Java - 网络工具包

package com.boob.common.utils;

import org.springframework.util.MultiValueMap;
import org.springframework.web.util.UriComponentsBuilder;

import javax.net.ssl.HttpsURLConnection;
import javax.servlet.http.HttpServletRequest;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.*;

/**
 * @description：网络工具包
 * @author：boob
 * @since：2020/2/7
 */
public class NetUtils {

	public NetUtils() {
	}

	/**
	 * 根据url和请求参数获取URI
	 */
	public static URI getURIwithParams(String url, MultiValueMap<String, String> params) {
		UriComponentsBuilder builder = UriComponentsBuilder.fromHttpUrl(url).queryParams(params);
		return builder.build().encode().toUri();
	}

	/**
	 * 获取请求中的IP
	 *
	 * @param request
	 * @return
	 */
	public static String getIpAddress(HttpServletRequest request) {
		String[] ipHeaders = {"x-forwarded-for", "Proxy-Client-IP", "WL-Proxy-Client-IP", "HTTP_CLIENT_IP", "HTTP_X_FORWARDED_FOR"};
		String[] localhostIp = {"127.0.0.1", "0:0:0:0:0:0:0:1"};
		String ip = request.getRemoteAddr();
		for (String header : ipHeaders) {
			if (ip != null && ip.length() != 0 && !"unknown".equalsIgnoreCase(ip)) {
				break;
			}
			ip = request.getHeader(header);
		}
		for (String local : localhostIp) {
			if (ip != null && ip.equals(local)) {
				try {
					ip = InetAddress.getLocalHost().getHostAddress();
				} catch (UnknownHostException ignored) {
				}
				break;
			}
		}
		if (ip != null && ip.length() > 15 && ip.contains(",")) {
			ip = ip.substring(0, ip.indexOf(','));
		}
		return ip;
	}

	/**
	 * IP转Integer
	 *
	 * @param ip
	 * @return
	 */
	public static Integer ipToInteger(String ip) {
		String[] ips = ip.split("\\.");
		int ipFour = 0;
		for (String ip4 : ips) {
			Integer ip4a = Integer.parseInt(ip4);
			ipFour = (ipFour << 8) | ip4a;
		}
		return ipFour;
	}

	/**
	 * Integer转IP
	 *
	 * @param ip
	 * @return
	 */
	public static String IntegerToIp(Integer ip) {
		StringBuilder sb = new StringBuilder();
		for (int i = 3; i >= 0; i--) {
			int ipa = (ip >> (8 * i)) & (0xff);
			sb.append(ipa + ".");
		}
		sb.delete(sb.length() - 1, sb.length());
		return sb.toString();
	}

	/**
	 * IP地址是否可达
	 * @param ip
	 * @return boolean
	 */
	public static boolean isReachable(String ip) {
		InetAddress address;
		try {
			address = InetAddress.getByName(ip);
			if (address.isReachable(5000)) {
				return true;
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
		return false;
	}

	/**
	 * 判断网址是否有效<br>
	 * <b>注意</b> 对于404页面，如果被电信或者联通劫持了，也会返回200的状态，这个是不准确的
	 * @param url URL对象
	 * @return boolean
	 */
	public static boolean isReachable(URL url){
		
		boolean reachable=false;
		HttpURLConnection httpconn=null;
		HttpsURLConnection httpsconn=null;
		int code=0;
		
		try {
			if(url.getProtocol().equals("https")){
				httpsconn=(HttpsURLConnection)url.openConnection();
				code=httpsconn.getResponseCode();
			}else{
				httpconn=(HttpURLConnection)url.openConnection();
				code=httpconn.getResponseCode();
			}
			System.out.println(code);
			if(code==200){
				reachable=true;
			}
		} catch (Exception e) {
			reachable=false;
		}
		
		return reachable;
	}
	
	/**
	 * 实现Ping命令
	 * @param ip
	 * @return Ping的字符串换行使用java的换行符"\n"，如果ping不同返回null
	 */
	public static String ping(String ip) {
		String res = "";
		String line = null;
		try {
			Process pro = Runtime.getRuntime().exec("ping " + ip);
			BufferedReader buf = new BufferedReader(new InputStreamReader(pro.getInputStream(), "GBK"));
			while ((line = buf.readLine()) != null) {
				if (!line.equals("")) {
					res+=String.valueOf(line)+"\n";
				}
			}
		} catch (Exception e) {
			res = null;
		}
		return res;
	}

}