tcp；Android app 和PC服务器端

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.myapplication2">
    <uses-permission android:name="android.permission.INTERNET"/>
    <application
        android: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>

package com.example.myapplication2;
import android.annotation.SuppressLint;
import android.os.Handler;
import android.os.Message;
//import android.support.v7.app.AppCompatActivity;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.text.method.ScrollingMovementMethod;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private Button bt_conn, bt_send, bt_clear;
    private EditText et_ip, et_port, et_msg;
    private TextView tv_data;

    TCPClient tcpClient;
    Message message;
    @SuppressLint("HandlerLeak")
    Handler handler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
                case 1:
                    tv_data.append("接收消息：" + msg.obj.toString() + "\n");
                    break;
                case 2:
                    tv_data.append("发送消息：" + msg.obj.toString() + "\n");
                    break;
                case 3:
                    Toast.makeText(MainActivity.this, "TCP连接成功！", Toast.LENGTH_SHORT).show();
                    bt_send.setEnabled(true);
                    break;
            }
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
        Clickbt();
        tcpClient = new TCPClient(handler);
    }

    private void Clickbt() {
        bt_conn.setOnClickListener(this);
        bt_send.setOnClickListener(this);
        bt_clear.setOnClickListener(this);
    }

    private void initView() {
        bt_conn = findViewById(R.id.bt_conn);
        bt_send = findViewById(R.id.bt_send);
        bt_send.setEnabled(false);
        bt_clear = findViewById(R.id.bt_clear);
        et_ip = findViewById(R.id.et_ip);
        et_port = findViewById(R.id.et_port);
        et_msg = findViewById(R.id.et_msg);
        tv_data = findViewById(R.id.tv_data);
        tv_data.setMovementMethod(ScrollingMovementMethod.getInstance());
    }

    @Override
    public void onClick(View view) {
        switch (view.getId()) {
            case R.id.bt_conn:
                new Thread(new Runnable() {
                    @Override
                    public void run() {
                        try {
                            tcpClient.conntcp(et_ip.getText().toString(), Integer.parseInt(et_port.getText().toString()));
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
                    }
                }).start();
                break;
            case R.id.bt_send:
                tcpClient.send(et_msg.getText().toString());
                break;
            case R.id.bt_clear:
                tv_data.setText("");
                break;
        }
    }

}

MainActivity.java

 

TCPClient.java

 

package com.example.myapplication2;

import android.os.Handler;
import android.os.Message;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;

public class TCPClient {
    Socket socket;
    InputStream inputStream;
    OutputStream outputStream;
    Message message;
    Handler handler;

    public TCPClient(Handler handler) {
        this.handler = handler;
    }

    public void conntcp(String ip, int port) throws IOException {
        socket = new Socket(ip, port);
        inputStream = socket.getInputStream();
        outputStream = socket.getOutputStream();
        message = new Message();
        message.what = 3;//连接成功
        handler.sendMessage(message);
        accept();
    }

    private void accept() throws IOException {
        while (true) {
            byte[] byte1 = new byte[1024];
            int i = inputStream.read(byte1);
            byte[] byte2 = new byte[i];
            System.arraycopy(byte1, 0, byte2, 0, i);
            String s = new String(byte2, "UTF-8");
            message = new Message();
            message.what = 1;//接收
            message.obj = s;
            handler.sendMessage(message);
        }
    }

    public void send(final String s) {
        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    String ss = s + "\n";
                    byte[] bytes = ss.getBytes();
                    outputStream.flush();
                    outputStream.write(bytes);
                    message = new Message();
                    message.what = 2;//发送
                    message.obj = s;
                    handler.sendMessage(message);
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }).start();

    }

}

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">

    <Button
        android:id="@+id/bt_send"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="78dp"
        android:layout_marginTop="162dp"
        android:text="@string/send"
        app:layout_constraintStart_toEndOf="@+id/bt_conn"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/bt_conn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="24dp"
        android:layout_marginTop="28dp"
        android:text="@string/conn"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/et_port" />

    <EditText
        android:id="@+id/et_ip"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="25dp"
        android:layout_marginTop="42dp"
        android:ems="10"
        android:inputType="textPersonName"
        android:text="@string/_127_0_0_1"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <EditText
        android:id="@+id/et_port"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="26dp"
        android:layout_marginTop="10dp"
        android:ems="10"
        android:inputType="textPersonName"
        android:text="@string/_8080"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/et_ip" />

    <EditText
        android:id="@+id/et_msg"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="20dp"
        android:layout_marginTop="53dp"
        android:ems="10"
        android:inputType="textPersonName"
        android:text="test data android"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/bt_send" />

    <TextView
        android:id="@+id/tv_data"
        android:layout_width="273dp"
        android:layout_height="203dp"
        android:layout_marginStart="41dp"
        android:layout_marginTop="34dp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/et_msg" />

    <Button
        android:id="@+id/bt_clear"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="133dp"
        android:layout_marginBottom="31dp"
        android:text="@string/clear"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

String.xml

<resources>
    <string name="app_name">My Application2</string>
    <string name="send">send</string>
    <string name="conn">conn</string>
    <string name="_127_0_0_1">http://127.0.0.1</string>
    <string name="_8080">8080</string>
    <string name="clear">清屏</string>
</resources>

其他均保持默认数据即可

 

增加build.gradle配置

apply plugin: 'com.android.application'

android {
    compileSdkVersion 30
    buildToolsVersion "30.0.2"

    defaultConfig {
        applicationId "com.example.myapplication2"
        minSdkVersion 19
        targetSdkVersion 30
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: "libs", include: ["*.jar"])
    implementation 'androidx.appcompat:appcompat:1.2.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.0.1'
    //noinspection GradleCompatible
    implementation 'com.android.support:appcompat-v7:28.0.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test.ext:junit:1.1.2'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'

}

 

本文地址：https://blog.csdn.net/Llingmiao/article/details/108736967