Java测试网络连通性
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第一种方式：利用java运行时：
Java代码 
/**
* test network
* @param ip
*/
private void getNetworkState(String ip) {
Runtime runtime = Runtime.getRuntime();
try {
log.info("=================正在测试网络连通性ip："+ip);
Process process = runtime.exec("ping " +ip);
InputStream iStream = process.getInputStream();
InputStreamReader iSReader = new InputStreamReader(iStream,"UTF-8");
BufferedReader bReader = new BufferedReader(iSReader);
String line = null;
StringBuffer sb = new StringBuffer();
while ((line = bReader.readLine()) != null) {
sb.append(line);
}
iStream.close();
iSReader.close();
bReader.close();
String result = new String(sb.toString().getBytes("UTF-8"));
log.info("ping result:"+result);
if (!StringUtils.isBlank(result)) {
if (result.indexOf("TTL") > 0 || result.indexOf("ttl") > 0) {
log.info("网络正常，时间: " + TimeUtil.getCurDate("yyyy-mm-dd hh:mm:ss"));
} else {
log.info("网络断开，时间 :" + TimeUtil.getCurDate("yyyy-mm-dd hh:mm:ss"));
}
}
} catch (Exception e) {
log.error("网络异常："+e.getMessage());
e.printStackTrace();
}
}
在windows平台上，上面代码没有为，ping ip 会结束，而在linux环境中ping命令，ping不通时，
会卡住，ping通，会不定的输出信息，考虑用另一种方式socket。 下载
第二种方式socket：
Java代码
package com.util.network;
import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.NetworkInterface;
import java.net.Socket;
import java.net.SocketAddress;
import java.net.SocketException;
import java.net.UnknownHostException;
import java.util.Enumeration;
import org.apache.commons.lang.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* 测试网络连通性
*
* @author donald
*
*/
public class NetworkHelper {
private static Logger log = LoggerFactory.getLogger(NetworkHelper.class);
private static NetworkHelper instance = null;
public static synchronized NetworkHelper getInstance(){
if(instance == null){
instance = new NetworkHelper();
}
return instance;
}
/**
* 测试本地能否ping ip
*
* @param ip
* @return
*/
public boolean isReachIp(String ip) {
boolean isReach = false;
try {
InetAddress address = InetAddress.getByName(ip);// ping this IP
if (address instanceof java.net.Inet4Address) {
log.info(ip + " is ipv4 address");
} else if (address instanceof java.net.Inet6Address) {
log.info(ip + " is ipv6 address");
} else {
log.info(ip + " is unrecongized");
}
if (address.isReachable(5000)) {
isReach = true;
log.info("SUCCESS - ping " + ip
+ " with no interface specified");
} else {
isReach = false;
log.info("FAILURE - ping " + ip
+ " with no interface specified");
}
} catch (Exception e) {
log.error("error occurs:" + e.getMessage());
}
return isReach;
}
/**
* 测试本地所有的网卡地址都能ping通 ip
*
* @param ip
* @return
*/
public boolean isReachNetworkInterfaces(String ip) {
boolean isReach = false;
try {
InetAddress address = InetAddress.getByName(ip);// ping this IP
if (address instanceof java.net.Inet4Address) {
log.info(ip + " is ipv4 address");
} else if (address instanceof java.net.Inet6Address) {
log.info(ip + " is ipv6 address");
} else {
log.info(ip + " is unrecongized");
}
if (address.isReachable(5000)) {
isReach = true;
log.info("SUCCESS - ping " + ip
+ " with no interface specified");
} else {
isReach = false;
log.info("FAILURE - ping " + ip
+ " with no interface specified");
}
if (isReach) {
log.info("-------Trying different interfaces--------");
Enumeration<NetworkInterface> netInterfaces = NetworkInterface
.getNetworkInterfaces();
while (netInterfaces.hasMoreElements()) {
NetworkInterface ni = netInterfaces.nextElement();
log.info("Checking interface, DisplayName:"
+ ni.getDisplayName() + ", Name:" + ni.getName());
if (address.isReachable(ni, 0, 5000)) {
isReach = true;
log.info("SUCCESS - ping " + ip);
} else {
isReach = false;
log.info("FAILURE - ping " + ip);
}
Enumeration<InetAddress> ips = ni.getInetAddresses();
while (ips.hasMoreElements()) {
log.info("IP: " + ips.nextElement().getHostAddress());
}
log.info("-----------------check now NetworkInterface is done--------------------------");
}
}
} catch (Exception e) {
log.error("error occurs:" + e.getMessage());
}
return isReach;
}
/**
* 获取能与远程主机指定端口建立连接的本机ip地址
* @param remoteAddr
* @param port
* @return
*/
public String getReachableIP(InetAddress remoteAddr, int port) {
String retIP = null;
Enumeration<NetworkInterface> netInterfaces;
try {
netInterfaces = NetworkInterface.getNetworkInterfaces();
while (netInterfaces.hasMoreElements()) {
NetworkInterface ni = netInterfaces.nextElement();
Enumeration<InetAddress> localAddrs = ni.getInetAddresses();
while (localAddrs.hasMoreElements()) {
InetAddress localAddr = localAddrs.nextElement();
if (isReachable(localAddr, remoteAddr, port, 5000)) {
retIP = localAddr.getHostAddress();
break;
}
}
}
} catch (SocketException e) {
log.error("Error occurred while listing all the local network addresses:"
+ e.getMessage());
}
if (retIP == null) {
log.info("NULL reachable local IP is found!");
} else {
log.info("Reachable local IP is found, it is " + retIP);
}
return retIP;
}
/**
* 获取能与远程主机指定端口建立连接的本机ip地址
* @param remoteIp
* @param port
* @return
*/
public String getReachableIP(String remoteIp, int port) {
String retIP = null;
InetAddress remoteAddr = null;
Enumeration<NetworkInterface> netInterfaces;
try {
remoteAddr = InetAddress.getByName(remoteIp);
netInterfaces = NetworkInterface.getNetworkInterfaces();
while (netInterfaces.hasMoreElements()) {
NetworkInterface ni = netInterfaces.nextElement();
Enumeration<InetAddress> localAddrs = ni.getInetAddresses();
while (localAddrs.hasMoreElements()) {
InetAddress localAddr = localAddrs.nextElement();
if (isReachable(localAddr, remoteAddr, port, 5000)) {
retIP = localAddr.getHostAddress();
break;
}
}
}
} catch (UnknownHostException e) {
log.error("Error occurred while listing all the local network addresses:"+ e.getMessage());
}catch (SocketException e) {
log.error("Error occurred while listing all the local network addresses:"+ e.getMessage());
}
if (retIP == null) {
log.info("NULL reachable local IP is found!");
} else {
log.info("Reachable local IP is found, it is " + retIP);
}
return retIP;
} 下载
/**
* 测试localInetAddr能否与远程的主机指定端口建立连接相连
*
* @param localInetAddr
* @param remoteInetAddr
* @param port
* @param timeout
* @return
*/
public boolean isReachable(InetAddress localInetAddr,
InetAddress remoteInetAddr, int port, int timeout) {
boolean isReachable = false;
Socket socket = null;
try {
socket = new Socket();
// 端口号设置为 0 表示在本地挑选一个可用端口进行连接
SocketAddress localSocketAddr = new InetSocketAddress(
localInetAddr, 0);
socket.bind(localSocketAddr);
InetSocketAddress endpointSocketAddr = new InetSocketAddress(
remoteInetAddr, port);
socket.connect(endpointSocketAddr, timeout);
log.info("SUCCESS - connection established! Local: "
+ localInetAddr.getHostAddress() + " remote: "
+ remoteInetAddr.getHostAddress() + " port" + port);
isReachable = true;
} catch (IOException e) {
log.error("FAILRE - CAN not connect! Local: "
+ localInetAddr.getHostAddress() + " remote: "
+ remoteInetAddr.getHostAddress() + " port" + port);
} finally {
if (socket != null) {
try {
socket.close();
} catch (IOException e) {
log.error("Error occurred while closing socket:"
+ e.getMessage());
}
}
}
return isReachable;
}
/**
* 测试localIp能否与远程的主机指定端口建立连接相连
*
* @param localIp
* @param remoteIp
* @param port
* @param timeout
* @return
*/
public boolean isReachable(String localIp, String remoteIp,
int port, int timeout) {
boolean isReachable = false;
Socket socket = null;
InetAddress localInetAddr = null;
InetAddress remoteInetAddr = null;
try {
localInetAddr = InetAddress.getByName(localIp);
remoteInetAddr = InetAddress.getByName(remoteIp);
socket = new Socket();
// 端口号设置为 0 表示在本地挑选一个可用端口进行连接
SocketAddress localSocketAddr = new InetSocketAddress(
localInetAddr, 0);
socket.bind(localSocketAddr);
InetSocketAddress endpointSocketAddr = new InetSocketAddress(
remoteInetAddr, port);
socket.connect(endpointSocketAddr, timeout);
log.info("SUCCESS - connection established! Local: "
+ localInetAddr.getHostAddress() + " remote: "
+ remoteInetAddr.getHostAddress() + " port" + port);
isReachable = true;
} catch (IOException e) {
log.error("FAILRE - CAN not connect! Local: "
+ localInetAddr.getHostAddress() + " remote: "
+ remoteInetAddr.getHostAddress() + " port" + port);
} finally {
if (socket != null) {
try {
socket.close();
} catch (IOException e) {
log.error("Error occurred while closing socket:"
+ e.getMessage());
}
}
}
return isReachable;
}
public static void main(String[] args) {
if(NetworkHelper.getInstance().isReachIp("192.168.126.128")){
log.info("=======本机可以ping通ip："+"192.168.126.128");
}
else{
log.info("=======本机ping不通ip："+"192.168.126.128");
}
if(NetworkHelper.getInstance().isReachNetworkInterfaces("192.168.126.128")){
log.info("=======本机所有网卡可以ping通ip："+"192.168.126.128");
}
else{
log.info("=======本机所有网卡ping不通ip："+"192.168.126.128");
}
String localIp = NetworkHelper.getInstance().getReachableIP("192.168.126.128",8081);
if(!StringUtils.isBlank(localIp)){
log.info("=======本机可以与ip："+"192.168.126.128"+",port:"+8081+"建立连接的IP："+localIp);
}
else{
log.info("=======本机不能与ip："+"192.168.126.128"+",port:"+8081+"建立连接的IP");
}
}
}
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