java获取访问ip地址
❶ 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：
importjava.net.*;
publicclassNetInfo{
publicstaticvoidmain(String[]args){
newNetInfo().say();
}
publicvoidsay(){
try{
InetAddressi=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(Exceptione){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。
❷ java中，如何获取真实的IP地址
import java.net.InetAddress;
import java.net.UnknownHostException;
public class NsLookup {
static public void main(String[] args){
try {InetAddress address = InetAddress.getByName(args[0]);
System.out.println(args[0]+": "+address.getHostAddress());
}catch(UnknownHostException uhe) {
System.err.println("Unable to find: "+args[0]);
}
}
}
❸ 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 {
Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces();
while (en.hasMoreElements()) {
NetworkInterface intf = (NetworkInterface) en.nextElement();
Enumeration<InetAddress> 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();
}
❹ Java怎样获取当前机器外网IP
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());
}
}
❺ 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：
publicStringgetRemortIP(HttpServletRequestrequest){
if(request.getHeader("x-forwarded-for")==null){
returnrequest.getRemoteAddr();
}
returnrequest.getHeader("x-forwarded-for");
}
//获得客户端真实IP地址的方法二：
publicStringgetIpAddr(HttpServletRequestrequest){
Stringip=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();
}
returnip;
}