Java版通过单个域名Ping Ip
public class PingOne {
static int DAYTIME_PORT = 13;
static int port = DAYTIME_PORT;
static class Target {
InetSocketAddress address;
SocketChannel channel;
Exception failure;
long connectStart;
long connectFinish = 0;
boolean shown =
false
;
Target(String host) {
try
{
address =
new
InetSocketAddress(InetAddress.getByName(host),
port);
}
catch
(IOException x) {
failure = x;
}
}
void show() {
String result;
if
(connectFinish != 0)
result = Long.toString(connectFinish - connectStart) +
"ms"
;
else
if
(failure !=
null
)
result = failure.toString();
else
result =
"Timed out"
;
System.out.println(address +
" : "
+ result);
shown =
true
;
}
}
static class Printer extends Thread {
LinkedList pending =
new
LinkedList();
Printer() {
setName(
"Printer"
);
setDaemon(
true
);
}
void add(Target t) {
synchronized (pending) {
pending.add(t);
pending.notify();
}
}
public void run() {
try
{
for
(;;) {
Target t =
null
;
synchronized (pending) {
while
(pending.size() == 0)
pending.wait();
t = (Target) pending.removeFirst();
}
t.show();
}
}
catch
(InterruptedException x) {
return
;
}
}
}
static class Connector extends Thread {
Selector sel;
Printer printer;
LinkedList pending =
new
LinkedList();
Connector(Printer pr) throws IOException {
printer = pr;
sel = Selector.open();
setName(
"Connector"
);
}
void add(Target t) {
SocketChannel sc =
null
;
try
{
sc = SocketChannel.open();
sc.configureBlocking(
false
);
boolean connected = sc.connect(t.address);
t.channel = sc;
t.connectStart = System.currentTimeMillis();
if
(connected) {
t.connectFinish = t.connectStart;
sc.close();
printer.add(t);
}
else
{
synchronized (pending) {
pending.add(t);
}
sel.wakeup();
}
}
catch
(IOException x) {
if
(sc !=
null
) {
try
{
sc.close();
}
catch
(IOException xx) {
}
}
t.failure = x;
printer.add(t);
}
}
void processPendingTargets() throws IOException {
synchronized (pending) {
while
(pending.size() > 0) {
Target t = (Target) pending.removeFirst();
try
{
t.channel.register(sel, SelectionKey.OP_CONNECT, t);
}
catch
(IOException x) {
t.channel.close();
t.failure = x;
printer.add(t);
}
}
}
}
void processSelectedKeys() throws IOException {
for
(Iterator i = sel.selectedKeys().iterator(); i.hasNext();) {
SelectionKey sk = (SelectionKey) i.next();
i.remove();
Target t = (Target) sk.attachment();
SocketChannel sc = (SocketChannel) sk.channel();
try
{
if
(sc.finishConnect()) {
sk.cancel();
t.connectFinish = System.currentTimeMillis();
sc.close();
printer.add(t);
}
}
catch
(IOException x) {
sc.close();
t.failure = x;
printer.add(t);
}
}
}
volatile boolean shutdown =
false
;
void shutdown() {
shutdown =
true
;
sel.wakeup();
}
public void run() {
for
(;;) {
try
{
int n = sel.select();
if
(n > 0)
processSelectedKeys();
processPendingTargets();
if
(shutdown) {
sel.close();
return
;
}
}
catch
(IOException x) {
x.printStackTrace();
}
}
}
}
public static void main(String[] args) throws InterruptedException,
IOException {
args =
new
String[] {
"80"
,
"www.depingchem.com"
};
if
(args.length < 1) {
System.err.println(
"Usage: java Ping [port] host..."
);
return
;
}
int firstArg = 0;
if
(Pattern.matches(
"[0-9]+"
, args[0])) {
port = Integer.parseInt(args[0]);
firstArg = 1;
}
Printer printer =
new
Printer();
printer.start();
Connector connector =
new
Connector(printer);
connector.start();
LinkedList targets =
new
LinkedList();
for
(int i = firstArg; i < args.length; i++) {
Target t =
new
Target(args[i]);
targets.add(t);
connector.add(t);
}
Thread.sleep(2000);
connector.shutdown();
connector.join();
for
(Iterator i = targets.iterator(); i.hasNext();) {
Target t = (Target) i.next();
if
(!t.shown)
t.show();
}
}
}