本文实例为大家分享了Java测试网络连通性的方法，供大家参考，具体内容如下
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。
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; } /** * 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"); } } }
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持查字典教程网。
【java如何测试网络连通性】相关文章：