Android學習六：Socket 使用

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1socket的作用

通過http去擷取伺服器的資料在有些情況下是行不通的，所有使用socket與伺服器通訊也是必須掌握的

2.代碼

好了上代碼，代碼中有解釋，首先是簡單的服務端代碼

package org.tonny;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.net.ServerSocket;import java.net.Socket;public class SockServer implements Runnable{    private static final int PORT = 55555;    @Override    public void run()    {        //用於響應用戶端        Socket client = null;                //服務端socket        ServerSocket server = null;        try        {            //綁定連接埠，準備接受用戶端的串連            server = new ServerSocket(PORT);            while (true)            {                System.out.println("Wait for connecting...");                                //這個操作是阻塞的，有用戶端串連才會進行下一步操作                client = server.accept();                                //讀取用戶端發送的資料                BufferedReader in = new BufferedReader(new InputStreamReader(client.getInputStream()));                String msg = in.readLine();                System.out.println("Client:  " + msg);            }        }        catch (Exception e)        {            System.out.println("Server Receive: Error");        }        finally        {            try            {                //關閉通訊端                server.close();                client.close();            }            catch (IOException e)            {                System.out.println("Server Receive: Error" + e.getMessage());            }        }    }    public static void main(String[] args)    {        Thread thread = new Thread(new SockServer());        thread.start();    }}

 

接著是android用戶端的代碼

package org.tonny.client;import java.io.BufferedWriter;import java.io.IOException;import java.io.OutputStreamWriter;import java.io.PrintWriter;import java.net.Socket;import java.net.UnknownHostException;import android.app.Activity;import android.os.Bundle;import android.util.Log;import android.view.View;import android.widget.EditText;public class ClientActivity extends Activity{    // 需要發送的資訊寫在這個控制項中    private EditText txtInfo = null;    private static final int PORT = 55555;    @Override    protected void onCreate(Bundle savedInstanceState)    {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_client);        txtInfo = (EditText) this.findViewById(R.id.txtInfo);    }    public void onBtnSendClick(View view)    {        String msg = txtInfo.getText().toString();                //不適用綫程通不過去，直接異常處理，這是因為android 3.0+以上 已經不建議在activity中添加耗時操作，要介面和資料脫離。4.0以上的通訊都必須放到線程裡去做 不能在UI線程。        //解決辦法，另起線程或Service處理socket。        SockClient sock = new SockClient("192.168.1.106", PORT, msg);        sock.start();    }    private final class SockClient extends Thread    {        private String ip;        private int port;        private String msg;        public SockClient(String ip, int port, String msg)        {            this.ip = ip;            this.port = port;            this.msg = msg;        }        @Override        public void run()        {            Socket client = null;            try            {                Log.d("CLIENT", "Connecting...");                // 與伺服器擷取串連                client = new Socket(ip, port);                // 擷取 Client 端的輸出資料流                PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(client.getOutputStream())), true);                out.println(msg);            }            catch (UnknownHostException e)            {                Log.e("CLIENT", "Error", e);            }            catch (IOException e)            {                Log.e("CLIENT", "Error", e);            }            catch (Exception e)            {                Log.e("CLIENT", "Error", e);            }            finally            {                try                {                    if (client != null && !client.isClosed())                    {                        client.close();                    }                }                catch (IOException e)                {                    Log.e("TCP", "Error", e);                }            }        }    }}

 

要注意的是，socket操作一定要在單獨的線程中進行，否則會產生異常。

3.總結

還是一點，android操作socket的時候，應該線上程中執行，否則會報異常，為了這個花了不少時間調試，還是沒搞定，最後問的度娘。

Android學習六：Socket 使用