一、在Web請求中獲取請求使用者的IP地址

public static String getUserRealIP(HttpServletRequest request) throws UnknownHostException {
        String ip = "";

        // 有的user可能使用代理，為處理使用者使用代理的情況，使用x-forwarded-for

        if  (request.getHeader("x-forwarded-for") == null)  {

        ip = request.getRemoteAddr();

        }  
 
else  {

        ip = request.getHeader("x-forwarded-for");

        }

        if  ("127.0.0.1".equals(ip))  {

        // 獲取本機真正的ip地址

        ip = InetAddress.getLocalHost().getHostAddress();

        }
        return ip;
        }

二、獲取本機IP地址和主機名

import java.util.*;

        import java.net.*;


public
 
 class getMyIP

{

    public static void main(String[] args) {

        String ip = null;

        String host = null;

        try{

            InetAddress ia = InetAddress.getLocalHost();

            host = ia.getHostName();//獲取計算機名字

            ip = ia.getHostAddress();//獲取IP

        } catch(UnknownHostException e) {

            e.printStackTrace();

        }

        System.out.println(host);

        System.out.println(IP);

    }

}
 

三、網上搜索的方法

import javax.servlet.http.HttpServletRequest;

/**
 * 自定義訪問物件工具類
 *
 * 獲取物件的IP地址等資訊
 * @author X-rapido
 *
 */
public class CusAccessObjectUtil {

    /**
     * 獲取使用者真實IP地址，不使用request.getRemoteAddr();的原因是有可能使用者使用了代理軟體方式避免真實IP地址,
     *
     * 可是，如果通過了多級反向代理的話，X-Forwarded-For的值並不止一個，而是一串IP值，究竟哪個才是真正的使用者端的真實IP呢？
     * 答案是取X-Forwarded-For中第一個非unknown的有效IP字串。
     *
     * 如：X-Forwarded-For：192.168.1.110, 192.168.1.120, 192.168.1.130,
     * 192.168.1.100
     *
     * 使用者真實IP為： 192.168.1.110
     *
     * @param request
     * @return
     */
    public static String getIpAddress(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.getHeader("HTTP_CLIENT_IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("HTTP_X_FORWARDED_FOR");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
            if("127.0.0.1".equals(ip)||"0:0:0:0:0:0:0:1".equals(ip)){
                //根據網絡卡取本機配置的IP
                InetAddress inet=null;
                try {
                    inet = InetAddress.getLocalHost();
                } catch (UnknownHostException e) {
                    e.printStackTrace();
                }
                ip= inet.getHostAddress();
            }
        }
        return ip;
    }

}

四、擴充套件知識

Java獲取客戶端請求電腦IP，作業系統等等各種資訊

HttpServletRequest request = ServletActionContext.getRequest();
        System.out.println("瀏覽器基本資訊："+request.getHeader("user-agent"));
        System.out.println("客戶端系統名稱："+System.getProperty("os.name"));
        System.out.println("客戶端系統版本："+System.getProperty("os.version"));
        System.out.println("客戶端作業系統位數："+System.getProperty("os.arch"));
        System.out.println("HTTP協議版本："+request.getProtocol());
        System.out.println("請求編碼格式："+request.getCharacterEncoding());
        System.out.println("Accept："+request.getHeader("Accept"));
        System.out.println("Accept-語言："+request.getHeader("Accept-Language"));
        System.out.println("Accept-編碼："+request.getHeader("Accept-Encoding"));
        System.out.println("Connection："+request.getHeader("Connection"));
        System.out.println("Cookie："+request.getHeader("Cookie"));
        System.out.println("客戶端發出請求時的完整URL"+request.getRequestURL());
        System.out.println("請求行中的資源名部分"+request.getRequestURI());
        System.out.println("請求行中的引數部分"+request.getRemoteAddr());
        System.out.println("客戶機所使用的網路埠號"+request.getRemotePort());
        System.out.println("WEB伺服器的IP地址"+request.getLocalAddr());
        System.out.println("WEB伺服器的主機名"+request.getLocalName());
        System.out.println("客戶機請求方式"+request.getMethod());
        System.out.println("請求的檔案的路徑"+request.getServerName());
        System.out.println("請求體的資料流"+request.getReader());
        BufferedReader br=request.getReader();
        String res = "";
        while ((res = br.readLine()) != null) {
        System.out.println("request body:" + res);
        }
        System.out.println("請求所使用的協議名稱"+request.getProtocol());
        System.out.println("請求中所有引數的名字"+request.getParameterNames());
        Enumeration enumNames= request.getParameterNames();
        while (enumNames.hasMoreElements()) {
        String key = (String) enumNames.nextElement();
        System.out.println("引數名稱："+key);
        }

五、在本機上獲取計算機資訊

public void getIP(){
        try {
        InetAddress address = InetAddress.getLocalHost();
        String ip = address.getHostAddress().toString();//獲取本機IP
        String hostName = address.getHostName().toString();//獲取本機計算機名稱
        System.out.println("ip is:"+ip);
        System.out.println("host name is:"+hostName);
        } catch (UnknownHostException e) {
        e.printStackTrace();
        }
        }