獲取IP地址工具類

import java.net.InetAddress;
import java.net.UnknownHostException;

import javax.servlet.http.HttpServletRequest;

public class ToolIP {
    /**
     * <h6>功能:獲取本地IP</h6>
     * 如果沒有獲取到本地IP則返回0.0.0.0
     * 
     * @return 本地IP地址
     */
    public static String getLocalIpAddr() {
        String localIpAddr;
        try {
            localIpAddr = InetAddress.getLocalHost().getHostAddress();
        } catch (UnknownHostException e) {
            localIpAddr = "0.0.0.0";
        }
        return localIpAddr;
    }

     /** 
     * 獲取用戶真實IP地址，不使用request.getRemoteAddr()的原因是有可能用戶使用了代理軟件方式避免真實IP地址, 
     * 可是，如果通過了多級反向代理的話，X-Forwarded-For的值并不止一個，而是一串IP值 
     *  
     * @return ip
     */
    public static String getIpAddr(HttpServletRequest request) {
        String ip = request.getHeader("x-forwarded-for"); 
        if (ip != null && ip.length() != 0 && !"unknown".equalsIgnoreCase(ip)) {  
            // 多次反向代理后會有多個ip值，第一個ip才是真實ip
            if( ip.indexOf(",")!=-1 ){
                ip = ip.split(",")[0];
            }
        }  
        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.getHeader("X-Real-IP");  
        }  
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {  
            ip = request.getRemoteAddr();  
        } 
        return ip;  
    }
}