采用NanoHTTPD框架
想明白原理的，请右转—>原文github地址 :https://github.com/NanoHttpd/nanohttpd

本文主要向您展示如何在Android应用程序中创建一个http服务器。

加入依赖包

   implementation 'org.nanohttpd:nanohttpd:2.3.1'

添加权限申请

主界面程序

mport android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.widget.TextView;import java.io.IOException;
import java.net.SocketException;public class MainActivity extends AppCompatActivity {private MyAppServer mywebserver;private TextView ipAddress;@Overridepublic void onCreate( Bundle savedInstanceState ) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);ipAddress = findViewById(R.id.ipAddress);String localIPAddress = null;try {localIPAddress = GetLocalIp.getLocalIPAddress();} catch (SocketException e) {e.printStackTrace();}ipAddress.setText("当前设备ip地址为："+localIPAddress+":33445");Log.e("localIPAddress",localIPAddress+"");}@Overridepublic void onResume() {super.onResume();try {mywebserver = new MyAppServer(this);Log.e("onResume", "WebServer started");} catch (IOException e) {e.printStackTrace();Log.e("onResume", "WebServer start failed" + e.getMessage());}}@Overridepublic void onPause() {super.onPause();if (mywebserver != null) {mywebserver.closeAllConnections();mywebserver = null;Log.e("onPause", "app pause, so web server close");}}}

server类

import android.content.Context;
import java.io.IOException;
import java.util.Map;
import fi.iki.elonen.NanoHTTPD;public class MyAppServer extends NanoHTTPD {private final static int PORT = 33445;//自定义private Context _mainContext;public MyAppServer(Context context) throws IOException {super(PORT);_mainContext = context;start();System.out.println("\nRunning! Point your browsers to [http://0.0.0.0:33445/](http://localhost:33445/)\n");}@Overridepublic Response serve(IHTTPSession session) {String msg = "
Hello server
\n";Map parms = session.getParms();if (parms.get("username") == null) {msg += "
\n  
Your name: 
\n" + "
\n";} else {msg += "
Hello, " + parms.get("username") + "!
";}return newFixedLengthResponse(msg + "\n");}
}

获取本机ip

import java.net.Inet4Address;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Enumeration;public class GetLocalIp {/*** 获取IP地址* @return* @throws SocketException*/public static String getLocalIPAddress() throws SocketException {for(Enumeration en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements();){NetworkInterface intf = en.nextElement();for(Enumeration enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements();){InetAddress inetAddress = enumIpAddr.nextElement();if(!inetAddress.isLoopbackAddress() && (inetAddress instanceof Inet4Address)){return inetAddress.getHostAddress().toString();}}}return "null";}}

成功在android设备中启动，获取IP后，即可在网站进行访问。

请求后的返回

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