Android客户端通过socket与服务器进行通信可以分为以下几步:
应用程序与服务器通信可以采用两种模式:TCP可靠通信和UDP不可靠通信。
(1)通过IP地址和端口实例化Socket,请求连接服务器:
Java代码
- socket = new Socket(HOST, PORT); //host:为服务器的IP地址 port:为服务器的端口号
(2)获取Socket流以进行读写,并把流包装进BufferWriter或者PrintWriter:
Java代码
- PrintWriter out = new PrintWriter( new BufferedWriter( new OutputStreamWriter(socket.getOutputStream())),true);
这里涉及了三个类:socket.getOutputStream得到socket的输出字节流,OutputStreamWriter是字节流向字符流转换的桥梁,BufferWriter是字符流,然后再包装进PrintWriter。
(3)对Socket进行读写
Java代码
- if (socket.isConnected()) {
- if (!socket.isOutputShutdown()) {
- out.println(msg);
- }
- }
(4)关闭打开的流
Java代码
- out.close();
在写代码的过程中一定要注意对socket 输入流 、输出流的关闭。
下面是一个简单的例子:
main.xml:
XML/HTML代码
- <?xml version="1.0" encoding="utf-8"?>
- <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
- android:orientation="vertical"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent">
- <TextView
- android:id="@+id/TextView"
- android:singleLine="false"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content" />
- <EditText android:hint="content"
- android:id="@+id/EditText01"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content">
- </EditText>
- <Button
- android:text="send"
- android:id="@+id/Button02"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content">
- </Button>
- </LinearLayout>
下面是android客户端的源代码:
Java代码
- package com.android.SocketDemo;
- 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.Socket;
- 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.view.View;
- import android.widget.Button;
- import android.widget.EditText;
- import android.widget.TextView;
- public class SocketDemo 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 = "192.168.1.223";
- private static final int PORT = 9999;
- private Socket socket = null;
- private BufferedReader in = null;
- private PrintWriter out = null;
- private String content = "";
- /** 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.Button02);
- try {
- socket = new Socket(HOST, PORT);
- in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
- out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(
- socket.getOutputStream())), true);
- } catch (IOException ex) {
- ex.printStackTrace();
- 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()) {
- out.println(msg);
- }
- }
- }
- });
- new Thread(SocketDemo.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) {
- // TODO Auto-generated method stub
- }
- }).show();
- }
- public void run() {
- 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);
- }
- };
- }
下面是服务器端得java代码:
Java代码
- 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;
- public class Main {
- private static final int PORT = 9999;
- private List<Socket> mList = new ArrayList<Socket>();
- private ServerSocket server = null;
- private ExecutorService mExecutorService = null; //thread pool
- 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()));
- 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 {
- 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())),true);
- pout.println(msg);
- }catch (IOException e) {
- e.printStackTrace();
- }
- }
- }
- }
- }
注意在AndroidManifest.xml中加入对网络的访问权限:
XML/HTML代码
- <uses-permission android:name="android.permission.INTERNET"></uses-permission>
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