java代码实现ping JAVA代码实现计算天数差,不足一天,取两位小数

如何java编程实现PING命令

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.

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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();

}

}

}

}

}

有谁知道怎样使用java编写ping程序

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点虐 .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 ListString listResult = new ArrayListString();

/**

* 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 = 0; i 5; i++) {

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("");

}

}

java怎样实现ping的功能...

可以用InetAddress的isReachable方法：

import java点虐 .InetAddress;

public class MainTest {

public static void main(String[] args) {

try {

int timeOut = 3000;

byte[] ip = new byte[] { (byte) 192, (byte) 168, (byte) 100, (byte) 151 };

int retry = 4;

InetAddress address = InetAddress.getByAddress(ip);

for (int i = 0; i retry; i++) {

if (address.isReachable(timeOut)) {

System.out.println(i + " OK");

} else {

System.out.println(i + " LOSS");

}

}

} catch (Exception e) {

e.printStackTrace();

}

}

}