「javaping实现」java中mapping

博主：adminadmin 2022-12-06 23:30:08 89

今天给各位分享javaping实现的知识，其中也会对java中mapping进行解释，如果能碰巧解决你现在面临的问题，别忘了关注本站，现在开始吧！

本文目录一览：

如何用java实现，实时获取局域网内所有接入设备的IP地址

1.得到局域网网段，可由自己机器的IP来确定 （也可以手动获取主机IP-CMD-ipconfig /all）

2.根据IP类型，一次遍历局域网内IP地址

JAVA类，编译之后直接运行便可以得到局域网内所有IP,具体怎样使用你自己编写相应代码调用便可

代码如下：：

package bean;

import java.io.*;

import java.util.*;

public class Ip{

static public HashMap ping; //ping 后的结果集

public HashMap getPing(){ //用来得到ping后的结果集

return ping;

}

//当前线程的数量, 防止过多线程摧毁电脑

static int threadCount = 0;

public Ip() {

ping = new HashMap();

}

public void Ping(String ip) throws Exception{

//最多30个线程

while(threadCount30)

Thread.sleep(50);

threadCount +=1;

PingIp p = new PingIp(ip);

p.start();

}

public void PingAll() throws Exception{

//首先得到本机的IP，得到网段

InetAddress host = InetAddress.getLocalHost();

String hostAddress = host.getHostAddress();

int k=0;

k=hostAddress.lastIndexOf(".");

String ss = hostAddress.substring(0,k+1);

for(int i=1;i =255;i++){ //对所有局域网Ip

String iip=ss+i;

Ping(iip);

}

//等着所有Ping结束

while(threadCount0)

Thread.sleep(50);

}

public static void main(String[] args) throws Exception{

Ip ip= new Ip();

ip.PingAll();

java.util.Set entries = ping.entrySet();

Iterator iter=entries.iterator();

String k;

while(iter.hasNext()){

Map.Entry entry=(Map.Entry)iter.next();

String key=(String)entry.getKey();

String value=(String)entry.getValue();

if(value.equals("true"))

System.out.println(key+"--"+value);

}

}

class PingIp extends Thread{

public String ip; // IP

public PingIp(String ip){

this.ip=ip;

}

public void run(){

try{

Process p= Runtime.getRuntime().exec ("ping "+ip+ " -w 300 -n 1");

InputStreamReader ir = new InputStreamReader(p.getInputStream());

LineNumberReader input = new LineNumberReader (ir);

//读取结果行

for (int i=1 ; i 7; i++)

input.readLine();

String line= input.readLine();

if (line.length() 17 || line.substring(8,17).equals("timed out"))

ping.put(ip,"false");

else

ping.put(ip,"true");

//线程结束

threadCount -= 1;

}catch (IOException e){}

}

}

}

请问怎样用java发送ICMP包，实现ping,测量两个主机之间的延时

网上搜的

三、ICMP Ping in Java(JDK 1.5 and above)

Programatically using ICMP Ping is a great way to establish that a server is up and running. Previously you couldn't do ICMP ping (what ping command does in Linux/Unix Windows) in java without using JNI or exec calls. Here is a simple and reliable method to do ICMP pings in Java without using JNI or NIO.

String host = "172.16.0.2"

int timeOut = 3000; // I recommend 3 seconds at least

boolean status = InetAddress.getByName(host).isReachable(timeOut)

status is true if the machine is reachable by ping; false otherwise. Best effort is made to try to reach the host, but firewalls and server configuration may block requests resulting in a unreachable status while some specific ports may be accessible. A typical implementation will use ICMP ECHO REQUESTs if the privilege can be obtained, otherwise it will try to establish a TCP connection on port 7 (Echo) of the destination host.

In Linux/Unix you may have to suid the java executable to get ICMP Ping working, ECHO REQUESTs will be fine even without suid. However on Windows you can get ICMP Ping without any issues whatsoever.

四、最简单的办法，直接调用CMD

try

{

Runtime.getRuntime().exec("cmd /c start ping 127.0.0.1");

}

catch (Exception ex)

{

System.out.println(ex.getMessage());

}

ping的过程可以显示在本地的办法

import java.io.*;

public class Ping

{

public static void main(String args[])

{

String line = null;

try

{

Process pro = Runtime.getRuntime().exec("ping 127.0.0.1 ");

BufferedReader buf = new BufferedReader(new InputStreamReader(pro.getInputStream()));

while ((line = buf.readLine()) != null)

System.out.println(line);

}

catch (Exception ex)

{

System.out.println(ex.getMessage());

}

}

}

五、模拟PING

利用InetAddress的isReachable方法可以实现ping的功能，里面参数设定超时时间，返回结果表示是否连上

try {

InetAddress address = InetAddress.getByName("192.168.0.113");

System.out.println(address.isReachable(5000));

} catch (UnknownHostException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

java exce ping命令

String line = null;

while((line = br.readLine()) != null){

    System.out.println(line);

}

用java写个quick ping

简单点的直接使用Runtime的exec来搞定，如下：

public static void main( String[] args )

{

    StringBuffer buf = new StringBuffer();

    String s = "";

    Process process;

    try

    {

        process = Runtime.getRuntime().exec( "cmd /c " + "ping 127.0.0.1" );

        BufferedReader br = new BufferedReader( new InputStreamReader(

        process.getInputStream() ) );

        while ( ( s = br.readLine() ) != null )

        {

            buf.append( s + "\r\n" );

        }

        process.waitFor();

        System.out.println( buf );

    } catch ( Exception ex )

    {

        ex.printStackTrace();

    }

}

复杂点的，可以查看Oracle的官网文档，实现了完整的ping:(粘贴下面的路径到浏览器地址栏，加上http://)

docs.oracle.com/javase/1.5.0/docs/guide/nio/example/Ping.java

如何用Java实现Ping

你应该看看api process 返回的是流,按照输出流的方法操作即可.公司上不去外网,有代理才行,所以没有ping 百度,ping的本机.

import java.io.BufferedReader;

import java.io.InputStreamReader;

public class CallCmd {

public static void main(String[] args) {

BufferedReader br = null;

try {

Process p = Runtime.getRuntime().exec("ping 127.0.0.1");

br = new BufferedReader(new InputStreamReader(p.getInputStream()));

String line = null;

StringBuilder sb=new StringBuilder();

while ((line = br.readLine()) != null) {

sb.append(line+"\n");

}

System.out.println(sb.toString());

} catch (Exception e) {

e.printStackTrace();

} finally {

if (br != null) {

try {

br.close();

} catch (Exception e) {

e.printStackTrace();

}

}

}

}

}

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发布于：2022-12-06，除非注明，否则均为首码项目网原创文章，转载请注明出处。

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