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java获取公网ip

发布时间: 2021-03-12 14:23:07

⑴ java servlet如何获取客户端外网IP

||String ipAddress = null;
//ipAddress = this.getRequest().getRemoteAddr();
ipAddress = request.getHeader("x-forwarded-for");
if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
ipAddress = request.getHeader("Proxy-Client-IP");
}
if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
ipAddress = request.getHeader("WL-Proxy-Client-IP");
}
if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
ipAddress = request.getRemoteAddr();
if(ipAddress.equals("127.0.0.1")){
//根据网卡取本机配置的IP
InetAddress inet=null;
try {
inet = InetAddress.getLocalHost();
} catch (UnknownHostException e) {
e.printStackTrace();
}
ipAddress= inet.getHostAddress();
}

}

//对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割
if(ipAddress!=null && ipAddress.length()>15){ //"***.***.***.***".length() = 15
if(ipAddress.indexOf(",")>0){
ipAddress = ipAddress.substring(0,ipAddress.indexOf(","));
}
}

System.out.println("ip=="+ipAddress);
out.println("ip="+ipAddress);

⑵ java如何获得局域网的外网ip

指定IP的MAC 代码如下: Java code System.out.println(192.168.1.187对应网卡的MAC是:);NetworkInterface ne=NetworkInterface.getByInetAddress(InetAddress.getByName(192.168.1.187));byte[]mac=ne.getHardwareAddress();String mac_s=hexByte(mac[0])+:+hexByte(mac[1])+:+ hexByte(mac[2])+:+hexByte(mac[3])+:+ hexByte(mac[4])+:+hexByte(mac[5]);System.out.println(mac_s); 程序运行结果: 192.168.1.187对应网卡的MAC是: 00:0c:f1:20:75:58 工作组和计算机名字类似，可以到库里找

⑶ java获取到公网ip后如何强制更改公网ip

按照TCP/IP协议的规定，公网IP地址你是改不了的。

⑷ JAVA获取外网IP

请参考以下代码，可以获得任意给定网卡的ip地址：

import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Enumeration;

public class InternetTest {

public static void main(String[] args) {
String netCard = "lo";
try {
Enumeration<NetworkInterface> netInterfaces = NetworkInterface
.getNetworkInterfaces();
if (netInterfaces.hasMoreElements()) {
NetworkInterface netInterface = netInterfaces.nextElement();
if (netCard.equals(netInterface.getName())) {
// 子接口，linux下会取到父接口？？
Enumeration<NetworkInterface> subnetInterfaces = netInterface
.getSubInterfaces();
while (subnetInterfaces.hasMoreElements()) {
NetworkInterface subnetInterface = subnetInterfaces
.nextElement();
System.out.println(subnetInterface.getName());
Enumeration<InetAddress> subaddresses = netInterface
.getInetAddresses();
while (subaddresses.hasMoreElements()) {
InetAddress subaddress = subaddresses.nextElement();
System.out.println(subaddress.getHostAddress());
}
}
// 打印接口下所有IP
System.out.println(netInterface.getName());
Enumeration<InetAddress> addresses = netInterface
.getInetAddresses();
while (addresses.hasMoreElements()) {
InetAddress address = addresses.nextElement();
System.out.println(address.getHostAddress());
}
}
}
} catch (SocketException e) {
e.printStackTrace();
}
}
}

⑸ Java编程怎样获得自己在外网的真实ip

方法：
public String getRemortIP(HttpServletRequest request) { if (request.getHeader("x-forwarded-for") == null) { return request.getRemoteAddr(); } return request.getHeader("x-forwarded-for"); }

可是当访问http://www.5a520.cn /index.jsp/ 时，返回的IP地址始终是unknown，也并不是如上所示的127.0.0.1或192.168.1.110了，而我访问http://192.168.1.110：2046/index.jsp 时，则能返回客户端的真实IP地址，写了个方法去验证。
原因出在了Squid上。squid.conf 的配制文件forwarded_for 项默认是为on，如果 forwarded_for 设成了 off
则：X-Forwarded-For： unknown

⑹ java中如何获取到本机的外网ip地址

java获取本机的外网ip示例：
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
* 获取本机外网IP地址
* 思想是访问网站http://checkip.dyndns.org/，得到返回的文本后解析出本机在外网的IP地址
* @author pieryon
*
*/
public class ExternalIpAddressFetcher {
// 外网IP提供者的网址
private String externalIpProviderUrl;

// 本机外网IP地址
private String myExternalIpAddress;

public ExternalIpAddressFetcher(String externalIpProviderUrl) {
this.externalIpProviderUrl = externalIpProviderUrl;

String returnedhtml = fetchExternalIpProviderHTML(externalIpProviderUrl);

parse(returnedhtml);
}

/**
* 从外网提供者处获得包含本机外网地址的字符串
* 从http://checkip.dyndns.org返回的字符串如下
* <html><head><title>Current IP Check</title></head><body>Current IP Address: 123.147.226.222</body></html>
* @param externalIpProviderUrl
* @return
*/
private String fetchExternalIpProviderHTML(String externalIpProviderUrl) {
// 输入流
InputStream in = null;

// 到外网提供者的Http连接
HttpURLConnection httpConn = null;

try {
// 打开连接
URL url = new URL(externalIpProviderUrl);
httpConn = (HttpURLConnection) url.openConnection();

// 连接设置
HttpURLConnection.setFollowRedirects(true);
httpConn.setRequestMethod("GET");
httpConn.setRequestProperty("User-Agent",
"Mozilla/4.0 (compatible; MSIE 6.0; Windows 2000)");

// 获取连接的输入流
in = httpConn.getInputStream();
byte[] bytes=new byte[1024];// 此大小可根据实际情况调整

// 读取到数组中
int offset = 0;
int numRead = 0;
while (offset < bytes.length
&& (numRead=in.read(bytes, offset, bytes.length-offset)) >= 0) {
offset += numRead;
}

// 将字节转化为为UTF-8的字符串
String receivedString=new String(bytes,"UTF-8");

// 返回
return receivedString;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
in.close();
httpConn.disconnect();
} catch (Exception ex) {
ex.printStackTrace();
}
}

// 出现异常则返回空
return null;
}

/**
* 使用正则表达式解析返回的HTML文本,得到本机外网地址
* @param html
*/
private void parse(String html){
Pattern pattern=Pattern.compile("(\\d{1,3})[.](\\d{1,3})[.](\\d{1,3})[.](\\d{1,3})", Pattern.CASE_INSENSITIVE);
Matcher matcher=pattern.matcher(html);
while(matcher.find()){
myExternalIpAddress=matcher.group(0);
}
}

/**
* 得到本机外网地址,得不到则为空
* @return
*/
public String getMyExternalIpAddress() {
return myExternalIpAddress;
}

public static void main(String[] args){
ExternalIpAddressFetcher fetcher=new ExternalIpAddressFetcher("http://checkip.dyndns.org/");

System.out.println(fetcher.getMyExternalIpAddress());
}
}

⑺ java如何获取公网ip，有通过路由

如果要通过路由器，不同的路由器的获取方法不一样。通用的做法是通过 HttpClient 在网络上搜索关键字 ip, 然后提取出公网ip。

importjava.io.BufferedReader;
importjava.io.IOException;
importjava.io.InputStream;
importjava.io.InputStreamReader;
importjava.net.URL;
importjava.net.URLConnection;
importjava.util.regex.Matcher;
importjava.util.regex.Pattern;

publicclassApp{

//获取网页源码
staticStringhttpGet(Stringurl){

StringBufferbuffer=newStringBuffer();

try{

URLConnectionconn=newURL(url).openConnection();

conn.addRequestProperty("User-Agent","Mozilla/5.0(WindowsNT10.0;Win64;x64)AppleWebKit/537.36(KHTML,likeGecko)Chrome/67.0.3396.99Safari/537.36");

try(InputStreaminputStream=conn.getInputStream();
InputStreamReaderstreamReader=newInputStreamReader(inputStream);
BufferedReaderreader=newBufferedReader(streamReader);){

Stringline=null;

while((line=reader.readLine())!=null){
buffer.append(line).append(System.lineSeparator());
}
}

}catch(IOExceptione){
e.printStackTrace();
}

returnbuffer.toString();
}

publicstaticvoidmain(String[]args){

Stringhtml=httpGet("https://www..com/s?wd=ip");

//提出IP

Patternpattern=Pattern.compile("<span\sclass="c-gap-right">本机IP: ([^<]+)</span>");

Matchermatcher=pattern.matcher(html);

if(matcher.find()){

Stringip=matcher.group(1);

System.out.println(ip);
}

}
}

⑻ java怎么获取当前电脑的内网ip

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);
}

⑼ JAVA如何获得外网IP地址

java获取外网地址方法：
public class Main {

public static void main(String[] args) throws SocketException {
System.out.println(Main.getRealIp());
}

public static String getRealIp() throws SocketException {
String localip = null;// 本地IP，如果没有配置外网IP则返回它
String netip = null;// 外网IP

Enumeration<NetworkInterface> netInterfaces =
NetworkInterface.getNetworkInterfaces();
InetAddress ip = null;
boolean finded = false;// 是否找到外网IP
while (netInterfaces.hasMoreElements() && !finded) {
NetworkInterface ni = netInterfaces.nextElement();
Enumeration<InetAddress> address = ni.getInetAddresses();
while (address.hasMoreElements()) {
ip = address.nextElement();
if (!ip.isSiteLocalAddress()
&& !ip.isLoopbackAddress()
&& ip.getHostAddress().indexOf(":") == -1) {// 外网IP
netip = ip.getHostAddress();
finded = true;
break;
} else if (ip.isSiteLocalAddress()
&& !ip.isLoopbackAddress()
&& ip.getHostAddress().indexOf(":") == -1) {// 内网IP
localip = ip.getHostAddress();
}
}
}

if (netip != null && !"".equals(netip)) {
return netip;
} else {
return localip;
}
}
}

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java获取公网ip

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