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&quot;
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&quot;
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