如何写一个简单的ping程序

用system函数简单调用ping命令：

#include "stdio.h"

void main()

{

char ip[15]

char command[50]

// printf("enter IP please: ")

scanf("%s",&ip[0])//输入要ping的ip

sprintf(command,"ping %s",ip)

system(command)

exit(0)

}

jpcap你要自己下好相应的包和配置，不知道的就在网上搜吧··

import java.net.InetAddress

import java.util.ArrayList

import java.util.GregorianCalendar

import java.util.List

import jpcap.JpcapCaptor

import jpcap.JpcapSender

import jpcap.NetworkInterface

import jpcap.packet.EthernetPacket

import jpcap.packet.ICMPPacket

import jpcap.packet.IPPacket

public class JPing {

private NetworkInterface[] devices = JpcapCaptor.getDeviceList()

private JpcapSender sender

private JpcapCaptor jpcap

private ICMPPacket icmpPacket

private List<String>listResult = new ArrayList<String>()

/**

* 组织ICMP报文发送，并开启线程接收报文

* @param ip

*/

public void ping(String ip) {

try {

jpcap = JpcapCaptor.openDevice(devices[0], 200, false, 20)

sender = jpcap.getJpcapSenderInstance()

jpcap.setFilter("icmp", true)// 过滤器，只接受ICMP报文

icmpPacket = new ICMPPacket()

icmpPacket.type = ICMPPacket.ICMP_ECHO// 发送回显请求报文

icmpPacket.setIPv4Parameter(0, false, false, false, 0, false,

false, false, 0, 1010101, 100, IPPacket.IPPROTO_ICMP,

devices[0].addresses[1].address, InetAddress.getByName(ip))

// 随意的32bytes数据

icmpPacket.data = "abcdefghijklmnopqrstuvwxyzabcdef".getBytes()

EthernetPacket ethernetPacket = new EthernetPacket()

ethernetPacket.frametype = EthernetPacket.ETHERTYPE_IP

ethernetPacket.src_mac = devices[0].mac_address

// 广播地址

ethernetPacket.dst_mac = new byte[] { (byte) 0xff, (byte) 0xff,

(byte) 0xff, (byte) 0xff, (byte) 0xff, (byte) 0xff }

icmpPacket.datalink = ethernetPacket

listResult.add("Pinging " + icmpPacket.dst_ip + " with "

+ icmpPacket.data.length + " bytes of data: ")

startCapThread(jpcap)

for (int i = 0i <5i++) {

icmpPacket.sec = 0

//icmpPacket.usec = System.currentTimeMillis()

icmpPacket.usec = new GregorianCalendar().getTimeInMillis()// 记录发送时间

icmpPacket.seq = (short) (1000 + i)

icmpPacket.id = (short) (999 + i)

sender.sendPacket(icmpPacket)

try {

Thread.sleep(1000)

} catch (Exception e) {

e.printStackTrace()

}

}

} catch (Exception e) {

e.printStackTrace()

}

}

/**

* 接收ICMP报文

* @param jpcap

*/

public void getIcmpPacket(JpcapCaptor jpcapCaptor) {

try {

while (true) {

long tmp = 0

String tmpStr = null

ICMPPacket rp

rp = (ICMPPacket) jpcapCaptor.getPacket()

if ((rp != null) &&(rp.seq - rp.id == 1)

&&(rp.type == ICMPPacket.ICMP_ECHOREPLY)) {// 若是ICMP回应报文，则列出。。。

tmp = (rp.sec * 1000 + rp.usec / 1000 - icmpPacket.sec

* 1000 - icmpPacket.usec)// 计算发送与接受的时间差

if (tmp <= 0)

tmpStr = " <1 ms "

else

tmpStr = "= " + tmp + " ms "

System.out.println("Reply from "

+ rp.src_ip.getHostAddress() + ": bytes = "

+ rp.data.length + " time " + tmpStr + "TTL = "

+ rp.hop_limit)

listResult.add("Reply from " + rp.src_ip.getHostAddress()

+ ": bytes = " + rp.data.length + " time " + tmpStr

+ "TTL = " + rp.hop_limit)

}

}

} catch (Exception e) {

e.printStackTrace()

}

}

/**

* 接收ICMP报文

* @param jpcap

*/

public void startCapThread(final JpcapCaptor jpcap) {

Runnable runner = new Runnable() {

public void run() {

getIcmpPacket(jpcap)

}

}

new Thread(runner).start()

}

public static void main(String[] args) {

new JPing().ping("www.baidu.com")

}

}

---