Update

src/Network_communication/IpToName.java

+package Network_communication;
+
+// !/usr/bin/env jdk1.8
+// encoding:utf-8
+//@software:IntelliJ IDEA
+//@pack:Network_communication
+//@user:彭友聪
+//@date:2019/07/18
+//@time:下午 4:24
+//@project:IDEA_JAVA
+//@file:IpToName.java
+//Author:御承扬
+//email:2923616405@qq.com
+
+import java.io.IOException;
+import java.net.InetAddress;
+import java.net.UnknownHostException;
+
+
+public class IpToName {
+    private IpToName() {
+
+    }
+
+    public static void main(String[] args) throws IOException {
+        String IP;
+        InetAddress host; // 创建 InetAddress 对象
+        try {
+            host = InetAddress.getLocalHost(); // 实例化 InetAddress 对象，获取本机的 IP 地址相关信息
+            String localName = host.getHostName(); // 获取本机名
+            String localIp = host.getHostAddress();
+            System.out.println( "本机名:" + localName + ",本机 IP 地址：" + localIp );
+        } catch (UnknownHostException e) {
+            e.printStackTrace();
+        }
+
+        for (int i = 100; i <= 120; i++) {
+            IP = "192.168.0." + i;
+            try {
+                host = InetAddress.getByName( IP );
+                if( host.isReachable( 2000 )) { // 用两秒的时间测试 IP 是否可达
+                    String hostName = host.getHostName(); // 获取指定 IP 地址的主机名
+                    System.out.println( "IP 地址："+IP+"的主机名称："+hostName );
+                }
+            } catch ( UnknownHostException e) {
+                e.printStackTrace();
+            }
+        }
+        System.out.println( "搜寻完毕！！" );
+    }
+}