Get the real ip of the server

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.Inet4Address;
import java.net.InetAddress;
import java.net.InterfaceAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
 
import javax.servlet.http.HttpServletRequest;
 
import org.apache.http.HttpEntity;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import org.springframework.http.HttpMethod;
 
/**
 * 常用工具类
 *
 * @author 席红蕾
 * @date 2016-09-27
 * @version 1.0
 */
public class WebToolUtils {
 
    /**
     * 获取本地IP地址
     *
     * @throws SocketException
     */
    public static String getLocalIP() throws UnknownHostException, SocketException {
        if (isWindowsOS()) {
            return InetAddress.getLocalHost().getHostAddress();
        } else {
            return getLinuxLocalIp();
        }
    }
 
    /**
     * 判断操作系统是否是Windows
     *
     * @return
     */
    public static boolean isWindowsOS() {
        boolean isWindowsOS = false;
        String osName = System.getProperty("os.name");
        if (osName.toLowerCase().indexOf("windows") > -1) {
            isWindowsOS = true;
        }
        return isWindowsOS;
    }
 
    /**
     * 获取本地Host名称
     */
    public static String getLocalHostName() throws UnknownHostException {
        return InetAddress.getLocalHost().getHostName();
    }
 
    /**
     * 获取Linux下的IP地址
     *
     * @return IP地址
     * @throws SocketException
     */
    private static String getLinuxLocalIp() throws SocketException {
        String ip = "";
        try {
            for (Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements();) {
                NetworkInterface intf = en.nextElement();
                String name = intf.getName();
                if (!name.contains("docker") && !name.contains("lo")) {
                    for (Enumeration<InetAddress> enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements();) {
                        InetAddress inetAddress = enumIpAddr.nextElement();
                        if (!inetAddress.isLoopbackAddress()) {
                            String ipaddress = inetAddress.getHostAddress().toString();
                            if (!ipaddress.contains("::") && !ipaddress.contains("0:0:") && !ipaddress.contains("fe80")) {
                                ip = ipaddress;
                                System.out.println(ipaddress);
                            }
                        }
                    }
                }
            }
        } catch (SocketException ex) {
            System.out.println("获取ip地址异常");
            ip = "127.0.0.1";
            ex.printStackTrace();
        }
        System.out.println("IP:"+ip);
        return ip;
    }
 
    /**
     * 获取用户真实IP地址，不使用request.getRemoteAddr();的原因是有可能用户使用了代理软件方式避免真实IP地址,
     *
     * 可是，如果通过了多级反向代理的话，X-Forwarded-For的值并不止一个，而是一串IP值，究竟哪个才是真正的用户端的真实IP呢？
     * 答案是取X-Forwarded-For中第一个非unknown的有效IP字符串。
     *
     * 如：X-Forwarded-For：192.168.1.110, 192.168.1.120, 192.168.1.130,
     * 192.168.1.100
     *
     * 用户真实IP为： 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();
        }
        return ip;
    }
 
    /**
     * 向指定URL发送GET方法的请求
     *
     * @param url
     *            发送请求的URL
     * @param param
     *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return URL 所代表远程资源的响应结果
     */
    // public static String sendGet(String url, String param) {
    // String result = "";
    // BufferedReader in = null;
    // try {
    // String urlNameString = url + "?" + param;
    // URL realUrl = new URL(urlNameString);
    // // 打开和URL之间的连接
    // URLConnection connection = realUrl.openConnection();
    // // 设置通用的请求属性
    // connection.setRequestProperty("accept", "*/*");
    // connection.setRequestProperty("connection", "Keep-Alive");
    // connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible;
    // MSIE 6.0; Windows NT 5.1;SV1)");
    // // 建立实际的连接
    // connection.connect();
    // // 获取所有响应头字段
    // Map<String, List<String>> map = connection.getHeaderFields();
    // // 遍历所有的响应头字段
    // for (String key : map.keySet()) {
    // System.out.println(key + "--->" + map.get(key));
    // }
    // // 定义 BufferedReader输入流来读取URL的响应
    // in = new BufferedReader(new
    // InputStreamReader(connection.getInputStream()));
    // String line;
    // while ((line = in.readLine()) != null) {
    // result += line;
    // }
    // } catch (Exception e) {
    // System.out.println("发送GET请求出现异常！" + e);
    // e.printStackTrace();
    // }
    // // 使用finally块来关闭输入流
    // finally {
    // try {
    // if (in != null) {
    // in.close();
    // }
    // } catch (Exception e2) {
    // e2.printStackTrace();
    // }
    // }
    // return result;
    // }
 
    /**
     * 向指定 URL 发送POST方法的请求
     *
     * @param url
     *            发送请求的 URL
     * @param param
     *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return 所代表远程资源的响应结果
     */
    public static void sendPost(String pathUrl, String name, String pwd, String phone, String content) {
        // PrintWriter out = null;
        // BufferedReader in = null;
        // String result = "";
        // try {
        // URL realUrl = new URL(url);
        // // 打开和URL之间的连接
        // URLConnection conn = realUrl.openConnection();
        // // 设置通用的请求属性
        // conn.setRequestProperty("accept", "*/*");
        // conn.setRequestProperty("connection", "Keep-Alive");
        // conn.setRequestProperty("user-agent",
        // "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
        // // 发送POST请求必须设置如下两行
        // conn.setDoOutput(true);
        // conn.setDoInput(true);
        // // 获取URLConnection对象对应的输出流
        // out = new PrintWriter(conn.getOutputStream());
        // // 发送请求参数
        // out.print(param);
        // // flush输出流的缓冲
        // out.flush();
        // // 定义BufferedReader输入流来读取URL的响应
        // in = new BufferedReader(
        // new InputStreamReader(conn.getInputStream()));
        // String line;
        // while ((line = in.readLine()) != null) {
        // result += line;
        // }
        // } catch (Exception e) {
        // System.out.println("发送 POST 请求出现异常！"+e);
        // e.printStackTrace();
        // }
        // //使用finally块来关闭输出流、输入流
        // finally{
        // try{
        // if(out!=null){
        // out.close();
        // }
        // if(in!=null){
        // in.close();
        // }
        // }
        // catch(IOException ex){
        // ex.printStackTrace();
        // }
        // }
        // return result;
        try {
            // 建立连接
            URL url = new URL(pathUrl);
            HttpURLConnection httpConn = (HttpURLConnection) url.openConnection();
 
            // //设置连接属性
            httpConn.setDoOutput(true);// 使用 URL 连接进行输出
            httpConn.setDoInput(true);// 使用 URL 连接进行输入
            httpConn.setUseCaches(false);// 忽略缓存
            httpConn.setRequestMethod("POST");// 设置URL请求方法
            String requestString = "客服端要以以流方式发送到服务端的数据...";
 
            // 设置请求属性
            // 获得数据字节数据，请求数据流的编码，必须和下面服务器端处理请求流的编码一致
            byte[] requestStringBytes = requestString.getBytes("utf-8");
            httpConn.setRequestProperty("Content-length", "" + requestStringBytes.length);
            httpConn.setRequestProperty("Content-Type", "   application/x-www-form-urlencoded");
            httpConn.setRequestProperty("Connection", "Keep-Alive");// 维持长连接
            httpConn.setRequestProperty("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
            httpConn.setRequestProperty("Accept-Encoding", "gzip, deflate");
            httpConn.setRequestProperty("Accept-Language", "zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3");
            httpConn.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:49.0) Gecko/20100101 Firefox/49.0");
            httpConn.setRequestProperty("Upgrade-Insecure-Requests", "1");
 
            httpConn.setRequestProperty("account", name);
            httpConn.setRequestProperty("passwd", pwd);
            httpConn.setRequestProperty("phone", phone);
            httpConn.setRequestProperty("content", content);
 
            // 建立输出流，并写入数据
            OutputStream outputStream = httpConn.getOutputStream();
            outputStream.write(requestStringBytes);
            outputStream.close();
            // 获得响应状态
            int responseCode = httpConn.getResponseCode();
 
            if (HttpURLConnection.HTTP_OK == responseCode) {// 连接成功
                // 当正确响应时处理数据
                StringBuffer sb = new StringBuffer();
                String readLine;
                BufferedReader responseReader;
                // 处理响应流，必须与服务器响应流输出的编码一致
                responseReader = new BufferedReader(new InputStreamReader(httpConn.getInputStream(), "utf-8"));
                while ((readLine = responseReader.readLine()) != null) {
                    sb.append(readLine).append("\n");
                }
                responseReader.close();
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }
 
    /**
     * 执行一个HTTP POST请求，返回请求响应的HTML
     *
     * @param url
     *            请求的URL地址
     * @param params
     *            请求的查询参数,可以为null
     * @return 返回请求响应的HTML
     */
    public static void doPost(String url, String name, String pwd, String phone, String content) {
        // 创建默认的httpClient实例.
        CloseableHttpClient httpclient = HttpClients.createDefault();
        // 创建httppost
        HttpPost httppost = new HttpPost(url);
        // 创建参数队列
        List<NameValuePair> formparams = new ArrayList<NameValuePair>();
        formparams.add(new BasicNameValuePair("account", name));
        formparams.add(new BasicNameValuePair("passwd", pwd));
        formparams.add(new BasicNameValuePair("phone", phone));
        formparams.add(new BasicNameValuePair("content", content));
 
        UrlEncodedFormEntity uefEntity;
        try {
            uefEntity = new UrlEncodedFormEntity(formparams, "UTF-8");
            httppost.setEntity(uefEntity);
            System.out.println("executing request " + httppost.getURI());
            CloseableHttpResponse response = httpclient.execute(httppost);
            try {
                HttpEntity entity = response.getEntity();
                if (entity != null) {
                    System.out.println("--------------------------------------");
                    System.out.println("Response content: " + EntityUtils.toString(entity, "UTF-8"));
                    System.out.println("--------------------------------------");
                }
            } finally {
                response.close();
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            // 关闭连接,释放资源
            try {
                httpclient.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
 
    }
}