socket通信需要有一个服务器和客户端,可以把同一个APP作为服务器跟客户端,也可以分开成两个APP。
先上个图:
这里以一个APP作为服务器跟客户端为示例
1、添加网络访问权限
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< uses-permission android:name = "android.permission.INTERNET" /> |
2、写服务器,在APP上启动
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import java.io.DataInputStream; import java.io.DataOutputStream; import java.io.IOException; import java.net.InetAddress; import java.net.ServerSocket; import java.net.Socket; public class Server { ServerSocket serverSocket = null ; public final int port = 9998 ; private int i = 0 ; public Server(){ //输出服务器的IP地址 try { InetAddress addr = InetAddress.getLocalHost(); System.out.println( "local host:" +addr); serverSocket = new ServerSocket(port); System.out.println( "0k" ); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } public void startService(){ try { Socket socket = null ; System.out.println( "waiting..." ); //等待连接,每建立一个连接,就新建一个线程 while ( true ){ socket = serverSocket.accept(); //等待一个客户端的连接,在连接之前,此方法是阻塞的 System.out.println( "connect to" +socket.getInetAddress()+ ":" +socket.getLocalPort()); new ConnectThread(socket).start(); } } catch (IOException e) { // TODO Auto-generated catch block System.out.println( "IOException" ); e.printStackTrace(); } } //向客户端发送信息 class ConnectThread extends Thread{ Socket socket = null ; public ConnectThread(Socket socket){ super (); this .socket = socket; } @Override public void run(){ try { DataInputStream dis = new DataInputStream(socket.getInputStream()); DataOutputStream dos = new DataOutputStream(socket.getOutputStream()); while ( true ){ i++; String msgRecv = dis.readUTF(); System.out.println( "msg from client:" +msgRecv); dos.writeUTF(msgRecv + i); dos.flush(); } } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } } |
需要在线程中调用,调用方法:
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new Thread(() -> new Server().startService()).start(); |
3、客户端代码
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import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.widget.Button; import android.widget.EditText; import android.widget.TextView; import android.widget.Toast; import java.io.DataInputStream; import java.io.DataOutputStream; import java.io.IOException; import java.net.InetAddress; import java.net.Socket; import java.net.UnknownHostException; import androidx.appcompat.app.AppCompatActivity; /** * @author fenghaitao * @time 2020年4月2日14:34:33 * scoket客户端连接测试 */ public class SocketActivity extends AppCompatActivity { //IP地址和端口号 public static String IP_ADDRESS = "" ; public static int PORT = 9998 ; //三个控件 EditText et_message = null ; //需要发送的内容 Button bt_getAdress = null ; //获取本机IP地址 Button bt_connect = null ; //连接并发送 Button bt_startServer = null ; //启动服务端 TextView tv_adress = null ; //ip地址 TextView tv_reply = null ; //服务器回复的消息 //handler Handler handler = null ; Socket soc = null ; DataOutputStream dos = null ; DataInputStream dis = null ; String messageRecv = null ; @Override protected void onCreate(Bundle savedInstanceState) { super .onCreate(savedInstanceState); setContentView(R.layout.activity_socket); et_message = findViewById(R.id.et_message); bt_getAdress = findViewById(R.id.bt_getAdress); bt_connect = findViewById(R.id.bt_connect); bt_startServer = findViewById(R.id.bt_startServer); tv_adress = findViewById(R.id.tv_adress); tv_reply = findViewById(R.id.tv_reply); bt_getAdress.setOnClickListener(v -> { new Thread(() -> { try { InetAddress addr = InetAddress.getLocalHost(); System.out.println( "local host:" +addr); runOnUiThread(() -> tv_adress.setText(addr.toString().split( "/" )[ 1 ])); } catch (UnknownHostException e) { e.printStackTrace(); } }).start(); }); bt_startServer.setOnClickListener(v -> { new Thread(() -> new Server().startService()).start(); Toast.makeText(SocketActivity. this , "服务已启动" ,Toast.LENGTH_SHORT).show(); }); bt_connect.setOnClickListener(v -> { IP_ADDRESS = tv_adress.getText().toString(); new ConnectionThread(et_message.getText().toString()).start(); }); handler = new Handler(msg -> { Bundle b = msg.getData(); //获取消息中的Bundle对象 String str = b.getString( "data" ); //获取键为data的字符串的值 tv_reply.append(str); return false ; }); } //新建一个子线程,实现socket通信 class ConnectionThread extends Thread { String message = null ; public ConnectionThread(String msg) { message = msg; } @Override public void run() { if (soc == null ) { try { //Log.d("socket","new socket"); if ( "" .equals(IP_ADDRESS)) { return ; } soc = new Socket(IP_ADDRESS, PORT); //获取socket的输入输出流 dis = new DataInputStream(soc.getInputStream()); dos = new DataOutputStream(soc.getOutputStream()); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } try { dos.writeUTF(message); dos.flush(); messageRecv = dis.readUTF(); //如果没有收到数据,会阻塞 Message msg = new Message(); Bundle b = new Bundle(); b.putString( "data" , messageRecv); msg.setData(b); handler.sendMessage(msg); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } } |
下面是xml页面代码
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<? xml version = "1.0" encoding = "utf-8" ?> < LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android" xmlns:app = "http://schemas.android.com/apk/res-auto" xmlns:tools = "http://schemas.android.com/tools" android:layout_width = "match_parent" android:layout_height = "match_parent" tools:context = ".SocketActivity" > < LinearLayout android:layout_width = "match_parent" android:layout_height = "match_parent" android:orientation = "vertical" > < LinearLayout android:layout_width = "match_parent" android:layout_height = "wrap_content" android:layout_marginTop = "10dp" > < Button android:id = "@+id/bt_getAdress" android:layout_width = "wrap_content" android:layout_height = "wrap_content" android:text = "获取IP地址" /> < TextView android:id = "@+id/tv_adress" android:layout_width = "200dp" android:layout_height = "match_parent" android:layout_marginLeft = "15dp" android:textSize = "20dp" android:gravity = "center" /> </ LinearLayout > < Button android:id = "@+id/bt_startServer" android:text = "启动服务" android:layout_marginTop = "10dp" android:layout_width = "wrap_content" android:layout_height = "wrap_content" /> < EditText android:id = "@+id/et_message" android:layout_marginTop = "10dp" android:hint = "请输入发送信息" android:layout_width = "wrap_content" android:layout_height = "wrap_content" /> < Button android:id = "@+id/bt_connect" android:text = "连接发送" android:layout_marginTop = "10dp" android:layout_width = "wrap_content" android:layout_height = "wrap_content" /> < TextView android:id = "@+id/tv_reply" android:layout_width = "wrap_content" android:layout_height = "wrap_content" android:layout_marginTop = "10dp" android:text = "服务端返回消息:" android:textSize = "30sp" /> </ LinearLayout > </ LinearLayout > |
客户端跟服务器进行通信之前记得先启动服务器,如果端口被占用需要换个端口。