android socket通訊（下）

android socket通訊（下）

在android socket通訊（上），我們完成了一個模擬器上啟動並執行android socket通訊執行個體程式：

http://blog.csdn.net/htttw/article/details/7574372

今天我們將它移植到真實的android手機上，不過要先確保環境配置正確，請參考上一講。

主機的lwan0的ip地址是路由器自動分配的：192.168.1.100，android手機的ip地址是路由器自動分配的：192.168.1.101，可以在主機上ping手機，理論上是通的，不過很奇怪，我經常會碰到ping不通的情況，然後我在android手機裡裝了一個類比終端，ping主機，一般都是通的，難道是android手機的問題？

下面直接上代碼，和上一講的代碼基本沒有差別，改動的部分如下：

1.

ip地址修改過了

2.

連接埠由9400改為了9500（呵呵，這是任意的，不改也可以的）

2.

src/RealclientActivity.java

package real.client.com;import java.io.IOException;import java.io.PrintStream;import java.net.Socket;import java.net.UnknownHostException;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.Toast;public class RealclientActivity extends Activity{  /* 伺服器位址 */  private final String SERVER_HOST_IP = "192.168.1.100";  /* 伺服器連接埠 */  private final int SERVER_HOST_PORT = 9500;    private Button btnConnect;  private Button btnSend;  private EditText editSend;  private Socket socket;  private PrintStream output;  public void toastText(String message)  {    Toast.makeText(this, message, Toast.LENGTH_LONG).show();  }  public void handleException(Exception e, String prefix)  {    e.printStackTrace();    toastText(prefix + e.toString());  }  /** Called when the activity is first created. */  @Override  public void onCreate(Bundle savedInstanceState)  {    super.onCreate(savedInstanceState);    setContentView(R.layout.main);    initView();    btnConnect.setOnClickListener(new Button.OnClickListener()    {      @Override      public void onClick(View v)      {        initClientSocket();      }    });        btnSend.setOnClickListener(new Button.OnClickListener()    {      @Override      public void onClick(View v)      {        sendMessage(editSend.getText().toString());      }    });  }    public void initView()  {    btnConnect = (Button)findViewById(R.id.btnConnect);    btnSend = (Button)findViewById(R.id.btnSend);    editSend = (EditText)findViewById(R.id.sendMsg);    btnSend.setEnabled(false);    editSend.setEnabled(false);  }  public void closeSocket()  {    try    {      output.close();      socket.close();}    catch (IOException e)    {      handleException(e, "close exception: ");}  }    private void initClientSocket()  {    try    {      /* 串連伺服器 */      socket = new Socket(SERVER_HOST_IP, SERVER_HOST_PORT);      /* 擷取輸出資料流 */      output = new PrintStream(socket.getOutputStream(), true, "utf-8");            btnConnect.setEnabled(false);      editSend.setEnabled(true);      btnSend.setEnabled(true);    }    catch (UnknownHostException e)    {      handleException(e, "unknown host exception: " + e.toString());    }    catch (IOException e)    {      handleException(e, "io exception: " + e.toString());    }  }    private void sendMessage(String msg)  {    output.print(msg);  }}

layout/main.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <TextView        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="@string/hello" />    <Button        android:id="@+id/btnConnect"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="@string/connect" />    <EditText        android:id="@+id/sendMsg"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:inputType="text" />    <Button        android:id="@+id/btnSend"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="@string/send" /></LinearLayout>

不要忘了，在AndroidManifest.xml中添加訪問網路許可權：
<uses-permission android:name="android.permission.INTERNET" />

把上面的代碼編譯並下載到手機中

3.

伺服器端的代碼，用c++實現：

server.c

#include <sys/types.h>#include <sys/socket.h>#include <netinet/in.h>#include <arpa/inet.h>#include <unistd.h>#include <stdlib.h>#include <stdio.h>#define PORT 9500#define MAX_BUFFER 1024int main(){  /* create a socket */  int server_sockfd = socket(AF_INET, SOCK_STREAM, 0);    struct sockaddr_in server_addr;  server_addr.sin_family = AF_INET;  server_addr.sin_addr.s_addr = inet_addr("192.168.1.100");  server_addr.sin_port = htons(PORT);    /* bind with the local file */  bind(server_sockfd, (struct sockaddr *)&server_addr, sizeof(server_addr));    /* listen */  listen(server_sockfd, 5);    int size;  char buffer[MAX_BUFFER + 1];  int client_sockfd;  struct sockaddr_in client_addr;  socklen_t len = sizeof(client_addr);    /* accept a connection */  printf("waiting connection...\n");  client_sockfd = accept(server_sockfd, (struct sockaddr *)&client_addr, &len);  printf("connection established!\n");      while(1)  {    printf("waiting message...\n");        /* exchange data */    size = read(client_sockfd, buffer, MAX_BUFFER);    buffer[size] = '\0';    printf("Got %d bytes: %s\n", size, buffer);  }  /* close the socket */  close(client_sockfd);        return 0;}

Makefile：

all: server.cgcc -g -Wall -o server server.cclean:rm -rf *.o server

4.
運行結果：

代碼不過多解釋了，注釋挺詳細的，有關pc機上的tcp通訊，可以參考：

http://blog.csdn.net/htttw/article/details/7519964

最後，我把這個伺服器和用戶端兩個程式都上傳上來，供大家下載：

http://download.csdn.net/detail/htttw/4307666