/*
* Checks if file exists, if it doesn't return null. If it does
* reads each line from the file and returns an Array of Strings,
* each index being 1 line from the file.
*/
public static String[] readLinesFromFile(File filename) throws IOException {
BufferedReader reader = null;
// TODO: Convert to stringbuilder
String lines = "";
String temp = "";
if (!filename.exists()) {
return null;
}
try {
reader = new BufferedReader(new FileReader(filename));
temp = reader.readLine();
while (temp != null) {
lines += temp + "\n";
temp = reader.readLine();
}
} finally {
reader.close();
}
return lines.split("\n");
}
public static String streamToString(InputStream is) throws IOException {
if (is != null) {
StringBuilder sb = new StringBuilder();
String line;
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(is, "UTF-8"));
while ((line = reader.readLine()) != null) {
sb.append(line).append("\n");
}
} finally {
is.close();
}
return sb.toString();
} else {
return "";
}
}
public void receiveTarget() {
// 接收用户输入的地址，向targets队列中加入任务
try {
BufferedReader localReader = new BufferedReader(new InputStreamReader(System.in));
String msg = null;
while ((msg = localReader.readLine()) != null) {
if (!msg.equals("bye")) {
Target target = new Target(msg);
addTarget(target);
} else {
shutdown = true;
selector.wakeup();
break;
}
}
} catch (IOException e) {
e.printStackTrace();
}
}
public static void readCommand() {
try {
if (!reader.ready()) {
return;
}
StringTokenizer tokens = new StringTokenizer(reader.readLine());
if (tokens.hasMoreTokens()) {
switch (tokens.nextToken()) {
case "/listen":
listen(tokens);
break;
case "/stop":
stop();
break;
case "/list":
if (port[0] == -1) {
System.err.println("Error: start listening before");
}
for (Entry<String, SocketChannel> client : clients.entrySet()) {
System.out.println(client.getKey());
}
if (clients.entrySet().isEmpty()) {
System.out.println("list: no clients online");
}
break;
case "/send":
if (tokens.hasMoreTokens()) {
String name = tokens.nextToken();
if (clients.containsKey(name)) {
if (tokens.hasMoreTokens()) {
sendMessage(
clients.get(name),
MessageUtils.message("<server>", getMessageFromTokens(tokens)));
} else {
System.err.println("send: message is empty");
}
} else {
System.err.println("send: no such client");
}
} else {
System.err.println("send: no client name");
}
break;
case "/sendall":
if (tokens.hasMoreTokens()) {
notifyAllClients(getMessageFromTokens(tokens));
} else {
System.err.println("sendall: message is empty");
}
break;
case "/kill":
kill(tokens);
break;
case "/exit":
if (port[0] != -1) {
stop();
}
Utils.tryClose(selector);
System.exit(0);
break;
default:
System.err.print("Error: unknown command");
break;
}
} else {
System.err.println("Error: empty input");
}
} catch (Exception expt) {
Utils.printErrorAndExit(expt.getMessage());
}
}