Android客户端通过socket与服务器通信

下面是一个demo,Android客户端通过socket与服务器通信。

由于Android里面可以完全使用java.io.*包和java.net.*包，那么，实际上，逻辑部分与J2SE没有区别。只是UI代码不一样。

Android客户端通过socket与服务器通信分为下面5步：

（1）通过IP地址和端口实例化Socket，请求连接服务器；



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socket = new Socket("10.14.114.127",54321); //IP：10.14.114.127，端口54321

（2）获取Socket流以进行读写，并把流包装进BufferWriter或者PrintWriter

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PrintWriter out = new PrintWriter( new BufferedWriter( new OutputStreamWriter(socket.getOutputStream())),true);

这里涉及了三个类：socket.getOutputStream得到socket的输出字节流，OutputStreamWriter是字节流向字符流转换的桥梁，BufferWriter是字符流，然后再包装进PrintWriter。

（3）对Socket进行读写

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out.println(message);



（4）关闭打开的流

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out.close();

完整工程代码如下：

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package com.yarin.android.Examples_08_04;



import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.InputStreamReader;

import java.io.OutputStreamWriter;

import java.io.PrintWriter;

import java.net.Socket;



import android.app.Activity;

import android.os.Bundle;

import android.util.Log;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;



public class Activity01 extends Activity

{

private final String DEBUG_TAG = "Activity01";



private TextView mTextView = null;

private EditText mEditText = null;

private Button mButton = null;

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState)

{

super.onCreate(savedInstanceState);

setContentView(R.layout.main);



mButton = (Button)findViewById(R.id.Button01);

mTextView = (TextView)findViewById(R.id.TextView01);

mEditText = (EditText)findViewById(R.id.EditText01);



//登陆

mButton.setOnClickListener(new OnClickListener()

{

public void onClick(View v)

{

Socket socket = null;

String message = mEditText.getText().toString() + "/r/n";

try

{

//创建Socket

// socket = new Socket("192.168.1.110",54321);

socket = new Socket("10.14.114.127",54321); //IP：10.14.114.127，端口54321

//向服务器发送消息

PrintWriter out = new PrintWriter( new BufferedWriter( new OutputStreamWriter(socket.getOutputStream())),true);

out.println(message);



//接收来自服务器的消息

BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));

String msg = br.readLine();



if ( msg != null )

{

mTextView.setText(msg);

}

else

{

mTextView.setText("数据错误!");

}

//关闭流

out.close();

br.close();

//关闭Socket

socket.close();

}

catch (Exception e)

{

// TODO: handle exception

Log.e(DEBUG_TAG, e.toString());

}

}

});

}

}

布局文件main.xml

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<?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/TextView01"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="这里显示接收到服务器发来的信息"

/>

<EditText

android:id="@+id/EditText01"

android:text="输入要发送的内容"

android:layout_width="fill_parent"

android:layout_height="wrap_content">

</EditText>

<Button

android:id="@+id/Button01"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="发送"

/>

</LinearLayout>

AndroidManifest.xml文件如下

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<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

package="com.yarin.android.Examples_08_04"

android:versionCode="1"

android:versionName="1.0">

<application android:icon="@drawable/icon" android:label="@string/app_name">

<activity android:name=".Activity01"

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-permission>

<uses-sdk android:minSdkVersion="5" />

</manifest>

当然，还有服务器端得代码

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package com.yarin.android.Examples_08_04;



import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.InputStreamReader;

import java.io.OutputStreamWriter;

import java.io.PrintWriter;

import java.net.ServerSocket;

import java.net.Socket;



public class Server implements Runnable

{

public void run()

{

try

{

//创建ServerSocket

ServerSocket serverSocket = new ServerSocket(54321);

while (true)

{

//接受客户端请求

Socket client = serverSocket.accept();

System.out.println("accept");

try

{

//接收客户端消息

BufferedReader in = new BufferedReader(new InputStreamReader(client.getInputStream()));

String str = in.readLine();

System.out.println("read:" + str);

//向服务器发送消息

PrintWriter out = new PrintWriter( new BufferedWriter( new OutputStreamWriter(client.getOutputStream())),true);

out.println("server message");

//关闭流

out.close();

in.close();

}

catch (Exception e)

{

System.out.println(e.getMessage());

e.printStackTrace();

}

finally

{

//关闭

client.close();

System.out.println("close");

}

}

}

catch (Exception e)

{

System.out.println(e.getMessage());

}

}

//main函数，开启服务器

public static void main(String a[])

{

Thread desktopServerThread = new Thread(new Server());

desktopServerThread.start();

}

}

先开启服务器代码，

java Server即可

然后启动android模拟器。运行结果

这是Android客户端。输入12345，点击发送：







这是服务器端收到的消息