Android通过Socket实现局域网通信例子
最近工作上涉及比较多局域网连接和通信的业务需求，发现自己在这块一直是一个空缺，因此在网上找了一些资料，也在AS上试着验证，基本没有什么问题。
好了，不多说，直接上代码。
首先是Server端的代码实现：
1）MainActivity.java
package com.example.socketserver;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Context;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.os.Handler;
import android.os.Message;
public class MainActivity extends AppCompatActivity {
private TextView server_ip;
private TextView server_textView;
private EditText server_editText;
private Button server_button;
private SocketServer server;//启动服务端端口,服务端IP为手机IP
private static final String TAG_LOG = "SocketServer_Actdebug";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
server_ip = (TextView)findViewById(R.id.server_ip);
server_ip.setText("myip:"+getLocalIp());
server_textView = (TextView)findViewById(R.id.server_textView);
server_editText = (EditText) findViewById(R.id.server_editText);
server_button = (Button) findViewById(R.id.server_button);
server = new SocketServer(6666);
server.beginListen();//socket服务端开始监听
server_button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
server.sendMessage(server_editText.getText().toString().trim());//socket发送数据
}
});
SocketServer.ServerHandler = new Handler() {//socket收到消息线程
@Override
public void handleMessage(Message msg) {
server_textView.setText(msg.obj.toString());
}
};
}
private String getLocalIp() {
WifiManager wifiManager = (WifiManager) this.getSystemService(Context.WIFI_SERVICE);
WifiInfo wifiInfo = wifiManager.getConnectionInfo();
int ipAddress = wifiInfo.getIpAddress();
if (0 == ipAddress) {
return null;
}
return ((ipAddress & 0xff) + "." + (ipAddress >> 8 & 0xff) + "."
+ (ipAddress >> 16 & 0xff) + "." + (ipAddress >> 24 & 0xff));
}
}2）SocketServer.java
package com.example.socketserver;
import android.os.Handler;
import android.os.Message;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
public class SocketServer {
private ServerSocket server;
private Socket socket;
private InputStream in;
private String str = null;
private boolean isClint = false;
public static Handler ServerHandler;
private static final String TAG_LOG = "SocketServer_debug";
/**
* @param port 端口号
* @steps bind();绑定端口号
* @effect 初始化服务端
*/
public SocketServer(int port) {
try {
server = new ServerSocket(port);
isClint = true;
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* @steps listen();
* @effect socket监听数据
*/
public void beginListen() {
new Thread(new Runnable() {
@Override
public void run() {
try {
socket = server.accept();//accept();接受请求
try {
in = socket.getInputStream();//得到输入流
while (!socket.isClosed()) {//实现数据循环接收
byte[] bt = new byte[50];
in.read(bt);
str = new String(bt, "UTF-8");//编码方式,解决收到数据乱码
if (str != null && str != "exit"){
returnMessage(str);
} else if (str == null || str == "exit") {
break;//跳出循环结束socket数据接收
}
System.out.println(str);
}
} catch (IOException e) {
e.printStackTrace();
socket.isClosed();
}
} catch (IOException e) {
e.printStackTrace();
socket.isClosed();
}
}
}).start();
}
/**
* @steps write();
* @effect socket服务端发送信息
*/
public void sendMessage(final String chat) {
new Thread(new Runnable() {
@Override
public void run() {
try {
PrintWriter out = new PrintWriter(socket.getOutputStream());
out.print(chat);
out.flush();
} catch (IOException e) {
e.printStackTrace();
}
}
}).start();
}
/**
* @steps read();
* @effect socket服务端得到返回数据并发送到主界面
*/
public void returnMessage(String chat) {
Message msg = new Message();
msg.obj = chat;
ServerHandler.sendMessage(msg);
}
}
接下来是Client端的代码实现：
1）MainActivity.java
package com.example.socketclient;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Context;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
private TextView client_ip;
private TextView client_textView;
private EditText client_editText;
private Button client_button;
private SocketClient client;
private static final String TAG_LOG = "SocketClient_Actdebug";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
client_ip = (TextView) findViewById(R.id.client_ip);
client_ip.setText("ip:"+getLocalIp());
client_textView = (TextView) findViewById(R.id.client_textView);
client_editText = (EditText) findViewById(R.id.client_editText);
client_button = (Button) findViewById(R.id.client_button);
client = new SocketClient(this, "192.168.2.6", 6666);//服务端的IP地址和端口号
client.openClientThread();//开启客户端接收消息线程
client_button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
client.sendMsg(client_editText.getText().toString().trim());//发送消息
}
});
//接受消息
SocketClient.ClientHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
client_textView.setText(msg.obj.toString());
Log.d(TAG_LOG, msg.obj.toString());
}
};
}
private String getLocalIp() {
WifiManager wifiManager = (WifiManager) this.getSystemService(Context.WIFI_SERVICE);
WifiInfo wifiInfo = wifiManager.getConnectionInfo();
int ipAddress = wifiInfo.getIpAddress();
if (0 == ipAddress) {
return null;
}
return ((ipAddress & 0xff) + "." + (ipAddress >> 8 & 0xff) + "."
+ (ipAddress >> 16 & 0xff) + "." + (ipAddress >> 24 & 0xff));
}
}package com.example.socketclient;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Context;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
private TextView client_ip;
private TextView client_textView;
private EditText client_editText;
private Button client_button;
private SocketClient client;
private static final String TAG_LOG = "SocketClient_Actdebug";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
client_ip = (TextView) findViewById(R.id.client_ip);
client_ip.setText("ip:"+getLocalIp());
client_textView = (TextView) findViewById(R.id.client_textView);
client_editText = (EditText) findViewById(R.id.client_editText);
client_button = (Button) findViewById(R.id.client_button);
client = new SocketClient(this, "192.168.2.6", 6666);//服务端的IP地址和端口号
client.openClientThread();//开启客户端接收消息线程
client_button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
client.sendMsg(client_editText.getText().toString().trim());//发送消息
}
});
//接受消息
SocketClient.ClientHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
client_textView.setText(msg.obj.toString());
Log.d(TAG_LOG, msg.obj.toString());
}
};
}
private String getLocalIp() {
WifiManager wifiManager = (WifiManager) this.getSystemService(Context.WIFI_SERVICE);
WifiInfo wifiInfo = wifiManager.getConnectionInfo();
int ipAddress = wifiInfo.getIpAddress();
if (0 == ipAddress) {
return null;
}
return ((ipAddress & 0xff) + "." + (ipAddress >> 8 & 0xff) + "."
+ (ipAddress >> 16 & 0xff) + "." + (ipAddress >> 24 & 0xff));
}
}2）SocketClient.java
package com.example.socketclient;
import android.content.Context;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.widget.Toast;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.SocketAddress;
import java.net.UnknownHostException;
public class SocketClient {
private Socket clientSocket;
private Context mContext;
private String site;//端口
private PrintWriter out;
private InputStream mInputStream;
private String getStr;
private int port;//IP
private boolean isClient = false;
public static Handler ClientHandler;
private static final String TAG_LOG = "SocketClient_debug";
public SocketClient(Context context, String site, int port) {
this.mContext = context;
this.site = site;
this.port = port;
}
//@effect 开启线程建立连接开启客户端
public void openClientThread() {
new Thread(new Runnable() {
@Override
public void run() {
try {
clientSocket = new Socket(site, port);//connect()步骤
// client.setSoTimeout ( 5000 );//设置超时时间
// clientSocket = new Socket();
// SocketAddress socketAddress = new InetSocketAddress(site, port);
// clientSocket.connect(socketAddress, 3000);
if (clientSocket != null) {
isClient = true;
getOutString();
getInString();
} else {
isClient = false;
Toast.makeText(mContext, "网络连接失败 openClientThread", Toast.LENGTH_LONG).show();
}
Log.d(TAG_LOG, "site = " + site + " , port = " + port);
} catch (UnknownHostException e) {
e.printStackTrace();
Log.d(TAG_LOG, "UnknownHostException");
} catch (IOException e) {
e.printStackTrace();
Log.d(TAG_LOG, "IOException");
}
}
}).start();
}
//得到输出字符串
public void getOutString() {
Log.d(TAG_LOG, "getOutString() invoked");
try {
out = new PrintWriter(clientSocket.getOutputStream());
} catch (IOException e) {
e.printStackTrace();
Log.d(TAG_LOG, "getOutString() IOException");
}
}
/**
* @steps read();
* @effect 得到输入字符串
*/
public void getInString() {
Log.d(TAG_LOG, "getInString() invoked");
while (isClient) {
try {
mInputStream = clientSocket.getInputStream();
byte[] bt = new byte[50];//得到的是16进制数，需要进行解析
mInputStream.read(bt);
getStr = new String(bt, "UTF-8");
} catch (IOException e) {
e.printStackTrace();
}
if (getStr != null) {
Message msg = new Message();
msg.obj = getStr;
ClientHandler.sendMessage(msg);
}
}
}
//@steps write(); @effect 发送消息
public void sendMsg(final String str) {
android.util.Log.d(TAG_LOG,"sendMsg str:"+str);
new Thread(new Runnable() {
@Override
public void run() {
if (clientSocket != null) {
out.print(str);
out.flush();
Log.d(TAG_LOG, "client send message : " + str);
} else {
isClient = false;
}
}
}).start();
}
}
最后是调试验证，分别拿两台Android系统手机连上同一个局域网，运行Server端的Demo看下对应的IP地址，然后将Client端的Demo上的ip改一下。最后分别在手机上运行即可。
其他注意：
1）布局和资源自行解决；
2）权限要注意，分别是网络权限和WLAN权限；
完整的工程代码可以到这里下载：
SocketDemo.rar-Java文档类资源-CSDN下载Android局域网连接通信Demo更多下载资源、学习资料请访问CSDN下载频道.https://download.csdn.net/download/lgglkk/41794776