本文目录一览：
- 1、java如何查询本机ip地址和mac地址
- 2、java中如何获取到本机的外网ip地址?
- 3、java 如何验证ip地址
- 4、java中获取本地IP地址
- 5、java如何获取用户真实的ip
- 6、java怎么获取请求的ip
java如何查询本机ip地址和mac地址
Java中可以使用程序来获取本地ip地址和mac地址，使用InetAddress这个工具类，示例如下：
import java.net.*;
public class NetInfo {
public static void main(String[] args) {
new NetInfo().say();
}
public void say() {
try {
InetAddress i = InetAddress.getLocalHost();
System.out.println(i); //计算机名称和IP
System.out.println(i.getHostName()); //名称
System.out.println(i.getHostAddress()); //只获得IP
}
catch(Exception e){e.printStackTrace();}
}
}
也可以通过命令行窗口来查看本地ip和mac地址，输入命令：ipconfig。
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，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
* 从返回的字符串如下
* htmlheadtitleCurrent IP Check/title/headbodyCurrent 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("");
System.out.println(fetcher.getMyExternalIpAddress());
}
}
java 如何验证ip地址
可以使用正则表达式验证ip地址，ip地址分为v4和v6两个版本，v4为32位，分4段，中间用.隔开，v6为128位，可分为4段32位中间用::隔开。
以下是验证类详细代码：
import java.util.regex.Pattern;
/**
* A collection of utilities relating to InetAddresses.
*/
public class InetAddressUtils {
public static void main(String[] args){
String addr="192.168.1.2";
System.out.println(isIPv4Address(addr));
}
private static final Pattern IPV4_PATTERN =
Pattern.compile(
"^(25[0-5]|2[0-4]\\d|[0-1]?\\d?\\d)(\\.(25[0-5]|2[0-4]\\d|[0-1]?\\d?\\d)){3}$");
private static final Pattern IPV6_STD_PATTERN =
Pattern.compile(
"^(?:[0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}$");
private static final Pattern IPV6_HEX_COMPRESSED_PATTERN =
Pattern.compile(
"^((?:[0-9A-Fa-f]{1,4}(?::[0-9A-Fa-f]{1,4})*)?)::((?:[0-9A-Fa-f]{1,4}(?::[0-9A-Fa-f]{1,4})*)?)$");
public static boolean isIPv4Address(final String input) {
return IPV4_PATTERN.matcher(input).matches();
}
public static boolean isIPv6StdAddress(final String input) {
return IPV6_STD_PATTERN.matcher(input).matches();
}
public static boolean isIPv6HexCompressedAddress(final String input) {
return IPV6_HEX_COMPRESSED_PATTERN.matcher(input).matches();
}
public static boolean isIPv6Address(final String input) {
return isIPv6StdAddress(input) || isIPv6HexCompressedAddress(input);
}
}
java中获取本地IP地址
方法如下：
方法一，使用CMD命令：
public static String getLocalIPForCMD(){
StringBuilder sb = new StringBuilder();
String command = "cmd.exe /c ipconfig | findstr IPv4";
try {
Process p = Runtime.getRuntime().exec(command);
BufferedReader br = new BufferedReader(new InputStreamReader(p.getInputStream()));
String line = null;
while((line = br.readLine()) != null){
line = line.substring(line.lastIndexOf(":")+2,line.length());
sb.append(line);
}
br.close();
p.destroy();
} catch (IOException e) {
e.printStackTrace();
}
return sb.toString();
}
方法二，使用Java方法：
public static String getLocalIPForJava(){
StringBuilder sb = new StringBuilder();
try {
EnumerationNetworkInterface en = NetworkInterface.getNetworkInterfaces();
while (en.hasMoreElements()) {
NetworkInterface intf = (NetworkInterface) en.nextElement();
EnumerationInetAddress enumIpAddr = intf.getInetAddresses();
while (enumIpAddr.hasMoreElements()) {
InetAddress inetAddress = (InetAddress) enumIpAddr.nextElement();
if (!inetAddress.isLoopbackAddress() !inetAddress.isLinkLocalAddress()
inetAddress.isSiteLocalAddress()) {
sb.append(inetAddress.getHostAddress().toString()+"\n");
}
}
}
} catch (SocketException e) { }
return sb.toString();
}
java如何获取用户真实的ip
1、如果服务器如果没有采用反向代理，而且客户端没有用正向代理的话，那么可以获取客户端的真实IP地址request.getRemoteAddr()
2、如果服务器如果没有采用反向代理，而且客户端有用正向代理的话，那么通过request.getRemoteAddr()获取客户端的IP地址是客户端 的代理服务器的地址，并不是客户端的真实地址，
3、如果客户端使用的是多层代理的话，服务器获得的客户端地址是客户端的最外围代理服务器的地址如果服务器如果采用反向代理服务器，不管客户端采用的是何种方式访问服务器。
//获得客户端真实IP地址的方法一：
public String getRemortIP(HttpServletRequest request) {
if (request.getHeader("x-forwarded-for") == null) {
return request.getRemoteAddr();
}
return request.getHeader("x-forwarded-for");
}
//获得客户端真实IP地址的方法二：
public String getIpAddr(HttpServletRequest request) {
String ip = request.getHeader("x-forwarded-for");
if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
ip = request.getHeader("Proxy-Client-IP");
}
if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
ip = request.getHeader("WL-Proxy-Client-IP");
}
if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
ip = request.getRemoteAddr();
}
return ip;
}
java怎么获取请求的ip
java获取外网ip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
EnumerationNetworkInterface netInterfaces =
NetworkInterface.getNetworkInterfaces();
InetAddress ip = null;
boolean finded = false;// 是否找到外网IP
while (netInterfaces.hasMoreElements() !finded) {
NetworkInterface ni = netInterfaces.nextElement();
EnumerationInetAddress 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;
}
}
}
