虚幻引擎UE4材质节点初级探究视频教程
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socket是网络上的两个程序通过一个双向的通信连接实现数据的交换，这个连接的一端称为一个socket。socket通常也称作"套接字"，用于描述IP地址和端口，是一个通信链的句柄，可以用来实现不同虚拟机或不同计算机之间的通信。在Internet上的主机一般运行了多个服务软件，同时提供几种服务。
客户软件将插头插到不同编号的插座，就可以得到不同的服务最重要的是，Socket是面向客户/服务器模型而设计的，针对客户和服务器程序提供不同的Socket系统调用。客户随机申请一个Socket，系统为之分配一个Socket号;服务器拥有全局公认的Socket，任何客户都可以向它发出连接请求和信息请求。Socket利用客户/服务器模式巧妙地解决了进程之间建立通信连接的问题。服务器Socket半相关为全局所公认非常重要。
目前想让手机客户端和服务器保持长连接故选择socket进行通信
首先是新建一个socket服务器端
package com.wpndemo.socket;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
/**
* TODO
* @author cuiran
* @version TODO
*/
public class Main {
private static final int PORT = 8090;
private List mList = new ArrayList();
private ServerSocket server = null;
private ExecutorService mExecutorService = null; //thread pool
public static final String bm="utf-8"; //全局定义，以适应系统其他部分
public static void main(String[] args) {
new Main();
}
public Main() {
try {
server = new ServerSocket(PORT);
mExecutorService = Executors.newCachedThreadPool(); //create a thread pool
System.out.print("server start ...");
Socket client = null;
while(true) {
client = server.accept();
mList.add(client);
mExecutorService.execute(new Service(client)); //start a new thread to handle the connection
}
}catch (Exception e) {
e.printStackTrace();
}
}
class Service implements Runnable {
private Socket socket;
private BufferedReader in = null;
private String msg = "";
public Service(Socket socket) {
this.socket = socket;
try {
in = new BufferedReader(new InputStreamReader(socket.getInputStream(),bm));
msg = "user" +this.socket.getInetAddress() + "come toal:"
+mList.size();
this.sendmsg();
} catch (IOException e) {
e.printStackTrace();
}
}
@Override
public void run() {
// TODO Auto-generated method stub
try {
while(true) {
if((msg = in.readLine())!= null) {
if(msg.equals("exit")) {
System.out.println("ssssssss");
mList.remove(socket);
in.close();
msg = "user:" + socket.getInetAddress()
+ "exit total:" + mList.size();
socket.close();
this.sendmsg();
break;
} else {
System.out.println("msg="+msg);
msg = socket.getInetAddress() + ":" + msg;
this.sendmsg();
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
public void sendmsg() {
System.out.println(msg);
int num =mList.size();
for (int index = 0; index < num; index ++) {
Socket mSocket = mList.get(index);
PrintWriter pout = null;
try {
pout = new PrintWriter(new BufferedWriter(
new OutputStreamWriter(mSocket.getOutputStream(),bm)),true);
pout.println(msg);
}catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
然后是新建一个Android工程：
在文件【AndroidManifest.XML】添加内容：
然后是创建类：
package com.cayden.socket;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.net.Socket;
import com.cayden.util.Conf;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class SocketActivity extends Activity implements Runnable {
private TextView tv_msg = null;
private EditText ed_msg = null;
private Button btn_send = null;
// private Button btn_login = null;
private static final String HOST = "219.143.49.189";
private static final int PORT = 8403;
private Socket socket = null;
private BufferedReader in = null;
private PrintWriter out = null;
private String content = "";
public static final String bm="utf-8"; //全局定义，以适应系统其他部分
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
tv_msg = (TextView) findViewById(R.id.TextView);
ed_msg = (EditText) findViewById(R.id.EditText01);
// btn_login = (Button) findViewById(R.id.Button01);
btn_send = (Button) findViewById(R.id.sendBtn);
try {
socket = new Socket(HOST, PORT);
in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(
socket.getOutputStream(),bm)), true);
Log.i(Conf.TAG, "连接成功");
} catch (IOException ex) {
ex.printStackTrace();
Log.i(Conf.TAG, "出现异常："+ex.getMessage());
ShowDialog("login exception" + ex.getMessage());
}
btn_send.setOnClickListener(new Button.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
String msg = ed_msg.getText().toString();
if (socket.isConnected()) {
if (!socket.isOutputShutdown()) {
try {
out.println(msg);
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
});
new Thread(SocketActivity.this).start();
}
public void ShowDialog(String msg) {
new AlertDialog.Builder(this).setTitle("notification").setMessage(msg)
.setPositiveButton("ok", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
}
}).show();
}
@Override
public void run() {
// TODO Auto-generated method stub
try {
while (true) {
if (socket.isConnected()) {
if (!socket.isInputShutdown()) {
if ((content = in.readLine()) != null) {
content += "\n";
mHandler.sendMessage(mHandler.obtainMessage());
} else {
}
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
public Handler mHandler = new Handler() {
public void handleMessage(Message msg) {
super.handleMessage(msg);
tv_msg.setText(tv_msg.getText().toString() + content);
}
};
}
通过上文可以知道要实现手机客户端和服务器保持长连接需要选择socket通信，整个流程下来首先要做的是新建一个socket服务器端，再新建一个android工程，最后创建一个类。在后续中会增加采用mina框架来实现通信。
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