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；

 

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

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

out.println(message);

 

（4）关闭打开的流

out.close();

完整工程代码如下：

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

<?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

<?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

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