Android Socket编程与客户端通信

Android Socket编程与客户端通信

云服务器

阿里云上云优惠

环境

Android Studio
JDK 14
阿里云服务器

Android客户端

activity_main.xml

src/main/res/layout/activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android=""xmlns:app=""xmlns:tools=""android:layout_width="match_parent"android:layout_height="match_parent"tools:context=".MainActivity"><Buttonandroid:id="@+id/button"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="Socket"app:layout_constraintBottom_toBottomOf="parent"app:layout_constraintLeft_toLeftOf="parent"app:layout_constraintRight_toRightOf="parent"app:layout_constraintTop_toTopOf="parent" /></android.support.constraint.ConstraintLayout>

MainActivity.java

src/main/res/layout/activity_main.xml

package com.demo.socket;import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;public class MainActivity extends AppCompatActivity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);Button button = (Button) findViewById(R.id.button);final String host_name = this.getString(R.string.host_name);final int port = Integer.parseInt(this.getString(R.string.port));button.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {new Thread() {@Overridepublic void run() {Socket socket = null;try {OutputStream outputStream = socket.getOutputStream();DataOutputStream dataOutputStream = new DataOutputStream(outputStream);dataOutputStream.writeUTF("Hello World!");InputStream inFromServer = socket.getInputStream();DataInputStream dataInputStream = new DataInputStream(inFromServer);System.out.println("Server response: " + dataInputStream.readUTF());} catch (IOException e) {e.printStackTrace();} finally {try {socket.close();} catch (IOException e) {e.printStackTrace();}}}}.start();}});}
}

AndroidManifest.xml

src/main/AndroidManifest.xml

添加下列语句以授权互联网访问权限

<uses-permission android:name="android.permission.INTERNET" />

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android=""package="com.demo.socket"><uses-permission android:name="android.permission.INTERNET" /><applicationandroid:allowBackup="true"android:icon="@mipmap/ic_launcher"android:label="@string/app_name"android:roundIcon="@mipmap/ic_launcher_round"android:supportsRtl="true"android:theme="@style/AppTheme"><activity android:name=".MainActivity"><intent-filter><action android:name="android.intent.action.MAIN" /><category android:name="android.intent.category.LAUNCHER" /></intent-filter></activity></application></manifest>

strings.xml

src/main/res/values/strings.xml

其中<host_name>为服务器公网IP，<port>为端口号，需与服务器端设置的端口号一致

<resources><string name="app_name">Socket</string><string name="host_name"><host_name></string><string name="port"><port></string>
</resources>

服务器端

其中<port>为端口号，需与客户端一致

import java.net.*;
import java.io.*;public class Server {private static ServerSocket serverSocket;public static void main(String[] args) {int port = <port>;new Thread() {@Overridepublic void run() {System.out.println("Waiting to connect...");try {serverSocket = new ServerSocket(port);serverSocket.setSoTimeout(10000);} catch(SocketTimeoutException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}while (true) {Socket server = null;try {server = serverSocket.accept();DataInputStream dataInputStream = new DataInputStream(server.getInputStream());System.out.println("Receive " + dataInputStream.readUTF());DataOutputStream dataOutputStream = new DataOutputStream(server.getOutputStream());dataOutputStream.writeUTF("Receive successfully!");} catch (SocketTimeoutException e) {System.out.println("Time out!");} catch (IOException e) {e.printStackTrace();}}}}.start();}
}

测试结果

客户端

  • UI界面

  • logcat

服务器端

云服务器

使用阿里云、腾讯云服务器需要到对应云服务器安全组开放对应的端口，允许请求IP访问

最后

  • 由于博主水平有限，不免有疏漏之处，欢迎读者随时批评指正，以免造成不必要的误解！