1. java如何獲取Linux操作系統下的ip地址和網
以下代碼需要 JDK 6 及以後版本，如果是 JDK 6 以下版本的話，沒有直接獲得 MAC 的 API。
import java.net.InetAddress;import java.net.NetworkInterface;import java.net.SocketException;import java.util.Enumeration; public class NetworkInfo { private final static char[] HEX = "0123456789ABCDEF".toCharArray(); public static void main(String[] args) throws SocketException { for(Enumeration<NetworkInterface> i = NetworkInterface.getNetworkInterfaces(); i.hasMoreElements(); ) { NetworkInterface ni = i.nextElement(); System.out.println("NETWORK CARD NAME: " + ni.getDisplayName()); System.out.println("MAC: " + toMacString(ni.getHardwareAddress())); for(Enumeration<InetAddress> j = ni.getInetAddresses(); j.hasMoreElements(); ) { System.out.println(" " + j.nextElement()); } } } private static String toMacString(byte[] bys) { if(bys == null) { return null; } char[] chs = new char[bys.length * 3 - 1]; for(int i = 0, k = 0; i < bys.length; i++) { if(i > 0) { chs[k++] = '-'; } chs[k++] = HEX[(bys[i] >> 4) & 0xf]; chs[k++] = HEX[bys[i] & 0xf]; } return new String(chs); }}
2. java中如何獲取到本機的外網ip地址
java獲取本機的外網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;
/**
* 獲取本機外網IP地址
* 思想是訪問網站http://checkip.dyndns.org/，得到返回的文本後解析出本機在外網的IP地址
* @author pieryon
*
*/
public class ExternalIpAddressFetcher {
// 外網IP提供者的網址
private String externalIpProviderUrl;
// 本機外網IP地址
private String myExternalIpAddress;
public ExternalIpAddressFetcher(String externalIpProviderUrl) {
this.externalIpProviderUrl = externalIpProviderUrl;
String returnedhtml = fetchExternalIpProviderHTML(externalIpProviderUrl);
parse(returnedhtml);
}
/**
* 從外網提供者處獲得包含本機外網地址的字元串
* 從http://checkip.dyndns.org返回的字元串如下
* <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) {
// 輸入流
InputStream in = null;
// 到外網提供者的Http連接
HttpURLConnection httpConn = null;
try {
// 打開連接
URL url = new URL(externalIpProviderUrl);
httpConn = (HttpURLConnection) url.openConnection();
// 連接設置
HttpURLConnection.setFollowRedirects(true);
httpConn.setRequestMethod("GET");
httpConn.setRequestProperty("User-Agent",
"Mozilla/4.0 (compatible; MSIE 6.0; Windows 2000)");
// 獲取連接的輸入流
in = httpConn.getInputStream();
byte[] bytes=new byte[1024];// 此大小可根據實際情況調整
// 讀取到數組中
int offset = 0;
int numRead = 0;
while (offset < bytes.length
&& (numRead=in.read(bytes, offset, bytes.length-offset)) >= 0) {
offset += numRead;
}
// 將位元組轉化為為UTF-8的字元串
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();
}
}
// 出現異常則返回空
return null;
}
/**
* 使用正則表達式解析返回的HTML文本,得到本機外網地址
* @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);
}
}
/**
* 得到本機外網地址,得不到則為空
* @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());
}
}
3. 在Linux系統下用Java語言獲取客戶端的IP地址，MAC地址，客戶端的主機名稱
這個網上很多，主要是機器必須支持ICMP和NETBIOS協議。你參考一下：
public String getIP()
{
InetAddress inet;
try {
inet =
InetAddress.getLocalHost();
InetAddress.getByName("");
return
inet.getHostAddress();
} catch (UnknownHostException e) {
// TODO
Auto-generated catch block
e.printStackTrace();
}
return "";
}