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:

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(){@Overridepublic void onClick(View v){initClientSocket();}});btnSend.setOnClickListener(new Button.OnClickListener(){@Overridepublic 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=""android:layout_width="fill_parent"android:layout_height="fill_parent"android:orientation="vertical" ><TextViewandroid:layout_width="fill_parent"android:layout_height="wrap_content"android:text="@string/hello" /><Buttonandroid:id="@+id/btnConnect"android:layout_width="fill_parent"android:layout_height="wrap_content"android:text="@string/connect" /><EditTextandroid:id="@+id/sendMsg"android:layout_width="match_parent"android:layout_height="wrap_content"android:inputType="text" /><Buttonandroid: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:

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:

版权声明:本文为博主原创文章,未经博主允许不得转载。

但我自信,我能点亮心烛,化解心灵的困惑。

android socket通信(下)

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