android网络编程(七)Socket --小Demo学习

服务器代码如下:
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
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 Main {
    private static final int PORT = 9999;
    private List<Socket> mList = new ArrayList<Socket>();
    private ServerSocket server = null;
    private ExecutorService mExecutorService = null; //thread pool
    
    public static void main(String[] args) {
        new Main();
    }
    public Main() {
        try {
            server = new ServerSocket(PORT);
            mExecutorService = Executors.newCachedThreadPool();  //create a thread pool
            System.out.println("服务器已启动...");
            Socket client = null;
            while(true) {
                client = server.accept();
                //把客户端放入客户端集合中
                mList.add(client);
                mExecutorService.execute(new Service(client)); //start a new thread to handle the connection
            }
        }catch (Exception e) {
            e.printStackTrace();
        }
    }
    class Service implements Runnable {
            private Socket socket;
            private BufferedReader in = null;
            private String msg = "";
            
            public Service(Socket socket) {
                this.socket = socket;
                try {
                    in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
                    //客户端只要一连到服务器,便向客户端发送下面的信息。
                    msg = "服务器地址:" +this.socket.getInetAddress() + "come toal:"
                        +mList.size()+"(服务器发送)";
                    this.sendmsg();
                } catch (IOException e) {
                    e.printStackTrace();
                }
                
            }

            @Override
            public void run() {
                try {
                    while(true) {
                        if((msg = in.readLine())!= null) {
                        	//当客户端发送的信息为:exit时,关闭连接
                            if(msg.equals("exit")) {
                                System.out.println("ssssssss");
                                mList.remove(socket);
                                in.close();
                                msg = "user:" + socket.getInetAddress()
                                    + "exit total:" + mList.size();
                                socket.close();
                                this.sendmsg();
                                break;
                                //接收客户端发过来的信息msg,然后发送给客户端。
                            } else {
                                msg = socket.getInetAddress() + ":" + msg+"(服务器发送)";
                                this.sendmsg();
                            }
                        }
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
          /**
           * 循环遍历客户端集合,给每个客户端都发送信息。
           */
           public void sendmsg() {
               System.out.println(msg);
               int num =mList.size();
               for (int index = 0; index < num; index ++) {
                   Socket mSocket = mList.get(index);
                   PrintWriter pout = null;
                   try {
                       pout = new PrintWriter(new BufferedWriter(
                               new OutputStreamWriter(mSocket.getOutputStream())),true);
                       pout.println(msg);
                   }catch (IOException e) {
                       e.printStackTrace();
                   }
               }
           }
        }    
}


此为java类,在Eclipse中建个工程,放进去下,右键直接run as,服务器便已经启动。

客户端代码:
package com.amaker.socket;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.Socket;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
/**
 * 除了isClose方法,Socket类还有一个isConnected方法来判断Socket对象是否连接成功。
 * 看到这个名字,也许读者会产生误解。
 * 其实isConnected方法所判断的并不是Socket对象的当前连接状态,
 * 而是Socket对象是否曾经连接成功过,如果成功连接过,即使现在isClose返回true,
 * isConnected仍然返回true。因此,要判断当前的Socket对象是否处于连接状态,
 * 必须同时使用isClose和isConnected方法,
 * 即只有当isClose返回false,isConnected返回true的时候Socket对象才处于连接状态。
 * 虽然在大多数的时候可以直接使用Socket类或输入输出流的close方法关闭网络连接,
 * 但有时我们只希望关闭OutputStream或InputStream,而在关闭输入输出流的同时,并不关闭网络连接。
 * 这就需要用到Socket类的另外两个方法:shutdownInput和shutdownOutput,
 * 这两个方法只关闭相应的输入、输出流,而它们并没有同时关闭网络连接的功能。
 * 和isClosed、isConnected方法一样,
 * Socket类也提供了两个方法来判断Socket对象的输入、输出流是否被关闭,
 * 这两个方法是isInputShutdown()和isOutputShutdown()。
 * shutdownInput和shutdownOutput并不影响Socket对象的状态。 
 */
//====================================================================================
/**
 * 运行过程剖析:
 * 1,服务器启动   
 * 2,客户端与服务器连接成功
 * 3,服务器发送信息给客户端 的线程 
 * 4,线程通过Handler发送信息给UI线程
 * 5,用TextView把信息显示
 * 
 * 当点击按钮时流程为:
 * 1,发送消息给服务器
 * 2,服务器受到客户端发送来的信息,并给服务器返回信息
 * 如上。
 */
public class SocketDemo extends Activity implements Runnable {
	private TextView tv_msg = null;
	private EditText ed_msg = null;
	private Button btn_send = null;
	// private Button btn_login = null;
	private static final String HOST = "10.0.2.2";
	private static final int PORT = 9999;
	private Socket socket = null;
	private BufferedReader in = null;
	private PrintWriter out = null;
	private String content = "";
	//接收线程发送过来信息,并用TextView显示
	public Handler mHandler = new Handler() {
		public void handleMessage(Message msg) {
			super.handleMessage(msg);
			tv_msg.setText(content);
		}
	};

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);

		tv_msg = (TextView) findViewById(R.id.TextView);
		ed_msg = (EditText) findViewById(R.id.EditText01);
		btn_send = (Button) findViewById(R.id.Button02);

		try {
			socket = new Socket(HOST, PORT);
			in = new BufferedReader(new InputStreamReader(socket
					.getInputStream()));
			out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(
					socket.getOutputStream())), true);
		} catch (IOException ex) {
			ex.printStackTrace();
			ShowDialog("login exception" + ex.getMessage());
		}
		btn_send.setOnClickListener(new Button.OnClickListener() {

			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				String msg = ed_msg.getText().toString();
				if (socket.isConnected()) {
					if (!socket.isOutputShutdown()) {
						out.println(msg);
					}
				}
			}
		});
		//启动线程,接收服务器发送过来的数据
		new Thread(SocketDemo.this).start();
	}
	/**
	 * 如果连接出现异常,弹出AlertDialog!
	 */
	public void ShowDialog(String msg) {
		new AlertDialog.Builder(this).setTitle("notification").setMessage(msg)
				.setPositiveButton("ok", new DialogInterface.OnClickListener() {

					@Override
					public void onClick(DialogInterface dialog, int which) {

					}
				}).show();
	}
	/**
	 * 读取服务器发来的信息,并通过Handler发给UI线程
	 */
	public void run() {
		try {
			while (true) {
				if (!socket.isClosed()) {
					if (socket.isConnected()) {
						if (!socket.isInputShutdown()) {
							if ((content = in.readLine()) != null) {
								content += "\n";
								mHandler.sendMessage(mHandler.obtainMessage());
							} else {

							}
						}
					}
				}
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

}

直接用模拟器运行就可以。

main.xml布局文件:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    android:orientation="vertical" 
    android:layout_width="fill_parent"  
    android:layout_height="fill_parent">  
    <TextView 
    	android:id="@+id/TextView" 
    	android:singleLine="false"  
        android:layout_width="fill_parent"  
        android:layout_height="wrap_content" />  
    <EditText android:hint="content" 
    	android:id="@+id/EditText01"  
        android:layout_width="fill_parent"  
        android:layout_height="wrap_content">  
    </EditText>  
    <Button 
    	android:text="send" 
    	android:id="@+id/Button02"  
        android:layout_width="fill_parent"  
        android:layout_height="wrap_content">  
    </Button>  
</LinearLayout> 


AndroidManifest.xml:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.amaker.socket"
      android:versionCode="1"
      android:versionName="1.0">
    <uses-sdk android:minSdkVersion="10" />

    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".SocketDemo"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
    <!-- 记得添加访问网络权限 -->
    <uses-permission android:name="android.permission.INTERNET"></uses-permission> 
</manifest>

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