一个很基础的socket链接示例，仅用作测试和学习使用
首先是服务器端的代码，一个标准的socket server，绑定本地的54321端口
package online.geekgalaxy.test;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
public class SocketServer implements Runnable
{
public void run()
{
try
{
//创建ServerSocket
ServerSocket serverSocket = new ServerSocket(54321);
while (true)
{
//接受客户端请求
Socket client = serverSocket.accept();
System.out.println("accept");
try
{
//接收客户端消息
BufferedReader in = new BufferedReader(new InputStreamReader(client.getInputStream()));
String str = in.readLine();
System.out.println("read:" + str);
//向服务器发送消息
PrintWriter out = new PrintWriter( new BufferedWriter( new OutputStreamWriter(client.getOutputStream())),true);
out.println("server message");
//关闭流
out.close();
in.close();
}
catch (Exception e)
{
System.out.println(e.getMessage());
e.printStackTrace();
}
finally
{
//关闭
client.close();
System.out.println("close");
}
}
}
catch (Exception e)
{
System.out.println(e.getMessage());
}
}
//main函数，开启服务器
public static void main(String a[])
{
Thread desktopServerThread = new Thread(new SocketServer());
desktopServerThread.start();
}
}
附加一个python的服务端
#!/usr/bin/python
# -*- coding: UTF-8 -*-
import socket
s = socket.socket()
host = socket.gethostname()
port = 54321
s.bind((host, port))
s.listen(5)
while True:
c, addr = s.accept()
print 'Connect from ', addr
c.send('Welcome！')
c.close()
然后是安卓客户端，很简单，但是连接时不能使用127.0.0.1，所以使用了局域网的10段地址
manifest文件
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="online.geekgalaxy.socketclient">
<uses-permission android:name="android.permission.INTERNET" />
<uses-sdk android:minSdkVersion="5" />
<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>mainactivity文件，使用了一种不是特别推荐的方式在新的API基础上运行socket客户端命令
package online.geekgalaxy.socketclient;
import android.os.StrictMode;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.Socket;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity implements Runnable{
// @Override
// protected void onCreate(Bundle savedInstanceState) {
// super.onCreate(savedInstanceState);
// setContentView(R.layout.activity_main);
// }
private final String DEBUG_TAG = "MainActivity";
private TextView mTextView = null;
private EditText mEditText = null;
private Button mButton = null;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
mButton = (Button)findViewById(R.id.Button01);
mTextView = (TextView)findViewById(R.id.TextView01);
mEditText = (EditText)findViewById(R.id.EditText01);
//登陆
mButton.setOnClickListener(new OnClickListener()
{
public void onClick(View v)
{
run();
}
});
}
@Override
public void run() {
Socket socket = null;
String message = mEditText.getText().toString() + "/r/n";
try {
//创建Socket
// socket = new Socket("192.168.1.110",54321);
socket = new Socket("10.9.3.132", 54321); //IP：10.14.114.127，端口54321
//向服务器发送消息
PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())), true);
out.println(message);
//接收来自服务器的消息
BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
String msg = br.readLine();
if (msg != null) {
mTextView.setText(msg);
} else {
mTextView.setText("数据错误!");
}
//关闭流
out.close();
br.close();
//关闭Socket
socket.close();
} catch (Exception e) {
// TODO: handle exception
Log.e(DEBUG_TAG, e.toString());
}
}
}
mainactivity推荐的写法，使用runnable，是上面代码的替代方案
package online.geekgalaxy.socketclient;
//import android.os.StrictMode;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.Socket;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity{
// @Override
// protected void onCreate(Bundle savedInstanceState) {
// super.onCreate(savedInstanceState);
// setContentView(R.layout.activity_main);
// }
private final String DEBUG_TAG = "MainActivity";
private TextView mTextView = null;
private EditText mEditText = null;
private Button mButton = null;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
// StrictMode.setThreadPolicy(policy);
mButton = (Button)findViewById(R.id.Button01);
mTextView = (TextView)findViewById(R.id.TextView01);
mEditText = (EditText)findViewById(R.id.EditText01);
//登陆
mButton.setOnClickListener(new OnClickListener()
{
public void onClick(View v)
{
// run();
new Thread(runnable).start();
}
});
}
Runnable runnable = new Runnable() {
@Override
public void run() {
Socket socket;
String message = mEditText.getText().toString() + "/r/n";
try {
//创建Socket
// socket = new Socket("192.168.1.110",54321);
socket = new Socket("10.9.3.132", 54321); //IP：10.14.114.127，端口54321
//向服务器发送消息
PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())), true);
out.println(message);
//接收来自服务器的消息
BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
String msg = br.readLine();
if (msg != null) {
mTextView.setText(msg);
} else {
mTextView.setText("数据错误!");
}
//关闭流
out.close();
br.close();
//关闭Socket
socket.close();
} catch (Exception e) {
// TODO: handle exception
Log.e(DEBUG_TAG, e.toString());
}
}
};
}
然后是layout文件，里边的string被提取了出来，自己补全即可
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:id="@+id/TextView01"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/servermessage"
/>
<EditText
android:id="@+id/EditText01"
android:text="@string/sendmessage"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
</EditText>
<Button
android:id="@+id/Button01"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/buttonsend"
/>
</LinearLayout>
build.gradle还是贴出来吧
apply plugin: 'com.android.application'
android {
compileSdkVersion 26
buildToolsVersion "26.0.2"
defaultConfig {
applicationId "online.geekgalaxy.socketclient"
minSdkVersion 25
targetSdkVersion 26
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.android.support:appcompat-v7:26.+'
compile 'com.android.support.constraint:constraint-layout:1.0.2'
testCompile 'junit:junit:4.12'
}
