Android(安卓)socket通信

（一）服务器端
TCPDesktopServer.java

import java.io.BufferedReader;import java.io.InputStreamReader;import java.net.ServerSocket;import java.net.Socket;public class TCPDesktopServer implements Runnable{    public static final String SERVERIP = "127.0.0.1";    public static final int SERVERPORT = 1818;    public void run() {         try {             System.out.println("S: Connecting...");             ServerSocket serverSocket = new ServerSocket(SERVERPORT);             while (true) {                  Socket client = serverSocket.accept();                  System.out.println("S: Receiving...");                  try {                      BufferedReader in = new BufferedReader(new InputStreamReader(client.getInputStream()));                      String str = in.readLine();                      System.out.println("S: Received: '" + str + "'");                    } catch(Exception e) {                        System.out.println("S: Error");                        e.printStackTrace();                    } finally {                        client.close();                        System.out.println("S: Done.");                    }             }          } catch (Exception e) {             System.out.println("S: Error");             e.printStackTrace();         }    }    public static void main (String a[]) {        Thread desktopServerThread = new Thread(new TCPDesktopServer());        desktopServerThread.start();    }}

对上边的源代码做一些介绍：
指定Server监听的端口和服务器IP地址。
public static final String SERVERIP = "127.0.0.1";
public static final int SERVERPORT = 1818;
应用之前所指定的IP和Port创建一个ServerSocket对象。
ServerSocket serverSocket = new ServerSocket(SERVERPORT);
用于侦听和捕捉通过Socket连接的客户端。
Socket client = serverSocket.accept();
应用Socket创建BufferedReader对象,用于接收Socket Stream中的数据。
BufferedReader in = new BufferedReader(new InputStreamReader(client.getInputStream()));

（二）客户端

main.java

import java.io.*;import java.net.Socket;import java.net.UnknownHostException;import android.app.Activity;import android.os.Bundle;import android.text.TextUtils;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.Toast;public class main extends Activity implements OnClickListener{    /** Called when the activity is first created. *///定义声明需要用到的UI元素private EditText edtmsgcontent;private Button btnSend;private String ip="169.254.191.14";private int port=1818;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        //setContentView(R.layout.main);        InitView();    }    private void InitView()    {    //显示主界面    setContentView(R.layout.main);    //通过id获取ui元素对象    edtmsgcontent=(EditText)findViewById(R.id.msgcontent);    btnSend=(Button)findViewById(R.id.btnsend);    //为btnsend设置点击事件    btnSend.setOnClickListener(this);    }        public void onClick(View bt)    {    try {String msg=edtmsgcontent.getText().toString();if(!TextUtils.isEmpty(msg))SendMsg(ip,port,msg);else{Toast.makeText(this,"请先输入要发送的内容", Toast.LENGTH_LONG);edtmsgcontent.requestFocus();}} catch (Exception e) {e.printStackTrace(); } }    public void SendMsg(String ip,int port,String msg) throws UnknownHostException, IOException    {    try    {    Socket socket=null;    socket=new Socket(ip,port);    BufferedWriter writer=new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));    writer.write(msg);    writer.flush();    writer.close();    socket.close();    }    catch(UnknownHostException e)    {    e.printStackTrace();    } catch (IOException e)     {        e.printStackTrace();        }    }}

对上边的源代码做一些介绍：
应用Server的IP和端口建立Socket对象。
Socket socket = new Socket(ip, port);
根据已经建立的Socket来创建PrintWriter，将信息通过这个对象来发送给Server，其中包含了三个部分：
OutputStreamWriter
BufferedWriter
PrintWriter
PrintWriter out = new PrintWriter( new BufferedWriter( new OutputStreamWriter(socket.getOutputStream())),true);

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"      package="com.socket.client"      android:versionCode="1"      android:versionName="1.0">    <uses-sdk android:minSdkVersion="7" />    <application android:icon="@drawable/icon" android:label="@string/app_name">        <activity android:name=".main"                  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>    <uses-permission android:name="android.permission.INTERNET" />    <uses-sdk android:minSdkVersion="7"></uses-sdk></manifest>

main.xml

<?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:layout_width="fill_parent"     android:layout_height="wrap_content"     android:text="@string/hello"    /><EditText android:text="EditText" android:layout_height="wrap_content" android:layout_width="fill_parent" android:id="@+id/msgcontent"></EditText><Button android:layout_height="wrap_content" android:text="@string/Send" android:layout_width="fill_parent" android:id="@+id/btnsend"></Button></LinearLayout>

strings.xml

<?xml version="1.0" encoding="utf-8"?><resources>    <string name="hello">Socket Client!</string>    <string name="app_name">Socket</string>    <string name="Send">发送</string></resources>

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