Java 连接到服务器,发送字符串并接收对象-BufferedReader not';准备好了吗;?
服务器:Java 连接到服务器,发送字符串并接收对象-BufferedReader not';准备好了吗;?,java,networking,Java,Networking,服务器: public Server() { gui = new GUI(); try { socket = new ServerSocket(2000); while (true) { Socket client = socket.accept(); gui.append("Client accepted."); if (inetAddrFound(client.ge
public Server() {
gui = new GUI();
try {
socket = new ServerSocket(2000);
while (true) {
Socket client = socket.accept();
gui.append("Client accepted.");
if (inetAddrFound(client.getInetAddress().getHostName())) {
Thread thread = new Thread(new IncomingClient(client));
threads.put(client, thread);
thread.start();
}
}
} catch (IOException e) {
e.printStackTrace();
}
}
public class IncomingClient implements Runnable {
BufferedReader reader;
Socket sock;
public IncomingClient(Socket socket) {
gui.append("Incoming socket class instantiated.");
try {
this.sock = socket;
InputStreamReader streamReader = new InputStreamReader(sock.getInputStream());
reader = new BufferedReader(streamReader);
} catch (Exception e) {
for (StackTraceElement s : e.getStackTrace()) {
gui.append(s.toString());
}
}
}
@Override
public void run() {
String message;
try {
while (true) {
gui.append("Trying to see if reader.readLine == null");
if (!reader.ready()) {
System.out.println("Reader is not ready.");
continue;
}
if ((message = reader.readLine()) != null && !Thread.currentThread().isInterrupted()) {
System.out.println("Reader is not null.");
System.out.println("Message = " + message);
gui.append(message);
if (idFound(message)) {
ObjectOutputStream stream = (ObjectOutputStream) sock.getOutputStream();
stream.writeObject(spooker);
stream.close();
threads.get(sock).interrupt();
threads.remove(sock);
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
客户:
private void connect() {
try {
socket = new Socket(decode(ADDR), Integer.parseInt(decode(PORT)));
ois = new ObjectInputStream(socket.getInputStream());
writer = new PrintWriter(socket.getOutputStream());
writer.println(String.valueOf(encode(getMotherboardSN())));
writer.flush;
writer.close;
} catch (Exception e) {
e.printStackTrace();
}
}
public class IncomingSpookerObject implements Runnable {
@Override
public void run() {
SpookerObject object;
try {
while ((object = (SpookerObject) ois.readObject()) != null && !Thread.currentThread().isInterrupted()) {
spooker = (SpookerObject) ois.readObject();
thread.interrupt();
System.out.println(spooker.getX());
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
我的目标是连接到服务器,将用户cpu id(每台计算机的唯一标识符)发送到服务器(cpu id是一个字符串),服务器将读取cpu id,如果用户已注册(例如,如果他们的cpu id在数据库中),则将向他们发送一个对象(Spooker对象)
spooker对象是一个测试对象,它只保存int x=4和一个返回x,getX()的方法
我之所以这么做是为了防止软件被泄露。将来,spooker对象将包含启动客户端软件的信息(例如GUI大小、GUI标题、字符串值等)。这是为了使软件在连接到服务器并检索特定信息时更难泄漏
我希望我已经尽可能清楚了
阿尔奇
编辑-更新的服务器对象
服务器输出-
客户接受了。
已实例化传入套接字类。
正在尝试查看reader.readLine==null
读者还没准备好。
读者还没准备好。
读者还没准备好。
读者还没准备好。
读者还没准备好。
读者还没准备好
它不断地打印出来——为什么读者从来没有准备好
编辑;
增加:
writer.println writer.flush();writer.close()
服务器正在尝试读取一行永不结束的内容。在connect方法中,应该关闭输出流 更新 下面是一个有效的例子。事实上,不能关闭输出流,因为它会关闭底层套接字 服务器:
public class Server {
private static final Logger LOG = Logger.getLogger(Server.class.getName());
public static void main(String[] args) {
int port = args.length > 0 ? Integer.parseInt(args[0]) : 2000;
try (ServerSocket socket = new ServerSocket(port)) {
while (true) {
Socket client = socket.accept();
System.out.println("Client accepted.");
Thread thread = new Thread(new IncomingClient(client));
thread.start();
}
} catch (IOException e) {
e.printStackTrace();
}
}
static class IncomingClient implements Runnable {
private final Socket sock;
private final SpookerObject spooker = new SpookerObject();
public IncomingClient(Socket socket) {
System.out.println("Incoming socket class instantiated.");
this.sock = socket;
}
@Override
public void run() {
try (InputStream istream = sock.getInputStream();
Reader reader = new InputStreamReader(istream);
BufferedReader in = new BufferedReader(reader);
OutputStream ostream = sock.getOutputStream();
ObjectOutputStream out = new ObjectOutputStream(ostream)) {
String message = in.readLine();
if (message != null && idFound(message)) {
while (!Thread.currentThread().isInterrupted()
&& sock.isConnected()) {
System.out.println("Reader is not null.");
System.out.println("Message = " + message);
out.writeObject(spooker);
}
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
sock.close();
} catch (IOException ex) {
LOG.log(Level.SEVERE, null, ex);
}
}
}
private boolean idFound(String id) {
return "abcdef".equals(id);
}
}
}
客户:
public class Client implements Closeable {
private static final Logger LOG = Logger.getLogger(Client.class.getName());
private final Socket socket;
private final ObjectInputStream ois;
public static void main(String[] args) {
try {
InetAddress server = InetAddress.getByName(args[0]);
int port = Integer.parseInt(args[1]);
String cpuId = args[2];
try (Client client = new Client(server, port, cpuId)) {
for (int i = 0; i < 3; ++i) {
System.out.println(client.readSpooker());
}
}
} catch (IOException ex) {
LOG.log(Level.SEVERE, null, ex);
}
}
public Client(InetAddress address, int port, String cpuId)
throws IOException {
boolean ok = false;
socket = new Socket(address, port);
try {
OutputStream stream = socket.getOutputStream();
Writer writer = new OutputStreamWriter(stream, "UTF-8");
PrintWriter out = new PrintWriter(writer);
out.println(cpuId);
out.flush();
ois = new ObjectInputStream(socket.getInputStream());
ok = true;
} finally {
if (!ok) {
socket.close();
}
}
}
@Override
public void close() throws IOException {
try {
if (ois != null) {
ois.close();
}
} finally {
socket.close();
}
}
public SpookerObject readSpooker() throws IOException {
try {
return (SpookerObject)ois.readObject();
} catch (ClassNotFoundException ex) {
LOG.log(Level.SEVERE, null, ex);
throw new IOException(ex.getMessage());
}
}
}
公共类客户端实现可关闭{
私有静态最终记录器LOG=Logger.getLogger(Client.class.getName());
专用终端插座;
私人最终目标输出ois;
公共静态void main(字符串[]args){
试一试{
InetAddress服务器=InetAddress.getByName(args[0]);
int port=Integer.parseInt(args[1]);
字符串cpuId=args[2];
try(客户机=新客户机(服务器、端口、cpuId)){
对于(int i=0;i<3;++i){
System.out.println(client.readSpooker());
}
}
}捕获(IOEX异常){
LOG.LOG(Level.SEVERE,null,ex);
}
}
公共客户端(InetAddress地址、int端口、字符串cpuId)
抛出IOException{
布尔ok=false;
套接字=新套接字(地址、端口);
试一试{
OutputStream=socket.getOutputStream();
Writer Writer=新的输出流Writer(流,“UTF-8”);
PrintWriter out=新的PrintWriter(writer);
out.println(cpuId);
out.flush();
ois=newObjectInputStream(socket.getInputStream());
ok=正确;
}最后{
如果(!ok){
socket.close();
}
}
}
@凌驾
public void close()引发IOException{
试一试{
如果(ois!=null){
ois.close();
}
}最后{
socket.close();
}
}
public SpookerObject readSpooker()引发IOException{
试一试{
返回(SpookerObject)ois.readObject();
}捕获(ClassNotFoundException ex){
LOG.LOG(Level.SEVERE,null,ex);
抛出新IOException(例如getMessage());
}
}
}
您没有发送带有客户端数据的CR,因此就服务器而言,还没有完整的行可读取。尝试将writer.write()
更改为writer.println()
只需删除ready()
测试,然后继续。这没有意义。您只需旋转循环,直到至少有一个字节可以在不阻塞的情况下读取,然后很可能会在readLine()
中阻塞,因为它会阻塞,直到可以读取整行
您还需要决定是发送行还是对象。不能通过同一个插座同时执行这两项操作 我设法弄明白了。我不得不用,
object=ois.readObject();
对象实例
不是
ois.readObject instanceOf
等等
很抱歉回答得很简短,很忙。实际问题是什么?你有错误吗?您调试过吗?@SteveSmith客户端似乎正在连接到服务器,但此代码(message=reader.readLine())!=null
返回null或根本不运行-因为gui.append(消息)
不运行。刚刚调试过。它一直运行,然后reader.readLine为null。可能是服务器试图在客户端发送数据之前读取数据。尝试让服务器等待@SteveSmith添加了reader.ready()
,但输出仍然是一样的。我不明白IncomingSpookerObject类的目的是为了阻止发送/接收更多的数据,比如对象数据。好的,至少做一次println,因为@SteveSmith写了这个问题仍然没有解决。bufferedreader从未就绪。确定,然后删除对reader.ready()的测试。它的目的是什么?`Socket.isConnected()`在对等机断开连接时不会神奇地变成false。不能在同一个套接字上混合使用行和对象I/O。你声称这段代码是有效的,这很难让人相信。改变了-但它仍然看不懂。BufferedReader似乎从未准备好。他正在发送一个带有客户端数据的行终止符。他正在调用println()
,这正是他所做的。他现在正在调用,但我写答案时他没有。我不同意:服务器从输入流读取行,并在输出流上写入对象。这没什么错。我正在努力理解这是如何解决问题的instanceof
没有在任何地方使用?@SteveSmith在更新版本it i中