Android应用程序中创建一个http服务器

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;    @Override    public 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+"");    }    @Override    public 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());        }    }    @Override    public 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");    }    @Override    public 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

Hello server

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