[英]Error while using InputStreamReader with Java
我尝试将int值从客户端发送到服务器。 这是我在下面使用的客户端代码:
_port = 8071;
_socket = new Socket("localhost", _port);
Random rand = new Random();
int n = rand.nextInt(50) + 1;
DataOutputStream dos = new DataOutputStream(_socket.getOutputStream());
dos.writeInt(n);
dos.flush();
服务器代码
try {
input = new BufferedReader(new InputStreamReader(socket.getInputStream()));
ObjectInputStream in = null;
in = new ObjectInputStream(socket.getInputStream());
int ClientNumber= in.readInt();
System.out.println(ClientNumber);
}
但我收到无效的流头错误。
无效的流标头:java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:781)处0000002B,java.io.ObjectInputStream。(ObjectInputStream.java:278)处ServiceRequest.run(ServiceRequest.java:24)处java.util。并发java.util.concurrent.FutureTask $ Sync.innerRun(FutureTask.java:303)处的java.util.concurrent.FutureTask.run(FutureTask.java:138)处的Executors $ RunnableAdapter.call(Executors.java:439)在java.util.concurrent.ThreadPoolExecutor $ Worker.runTask(ThreadPoolExecutor.java:895)在java.util.concurrent.ThreadPoolExecutor $ Worker.run(ThreadPoolExecutor.java:918)在java.lang.Thread.run(Thread.java) :680)
有谁知道是什么原因引起的错误? 我的代码设置不正确吗?
您正在使用DataOutputStream
编写,并使用ObjectInputStream
读取 。 您应该改用DataInputStream
:
// Note declaration and assignment in a single statement. There's no point in
// making it null first.
DataInputStream in = new DataInputStream(socket.getInputStream());
// Note use of camelCase for variable name
int clientNumber = in.readInt();
您还应该在这里摆脱input
:您不是从中读取数据,而且看起来像是二进制数据流,因此将其视为文本是不合适的。
哦,您应该在finally
块中关闭输入流。
尝试像这样改变它
try {
// input = new BufferedReader(new InputStreamReader(socket.getInputStream()));
DataInputStream in = new DataInputStream(socket.getInputStream());
int clientNumber= in.readInt();
System.out.println(clientNumber);
}
它应该工作。 ObjectInputStream只能读取由ObjectOuputStream发送的流,它以魔术数字(标头) 0xACED
,请参见http://docs.oracle.com/javase/6/docs/platform/serialization/spec/protocol.html
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