Java套接字EOFException
Java套接字EOFException
提问于 2018-06-03 21:29:50
我使用RMI和套接字在客户机集之间传输文件。问题是，当运行下面的代码时，有时我会在客户端得到这样的异常：
java.io.EOFException
at java.io.ObjectInputStream$PeekInputStream.readFully(ObjectInputStream.java:2671)
at java.io.ObjectInputStream$BlockDataInputStream.readShort(ObjectInputStream.java:3146)
at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:858)
at java.io.ObjectInputStream.<init>(ObjectInputStream.java:354)
at javafxcyberwind.serverSocket.run(serverSocket.java:38)
at java.lang.Thread.run(Thread.java:748)这是我的代码示例，异常在注释行中：
客户端：
Server_MethodsPEER S = (Server_MethodsPEER) Naming.lookup("rmi://" + ip + ":" + port + "/" + email);
Server_Methods R = S.peer();
R.uploadToServer(fileName);
Socket s = new Socket(ip, R.getServerSocketPort());
File fres = new File(crep + fileName);
FileInputStream inf = new FileInputStream(fres);
ObjectOutputStream out = new ObjectOutputStream(s.getOutputStream());
byte buf[] = new byte[1024];
int nn;
while ((nn = inf.read(buf)) != -1) {
out.write(buf, 0, nn);
}
out.close();
inf.close();
s.close();
fres.delete();服务器：
public class serverSocket implements Runnable {
private final ServerSocket socketserver;
private Socket socket;
private final String ff;
private final String rp;
public serverSocket(ServerSocket s, String file, String rep) {
socketserver = s;
ff = file;
rp = rep;
}
@Override
public void run() {
try {
socket = socketserver.accept();
ObjectInputStream in = new ObjectInputStream(socket.getInputStream());//EOFException here
FileOutputStream out = new FileOutputStream(new File(rp + ff));
byte buf[] = new byte[1024];
int n;
while ((n = in.read(buf)) != -1) {
out.write(buf, 0, n);
}
in.close();
out.close();
socket.close();
socketserver.close();
} catch (IOException e) {
System.err.println("socket err");
}
}
}
//ServerIMPL
ServerSocket sv;
public void uploadToServer(String fileName) throws RemoteException {
try {
sv = new ServerSocket(0);
} catch (IOException ex) {
Logger.getLogger(Cloud_ServeurIMPL.class.getName()).log(Level.SEVERE, null, ex);
}
Thread t = new Thread(new serverSocket(sv, file, crep));
t.start();
Client3_MethodsPEER M = (Client3_MethodsPEER) Naming.lookup("rmi://" + ip + ":" + port + "/" + email);
Client3_Methods U = M.peer();
U.uploadToServer(fileName);
Socket s = new Socket(ip, U.getServerSocketPort());
File fres = new File(crep + fileName);
FileInputStream inf = new FileInputStream(fres);
ObjectOutputStream out = new ObjectOutputStream(s.getOutputStream());
byte buf[] = new byte[1024];
int nn;
while ((nn = inf.read(buf)) != -1) {
out.write(buf, 0, nn);
}
out.close();
inf.close();
s.close();
fres.delete();
U.operation();//FileNotFoundException here (use the received files as arguments)
}一切似乎都很好。为什么会发生这种情况，以及如何解决？
回答 1
Stack Overflow用户
发布于 2018-06-06 08:08:58
FileNotFoundException有两层含义：
- On input，找不到文件，由于权限等原因无法打开。
- On output，找不到目标目录，由于权限等原因无法写入。
例如，如果您发送的文件名包含服务器上不存在的目录，您将从new FileOutputStream获取FileNotFoundException。
你的问题中没有足够的(即任何)信息来说明这一点。
但是：
- 为此您不需要对象流，甚至不需要数据输入/输出流。您只使用了基本的
read()和write()方法，所以您也可以只使用套接字streams，directly. - You应该使用大于1024字节的缓冲区，比如8192或其倍数。
- 您可以通过我对just的回答中给出的技术，为每个连接发送多个文件
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/50666927
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