Java.Utils：网络工具包[通俗易懂]

大家好，又见面了，我是你们的朋友全栈君。

Don’t say much, just go to the code.

package org.bood.shimmer.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.*;
/** * 网络工具包 * * @author bood * @since 2020/9/25 */
public class NetUtils { 

private NetUtils() { 

}
/** * <p> * 获取请求中的 IP * </p> * * @param request: * @return：java.lang.String * @author：bood * @date：2020/9/25 */
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;
}
/** * <p> * IP 转 Integer * </p> * * @param ip: IP 地址 * @return：java.lang.Integer * @author：bood * @date：2020/9/25 */
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;
}
/** * <p> * Integer 转 IP * </p> * * @param ip: IP 地址 * @return：java.lang.String * @author：bood * @date：2020/9/25 */
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();
}
/** * <p> * IP 地址是否可达 * </p> * * @param ip: IP 地址 * @return：boolean * @author：bood * @date：2020/9/25 */
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;
}
/** * <p> * 根据 url 和请求参数获取 URI * </p> * * @param url: 请求地址 * @param params: 请求参数 * @return：java.net.URI * @author：bood * @date：2020/9/25 */
public static URI getURIwithParams(String url, MultiValueMap<String, String> params) { 

UriComponentsBuilder builder = UriComponentsBuilder.fromHttpUrl(url).queryParams(params);
return builder.build().encode().toUri();
}
/** * <p> * 判断网址是否有效 * 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 * </p> * * @param url: 请求地址 * @return：boolean * @author：bood * @date：2020/9/25 */
public static boolean isReachable(URL url) { 

boolean reachable = false;
HttpURLConnection httpconn = null;
HttpsURLConnection httpsconn = null;
int code = 0;
try { 

if ("https".equals(url.getProtocol())) { 

httpsconn = (HttpsURLConnection) url.openConnection();
code = httpsconn.getResponseCode();
} else { 

httpconn = (HttpURLConnection) url.openConnection();
code = httpconn.getResponseCode();
}
if (code == 200) { 

reachable = true;
}
} catch (Exception e) { 

reachable = false;
}
return reachable;
}
/** * <p> * 实现 Ping 命令 * Ping 的字符串换行使用 java 的换行符"\n"，如果 ping 不同返回 null * </p> * * @param ip: IP 地址 * @return：java.lang.String * @author：bood * @date：2020/9/25 */
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 (!"".equals(line)) { 

res += line + "\n";
}
}
} catch (Exception e) { 

res = null;
}
return res;
}
}