之前写过PC与Android之间通过WIFI通信（通过Socket，可以在博客里面搜索），PC作为主机，Android作为客户机，现在手头有一台仪器通过wifi传输数据，如果仪器作为主机发射WIFI热点信号，Android需要连接到该热点才能进一步进行通信，但是由于主机并没有连接到网络，所以在该种情况下Android设备无法使用网络实现相关的网络服务（比如关键数据的上传，网络数据的获取等等），所以仪器在开始设计的时候将其作为客户端，Android设备作为主机（网上的相关资料大多是将Android设备作为客户端），当Android设备开启热点后，仪器会主动尝试连接固定的热点信息，其中网络SSID和密码已经写死了，所以需要手机端手动修改热点名称：

在开启热点之后，此时手机相当于一个路由器，这个路由器的IP地址是固定的（本人测试过3台Android设备，其默认的路由器地址：192.168.43.1，iPhone的默认路由器地址：172.20.10.1），这个Demo主要实现的目标是Android设备客户端发送信息，服务端接受到信息后再发送信息给客户端。那么Android设备创建的SocketServer代码如下：

只有一个按钮，实现在线程中启动相对应的服务，所以在这里就不上图了，直接放代码：

package com.example.socketserver;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.io.PrintWriter;import java.net.ServerSocket;import java.net.Socket;import java.util.ArrayList;import java.util.List;import android.app.Activity;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.util.Log;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.widget.Button;import android.widget.Toast;import com.koushikdutta.async.callback.CompletedCallback;import com.koushikdutta.async.http.WebSocket;import com.koushikdutta.async.http.WebSocket.StringCallback;import com.koushikdutta.async.http.libcore.RequestHeaders;import com.koushikdutta.async.http.server.AsyncHttpServer;import com.koushikdutta.async.http.server.AsyncHttpServer.WebSocketRequestCallback;import com.koushikdutta.async.http.server.AsyncHttpServerRequest;import com.koushikdutta.async.http.server.AsyncHttpServerResponse;import com.koushikdutta.async.http.server.HttpServerRequestCallback;public class MainActivity extends Activity { private Button btnStart; private ServerSocket serverSocket; private BufferedReader in; private PrintWriter out; private Handler hander = new Handler(){ @Override public void handleMessage(Message msg) { // TODO Auto-generated method stub super.handleMessage(msg); String s = (String)msg.obj; Toast.makeText(MainActivity.this, s, Toast.LENGTH_LONG).show(); } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); btnStart = (Button)findViewById(R.id.button1); btnStart.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub new ServerThread().start();//在新线程中启动SocketServer... } }); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } @Override protected void onStop() { // TODO Auto-generated method stub super.onStop(); } private class ServerThread extends Thread{ @Override public void run() { // TODO Auto-generated method stub super.run(); try {// serverSocket = new ServerSocket(50005);//默认的路由器地址为Address: 192.168.43.1 serverSocket = new ServerSocket(5000); while (true) { Socket clientSocket = serverSocket.accept();//阻塞等待处理... String remoteIP = clientSocket.getInetAddress().getHostAddress(); int remotePort = clientSocket.getLocalPort(); System.out.println("A client connected. IP:" + remoteIP+ ", Port: " + remotePort); System.out.println("server: receiving............."); // 获得 client 端的输入输出流，为进行交互做准备 in = new BufferedReader(new InputStreamReader( clientSocket.getInputStream())); out = new PrintWriter(clientSocket.getOutputStream(), false); // 获得 client 端发送的数据 String tmp = in.readLine(); // String content = new String(tmp.getBytes("utf-8")); System.out.println("Client message is: " + tmp); // 向 client 端发送响应数据 out.println("Your message has been received successfully！."); // 关闭各个流 out.close(); in.close(); Message message = hander.obtainMessage(); message.obj=tmp; hander.sendMessage(message); try { Thread.sleep(100); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }}

客户端实现的代码与网上相关的资料相差无几，比较简单：

package com.example.serverclient;import java.io.BufferedInputStream;import java.io.IOException;import java.io.PrintStream;import java.net.Socket;import java.net.UnknownHostException;import android.app.Activity;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.widget.Button;public class MainActivity extends Activity { private Button sendBtn,sendMessageBtn; private Socket socket; private PrintStream output; private BufferedInputStream bufferedInputStream; private ReadThread readThread; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); sendBtn = (Button) findViewById(R.id.button1); sendMessageBtn = (Button) findViewById(R.id.button2); sendBtn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub new Thread(runnable).start();//开启线程 } }); sendMessageBtn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub sendMessage("hello,i am from client message"); } }); } Runnable runnable = new Runnable() { @Override public void run() { // TODO Auto-generated method stub initClientSocket(); readThread = new ReadThread(); readThread.start(); } }; public void initClientSocket() { try { socket = new Socket("192.168.43.1", 5000); output = new PrintStream(socket.getOutputStream(), true, "gbk"); } catch (UnknownHostException e) { // TODO Auto-generated catch block System.out.println("请检查端口号是否为服务器IP"); e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block System.out.println("服务器未开启"); e.printStackTrace(); } output.println("this is the message from client"); } public byte[] receiveData() { if (socket == null || socket.isClosed()) { try { socket = new Socket("192.168.43.1", 5000); } catch (Exception e) { e.printStackTrace(); } } byte[] data = null; if (socket.isConnected()) { try { bufferedInputStream = new BufferedInputStream(socket.getInputStream()); data = new byte[bufferedInputStream.available()]; bufferedInputStream.read(data); } catch (IOException e) { e.printStackTrace(); } } else { data = new byte[1]; } return data; } private void sendMessage(String str) { output.println(str); } public void closeSocket() { try { output.close(); socket.close(); } catch (IOException e) { System.out.println("error"+e); } } private class ReadThread extends Thread{ @Override public void run() { // TODO Auto-generated method stub super.run(); while (true) { byte[] data = receiveData(); if (data.length > 1) { System.out.println(new String(data)); } } } } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); }}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。