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=newSocket("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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PrintWriterout=newPrintWriter(newBufferedWriter(newOutputStreamWriter(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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packagecom.yarin.android.Examples_08_04;
importjava.io.BufferedReader;
importjava.io.BufferedWriter;
importjava.io.InputStreamReader;
importjava.io.OutputStreamWriter;
importjava.io.PrintWriter;
importjava.net.Socket;
importandroid.app.Activity;
importandroid.os.Bundle;
importandroid.util.Log;
importandroid.view.View;
importandroid.view.View.OnClickListener;
importandroid.widget.Button;
importandroid.widget.EditText;
importandroid.widget.TextView;
publicclassActivity01extendsActivity
{
privatefinalStringDEBUG_TAG="Activity01";
privateTextViewmTextView=null;
privateEditTextmEditText=null;
privateButtonmButton=null;
/**Calledwhentheactivityisfirstcreated.*/
@Override
publicvoidonCreate(BundlesavedInstanceState)
{
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(newOnClickListener()
{
publicvoidonClick(Viewv)
{
Socketsocket=null;
Stringmessage=mEditText.getText().toString()+"/r/n";
try
{
//创建Socket
//socket=newSocket("192.168.1.110",54321);
socket=newSocket("10.14.114.127",54321);//IP：10.14.114.127，端口54321
//向服务器发送消息
PrintWriterout=newPrintWriter(newBufferedWriter(newOutputStreamWriter(socket.getOutputStream())),true);
out.println(message);
//接收来自服务器的消息
BufferedReaderbr=newBufferedReader(newInputStreamReader(socket.getInputStream()));
Stringmsg=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(Exceptione)
{
//TODO:handleexception
Log.e(DEBUG_TAG,e.toString());
}
}
});
}
}

布局文件main.xml

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<?xmlversion="1.0"encoding="utf-8"?>
<LinearLayoutxmlns: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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<?xmlversion="1.0"encoding="utf-8"?>
<manifestxmlns:android="http://schemas.android.com/apk/res/android"
package="com.yarin.android.Examples_08_04"
android:versionCode="1"
android:versionName="1.0">
<applicationandroid:icon="@drawable/icon"android:label="@string/app_name">
<activityandroid:name=".Activity01"
android:label="@string/app_name">
<intent-filter>
<actionandroid:name="android.intent.action.MAIN"/>
<categoryandroid:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
</application>
<uses-permissionandroid:name="android.permission.INTERNET"></uses-permission>
<uses-sdkandroid:minSdkVersion="5"/>
</manifest>

当然，还有服务器端得代码

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packagecom.yarin.android.Examples_08_04;
importjava.io.BufferedReader;
importjava.io.BufferedWriter;
importjava.io.InputStreamReader;
importjava.io.OutputStreamWriter;
importjava.io.PrintWriter;
importjava.net.ServerSocket;
importjava.net.Socket;
publicclassServerimplementsRunnable
{
publicvoidrun()
{
try
{
//创建ServerSocket
ServerSocketserverSocket=newServerSocket(54321);
while(true)
{
//接受客户端请求
Socketclient=serverSocket.accept();
System.out.println("accept");
try
{
//接收客户端消息
BufferedReaderin=newBufferedReader(newInputStreamReader(client.getInputStream()));
Stringstr=in.readLine();
System.out.println("read:"+str);
//向服务器发送消息
PrintWriterout=newPrintWriter(newBufferedWriter(newOutputStreamWriter(client.getOutputStream())),true);
out.println("servermessage");
//关闭流
out.close();
in.close();
}
catch(Exceptione)
{
System.out.println(e.getMessage());
e.printStackTrace();
}
finally
{
//关闭
client.close();
System.out.println("close");
}
}
}
catch(Exceptione)
{
System.out.println(e.getMessage());
}
}
//main函数，开启服务器
publicstaticvoidmain(Stringa[])
{
ThreaddesktopServerThread=newThread(newServer());
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

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