我必须创建一个客户端,该客户端从套接字获取请求,并将其发送到我们的telnet旧式服务器,并返回服务器响应。一直很好,直到我们最近才意识到我发送的某些命令被截断为1955个字符。一切设置的方式是,我向服务器发送了1行命令,然后又发送了1行响应。我想不通一种方法,可以通过TelnetClient通过DataOutputStream发送更长的命令。我做错了吗?还是仅仅是这些对象之一的限制?
public void connect() {
try {
tc = new TelnetClient();
TerminalTypeOptionHandler ttopt = new TerminalTypeOptionHandler("VT100", false, false, true, false);
EchoOptionHandler echoopt = new EchoOptionHandler(true, false, true, false);
SuppressGAOptionHandler gaopt = new SuppressGAOptionHandler(true, true, true, true);
try {
tc.addOptionHandler(ttopt);
tc.addOptionHandler(echoopt);
tc.addOptionHandler(gaopt);
} catch (InvalidTelnetOptionException e) {
ServerConsole.log(e.getMessage());
}
tc.connect("192.168.1.8", 2010);
in = new DataInputStream(tc.getInputStream());
out = new DataOutputStream(tc.getOutputStream());
login();
} catch (IOException ex) {
ServerConsole.log(ex.getMessage());
}
}
//This is a watered down version of my write method just to show the basic idea of whats happening
public String write(String command) {
String finalCommand = command+"\n";
byte[] comm = finalCommand.getBytes();
out.write(comm);
out.flush();
response = in.readLine();
response = in.readLine();
return response;
}
经过一番修补后,我认为这根本不是客户端问题。我拿了您的客户端代码,并根据它编写了一个测试客户端。然后,我写了一个(非常)基本的示例服务器,它打印出传入的消息并返回一个ACK。
即使将请求大小提高到100k也不会导致来自客户端的消息被截断。您可能需要仔细查看正在联系的服务器如何处理传入数据。
public class TelnetClientTest {
public static String LOCALHOST = "127.0.0.1";
public static int PORT = 5003;
public static void main(String[] args) throws Exception {
TelnetClient tc = new TelnetClient();
TerminalTypeOptionHandler ttopt = new TerminalTypeOptionHandler("VT100", false, false, true, false);
EchoOptionHandler echoopt = new EchoOptionHandler(true, false, true, false);
SuppressGAOptionHandler gaopt = new SuppressGAOptionHandler(true, true, true, true);
try {
tc.addOptionHandler(ttopt);
tc.addOptionHandler(echoopt);
tc.addOptionHandler(gaopt);
} catch (InvalidTelnetOptionException e) {
e.printStackTrace();
}
tc.connect(LOCALHOST, PORT);
DataInputStream in = new DataInputStream(tc.getInputStream());
DataOutputStream out = new DataOutputStream(tc.getOutputStream());
StringBuilder sb = new StringBuilder();
for (int i=0; i<1000; i++) {
sb.append("0123456789");
}
sb.append("\n");
out.write(sb.toString().getBytes());
out.flush();
System.out.println(in.readLine());
tc.disconnect();
}
}
public class ServerSocketExample {
private static ServerSocket server;
private static int PORT = 5003;
public static void main(String[] args) throws Exception {
server = new ServerSocket(PORT);
while (true) {
System.out.println("Waiting for clients...");
Socket s = server.accept();
System.out.println("Client connected: " + s.getLocalAddress().getHostName());
BufferedReader reader = new BufferedReader(new InputStreamReader(s.getInputStream()));
String request = reader.readLine();
System.out.println("Client says ("+request.length()+"): " + request);
System.out.println("Sending ACK response\n");
BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));
writer.write("ACK\n");
writer.flush();
}
}
}
我不知道这些对象,但是为什么不在消息的开头放置一个字符,它表示这是否是消息的结尾。因为发送巨大的字符串看起来不太安全。
示例:字符“ E”表示END,字符“ N”表示NotEnded。
因此,您的客户端可以继续接收该消息,并在不接收带有字符“ E”的消息时将它们串联成一个大字符串。
示例:正在接收...“ NTheWorld ...”创建一个字符串“ strMessage”;正在接收...“ NBurnYesterday ...”将receiveMessage与strMessage连接;正在接收...“ NTodayApple ...”将receiveMessage与strMessage连接;正在接收...“ ETheEnd”字符串完成,我执行下一个操作。
(抱歉,拼写错误)