this.bloomChain = tempChain;
}
}
public ServerSocket getListener() {
return this.listener;
}
private synchronized BloomChain updateLocalChain() throws ExecutionException, InterruptedException {
Future<BloomChain> agreedChain = this.singleThreadExecutor.submit(new Callable<BloomChain>() {
@Override
public BloomChain call() throws IOException, ClassNotFoundException {
String newChain = (String) inputStream.readObject();
return gson.fromJson(newChain, BloomChain.class);
}
});
return agreedChain.get(); /** ERROR IS THROWN HERE */
}
}
堆栈跟踪：
java.util.concurrent.ExecutionException: java.io.StreamCorruptedException: invalid type code: 00
at java.util.concurrent.FutureTask.report(FutureTask.java:122)
at java.util.concurrent.FutureTask.get(FutureTask.java:192)
at com.p2p.Client.updateLocalChain(Client.java:265)
at com.p2p.Client.sendMessage(Client.java:186)
at com.gui.ClientGUI$4.actionPerformed(ClientGUI.java:78)
at javax.swing.JTextField.fireActionPerformed(JTextField.java:508)
at javax.swing.JTextField.postActionEvent(JTextField.java:721)
at javax.swing.JTextField$NotifyAction.actionPerformed(JTextField.java:836)
at javax.swing.SwingUtilities.notifyAction(SwingUtilities.java:1663)
at javax.swing.JComponent.processKeyBinding(JComponent.java:2882)
at javax.swing.JComponent.processKeyBindings(JComponent.java:2929)
at javax.swing.JComponent.processKeyEvent(JComponent.java:2845)
at java.awt.Component.processEvent(Component.java:6310)
at java.awt.Container.processEvent(Container.java:2237)
at java.awt.Component.dispatchEventImpl(Component.java:4889)
at java.awt.Container.dispatchEventImpl(Container.java:2295)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1954)
at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:835)
at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:1103)
at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:974)
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:800)
at java.awt.Component.dispatchEventImpl(Component.java:4760)
at java.awt.Container.dispatchEventImpl(Container.java:2295)
at java.awt.Window.dispatchEventImpl(Window.java:2746)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:760)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:90)
at java.awt.EventQueue$4.run(EventQueue.java:733)
at java.awt.EventQueue$4.run(EventQueue.java:731)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:730)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:205)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
Caused by: java.io.StreamCorruptedException: invalid type code: 00
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1595)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:427)
at com.p2p.Client$1.call(Client.java:261)
at com.p2p.Client$1.call(Client.java:258)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
解决方案
不是直接答案（抱歉无法评论）如果您只是发送和接收字符串，那么BufferedReader在客户端使用，而您可以PrintWriter在StreamWriter服务器中使用。
还请分享服务器代码。也许您从服务器发送了错误的对象。
另外请检查您从服务器发送的数据的顺序是否与客户端相同/同步。
为了完整性，您可以选择纯字节流而不是对象流，或使用常见格式，如JSON/XML.
推荐阅读
- java - 使用 Jackson 反序列化时禁用标量到字符串的转换
- javascript - 如何让 Moment.js 忽略用户的时区？
- ansible - ansible根据属性合并两个列表
- c - printf 以不同的方式表现...并获取地址和值....字符串的地址和指针仅在取消引用后
- java - 如何正确设置我的平截头体投影？
- sql-server - 用第 2 列的值替换第 1 列的值
- html - 如何使背景图像更暗，而不会使同一 div 中的其他图像“变暗”？
- arrays - 如何在不更新每一帧的数组的情况下处理动画图块？
- javascript - jquery 粘性th
- javascript - 将 JQuery MultiSelect 添加到现有的 MultiSelect 对象