Socket通信：Linux服务器与多个Android客户端
Socket通信：Linux服务器与多个Android客户端
1. Linux Server:
#include //for fork and read
#include //for socket
#include //for socket
#include // for bzero
#includeint rval;
char buf[MAXSIZE];
if ((rval = read(client_fd, buf, MAXSIZE)) < 0) {
cout << "Reading stream error!\n";
continue;
}
cout << "用户发送的信息为：" << buf << endl;
//-----发送消息
const char *msg = "67.8元";
if (send(client_fd, const_cast<char *>(msg), strlen(msg), 0) == -1)
cerr << "send error!" << endl;
}
}
}
close(client_fd);
// exit(0);
}
void server()
{
// 参数设置
const unsigned short SERVERPORT = 53553;
const int BACKLOG = 10; //10 个最大的连接数
const int MAXSIZE = 1024;
int sock, client_fd;
sockaddr_in myAddr;
sockaddr_in remoteAddr;
sock = socket(AF_INET, SOCK_STREAM, 0);
//create socket
if( sock == -1)
{
cerr<<"socket create fail!"<exit(1);
}
cout<<"sock :"<// bind
myAddr.sin_family = AF_INET;
myAddr.sin_port = htons(SERVERPORT);
myAddr.sin_addr.s_addr = INADDR_ANY;
bzero( &(myAddr.sin_zero), 8);
if(bind(sock, (sockaddr*)(&myAddr), sizeof(sockaddr)) ==-1 )
{
cerr<<"bind error!"<exit(1);
}
// 服务器ip和端口
cout << " server ip: " << inet_ntoa(myAddr.sin_addr) << endl;
cout << " server port: " << SERVERPORT <//myAddr.sin_port
//listen
if(listen(sock, BACKLOG) == -1)
{
cerr<<"listen error"<exit(1);
}
// 创建多个线程连接用户端
pthread_t tids[BACKLOG];
int threadID = 0;
while(threadID<10) {
unsigned int sin_size = sizeof(sockaddr_in);
data threadParam;
threadParam.server_fd = sock;
threadParam.sin_size = sin_size;
int ret = pthread_create(&tids[threadID],NULL,acceptClient,(void *)&threadParam);
threadID++;
if (ret != 0)
{
cout << "pthread_create error: error_code=" << ret << endl;
}
} 2. Android 客户端
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.Socket;
public class MainActivity extends AppCompatActivity {
private TextView editText_1;
private EditText editText_ip,editText_data;
private OutputStream outputStream = null;
private Socket socket = null;
private String ip;
private String data;
private boolean socketStatus = false;
StringBuffer stringBuffer = new StringBuffer();
private String textToShow = "待支付金额：";
public Handler handler = new Handler(){
@Override
public void handleMessage(Message msg) {
switch (msg.what){
case 1:
textToShow+="\n";
textToShow+=msg.obj.toString();
editText_1.setText(textToShow);
break;
case 2:
editText_1.setText(msg.obj.toString());
stringBuffer.setLength(0);
break;
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
editText_ip = (EditText) findViewById(R.id.et_ip);
editText_data = (EditText) findViewById(R.id.et_data);
editText_1 = (TextView) findViewById(R.id.text1);
}
public void connect(View view){
ip = editText_ip.getText().toString();
if(ip == null){
Toast.makeText(MainActivity.this,"please input Server IP",Toast.LENGTH_SHORT).show();
}
Thread thread = new Thread(){
@Override
public void run() {
super.run();
if (!socketStatus) {
try {
// ip 和端口要和服务器一致
socket = new Socket(ip,53553);
if(socket == null){
}else {
socketStatus = true;
}
outputStream = socket.getOutputStream();
} catch (IOException e) {
Toast.makeText(MainActivity.this,"socket connect failed",Toast.LENGTH_SHORT).show();
e.printStackTrace();
}
}
}
};
thread.start();
}
public void send(View view){
// 发送数据
data = editText_data.getText().toString();
if(data == null){
Toast.makeText(MainActivity.this,"please input Sending Data",Toast.LENGTH_SHORT).show();
}else {
//在后面加上 '\0' ,是为了在服务端方便我们去解析；
data = data + '\0';
}
Thread thread = new Thread(){
@Override
public void run() {
super.run();
if(socketStatus){
try {
outputStream.write(data.getBytes());
} catch (IOException e) {
e.printStackTrace();
}
}
//接受返回数据
int len;
byte[] bytes = new byte[20];
InputStream inputStream;
StringBuffer stringBuffer = new StringBuffer();
try{
inputStream = socket.getInputStream();
while ((len = inputStream.read(bytes)) != -1) {
for(int i=0; ichar)bytes[i]);
}
Message message = handler.obtainMessage();
message.what = 1;
message.obj = stringBuffer;
handler.sendMessage(message);
break;
}
} catch (Exception e){ }
}
};
thread.start();
}
/*当客户端界面返回时，关闭相应的socket资源*/
@Override
public void onBackPressed() {
super.onBackPressed();
/*关闭相应的资源*/
try {
outputStream.close();
socket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
} 权限：
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.INTERNET" />- 服务器端ip说明：ip = 0.0.0.0 可以本机和本机的端口间任意通信，在局域网中，要使用192.168.xxx.xxx的ip，保证客户端和服务器端口ip一致
最后，完整demo，以及Linux的客户端，Andoird的服务器端的下载链接：
http://download.csdn.net/download/burning_keyboard/10229385