android socket通信(下)
android socket通信(下)
在android socket通信(上),我们完成了一个模拟器上运行的android socket通信实例程序:
http://blog.csdn.net/htttw/article/details/7574372
今天我们将它移植到真实的android手机上,不过要先确保环境配置正确,请参考上一讲。
主机的lwan0的ip地址是路由器自动分配的:192.168.1.100,android手机的ip地址是路由器自动分配的:192.168.1.101,可以在主机上ping手机,理论上是通的,不过很奇怪,我经常会碰到ping不通的情况,然后我在android手机里装了一个模拟终端,ping主机,一般都是通的,难道是android手机的问题?
下面直接上代码,和上一讲的代码基本没有差别,改动的部分如下:
1.
ip地址修改过了
2.
端口由9400改为了9500(呵呵,这是任意的,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{ /* 服务器地址 */ private final String SERVER_HOST_IP = "192.168.1.100"; /* 服务器端口 */ 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 { /* 连接服务器 */ socket = new Socket(SERVER_HOST_IP, SERVER_HOST_PORT); /* 获取输出流 */ 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中添加访问网络权限:
<uses-permission android:name="android.permission.INTERNET" />
把上面的代码编译并下载到手机中
3.
服务器端的代码,用c++实现:
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.
运行结果:
代码不过多解释了,注释挺详细的,有关pc机上的tcp通信,可以参考:
http://blog.csdn.net/htttw/article/details/7519964
最后,我把这个服务器和客户端两个程序都上传上来,供大家下载:
http://download.csdn.net/detail/htttw/4307666
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