Android Studio实现socket客户端与服务器通信
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Android Studio

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服务器端

权限

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

Activity_Main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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=".MainActivity">


    <TextView
        android:id="@+id/textView"
        android:layout_width="355dp"
        android:layout_height="398dp"
        android:layout_marginTop="24dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <EditText
        android:id="@+id/edittext1"
        android:layout_width="185dp"
        android:layout_height="49dp"
        android:layout_marginBottom="116dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.497"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView"
        app:layout_constraintVertical_bias="1.0" />

    <Button
        android:id="@+id/button"
        android:layout_width="67dp"
        android:layout_height="44dp"
        android:onClick="start_serv"
        android:text="开启"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="@+id/edittext1"
        app:layout_constraintTop_toBottomOf="@+id/edittext1"
        app:layout_constraintVertical_bias="0.247" />

    <Button
        android:id="@+id/button2"
        android:layout_width="67dp"
        android:layout_height="44dp"
        android:onClick="close_server"
        android:text="关闭"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="@+id/edittext1"
        app:layout_constraintTop_toBottomOf="@+id/edittext1"
        app:layout_constraintVertical_bias="0.247" />

    <EditText
        android:id="@+id/edittext2"
        android:layout_width="199dp"
        android:layout_height="41dp"
        android:layout_marginBottom="68dp"
        app:layout_constraintBottom_toTopOf="@+id/edittext1"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent" />

    <Button
        android:id="@+id/button3"
        android:layout_width="83dp"
        android:layout_height="44dp"
        android:onClick="send"
        android:text="发送"
        app:layout_constraintBottom_toTopOf="@+id/edittext1"
        app:layout_constraintEnd_toEndOf="@+id/edittext2"
        app:layout_constraintStart_toStartOf="@+id/edittext2"
        app:layout_constraintTop_toBottomOf="@+id/edittext2"
        app:layout_constraintVertical_bias="0.099" />

    <TextView
        android:id="@+id/textView4"
        android:layout_width="28dp"
        android:layout_height="21dp"
        android:text="port"
        app:layout_constraintBottom_toBottomOf="@+id/edittext1"
        app:layout_constraintEnd_toStartOf="@+id/edittext1"
        app:layout_constraintTop_toTopOf="@+id/edittext1" />
</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.java

package com.example.server;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import android.Manifest;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;

public class MainActivity extends AppCompatActivity {
    private ServerSocket server;
    private Socket socket;
    private DataInputStream in;
    private String txt="";
    private Handler handler;
    private DataOutputStream out;
    private static String[] PERMISSIONS_STORAGE = {
            //依次权限申请
            Manifest.permission.ACCESS_WIFI_STATE,
            Manifest.permission.INTERNET
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        applypermission();
        //权限申请
        handler = new Handler(){
            //handler用于处理更新组件属性
            @Override
            public void handleMessage(@NonNull Message msg) {
                super.handleMessage(msg);
                if(msg.what==1){
                    //判断消息
                    final TextView textview = (TextView) findViewById(R.id.textView);
                    //获取文本组件 TextView
                    textview.append(txt);
                }else if(msg.what==2){
                    final TextView textview = (TextView) findViewById(R.id.textView);
                    final EditText edittext = (EditText) findViewById(R.id.edittext2);
                    textview.append("服务器:"+edittext.getText()+"\n");
                    edittext.setText("");
                }
            }
        };
    }

    public void start_serv(View view){
        //启动服务器
        server_start.start();
    }
    public void close_server(View view){
        //关闭服务器
        try {
            server.close();
            socket.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void send(View view){
        //发送消息
        send_message.start();
    }

    Thread send_message = new Thread(
            //构建发送消息线程
            new Runnable() {
                @Override
                public void run() {
                    try {
                        final EditText edittext = (EditText) findViewById(R.id.edittext2);
                        //获取组件
                        out.writeUTF("服务器:"+edittext.getText().toString());
                        handler.sendEmptyMessage(2);
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            }
    );

    Thread server_start = new Thread(
            //构造线程启动socket通信 获取客户端发送的内容
            new Runnable() {
                public void run() {
                    try {
                        final EditText edittext = (EditText) findViewById(R.id.edittext1);
                        //获取组件
                        server = new ServerSocket(Integer.valueOf(edittext.getText().toString()));
                        //设置端口
                        socket = server.accept();
                        //创建一个socket连接对象socket，等待服务器有客户端访问
                        //server.accept();调用服务器的server的接受方法
                        in = new DataInputStream(socket.getInputStream());
                        out=new DataOutputStream(socket.getOutputStream());
                        // 创建DataOutputStream对象 发送数据
                    } catch (Exception e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                    while(true) {
                        try {
                            txt = in.readUTF()+"\n";
                            handler.sendEmptyMessage(1);
                            //发送空消息  1主要为了区分消息好执行改变组件信息的内容
                        } catch (Exception e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        }
                    }
                }
            });

    //定义判断权限申请的函数，在onCreat中调用就行
    public void applypermission(){
        if(Build.VERSION.SDK_INT>=23){
            boolean needapply=false;
            for(int i=0;i<PERMISSIONS_STORAGE.length;i++){
                int chechpermission= ContextCompat.checkSelfPermission(getApplicationContext(),
                        PERMISSIONS_STORAGE[i]);
                if(chechpermission!= PackageManager.PERMISSION_GRANTED){
                    needapply=true;
                }
            }
            if(needapply){
                ActivityCompat.requestPermissions(MainActivity.this,PERMISSIONS_STORAGE,1);
            }
        }
    }
}

客户端

权限

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

Activity_Main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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=".MainActivity">


    <EditText
        android:id="@+id/edittext"
        android:layout_width="186dp"
        android:layout_height="40dp"
        app:layout_constraintBottom_toTopOf="@+id/edittext2"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.568"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/button3"
        app:layout_constraintVertical_bias="1.0" />

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="28dp"
        android:onClick="connection"
        android:text="连接"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.346"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/edittext2" />

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="28dp"
        android:onClick="stop"
        android:text="断开"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.081"
        app:layout_constraintStart_toEndOf="@+id/button"
        app:layout_constraintTop_toBottomOf="@+id/edittext2" />

    <TextView
        android:id="@+id/textView1"
        android:layout_width="40dp"
        android:layout_height="30dp"
        android:text="ipv4"
        android:textSize="18sp"
        app:layout_constraintBottom_toBottomOf="@+id/edittext"
        app:layout_constraintEnd_toStartOf="@+id/edittext"
        app:layout_constraintTop_toTopOf="@+id/edittext"
        app:layout_constraintVertical_bias="1.0" />

    <EditText
        android:id="@+id/edittext2"
        android:layout_width="186dp"
        android:layout_height="40dp"
        android:layout_marginTop="470dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.568"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.199" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="38dp"
        android:layout_height="31dp"
        android:text="port"
        android:textSize="18sp"
        app:layout_constraintBottom_toBottomOf="@+id/edittext2"
        app:layout_constraintEnd_toStartOf="@+id/edittext2"
        app:layout_constraintTop_toTopOf="@+id/edittext2"
        app:layout_constraintVertical_bias="1.0" />

    <TextView
        android:id="@+id/textView3"
        android:layout_width="357dp"
        android:layout_height="251dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.326"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.071" />

    <EditText
        android:id="@+id/edittext3"
        android:layout_width="255dp"
        android:layout_height="43dp"
        android:layout_marginTop="56dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView3" />

    <Button
        android:id="@+id/button3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="sentxt"
        android:text="发送"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/edittext3" />
</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.java

package com.example.customer;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import android.Manifest;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.Socket;

public class MainActivity extends AppCompatActivity {
    private DataInputStream in;
    private Socket socket;
    private Handler handler;
    private DataOutputStream out;
    private String txt="";
    private static String[] PERMISSIONS_STORAGE = {
            //依次权限申请
            Manifest.permission.INTERNET
    };
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        applypermission();
        //权限申请

        handler = new Handler(){
            @Override
            public void handleMessage(@NonNull Message msg) {
                super.handleMessage(msg);
                if(msg.what==24){
                    final EditText edittext3 = (EditText) findViewById(R.id.edittext3);
                    final TextView textview3 = (TextView) findViewById(R.id.textView3);
                    //获取组件
                    textview3.append("客户端:"+edittext3.getText().toString()+"\n");
                    edittext3.setText("");
                }else if(msg.what==98){
                    final TextView textview3 = (TextView) findViewById(R.id.textView3);
                    //获取组件
                    textview3.append(txt);
                }
            }
        };
    }

    public void connection(View view){
        connection.start();
    }

    public void stop(View view){
        try {
            socket.close();//关闭流
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    Thread connection = new Thread(
            //连接服务器
            new Runnable() {
                @Override
                public void run() {
                    try {
                        final EditText edittext = (EditText) findViewById(R.id.edittext);
                        final EditText edittext2 = (EditText) findViewById(R.id.edittext2);
                        //获取编辑框组件
                        socket = new Socket(edittext.getText().toString(), Integer.valueOf(edittext2.getText().toString()));
                        //连接服务器
                        out=new DataOutputStream(socket.getOutputStream());
                        // 创建DataOutputStream对象 发送数据
                        in = new DataInputStream(socket.getInputStream());
                    } catch (Exception e) {
                        // TODO Auto-generatetd catch block
                        e.printStackTrace();
                    }
                    while(true) {
                        try {
                            txt = in.readUTF()+"\n";
                            handler.sendEmptyMessage(98);
                            //发送空消息  1主要为了区分消息好执行改变组件信息的内容
                        } catch (Exception e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        }
                    }

                }
            }
    );

    public void sentxt(View view){
        sendmessage.start();
        handler.sendEmptyMessage(24);
        //发送空消息  数字主要为了区分消息好执行改变组件信息的内容
    }

    Thread sendmessage = new Thread(
            new Runnable() {
                @Override
                public void run() {
                    final EditText edittext3 = (EditText) findViewById(R.id.edittext3);
                    //获取组件
                    try {
                        out.writeUTF("客户端:"+edittext3.getText().toString());
                        //发送消息
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
    );

    //定义判断权限申请的函数，在onCreat中调用就行
    public void applypermission(){
        if(Build.VERSION.SDK_INT>=23){
            boolean needapply=false;
            for(int i=0;i<PERMISSIONS_STORAGE.length;i++){
                int chechpermission= ContextCompat.checkSelfPermission(getApplicationContext(),
                        PERMISSIONS_STORAGE[i]);
                if(chechpermission!= PackageManager.PERMISSION_GRANTED){
                    needapply=true;
                }
            }
            if(needapply){
                ActivityCompat.requestPermissions(MainActivity.this,PERMISSIONS_STORAGE,1);
            }
        }
    }
}

评论

  1. 苍有归途
    3年前
    2021-4-07 20:46:15

    只能一发一收两次，再发送就闪退了是怎么回事？

    • linowl 博主
      3年前
      2021-4-08 14:38:23

      你看看报错是什么情况，我这边调试的时候基本没这种情况的

  4. 爱心无敌
    3年前
    2021-8-18 10:01:51

    博主你好，最近在学安卓开发，APP连接自带WIFI的设备，可以用socket建立通信读取设备内的内存卡吗？

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