2019独角兽企业重金招聘Python工程师标准>>> 
前面介绍了Socket的简介和原理，今天简单的来实现一下客服端与服务器通信的功能
客服端
建立连接
try {
socket = new Socket("192.168.1.100", 9999);
Log.i("Android", "与服务器建立连接：" + socket);
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}发送消息
try {
// socket.getInputStream()
DataOutputStream writer = new DataOutputStream(socket.getOutputStream());
writer.writeUTF("嘿嘿，你好啊，服务器.."); // 写一个UTF-8的信息
System.out.println("发送消息");
} catch (IOException e) {
e.printStackTrace();
}添加权限
服务端（在Eclipse建立一个Java项目即可）
import java.io.DataInputStream;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
public class SocketServer {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
System.out.println("123456");
startService();
}
/**
* 启动服务监听，等待客户端连接
*/
private static void startService() {
try {
// 创建ServerSocket
ServerSocket serverSocket = new ServerSocket(9999);
System.out.println("--开启服务器，监听端口 9999--");
// 监听端口，等待客户端连接
while (true) {
System.out.println("--等待客户端连接--");
Socket socket = serverSocket.accept(); //等待客户端连接
System.out.println("得到客户端连接：" + socket);
startReader(socket);
}
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 从参数的Socket里获取最新的消息
*/
private static void startReader(final Socket socket) {
new Thread(){
@Override
public void run() {
DataInputStream reader;
try {
// 获取读取流
reader = new DataInputStream( socket.getInputStream());
while (true) {
System.out.println("*等待客户端输入*");
// 读取数据
String msg = reader.readUTF();
System.out.println("获取到客户端的信息：" + msg);
}
} catch (IOException e) {
e.printStackTrace();
}
}
}.start();
}
}运行Java项目，得到
然后在手机端点击发送消息
服务端接收到消息，打印信息
服务端发送消息给客户端
服务端代码：
public class TestServer {
public static void main(String[] args) {
try {
ServerSocket serverSocket = new ServerSocket(30000);
System.out.println("服务器已连接");
while(true){
System.out.println("123");
Socket socket = serverSocket.accept();
OutputStream outputStream = socket.getOutputStream();
outputStream.write("你好，我是服务器\n".getBytes("utf-8"));
outputStream.close();
socket.close();
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}客户端代码
public class Demo2Activity extends AppCompatActivity {
static TextView textView;
Socket socket;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.demo2);
initView();
}
private void initView(){
textView = (TextView) findViewById(R.id.txt_1);
new Thread(new Runnable() {
@Override
public void run() {
try {
socket = new Socket("192.168.1.101", 30000);
// socket.setSoTimeout(10000);//设置10秒超时
Log.i("Android", "与服务器建立连接：" + socket);
BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
String line = br.readLine();
Log.i("Android", "与服务器建立连接：" + line);
Message msg = new Message();
msg.what = 1;
msg.obj = line;
handler.sendMessage(msg);
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}catch (Exception e){
e.printStackTrace();
}
}
}).start();
}
Handler handler = new Handler(){
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
if (msg.what == 1){
textView.setText("这是来自服务器的数据:"+msg.obj.toString());
}
}
};
}先运行服务端，再运行客户端
效果图：
源码包含多个demo，也是参考网上资料而来
源码地址：https://github.com/DickyQie/android-socket