Android Socket简单用法
Android Socket简单用法
Socket通常也称做”套接字“,用于描述IP地址和端口,废话不多说,它就是网络通信过程中端点的抽象表示。值得一提的是,Java在包java.net中提供了两个类Socket和ServerSocket,分别用来表示双向连接的客户端和服务端。这是两个封装得非常好的类,使用起来很方便!
下面将首先创建一个SocketServer的类作为服务端如下,该服务端实现了多线程机制,可以在特定端口处监听多个客户请求,一旦有客户请求,Server总是会创建一个服务纯种来服务新来的客户,而自己继续监听。程序中accept()是一个阻塞函数,所谓阻塞性方法就是说该方法被调用后将等待客户的请求,直到有一个客户启动并请求连接到相同的端口,然后accept()返回一个对应于客户的Socket。这时,客户方和服务方都建立了用于通信的Socket,接下来就是由各个Socket分别打开各自的输入、输出流。
- SocketServer类,服务器实现:
- package learn.test;
- import java.io.BufferedReader;
- import java.io.IOException;
- import java.io.InputStreamReader;
- import java.io.PrintWriter;
- import java.net.ServerSocket;
- import java.net.Socket;
- public class SocketServer {
- ServerSocket sever;
- public SocketServer(int port) {
- try {
- sever = new ServerSocket(port);
- } catch (IOException e) {
- e.printStackTrace();
- }
- }
- public void beginListen() {
- while (true) {
- try {
- final Socket socket = sever.accept();
- new Thread(new Runnable() {
- public void run() {
- BufferedReader in;
- try {
- in = new BufferedReader(new InputStreamReader(
- socket.getInputStream(), "UTF-8"));
- PrintWriter out = new PrintWriter(
- socket.getOutputStream());
- while (!socket.isClosed()) {
- String str;
- str = in.readLine();
- out.println("Hello!world!! " + str);
- out.flush();
- if (str == null || str.equals("end"))
- break;
- System.out.println(str);
- }
- socket.close();
- } catch (IOException e) {
- e.printStackTrace();
- }
- }
- }).start();
- } catch (IOException e) {
- e.printStackTrace();
- }
- }
- }
- }
- public class SocketClient {
- static Socket client;
- public SocketClient(String site, int port) {
- try {
- client = new Socket(site, port);
- System.out.println("Client is created! site:" + site + " port:"
- + port);
- } catch (UnknownHostException e) {
- e.printStackTrace();
- } catch (IOException e) {
- e.printStackTrace();
- }
- }
- public String sendMsg(String msg) {
- try {
- BufferedReader in = new BufferedReader(new InputStreamReader(
- client.getInputStream()));
- PrintWriter out = new PrintWriter(client.getOutputStream());
- out.println(msg);
- out.flush();
- return in.readLine();
- } catch (IOException e) {
- e.printStackTrace();
- }
- return "";
- }
- public void closeSocket() {
- try {
- client.close();
- } catch (IOException e) {
- e.printStackTrace();
- }
- }
- public static void main(String[] args) throws Exception {
- }
- }
接下来就是来测试Socket通信了!
先运行TestSocketServer类,打开服务端,在12345端口处监听!
- public class TestSocketServer {
- public static void main(String[] argvs) {
- SocketServer server = new SocketServer(12345);
- server.beginListen();
- }
- }
|
评论暂时关闭