Android學習筆記（31） — 網路通訊之Socket簡易聊天室

在上一篇博文中，簡單介紹了Socket的簡單通訊，這篇博文中將針對它進行簡單的運用。接下來的例子是參考《Android應用開發揭秘》，不過上面有些小問題，例如字元編碼問題。下面直接看下實現過程。

1、伺服器：

import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.io.PrintWriter;import java.net.ServerSocket;import java.net.Socket;import java.util.ArrayList;import java.util.List;import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;public class Server {private static int PORT = 54327;private static List<Socket> mSocketList = new ArrayList<Socket>();private ExecutorService mExcutorService;private ServerSocket mServerSocket;public static void main(String[] args) {new Server();}public Server() {try {mServerSocket = new ServerSocket(PORT);mExcutorService = Executors.newCachedThreadPool();Socket client = null;while (true) {client = mServerSocket.accept();mSocketList.add(client);mExcutorService.execute(new ThreadServer(client));}} catch (Exception e) {// TODO: handle exceptione.printStackTrace();}}static class ThreadServer implements Runnable {private Socket mSocket;private BufferedReader mBufferedReader;private PrintWriter mPrintWriter;private String MSG = "";public ThreadServer(Socket socket) throws IOException {this.mSocket = socket;mBufferedReader = new BufferedReader(new InputStreamReader(mSocket.getInputStream(),"UTF-8"));mPrintWriter = new PrintWriter(mSocket.getOutputStream(), true);MSG = mBufferedReader.readLine();System.out.println(MSG);sendMessage();}@Overridepublic void run() {// TODO Auto-generated method stubtry {while ((MSG = mBufferedReader.readLine()) != null) {if(MSG.trim().equals("莫:exit")){MSG="下線了ing...";System.out.println("read-->" + MSG);sendMessage();mSocketList.remove(mSocket);mBufferedReader.close();mPrintWriter.close();mSocket.close();break;}System.out.println("read-->" + MSG);sendMessage();}} catch (Exception e) {// TODO: handle exceptionSystem.out.println(e.getMessage());}}private void sendMessage() throws IOException {for (Socket client : mSocketList) {mPrintWriter = new PrintWriter(client.getOutputStream(), true);mPrintWriter.println(MSG);}}}}

2、用戶端：

package com.ideal.socket;import java.io.BufferedReader;import java.io.InputStreamReader;import java.io.PrintWriter;import java.net.Socket;import android.app.Activity;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.TextView;public class Net_SocketClientActivity extends Activity {private EditText mUser = null;//輸入private Button mLogin = null;private EditText mSendMsg = null;//輸入private Button mSend = null;private TextView mTextView = null;//記錄private Socket mSocket;private Thread mThread;private BufferedReader mBufferedReader;private PrintWriter mPrintWriter;private String name = "";private String MSG="";/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);mUser = (EditText) findViewById(R.id.user);mLogin = (Button) findViewById(R.id.login);mSendMsg = (EditText)findViewById(R.id.sendMsg);mSend = (Button)findViewById(R.id.sentBtn);mTextView = (TextView)findViewById(R.id.allMassage); mLogin.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubtry {mLogin.setVisibility(View.GONE);mUser.setVisibility(View.GONE);mSocket = new Socket("172.31.100.50",54327);//轉碼mBufferedReader = new BufferedReader(new InputStreamReader(mSocket.getInputStream(),"GBK"));mPrintWriter = new PrintWriter(mSocket.getOutputStream(), true);name = mUser.getText().toString();try {mPrintWriter.println(name+":login...");mPrintWriter.flush();} catch (Exception e) {// TODO: handle exceptionSystem.out.println(e.getMessage());}} catch (Exception e) {// TODO: handle exception}}}); mSend.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stub try {String sendMsg = mSendMsg.getText().toString();mPrintWriter.println(name+":"+sendMsg);mPrintWriter.flush();} catch (Exception e) {// TODO: handle exceptionSystem.out.println(e.getMessage());}}});mThread = new Thread(mRunnable);mThread.start();}private Runnable mRunnable =new Runnable() {@Overridepublic void run() {// TODO Auto-generated method stubwhile(true){try {MSG=mBufferedReader.readLine();if(MSG!=null){mHandler.sendMessage(mHandler.obtainMessage());}else {break;}} catch (Exception e) {// TODO: handle exception}}}};Handler mHandler = new Handler(){public void handleMessage(Message msg){super.handleMessage(msg);try {mTextView.append("\n"+MSG);} catch (Exception e) {// TODO: handle exception}}};}

xml：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <EditText        android:id="@+id/user"        android:layout_width="fill_parent"        android:layout_height="wrap_content" />    <Button         android:id="@+id/login"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="登入"/>        <EditText        android:id="@+id/sendMsg"        android:layout_width="fill_parent"        android:layout_height="wrap_content" />    <Button        android:id="@+id/sentBtn"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="發送" />       <TextView        android:id="@+id/allMassage"        android:layout_width="fill_parent"        android:layout_height="fill_parent" /></LinearLayout>

看下：

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註：上面只是使用了模擬器作為用戶端和PC作為服務端通訊，當然，可以在多開啟幾個模擬器，這相當幾個客戶同時在聊天。如果你是在同一個實驗室裡面進行通行，那麼在另一台電腦上使用的模擬器同樣也能和其他台電腦上的模擬器通訊。

存在問題：

1、剛開始時在模擬器和PC上都不能正常顯示字串，後來得知得轉碼。從上面的代碼可看出：

在服務端：

mBufferedReader = new BufferedReader(new InputStreamReader(mSocket.getInputStream(),"UTF-8"));

在用戶端：

mBufferedReader = new BufferedReader(new InputStreamReader(mSocket.getInputStream(),"GBK"));

2、模擬器上完全實現和PC正常通訊，但是如果使用真機作為用戶端，則通訊不了。目前知道原因是，通過SOCKET通訊要在同一網段才能實現的。由於條件問題，所以這個改天再調試看看。