ip的获取与ping ip

import javax.servlet.http.HttpServletRequest;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.InetAddress;

/**
 * IP工具
 * @Author ChenWenChao
 */
public class IpUtils {
    /**
     * 获取真实IP
     * @param request 请求体
     * @return 真实IP
     */
    public static String getRealIp(HttpServletRequest request) {
        // 这个一般是Nginx反向代理设置的参数
        String ip = request.getHeader("X-Real-IP");
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            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();
        }
        // 处理多IP的情况（只取第一个IP）
        if (ip != null && ip.contains(",")) {
            String[] ipArray = ip.split(",");
            ip = ipArray[0];
        }
        return ip;
    }

    /**
     * ping ip
     * @param ip
     * @return true：ping通，false：ping不通
     */
    public static boolean pingIp(String ip) {
        Runtime runtime = Runtime.getRuntime(); // 获取当前程序的运行进对象
        Process process = null; // 声明处理类对象
        String line = null; // 返回行信息
        InputStream is = null; // 输入流
        InputStreamReader isr = null; // 字节流
        BufferedReader br = null;
        boolean res = false; // 结果
        try {
            process = runtime.exec("ping " + ip); // PING
            is = process.getInputStream(); // 实例化输入流
            isr = new InputStreamReader(is, "gbk"); // 把输入流转换成字节流,传入参数为了解决"gbk"中文乱码问题
            br = new BufferedReader(isr); // 从字节中读取文本
            while ((line = br.readLine()) != null) {
                line = new String(line.getBytes("UTF-8"), "UTF-8");
                if (line.contains("TTL")) { // 通了
                    res = true;
                    System.out.println(line);
                    break;
                }
            }
            is.close();
            isr.close();
            br.close();
        } catch (IOException e) {
            System.out.println(e);
            runtime.exit(1);
        }
        return res;
    }

    /**
     * ping ip
     * @param ip
     * @param timeout 超时时间，单位毫秒(经过多次测试，时间建议设置超过3秒)
     * @return true：ping通，false：ping不通
     */
    public static boolean pingIp(String ip, int timeout) throws Exception {
        InetAddress address = InetAddress.getByName(ip);
        return address.isReachable(timeout);
    }
}