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我正在编写一个大型Java应用程序的服务器部分，用于通过TCP/IP使用Java套接字与客户端进行通信。客户端（用PHP编写）连接到服务器，以XML格式发送查询，然后服务器发回响应。查询响应可以在单个连接中重复多次。不能通过Java套接字发送消息而不关闭它
服务器端很简单。它应该允许多个客户端连接，所以有一个线程监听并为每个接受的连接产生一个会话。会话包含一个对象，该对象包含两个用于传输和接收的LinkedBlockingQueues，两个用于使用这些队列传输和接收消息的线程以及一个处理线程。
问题是，只有在套接字关闭后，任何消息才会被实际传输。响应消息没有问题地进入消息队列和PrintStream.println（）方法，但wireshark仅在客户端关闭连接时报告传输。使用启用自动刷新或使用flush（）创建PrintStream不起作用。关闭服务器端的套接字也不起作用，服务器仍然运行并接收消息。
此外，当前在客户端接收服务器端查询的实现工作正常，同样来自本地Linux虚拟机echo -e "test" | socat - TCP4:192.168.37.1:1337，但是当我telnet到服务器并尝试发送一些东西，然后服务器没有收到任何东西，直到我关闭telnet客户端，同样的问题，如上所述。
相关的服务器代码（整个应用程序太大粘贴的一切，我有很多其他人的代码工作）：
package Logic.XMLInterfaceForClient;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.net.Socket;
import java.util.HashSet;
import java.util.concurrent.LinkedBlockingQueue;
import Data.Config;
import Logic.Log;
public class ClientSession {
/**
* @author McMonster
*
*/
public class MessageTransmitter extends Thread {
private final Socket socket;
private final ClientSession parent;
private PrintStream out;
/**
* @param socket
* @param parent
*/
public MessageTransmitter(Socket socket, ClientSession parent) {
this.socket = socket;
this.parent = parent;
}
/*
* (non-Javadoc)
*
* @see java.lang.Runnable#run()
*/
@Override
public void run() {
try {
out = new PrintStream(socket.getOutputStream(), true);
while (!socket.isClosed()) {
try {
String msg = parent.transmit.take();
// System.out.println(msg);
out.println(msg);
out.flush();
}
catch(InterruptedException e) {
// INFO: purposefully left empty to suppress spurious
// wakeups
}
}
}
catch(IOException e) {
parent.fail(e);
}
}
}
/**
* @author McMonster
*
*/
public class MessageReceiver extends Thread {
private final Socket socket;
private final ClientSession parent;
private BufferedReader in;
/**
* @param socket
* @param parent
*/
public MessageReceiver(Socket socket, ClientSession parent) {
this.socket = socket;
this.parent = parent;
}
/*
* (non-Javadoc)
*
* @see java.lang.Runnable#run()
*/
@Override
public void run() {
try {
in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
while (!socket.isClosed()) {
String message = "";
String line;
while ((line = in.readLine()) != null) {
message = message + line + "\n";
}
if(message != "") {
parent.receive.offer(message.toString());
}
}
}
catch(IOException e) {
parent.fail(e);
}
}
}
public final LinkedBlockingQueue<String> transmit = new LinkedBlockingQueue<>();
public final LinkedBlockingQueue<String> receive = new LinkedBlockingQueue<>();
private final XMLQueryHandler xqh;
private final Socket socket;
private String user = null;
private HashSet<String> privileges = null;
/**
* @param socket
* @param config
* @throws IOException
* @throws IllegalArgumentException
*/
public ClientSession(Socket socket, Config config)
throws IOException,
IllegalArgumentException {
// to avoid client session without the client
if(socket == null) throw new IllegalArgumentException("Socket can't be null.");
this.socket = socket;
// we do not need to keep track of the two following threads since I/O
// operations are currently blocking, closing the sockets will cause
// them to shut down
new MessageReceiver(socket, this).start();
new MessageTransmitter(socket, this).start();
xqh = new XMLQueryHandler(config, this);
xqh.start();
}
public void triggerTopologyRefresh() {
xqh.setRefresh(true);
}
public void closeSession() {
try {
xqh.setFinished(true);
socket.close();
}
catch(IOException e) {
e.printStackTrace();
Log.write(e.getMessage());
}
}
/**
* Used for reporting failures in any of the session processing threads.
* Handles logging of what happened and shuts down all session threads.
*
* @param t
* cause of the failure
*/
synchronized void fail(Throwable t) {
t.printStackTrace();
Log.write(t.getMessage());
closeSession();
}
synchronized boolean userLogin(String login, HashSet<String> privileges) {
boolean success = false;
if(!privileges.isEmpty()) {
user = login;
this.privileges = privileges;
success = true;
}
return success;
}
public synchronized boolean isLoggedIn() {
return user != null;
}
/**
* @return the privileges
*/
public HashSet<String> getPrivileges() {
return privileges;
}
}
你说得对，我想这可能是所有这些都无法正常工作的原因。我将编写一些可接受的XML消息检测，看看它是否修复它。 – McMonster
我已经在读取一行并检查null的地方添加了XML验证，现在它可以正常工作。问题是关闭连接后才收到查询，因此无法在同一连接中发送响应。感谢您的帮助。 – McMonster