天地幣：所用到的 Android Socket 通訊編程技術實驗

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1、為了開發“天地幣”這個Android手機項目，須要用到Socket編程。

2、天地幣是一種類似於比特幣的虛擬貨幣。

3、為了賺取CSDN的C幣，須要寫篇部落格。

4、乾脆將調試Socket的項目發出來跟網友分享。

閑話休提，直接上代碼，首先是字串的定義：

<?
xml version="1.0" encoding="utf-8"?><resources>    <string name="app_name">xyzSocket</string>    <string name="hello_world">Hello world!</string>    <string name="action_settings">Settings</string>    <string name="ipaddr_str">本機IP:</string>    <string name="serveripaddr_str">伺服器IP:</string>    <string name="server_str">設定為服務端</string>    <string name="client_str">串連為用戶端</string>    <string name="mymachine_str">本機就是</string>    <string name="send_str">發送</string>    <string name="online_str">0線上</string>    <string name="threeline_str">第1行\n第2行\n第3行\n</string>    </resources>

其次是xml檔案：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context="com.example.xyzsocket.MainActivity$PlaceholderFragment" >        <RelativeLayout        android:id="@+id/relativelayout_1"        android:layout_width="match_parent"        android:layout_height="wrap_content"        >        <TextView        android:id="@+id/ipaddr_label_1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_centerVertical="true"        android:text="@string/ipaddr_str"         />        <EditText        android:id="@+id/myipaddr_edit"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_toRightOf="@+id/ipaddr_label_1"        android:layout_toLeftOf="@+id/noline_label_1"        />        <TextView        android:id="@+id/online_label_1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentRight="true"        android:layout_centerVertical="true"        android:text="@string/online_str"         />            </RelativeLayout>        <RelativeLayout        android:id="@+id/relativelayout_2"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_below="@+id/relativelayout_1"        >        <EditText        android:id="@+id/server_receiver"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:maxLines="3"        android:text="@string/threeline_str"        />            </RelativeLayout>        <RelativeLayout        android:id="@+id/relativelayout_3"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_below="@+id/relativelayout_2"        >            <TextView        android:id="@+id/ipaddr_label_2"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_centerVertical="true"        android:text="@string/serveripaddr_str"         />        <EditText        android:id="@+id/serveripaddr_edit"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_toRightOf="@+id/ipaddr_label_2"        android:layout_toLeftOf="@+id/serveripaddr_check"        />        <CheckBox        android:id="@+id/serveripaddr_check"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentRight="true"        android:layout_centerVertical="true"        android:text="@string/mymachine_str"        />            </RelativeLayout>        <RelativeLayout        android:id="@+id/relativelayout_4"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_below="@+id/relativelayout_3"        >        <EditText        android:id="@+id/send_message"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_toLeftOf="@+id/butt_send"        />                <Button        android:id="@+id/butt_send"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentRight="true"        android:text="@string/send_str"            />        <LinearLayout        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_centerHorizontal="true"        android:orientation="horizontal"        android:layout_below="@+id/send_message"            >                    <Button        android:id="@+id/butt_server"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="@string/server_str"        android:layout_below="@+id/send_message"            />                <Button        android:id="@+id/butt_client"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="@string/client_str"        android:layout_below="@+id/send_message"            />                </LinearLayout>            </RelativeLayout>    </RelativeLayout>

最基本的是代碼：

package com.example.xyzsocket;import java.io.DataInputStream;import java.io.DataOutputStream;import java.io.IOException;import java.net.InetAddress;import java.net.ServerSocket;import java.net.Socket;import java.net.UnknownHostException;import java.util.ArrayList;import android.support.v7.app.ActionBarActivity;import android.support.v7.app.ActionBar;import android.support.v4.app.Fragment;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.LayoutInflater;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.ViewGroup;import android.widget.Button;import android.widget.CheckBox;import android.widget.CompoundButton;import android.widget.EditText;import android.widget.TextView;import android.os.Build;public class MainActivity extends ActionBarActivity {private EditText et01 = null;private EditText et02 = null;private EditText et03 = null;private EditText et04 = null;private Button bn01 = null;private Button bn02 = null;private Button bn03 = null;private CheckBox cb01 = null;private TextView tv01 = null;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);if (savedInstanceState == null) {getSupportFragmentManager().beginTransaction().add(R.id.container, new PlaceholderFragment()).commit();}}private String intToIp(int i){return (i & 0xFF) + "." + ((i>>8) & 0xFF) + "." + ((i>>16) & 0xFF) + "." + ((i>>24) & 0xFF);}@Overridepublic void onWindowFocusChanged(boolean hasFocus) {// TODO Auto-generated method stubsuper.onWindowFocusChanged(hasFocus);if( et01 == null ){et01 = (EditText) findViewById(R.id.myipaddr_edit);if(et01 != null){WifiManager wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);if(!wifiManager.isWifiEnabled()){wifiManager.setWifiEnabled(true);}WifiInfo wifiInfo = wifiManager.getConnectionInfo();int ipAddress = wifiInfo.getIpAddress();et01.setText(intToIp(ipAddress));}}if( et02 == null ){et02 = (EditText) findViewById(R.id.server_receiver);if(et02 != null){}}if( et03 == null ){et03 = (EditText) findViewById(R.id.serveripaddr_edit);if(et03 != null){}}if( et04 == null ){et04 = (EditText) findViewById(R.id.send_message);if(et04 != null){et04.setEnabled(false);}}if( bn01 == null ){bn01 = (Button) findViewById(R.id.butt_server);if( bn01 != null ){bn01.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stub    new Thread(){          @Override          public void run()          {          //網路訪問的代碼放在這裡     server();        }      }.start();  }});}}if( bn02 == null ){bn02 = (Button) findViewById(R.id.butt_client);if( bn02 != null ){bn02.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stub    new Thread(){          @Override          public void run()          {          //網路訪問的代碼放在這裡     client();        }      }.start();  }});}}if( bn03 == null ){bn03 = (Button) findViewById(R.id.butt_send);if( bn03 != null ){bn03.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stub    new Thread(){          @Override          public void run()          {          //網路訪問的代碼放在這裡     sendmsg();        }      }.start();  }});bn03.setEnabled(false);}}if( cb01 == null ){cb01 = (CheckBox) findViewById(R.id.serveripaddr_check);if( cb01 != null ){cb01.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {@Overridepublic void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {// TODO Auto-generated method stubMessage msg = new Message();msg.arg1 = isChecked?1:0;msg.what = 103;handler.sendMessage(msg);}});}}if( tv01 == null ){tv01 = (TextView) findViewById(R.id.online_label_1);if( tv01 != null ){}}}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}@Overridepublic boolean onOptionsItemSelected(MenuItem item) {// Handle action bar item clicks here. The action bar will// automatically handle clicks on the Home/Up button, so long// as you specify a parent activity in AndroidManifest.xml.int id = item.getItemId();if (id == R.id.action_settings) {return true;}return super.onOptionsItemSelected(item);}/** * A placeholder fragment containing a simple view. */public static class PlaceholderFragment extends Fragment {public PlaceholderFragment() {}@Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {View rootView = inflater.inflate(R.layout.fragment_main, container,false);return rootView;}}private Handler handler = new Handler(){@Overridepublic void handleMessage(Message msg) {// TODO Auto-generated method stubsuper.handleMessage(msg);myHandleMessage(msg);}};private void myHandleMessage(Message msg){switch(msg.what){case 101:bn01.setText("伺服器中止");break;case 102:        bn01.setText(getString(R.string.server_str));break;case 103:if(msg.arg1>0){et03.setText(et01.getText().toString());}break;case 104:bn02.setText(msg.arg1>0?"用戶端中止":getString(R.string.client_str));bn03.setEnabled(msg.arg1>0);et04.setEnabled(msg.arg1>0);break;case 110:String str = et02.getText().toString();int i = str.indexOf("\n");if(i>0){str = str.substring(i+1);}str += (String)msg.obj;str += "\n";et02.setText(str);break;case 111:Log.i("DEBUG", "用戶端收到:" + (String)msg.obj);break;case 112:Log.i("DEBUG", "伺服器中止了!!");tv01.setText("" + list.size() + "線上");bn02.setText(getString(R.string.client_str));bn03.setEnabled(false);et04.setEnabled(false);break;case 113:Log.i("DEBUG", "用戶端退出了!!");tv01.setText("" + list.size() + "線上");break;case 114:tv01.setText("" + list.size() + "線上");break;}}    ServerSocket aServerSocket = null;      ArrayList list = new ArrayList();  private void server(){myServerThread thread;if( aServerSocket != null ){try{aServerSocket.close();aServerSocket = null;}catch(IOException e){e.printStackTrace();}        if( bn01 != null )        {        Message msg = new Message();        msg.what = 102;        handler.sendMessage(msg);        }return;}        try {          aServerSocket = new ServerSocket(55555);        Log.i("DEBUG", "already listen 55555 port.");          } catch (Exception e) {          e.printStackTrace();          }          if(aServerSocket == null){        Log.i("DEBUG", "偵聽失敗了!!");        return;        }    Log.i("DEBUG", "偵聽成功了!!");        if( bn01 != null )        {        Message msg = new Message();        msg.what = 101;        handler.sendMessage(msg);        }        int num = 0;          while (num < 10) {          Socket aSessionSoket = null;          try {              Log.i("DEBUG", "偵聽前!!");        aSessionSoket = aServerSocket.accept();              Log.i("DEBUG", "偵聽後!!");        thread = new myServerThread(aSessionSoket);          thread.start();        Message msg = new Message();        msg.what = 114;        handler.sendMessage(msg);        } catch (IOException e1) {          // TODO Auto-generated catch block          e1.printStackTrace();              Log.i("DEBUG", "伺服器手動中止了!!");            for(int i=0;i<list.size();i++){            Socket s = (Socket)list.get(i);            try{            s.close();            }catch(IOException e){            e.printStackTrace();            }            }            list.clear();            break;        }      num = list.size();    Log.i("DEBUG", "socket count = " + num);    }}  class myServerThread extends Thread {  public Socket aSessionSoket = null;  public myServerThread(Socket socket) {  aSessionSoket = socket;  list.add(socket);  }    public void run() {      DataInputStream aDataInput = null;      DataOutputStream aDataOutput = null;  try {  aDataInput = new DataInputStream(aSessionSoket.getInputStream());  aDataOutput = new DataOutputStream(aSessionSoket.getOutputStream());  while (true) {              Log.i("DEBUG", "伺服器接收前!!");String str = aDataInput.readUTF(); // read msg.            Log.i("DEBUG", "伺服器接收後!!");Message msg = new Message();msg.obj = str;msg.what = 110;handler.sendMessage(msg);aDataOutput.writeUTF("OK:" + str);}  } catch (IOException e) {              // TODO Auto-generated catch block  e.printStackTrace();} finally {  try {if (aDataInput != null)aDataInput.close();if (aDataOutput != null)  aDataOutput.close();  list.remove(aSessionSoket);  aSessionSoket.close();// 這裡的退出是用戶端主動斷開Message msg = new Message();msg.what = 113;handler.sendMessage(msg);} catch (Exception e2) {  e2.printStackTrace();  }    }    }  }Socket clientsocket = null;private void client(){Message msg;if( clientsocket != null ){try{clientsocket.close();clientsocket = null;}catch(IOException e){e.printStackTrace();return;}        msg = new Message();        msg.what = 104;        msg.arg1 = 0;        handler.sendMessage(msg);return;}InetAddress serverAddr;try {serverAddr = InetAddress.getByName ( et03.getText().toString() );Log.d ( "DEBUG" , "C: Connecting..." );// 與伺服器擷取串連clientsocket = new Socket(serverAddr, 55555);} catch (UnknownHostException e1) {           // TODO Auto-generated catch block           e1.printStackTrace();} catch (IOException e) {           // TODO Auto-generated catch block           e.printStackTrace();}if(clientsocket == null){        Log.i("DEBUG", "串連失敗了!!");return;}        if( bn03 != null )        {        msg = new Message();        msg.what = 104;        msg.arg1 = 1;        handler.sendMessage(msg);        }myClientThread thread = new myClientThread(clientsocket);  thread.start();  }  class myClientThread extends Thread {  public Socket aSessionSoket = null;  public myClientThread(Socket socket) {  aSessionSoket = socket;  }    public void run() {      DataInputStream aDataInput = null;  try {  aDataInput = new DataInputStream(aSessionSoket.getInputStream());  while (true) {              Log.i("DEBUG", "用戶端接收前!!");String str = aDataInput.readUTF();            Log.i("DEBUG", "用戶端接收後!!");Message msg = new Message();msg.obj = str;msg.what = 111;handler.sendMessage(msg);}  } catch (IOException e) {              // TODO Auto-generated catch block  e.printStackTrace();Message msg = new Message();msg.what = 112;handler.sendMessage(msg);} finally {  try {if (aDataInput != null)aDataInput.close();aSessionSoket.close();} catch (Exception e2) {  e2.printStackTrace();  }    }    }  }private void sendmsg(){    DataOutputStream aDataOutput = null;    String message = et04.getText().toString();    if(message.isEmpty()){    return;    }try {Log.i ( "DEBUG" , "C: Sending: ‘" + message + "‘" );aDataOutput = new DataOutputStream(clientsocket.getOutputStream());aDataOutput.writeUTF(message);} catch (Exception e) {e.printStackTrace();} finally {}}}

別忘了加入許可權：

<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"></uses-permission>   <uses-permission android:name="android.permission.CHANGE_WIFI_STATE"></uses-permission>   <uses-permission android:name="android.permission.WAKE_LOCK"></uses-permission><uses-permission android:name="android.permission.INTERNET"></uses-permission>

最後簡單說說使用方法：

1、軟體自己主動檢測到自己wifi的IP地址。

2、一台機器能夠同一時候扮演server和client。

3、其它機器能夠登入到同一台server。

網路通訊。就這麼簡單。

天地幣：所用到的 Android Socket 通訊編程技術實驗